KR100872358B1 - Dehydration method and apparatus for centrifugal condensation high pressure rotary screw press for reducing industrial sludge moisture content - Google Patents

Abstract

A method and an apparatus of centrifugal concentration high pressure rotary type screw press two-process sludge dehydration are provided to reduce power consumption and reduce about 5% of the water content as compared with existing dehydration equipment. A method of centrifugal concentration high pressure rotary type screw press two-process dehydration comprises: a first step of flowing wastewater mixed with sludge in a rotor(4) in which a screw shaft(30) is installed; a second step of coagulating sludge in the wastewater flown-in in the first step toward an inner peripheral surface of the rotor to primarily separate sludge and water from the flown-in wastewater; a third step of concentrating sludge in sludge-coagulated wastewater by a rotating concentration screw to discharge the concentrated sludge to a space between the rotor and a wedge wire screen(5); a fourth step of pressing the concentrated sludge discharged in the third step by a rotating rotor to dehydrate the concentrated sludge by the wedge wire screen; and a fifth step of discharging sludge cake through a slide gate valve(6), and discharging water discharged to the wedge wire screen to a drainpipe.

Description

Dewatering method and apparatus for centrifugal condensation concentrated high pressure rotary screw press for reducing industrial sludge moisture content {.}

The present invention is a sludge dewatering device that minimizes the volume and weight of the sludge to be treated by removing most of the water from the sludge containing a large amount of water, the dehydration cake is fixed to the inside of the wedge wire screen during the sludge treatment process It is possible to prevent the risk of failure, and to reduce the power required for the dehydration treatment while reducing the industrial sludge moisture content to further improve the dewatering efficiency centrifugal concentrated high-pressure rotary screw press dehydration method and To the device.

In general, high-performance sludge cakes with an average water content of 75% are generated during industrial and sewage treatment. Sludge cakes are mostly disposed of by landfilling or dumping at sea, causing serious environmental problems.
In recent years, as an effort to prevent environmental pollution, marine disposal of sludge is banned, so treatment methods such as incineration are required, and the dewatering process of sludge can reduce waste and incinerate in the pretreatment stage of waste treatment. It is recognized as an important process.
As an example of industrial sludge, the papermaking process for manufacturing paper of lipids suitable for the purpose through various mechanical and chemical treatments with pulp as its main raw material is divided into composition process, papermaking process, and coating process. And the packaging process is completed, wherein the composition step is to dissociate the pulp which is the main raw material of the paper in water to release the pulp fibers to fall off and then add water to the pulp fibers until the appropriate level is reached, and then the size agent, It is the most important process that influences the quality of paper by mixing fillers, retention enhancers, and other additives while stirring, and then selecting the process of paper, which inevitably generates a large amount of paper sludge.

In addition, used paper waste paper, cardboard waste paper, advertisement paper, posters, etc. are used as raw materials of recycled pulp to recycle resources.Paper weapons such as calcium carbonate, talc, fillers, and pigments on paper surfaces made of pulp fibers Chemicals are applied to give smoothness and printability.

The paper-making inorganic chemicals are left after recovering pulp fibers from waste paper to become paper sludge. These paper sludges are industrial wastes containing pulp short fibers or ink components, and are incinerated or disposed of in boilers or incinerators.

Since such industrial sludge including paper sludge contains a large amount of water, it is inefficient to transport wastewater directly. Incineration is difficult at all, and the sludge is separated from the wastewater and extracted in the form of solids so as to have a proper water content. Incineration and landfill treatment, where the first extraction of sludge and water from the wastewater can be installed by eliminating or reducing the sludge treatment process sedimentation tank, digestion tank, dehydration process, auxiliary equipment. In this way, the extraction of sludge and water from the wastewater is generally performed by compression and centrifugal dehydration.

In the case of compression dehydration, a device is known in which a pressurized header reciprocated by an actuator inside a screen has a structure in which a screw for compressing or rotating a screw is compressed and dewatered and transported.

The compression dewatering method by the reciprocating pressurized header is superior in the dewatering efficiency compared with the screw method or the centrifugal dewatering method, and the screw method is effective in terms of delaying sludge backflow.

Specifically, belt presses, screw centrifuges, and filter presses are used as large-capacity dehydrators currently used in sewage treatment plants.
In the case of the paper sludge dewatering device, the belt press is a dehydrator which is most commonly used, and has a dehydration moisture content of 65 to 75%, low dehydration efficiency, and an open structure, resulting in a bad smell.
The screw centrifugal dehydrator is a special equipment that is relatively expensive. When dewatering sewage sludge, the water content is 75 ~ 80%, which limits the moisture content of dewatered cakes. Of course, there is a problem that the maintenance is difficult due to severe wear.
The filter press is used for a special purpose of treating small amount of sediment, and the dehydration moisture content is 50 to 55%, the filter replacement cost is expensive, and there is a problem that a large amount of automatic processing is impossible.
In terms of performance of dehydration method, the method of dehydration at high pressure while compressing into cylinder in micro screen or filter is excellent, but the technology to continuously flow each process such as compressed dewatering, discharge and cleaning is not developed. Only used in small capacity dehydrators such as
Therefore, if a compressed dehydrator consisting of condensation / high pressure dewatering / discharging / cleaning a large amount of sludge is developed, the dehydrating cake of 70% of the water content can be changed to the dehydrating cake of 60%. Therefore, the amount of sludge waste generated is reduced by almost 25%, which can reduce not only the logistics cost but also the disposal cost and the damage of environmental pollution.
In particular, sludge cakes with a water content of 60% can be used as an organic recycling resource in themselves, which has the importance of reducing sludge disposal costs and sludge recycling.
In the treatment of sludge, the physical properties and properties of sludge vary from site to site, so it is important to select a flocculant such as polymer suitable for the sludge, and the dehydration method must be customized according to the characteristics of the sludge. Reduction depends on dehydration efficiency.
A general sludge dewatering device using a pressurized header and a screw method has been reported in Korean Utility Model Registration 20-320813. The sludge dewatering device is operated in a central axial direction while a wedge wire screen is installed in a screen housing having a drainage port, and an inlet pipe through which sludge is introduced and an outlet through which dewatered cake is discharged are formed at both ends of the wedge wire screen. A screw rotor driven by a cylinder is installed, and a discharge valve that is opened and closed by another cylinder is installed at an outlet, and a dewatering cake is present in a gap generated between the screw rotor and the wedge wire screen. Since there is no means for removing the dewatered cake that is in close contact with the inner diameter of the screen, a problem occurs that the dewatered sludge cake closes the screen.

In order to solve such a problem, Korean Patent No. 10-702670 'Sludge Dewatering Device' is known.

The apparatus is shown in FIG. Referring to this drawing, a rear plate 101 and a main shaft 105 penetrating through the center plate 102 and the front plate 103 are installed on the frame 100, and the rear plate 101 and the center are installed. The dewatering part 107 and the drainage part 108 in which the wedge wire screen 106 is installed are installed in the space formed by the plate 102, and are formed by the center plate 102 and the rear plate 103. In forming the sludge dewatering device in which the discharge part 110 including the slide valve 109 for discharging the sludge cake dehydrated in the space is formed, it is fixed to the drive shaft of the motor 112 having the speed reducer and moves in the axial direction. And the main shaft moving cylinder 115 is fixed to the slide bracket 114 guided by the guide post 113 fixed to the rear plate 101 on the main shaft 105 rotatably installed. The piston rod of the main shaft moving cylinder 115 is fixed to the front plate 103, the screw rotor 121 is fixed to a position close to the sludge cake outlet of the center plate 102, and the screw rotor 116 and Between the sludge inlet pipe 117 is a vane 119 is installed while receiving the elasticity of the spring 118 is to be fixed to the rotor 120 is formed with a step.

The sludge dewatering device may remove moisture from sludge containing a large amount of water by a compression dewatering method between the screw rotor 121 and the sludge inlet pipe 117, and the vane 119 formed on the rotor 120. It is effective in that the wedge wire screen 106 can be automatically cleaned to prevent the dewatered cake from which moisture is removed from sticking to the wedge wire screen 106.

In the sludge dehydration system, the dehydration efficiency for effectively dehydrating water from the sludge is most important, and for the effective dewatering efficiency, it is necessary to reduce the power required. From this point of view, the sludge dehydration device can reduce power. Is not up to expectations.

That is, because the relatively heavy chain rotor 120 and screw rotor 121 to rotate and at the same time to move in the axial direction with the reducer, the required power is increased. In addition, when the maintenance work such as replacement of the rotor 120 or the need for internal cleaning, the frame (101, 102, 103) and the wedge wire screen 106 had to be disassembled, the operation was inconvenient.

In order to solve such a problem, the compression dehydration by the pressurized header and the dehydration method by the screw or the centrifugal dehydration method are appropriately harmonized to compensate for the disadvantages of each dehydration method. In order to make the best use of the advantages, Korean Patent No. 10-726986 "Paper Sludge Dewatering Device", which is devised by the applicant of the present application, is known.

The apparatus is shown in FIG. Referring to this figure, the rotor 25 is fixed to the main shaft 4 which is rotatably installed horizontally on the upper part of the frame 1, so as to drive the main shaft 4 of the rotor rotation motor 5. As the power is rotated and the wedge wire screen 26 is installed outside the rotor 25 to dewater the sludge, and the slide gate valve 27 opened and closed at one side of the wedge wire screen 26 is opened. In the sludge dewatering device in which the dewatered sludge is discharged, one end is connected to a rotary joint 11 to which paper sludge is supplied, and the other end is a sludge supply pipe 3 having a paper sludge discharge hole 12 formed therein. ; A main shaft 4 having one end connected to the sludge supply pipe 3 and the other end being fixed to the rotor 25 and driven by a rotor rotation motor 5; A rotor 25 fixed to the main shaft at a position proximate to the paper sludge discharge hole 12 of the sludge supply pipe 3; A wedge wire screen (26) which is slidably placed on the main shaft (4) while receiving the paper sludge discharge hole (12) of the sludge supply pipe (3) in the inner space outside the rotor (25); Moving means for moving the wedge wire screen 26 in the axial direction of the main shaft 4; And a wedge wire screen 26 reciprocates outside the rotor 25 which rotates in a predetermined position with a limit switch assembly for limiting the movement range of the wedge wire screen 26 reciprocating by the moving means. Paper sludge is introduced and dewatered and discharged.

In the paper sludge dewatering apparatus, the compression dehydration method by the pressurized header, the centrifugal dehydration method, and the dehydration and transfer method by the screw are appropriately harmonized, so that the advantages and disadvantages of each method are appropriately harmonized to maximize the dewatering efficiency and the relative weight. The rotary drive of the chain rotor is fixed, and by reducing the wedge wire screen, which is a relatively lightweight body, by reciprocating in the axial direction, thereby reducing the transportation cost and the incineration cost of waste disposal, and the wedge wire screen is reciprocated. The maximum stroke is longer than the length of the rotor so that the rotor can be exposed. During maintenance, the wedge wire screen can be divided to maintain the rotor, which can reduce the power required for processing and paper and other sludge. It is possible to provide a dehydration device.

However, the wedge wire screen 26 is moved in the axial direction of the main shaft 4 by the wedge wire screen moving cylinder, and the maximum stroke through which the wedge wire screen reciprocates is longer than the length of the rotor so that the rotor can be exposed. The configuration requires a lot of space for driving the device, and has the drawback that the required power is increased.

In general, the centrifugal dehydrator can concentrate the sludge water content to 85% or less. At this time, the sludge throughput is reduced by 50% or more, so that the same effect as the existing dehydrator capacity is increased by 40% or more.
As described above, the centrifugal concentrated dewatering device has a limit of lowering the water content as the water content of the sludge becomes about 80%, and by rotating at a high speed of about 3000 rpm, the noise is high and the wear between parts is promoted, so that the mechanical life is short and the required power is increased. Increased, there is a problem that the structure is complicated due to the valve installed to adjust the discharge pressure in the outlet.

If the method of conveying high pressure compression dehydration and conveying by pressurized header and screw is properly harmonized, it maximizes dehydration efficiency and can reduce the water content by more than 20% while reducing the water content by more than 10% compared to the existing dehydration device. The energy of the input heat source can be saved.
Therefore, the present invention effectively reduces the water content of the sludge by separating a large amount of water and sludge from the wastewater containing the sludge by a two-step centrifugal concentrated dewatering method and then discharge the sludge cake in the solid state by a mechanical dehydration method. By driving at a medium speed than conventional devices, the required power can be reduced by about 30%, and the centrifugal concentrated high-pressure rotary screw press two-step sludge dewatering method that can reduce the water content by about 5% compared to the existing dewatering equipment and can be realized. It is intended to provide a device that can.

Another object of the present invention is a structure in which the wedge wire screen itself is rotatable at high speed, unlike the conventional apparatus in which the wedge wire screen is reciprocated for dehydration, and the wedge wire screen and the rotor are relatively rotated at low speed. The present invention provides a device capable of realizing a centrifugal concentrated high pressure rotary screw press two-stage sludge dewatering method, which has an advantage that the volume of the device is remarkably compact compared to other devices in comparison with the treatment capacity.

Centrifugal concentrated high-pressure rotary screw press two-step dewatering method of the present invention for achieving the above object is the first step of introducing the wastewater in which the sludge is mixed into the rotor installed with a rotating screw shaft through a rotating water supply pipe ;

A second step of firstly separating the sludge and water from the introduced wastewater by agglomerating the sludge in the wastewater toward the inner circumferential surface of the rotor by using the centrifugal force of the screw shaft to inject the wastewater introduced in the first step;

A third step of discharging the wastewater, which is agglomerated and separated in the second step, through a drain hole formed in the screw shaft, and condensing the sludge to the space between the rotor and the wedge wire screen by concentrating the sludge by the action of a rotating screw. step;

A fourth step of compressing the concentrated sludge discharged in the third step by a rotating rotor to dehydrate the wedge wire screen;

And a fifth step in which the sludge cake compressed and dewatered in the fourth step is discharged through the slide gate valve, and the water discharged to the wedge wire screen is discharged to the drain pipe.

In the second and third stages, the screw shaft, the rotor, and the wedge wire screen simultaneously rotate, aggregate, concentrate, and dehydrate. In the third stage, the rotation speed of the screw shaft is faster than the rotation speed of the rotor. The primary concentrated separated sludge can be concentrated and conveyed to the outlet, and the rotation speed of the wedge wire screen is faster than that of the rotor, resulting in rapid centrifugal dewatering.

Apparatus for realizing the paper sludge dewatering method by the two-stage concentrated dehydration of the present invention:

Base;

A frame installed on the base;

A screw shaft installed horizontally rotatably with a bearing in the frame;

A rotor accommodating a concentrated screw formed in the screw shaft;

A wedge wire screen through which the water which is centrifugally dehydrated is discharged while simultaneously rotating the screw shaft while receiving the rotor;

A slide gate valve installed on the outer circumferential surface of the rotor to have a gap adjusting means for adjusting an interval at which the sludge dehydrated by opening and closing at one side of the wedge wire screen is discharged;

Wastewater supply means for supplying wastewater containing sludge to the screw shaft;

Drive means for rotating the screw shaft, the rotor, and the wedge wire screen to centrifugally concentrate and dewater the wastewater supplied by the wastewater supply means;
And drainage means for discharging the concentrated and dehydrated wastewater.
The gap adjusting means includes an air cylinder; A bearing fixed to the piston rod of the air cylinder; A pushing plate to which the bearing is slidably fixed to the screw shaft while in rolling contact with one side; One end is fixed to the pushing plate and the other end is provided to the slide gate valve so that the slide gate valve can be moved axially when the pushing plate is pushed by the thrust bearing moving by the forward drive of the air cylinder. It is configured to include a fixed rod.
Waste water supply means for supplying the waste water containing the sludge to the screw shaft is a screw shaft for drilling the water supply hole to form a hollow shaft; And a water supply pipe through which a water supply hole coinciding with the water supply hole of the screw shaft is inserted into one end of the screw shaft, into which waste water mixed with sludge flows.
The drive means for rotating the screw shaft, the rotor, and the wedge wire screen so as to centrifugally concentrate dewatering the wastewater supplied by the wastewater supply means; A screw shaft to which the wedge wire screen is integrally fixed; A main shaft to which the screw shaft is fixed to rotate by the power of the motor; The main shaft is rotatably inserted and supported by a bearing on the base, and has a shaft support that rotates with the power of the motor to adjust the rotational speed of the rotor and the rotational speed of the concentrated screw and wedge wire screen.
The adjustment of the rotation speed of the motor for transmitting power to the rotor; A reducer for transmitting power of the motor to the main shaft; A first belt transmission mechanism connected to the motor output side pulley installed on the drive shaft of the motor and the main shaft input side pulley installed on the main shaft by a first transmission belt to transfer power of the motor to the main shaft; A second belt transmission mechanism configured to connect a transmission input pulley installed on an input shaft of a transmission from a main shaft input side pulley of the first belt transmission mechanism to a second transmission belt to transfer power of a motor to a reducer; The transmission output pulley installed on the transmission output shaft of the second belt transmission mechanism and the third belt transmission mechanism connected to the third transmission belt of the reducer input side pulley installed on the input shaft of the reducer, and the rotation speed of the concentrated screw and wedge wire screen It is possible to increase the rotation torque by increasing the speed more finely than the rotation speed of the rotor.
The drainage means for discharging the concentrated dewatered wastewater includes a screw shaft in which the first drainage hole is drilled; One end is fixed horizontally in the screw shaft while a second drain hole is formed to re-introduce water introduced into the first drain hole, and the other end is fixed to the main shaft, and the water introduced into the second drain hole is discharged. A drain pipe formed at an end of which the third drain hole is fixed to the main shaft; A main shaft having a fourth drain hole associated with a third drain hole formed in the drain pipe; And a shaft support having a fifth drainage hole associated with a fourth pipe formed in the main shaft.
In the present invention, unlike the wedge wire screen reciprocating relative to the rotating rotor in the conventional apparatus, the thickening screw and the rotor and the wedge wire screen are rotated at the same time, while the thickening screw and the wedge wire screen are rotated in the same direction at the same time The rotor is concentrated and dehydrated in two stages while transporting the sludge while rotating in the opposite direction slower than the thickening screen and the wedge wire screen, and finally the compressed and dehydrated sludge cake is discharged while passing through the slide gate valve.

As a result, the water content of industrial sludge discharged as waste can be reduced by more than 10%, thereby reducing the volume and weight of dehydrated waste by more than 20%, thereby reducing the processing cost, energy of input heat source during drying and incineration, and environment caused by landfilling of sludge. Pollution can be prevented.

The present invention is a two-phase dewatering device composed of a system in which the primary high concentration continuous centrifugal concentrator and the secondary high pressure compression dehydrator are fused in a closed structure, and the dehydration efficiency is improved by operating simultaneously with the centrifugal concentration method and the high pressure rotary screw press principle. It can be maximized. The device volume is also compact, minimizing installation space and reducing energy consumption and noise so that energy saving and pleasant working environment can be maintained.
Dehydration proceeds by first concentrating the sludge followed by second dehydration, and the first condensation causes an artificial specific gravity difference in the sludge to concentrate the sludge with optimum efficiency, which is useful for continuous concentrating than other methods such as gravity concentration. In addition, it is possible to increase the stabilization and processing efficiency of the concentrate by minimizing the size of facilities and minimizing environmental problems.
Therefore, according to the present invention, it is possible to efficiently separate moisture from various high-functional industrial sludges containing a large amount of water such as paper, textile, dyeing and sewage sludge to provide optimum performance and to fit the scale of industrial facilities. It is possible to develop dehydration equipment and spread to other industries where similar processes are necessary.

Features and advantages of the technical features of the present invention as described above will become more apparent by the embodiments described in detail by the accompanying drawings.

Hereinafter, an embodiment in which the technical spirit of the present invention is implemented will be described in detail.
In the following embodiments, the reference numerals given to the components described in the drawings are given irrespective of the reference numerals given to FIGS. 1 and 2. Therefore, what is necessary is just to recognize it as the code | symbol given to the element which concerns on this invention separately from the code which overlaps with the code | symbol shown in FIG.

3 to 7 show drawings related to embodiments of the invention.

As referred to in this figure, the present invention provides a base 1, a frame 2, a thickening screw 3, a rotor 4, a wedge wire screen 5, a slide gate valve 6, a wastewater supply means, and a drive. Means and drainage means.

The upper part of the base 1 is provided with a frame 2 and a driving means.

The frame 2 is installed on the base 1 while the fixing grooves 22 and 23 are formed to be opened from the upper portions of both side plates 20 and 21 to assemble the concentrated screw 3 and the wedge wire screen 5. And, the rotor (4) assembly is seated and installed, the bottom surface is formed with a drain pipe 24 for discharging the water separated from the sludge by the concentration and dehydration, in the axial direction in which the wedge wire screen (5) is installed A plurality of washing water spray nozzles 27 are installed to clean the outside of the wedge wire screen 5.
Concentrated screw 3 is a screw shaft 30 is formed as a hollow body, the water supply hole 39 is introduced into the waste water, the screw 31 is formed to gradually narrow the outer diameter toward the outlet side screw shaft 30 On the outer circumferential surface of one end of the fixed plate 33 to which the pushing plate 32 for driving the slide gate valve 6 and the wedge wire screen 5 is fixed, the other end is fixed to the main shaft 7. Is fixed to.
The outlet pitch P1 of the screw 31 is formed narrower than the inlet pitch P2, so that the conveyance and concentration efficiency can be improved.

The assembly of this thickening screw 3 is supported by a bearing block 25, one side of which is inserted and seated in a fixing groove 22 formed in the side plate 20 of the frame 2, and the other of the side plate of the frame 2. Centrifugal screws are rotatably fixed to the rotor 4 assembly supported by another bearing block 26 inserted and seated in the fixing groove 23 formed in the 21 to be supplied by the wastewater supply means. It is concentrated primarily by compression.
The rotor 4 has a compression screw 40 formed on the outer circumferential surface of the rotor 4 and is installed inside the wedge wire screen 5, and the concentration screw 3 is accommodated therein, and the waste water concentrated and discharged by the concentration screw 3 is discharged. The inlet side inclined portion 42 is formed in which one side, which becomes the inlet side into which the inlet side is introduced, is formed with an outlet 41 through which the concentrated wastewater is introduced, and the outer diameter gradually increases in the screw 31 of the concentrated screw 3. The narrowly formed portion can be contacted, and on the other hand, an outlet side inclined portion 43 is formed in which the circumferential interval formed with the inner diameter of the wedge wire screen 5 is narrowed.
The compression screw 40 pitch is gradually narrower from the outlet side pitch P3 to the outlet side pitch P4 so that the feed and compression efficiency can be improved.

The rotor 4 is rotatably supported at one end by the fixed disc 33, and the other end is supported by the bearing block 25 by a shaft support 44 on which the main shaft 7 is rotatably inserted. And the sludge which is installed on the side plate 21 and dehydrates the wastewater concentrated and transferred from the concentrated screw 3 at high pressure while being rotated by the power of the driving means, and can be fixed to the inner circumferential surface of the wedge wire screen 5. Compress and dewater the sludge while removing the scale.

The wedge wire screen 5 receives the rotor 4 while one end is fixed to the fixed disk 33 fixed to the screw shaft 30 to rotate together with the concentrated screw 3, the other end of the rotor It is rotatably coupled in a sealed state with the flange of (4) to produce a sludge cake by the rotor (4), and the dewatered water is discharged.
The slide gate valve 6 is slidably installed on the outer circumferential surface of the rotor 4 at one side of the wedge wire screen 5 to discharge the sludge cake dehydrated by the rotor 4 and the wedge wire screen 5. It is provided with a gap adjusting means for adjusting the interval between the sludge cake is discharged.
The gap adjusting means includes an air cylinder 60, a thrust bearing 62, a pushing plate 32, and a rod 64.
The air cylinder 60 is fixed to the side plate 20 of the frame 20.
The thrust bearing 62 is fixed to the piston rod 61 of the air cylinder 60.
The pushing plate 32 is slidably fixed to the screw shaft 30 while the thrust bearing 62 is in rolling contact with one side.
The rod 64 has one end so as to move the slide gate valve 6 in the axial direction when the pushing plate 32 is pushed by the thrust bearing 62 moving by the forward drive of the air cylinder 60. Is fixed to the pushing plate 32 and the other end thereof is fixed to the slide gate valve 6 through the fixed disk 33.

Accordingly, the sludge cake is discharged while the thrust bearing 62 fixed to the piston rod 61 of the air cylinder 60 contacts the pushing plate 32 fixed to the screw shaft 30 and moves to the outlet side of the rotor 4. You can adjust the amount.
The waste water supply means is a water supply pipe 37 in which a first water supply hole 38 coinciding with the second water supply hole 39 of the screw shaft 30, which is a hollow shaft, is drilled and inserted therein from one end of the screw shaft 30. The sludge mixed wastewater is supplied to the concentrated screw 3.
The drive means includes a rotational speed of the motor 8, a screw shaft 30, a main shaft 7, a shaft support 44, and a rotor 4, and a rotational speed of the concentrated screw 3 and the wedge wire screen 5. It is configured to control, and to rotate the concentrated screw (3) and the rotor (4) and wedge wire screen (5) in order to centrifugally dehydrate the wastewater supplied by the wastewater supply means.
The drainage means is formed in the other end while the first drainage hole 36 is drilled in the screw shaft 30, and the second drainage hole 301 is formed to re-introduce water introduced into the first drainage hole 36. The drainage pipe 300 is installed such that the drainage hole 302 is connected to the fourth drainage hole 71 formed in the main shaft 7, and the third drainage hole 302 of the drainage pipe 300 is formed of the main shaft 7. It is configured to be connected to the fourth drainage hole 71 and the fifth drainage hole 440 formed in the shaft support 44.
The screw shaft 30 is integrally fixed to the wedge wire screen 5 to the stationary disk (33).
The main shaft 7 transmits the power of the motor 8 by the first belt transmission mechanism to rotate the rotor 4 which is integrally fixed to the shaft support 44 fixed to one side.

The shaft support 44 is supported by the bearing block 25 on the side plate 22 of the frame 2 after the main shaft 7 is rotatably inserted and rotates with the power of the motor 8.

The rotational speed of the rotor 4, the concentrated screw 3 and the wedge wire screen 5 is controlled by the motor 8, the transmission 9, the reducer 100, the first belt transmission mechanism, the second belt transmission mechanism, It is made by a three-belt motor.
In the first belt transmission mechanism, the motor output side pulley 81 installed on the drive shaft 80 of the motor 8 and the main shaft input side pulley 70 installed on the main shaft 7 are connected to the first electric belt V1. To transmit power of the motor 8.
In the second belt transmission mechanism, the transmission input pulley 91 installed on the input shaft 90 of the transmission 9 is connected to the second transmission belt V2 from the main shaft input side pulley 70 of the first belt transmission mechanism. The power of (8) is transmitted to the reducer 100.
The third belt transmission mechanism includes a transmission output side pulley 93 installed on the output shaft 92 of the transmission 9 of the second belt transmission mechanism and a reduction gear input side pulley 102 installed on the input shaft 101 of the reduction gear 100. Is connected to the third transmission belt (V3) to be transmitted to the main shaft (7) to rotate the concentrated screw (3) and wedge wire screen (5) in the direction opposite to the rotation direction of the rotor (4) .
The output shaft 103 of the reducer 100 is coupled to the main shaft 7.

Looking at the operation state of the sludge dewatering in the sludge dewatering device is configured as follows.

First, the wastewater is introduced into the water supply pipe 37 by a fixed quantity supply pump (not shown).

When the motor 8 is driven, the main shaft input side pulley 70 is rotated by the motor output side pulley 91 and the first transmission belt V1.

The shaft support 44 is fixed to the main shaft input side pulley 70, and the rotor 40 is fixed to the shaft support 44 so that the rotor 4 is rotated by directly receiving the power of the motor 1. do.

At the same time, the power of the main shaft input pulley 70 is transmitted to the transmission input pulley 91 installed on the input shaft 90 of the transmission 9 by the second transmission belt V2, and then the transmission output shaft pulley 92. And transmit power to the reducer input side pulley 102 of the reducer 100.

The power input to the reducer 100 through the transmission 9 is thus decelerated to an appropriate torque and then rotates the main shaft 7 through the output shaft 103 of the reducer 100.

At this time, the concentrated screw (3) is fixed to the main shaft (7), the concentrated screw (3) is fixed to the wedge wire screen (5) so that the concentrated screw (3) and the wedge wire screen (5) at the same rotational speed When the number of revolutions of the main shaft 7 is further increased by about 2 to 5 rpm through the output shaft 103 of the reducer 100, the rotation torque is increased by the inverse of the reduction ratio, so that the rotor 4 rotates. The thickening screw 3 and the wedge wire screen 5 are rotated at a speed faster than the speed.

Meanwhile, the wastewater flowing into the water supply pipe 37 is led to the outside of the screw shaft 30 through the first water supply hole 38 and the second water supply hole 39 by centrifugal force generated while the concentrated screw 3 rotates. It starts to aggregate on the inner circumferential surface of the rotor 4, the water generated by the concentration is the first drain 36, the second drain 301, the third drain 302, the fourth drain 71 and the fifth drain Discharged through 440.

On the other hand, in order to increase the rotation speed of the feed screw 30 and the wedge screen 5 finer than the rotation speed of the rotor 4 and to increase the rotation torque, the pulley 2 is partially driven by the input shaft of the transmission 7. Power is transmitted to the pulley 90 to transmit power to the output shaft pulley 91 of the transmission 7 and the input shaft pulley 101 of the reducer 100. As a result, the rotational speed of the main shaft 7 is further increased by about 3 rpm through the output shaft of the reduction gear 100, and at the same time, the rotation torque can be increased by the inverse of the reduction ratio.

The sludge aggregated on the inner circumferential surface of the rotor 4 by the centrifugal force by the rotating concentrating shaft 3 is moved toward the outlet 41 as the screw 31 rotates, so that the primary concentration is made in the inclined portion 42. The water generated here is discharged through the first drainage hole 36, the second drainage hole 301, the third drainage hole 302, the fourth drainage hole 71 and the fifth drainage hole 440.
As described above, the sludge discharged to the discharge port 41 by primary concentration is moved to the outlet where the slide gate valve 6 is installed by the compression screw 40 of the rotor 4, and the high-pressure dehydration by centrifugal compression is performed secondly. Proceed. Here, the sludge and the discharged water are discharged through the wedge wire screen 5 and discharged to the drain hole 24 formed on the bottom of the frame 2 together with the water discharged from the fifth drain hole 440.
This two-step high pressure dehydration can be effectively proceeded by the deviation of the speed at which the concentrated screw 3 and the wedge wire screen 5 rotates and the speed at which the rotor 4 rotates.
For example, if the main shaft input side pulley 70 directly receiving the power of the motor 8 is rotated at 1000 rpm, the rotor 4 rotates at 1000 rpm, and, unlike the rotor 4, the transmission 9 and the speed reducer are different. The concentrated screw 3 and the wedge wire screen 5 which are powered through the 100 are slightly faster than the rotational speed of the rotor 4 at 1000 rpm, preferably at about 1003 rpm with respect to the rotational speed of 1000 rpm. With the rotor 4 is rotated in the opposite direction of rotation.
Therefore, the concentrated screw 3 rotates about 3 rpm faster than the rotor 4 so that the concentrated sludge can be discharged to the outlet 41 of the rotor 4, and the concentrated screw rotates in the opposite direction to the rotor 4. The wedge wire screen 5, which is integrally connected to the shaft 3, receives the power of the transmission 9 and the reducer 100 and simultaneously rotates at a low speed.
In other words, the concentrated sludge introduced to the right side of the rotor 4 through the outlet 41 is dehydrated while moving to the left side in close contact with the inner wall of the rotor 4 rotating at about 100 rpm and the wedge wire screen 5 rotating at about 1003 rpm. The process will be done.
When the internal pressure of the sludge cake becomes larger than the support pressure of the slide gate valve 6 by the compression dehydration process, the slide gate valve 6 is opened to discharge the sludge cake, and the outer circumferential surface of the wedge wire screen 5 is sprayed with washing water. Solidification of the sludge can be prevented by the washing water sprayed from the nozzle 27.

The discharge gap of the slide gate valve 6 through which the sludge cake is discharged is in contact with the pushing plate 32 in which the thrust bearing 62 horizontally moved by the air cylinder 60 moves, and moves the slide gate valve 6. It is possible by supporting.

9 to 11 illustrate a scraper 45 formed in a section of the rotor 4 to transfer sludge as well as to clean the inner circumferential surface of the wedge wire screen 5 by rotating centrifugal force as another embodiment of the present invention. The structure is shown.
This function automatically cleans the inside of the wedge wire screen 5 using the self-centrifugal force of the scraper S inserted into the outer circumferential surface of the rotor 4 to prevent the slot of the wedge wire screen 5 from being blocked. Has

Descriptions related to the rotational speed (rpm) in the above embodiment is shown as an example to help the understanding of the present invention and does not limit the rotational speed of the present invention.

1 is a cross-sectional view showing an example of a conventional centrifugal dewatering device

Figure 2 is a cross-sectional view showing another example of a conventional centrifugal dewatering device

3 is an exploded perspective view of the present invention

4 is a perspective view of the present invention

5 is a front view of the present invention

6 is a plan cross-sectional view of the present invention.
Figure 7 is an enlarged cross-sectional view showing an open state of the slide gate valve of the present invention.
Figure 7a is an enlarged cross-sectional view showing a state in which the slide gate valve of the present invention is closed.
8 is a side view of the present invention
9 is a perspective view showing a rotor according to another embodiment of the present invention.
10 is a cross-sectional view of a wedge wire screen assembly in another embodiment of the present invention.
11 is an enlarged cross-sectional view of portion A of FIG. 10;
* Explanation of symbols for the main parts of the drawings
1: Base 2: Frame
3: thickening screw 4: rotor
5: wedge wire screen 6: slide gate valve
7: main shaft 24: drain pipe
30: screw shaft 32: pushing plate
33: fixed disk 40: compression screw
41: outlet 42: inlet slope
43: outlet side inclined portion 44: shaft support

Claims (12)

A first step of introducing the waste water in which the sludge is mixed into the rotor having a rotating screw shaft through a rotating water supply pipe; A second step of firstly separating the sludge and water from the introduced wastewater by agglomerating the sludge in the wastewater toward the inner circumferential surface of the rotor by using the centrifugal force of the screw shaft to inject the wastewater introduced in the first step; A third step of discharging the wastewater, which is agglomerated and separated in the second step, through a drain hole formed in the screw shaft, and condensing the sludge to the space between the rotor and the wedge wire screen by concentrating the sludge by the action of a rotating screw. step; A fourth step of compressing the concentrated sludge discharged in the third step by a rotating rotor to dehydrate the wedge wire screen; And a fifth step in which the sludge cake compressed and dewatered in the fourth step is discharged through the slide gate valve, and the water discharged to the wedge wire screen is discharged to the drain pipe. Dehydration method of concentrated high-pressure rotary screw press 2 step. The centrifugal concentrator for reducing industrial sludge moisture content of claim 1, wherein the screw shaft, the rotor, and the wedge wire screen are simultaneously rotated at a high speed in the second, third, and fourth stages to coagulate, concentrate, and dehydrate. High pressure rotating screw press 2 step dewatering method. The method of claim 2, wherein in the third step, the rotation speed of the screw shaft is faster than the rotation speed of the rotor, so that the concentrated screw can transfer the concentrated concentrated sludge to the outlet toward the outlet. Centrifugal concentrated high pressure rotary screw press 2 step dewatering method. 3. The method of claim 2, wherein the wedge wire screen has a higher rotation speed than the rotor in the fourth step, so that rapid centrifugal dehydration is achieved. 2. . Base; A frame installed on the base; A screw shaft installed horizontally rotatably with a bearing in the frame; A rotor accommodating a concentrated screw formed in the screw shaft; A wedge wire screen for accommodating the rotor to discharge the centrifugal water; A slide gate valve installed on the outer circumferential surface of the rotor to have a gap adjusting means for adjusting an interval at which the sludge dehydrated by opening and closing at one side of the wedge wire screen is discharged; Wastewater supply means for supplying wastewater containing sludge to the screw shaft; And driving means for rotating the screw shaft, the rotor, and the wedge wire screen to centrifugally concentrate and dewater the wastewater supplied by the wastewater supply means. And a centrifugal condensation high speed rotary screw press industrial sludge high pressure two-step dewatering device for reducing industrial sludge moisture content, characterized in that it comprises a drainage means for discharging the concentrated and dehydrated wastewater. The wastewater supply means of claim 5 wherein: A screw shaft for drilling the water supply hole and forming a hollow shaft; Centrifugal condensation high speed rotary type for industrial sludge moisture content reduction characterized in that it comprises a water supply pipe for drilling the water supply hole corresponding to the water supply hole of the screw shaft is inserted from one end of the screw shaft into the waste water mixed with the sludge Screw Press Industrial Sludge High Pressure Two Process Dewatering Equipment. The method of claim 5, wherein the gap adjusting means: An air cylinder; A bearing fixed to the piston rod of the air cylinder; A pushing plate to which the bearing is slidably fixed to the screw shaft while in rolling contact with one side; One end is fixed to the pushing plate and the other end is a slide gate valve to move the slide gate valve axially when the pushing plate is pushed by the thrust bearing moving by the forward drive of the air cylinder. Centrifugal concentrating high speed rotary screw press for industrial sludge high pressure two-stage dewatering device, characterized in that it comprises a rod fixed to the industrial sludge moisture content. The method of claim 5 wherein the drive means: motor; A screw shaft to which the wedge wire screen is integrally fixed; A main shaft to which the screw shaft is fixed to rotate by the power of the motor; A shaft support rotatably inserted into the main shaft and supported by a thrust bearing in a base, the shaft support being rotated by the power of the motor; And a reducer which transmits power of the motor to the main shaft to adjust the rotational speed of the rotor and the rotational speed of the concentrated screw and wedge wire screen. A first belt transmission mechanism configured to connect the motor output side pulley installed on the drive shaft of the motor and the main shaft input side pulley installed on the main shaft with a first transmission belt to transfer power of the motor to the main shaft; A second belt transmission mechanism configured to connect a transmission input pulley installed on an input shaft of a transmission from a main shaft input side pulley of the first belt transmission mechanism to a second transmission belt to transfer power of a motor to a reducer; Reduced industrial sludge moisture content, characterized in that it comprises a third belt transmission mechanism is connected to a third transmission belt is a transmission output side pulley installed on the transmission output shaft of the second belt transmission mechanism and the reducer input side pulley provided on the input shaft of the reducer. Centrifugal Concentration High Speed Rotary Screw Press Industrial Sludge High Pressure Two Process Dewatering Equipment. The method of claim 5 wherein the drainage means: A screw shaft in which the first drain hole is drilled; One end is fixed horizontally in the screw shaft while a second drain hole is formed to re-introduce water introduced into the first drain hole, and the other end is fixed to the main shaft, and the water introduced into the second drain hole is discharged. A drain pipe formed at an end of which the third drain hole is fixed to the main shaft; A main shaft having a fourth drain hole associated with a third drain hole formed in the drain pipe; Centrifugal concentrating high speed rotary screw press for industrial sludge high pressure two-stage dewatering device, characterized in that it comprises a shaft support which is formed with a fifth drainage hole associated with the fourth pipe formed in the main shaft. The method of claim 5, wherein the assembly of the screw shaft and the rotor assembly is opened from the top of the frame centrifugal concentration high speed rotary screw press for industrial sludge high pressure two-stage dewatering apparatus for reducing the industrial sludge moisture content. According to claim 5, while one side of the thickening screw is formed to gradually narrow the outer diameter, the corresponding rotor has a conical shape on one side of the inlet side into which the wastewater discharged by the thickening screw 3 is discharged. The inlet side inclined portion 42 is formed to form an outlet 41 into which the concentrated wastewater is introduced while being formed so that a portion of the screw 31 of the concentrated screw 3 which is gradually narrower in diameter can be contacted. Centrifugal condensation high speed rotary screw press industrial sludge high pressure two-stage dewatering device for reducing industrial sludge moisture content. The industrial sludge moisture content reduction according to claim 5, wherein the scraper 45 is formed on the outer circumferential surface of the rotor 4 to transport the sludge, and at the same time, the inner circumferential surface of the wedge wire screen 5 can be cleaned by rotating centrifugal force. Centrifugal Concentration High Speed Rotary Screw Press Industrial Sludge High Pressure Two Process Dewatering Equipment.

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