KR101189158B1 - Sludge recycling system - Google Patents

Abstract

PURPOSE: A sludge treating facility is provided to improve the durability of the facility by forming respective drying units with variety kinds of materials according to the characteristic of sludge. CONSTITUTION: A sludge treating facility includes a first drier(100), a second drier(200), a sludge storing bath(300), a sludge transferring unit(400), and a distributing unit(500). The first drier and the second drier respectively include body parts, a pair of stirring shafts, and paddles. The paddles are protruded from the stirring shafts and rotate in the sludge. The second drier receives primarily dried sludge from the first drier and heats and dries the sludge. The distributing unit adjusts the distributing rate of dried sludge from the second drier.

Description

Sludge Treatment Facility for Recycling Dry Sludge {SLUDGE RECYCLING SYSTEM}

The present invention relates to a sludge drying equipment, and more particularly, to improve drying efficiency by drying in a dryer composed of different materials according to the water content of the sludge, and to improve the sludge treatment efficiency by mixing the dry sludge with a high water content sludge. It relates to a processing facility.

In general, various industrial waste sludges are generated in industrial sites, sewage treatment plants, or wastewater treatment plants. Therefore, attention is focused on techniques for treating the waste sludges. In order to separate the water (waste water) contained in the waste sludge with sludge, sludge and water are separated using a concentrator and dehydrator, and the separated water is purified and discharged and the sludge is disposed of through an appropriate process or It may be recycled after treatment.

However, when landfill sludge that has not been removed to a certain level is disposed of in soil, environmental pollution is caused by severe soil pollution and water pollution due to odor or leachate.In addition, when incineration treatment, if water content is large, It is uneconomical because the consumption of the injected fuel is increased.

Among the various waste sludges generated are food waste, sewage sludge, manure, and industrial wastes generated at the factory.The waste sludge is dewatered, the liquid is treated with wastewater, and the collected solids contain about 80% or more of water. These wastes have been disposed of after lowering the water content to about 25-35%.

However, efforts have been made to recycle the waste sludge since the bill that could be used as solid fuel when the water content of the sludge is lowered to 10% or less. Korean Patent Publication No. 2009-0098360 discloses a water content of about 30% by spraying heated hot air from a primary heat medium liquid dryer, and a water content of about 20% by using hot air at the same time as grinding in a secondary dryer. In addition, the method of lowering the water content to about 10% by using a hot product at the same time as the crushing in the tertiary dryer is used. However, in order to finally obtain sludge having a water content of about 10%, 2 There is a problem that the grinding blade used in the primary dryer and tertiary dryer is badly worn.

In addition, Korean Patent No. 0676503 discloses a method of attaching a horseshoe to a paddle to prevent damage to the entire paddle due to abrasion when the sludge is dried, but since the hollow paddle having a weak abrasion is formed integrally with the rotating shaft, the horseshoe is replaced. If you do not have to eventually replace the rotating shaft, there is a problem that can not be restarted for a long time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sludge drying apparatus capable of lowering the water content to 10% or less by using a drying apparatus for recycling dry sludge.

Another object of the present invention is to provide a sludge drying equipment which improves the drying efficiency and durability by having a different configuration for each section according to the water content of the sludge contained therein.

The present invention provides a body portion forming a chamber that is a sludge accommodating space, a pair of agitating shafts disposed parallel to the chamber and rotating in opposite directions, and a plate protruding from the agitating shaft to dig and rotate between sludges. It includes, the stirring shaft and the paddle primary dryer made of a hollow shape; A body portion forming a chamber which is a sludge accommodating space, a pair of agitating shafts disposed parallel to the chamber and rotating in opposite directions, and paddles protruding from the agitating shafts to dig into and rotate between the sludge; A second dryer for heating and drying the first drying sludge discharged from the primary drying apparatus; A sludge storage tank for storing dry sludge discharged from the secondary dryer; Sludge conveying means for transferring the dry sludge discharged from the secondary dryer to the primary dryer or the sludge storage tank; And a distribution means for controlling a distribution ratio of the dry sludge discharged from the secondary dryer.

The sludge conveying means may comprise a conveyor facility.

The distribution means includes a branch pipe in which one inlet pipe and two outlet pipes are integrally connected;

It is provided inside the branch pipe may be configured to include an opening and closing piece for selectively opening and closing the outlet pipe.

As another form of the distribution means, the first inlet is provided with an inlet through which the dry sludge discharged from the secondary dryer is input, and a discharge port connected to the sludge storage tank, and having an auxiliary discharge port between the inlet and the discharge port. It may include a conveying screw, and a second conveying screw connected to the auxiliary discharge port, wherein the second conveying screw is connected to the sludge conveying means for conveying the dry sludge to the primary dryer, the rotation speed is variable It is desirable to be able to control the sludge feed amount.

The primary dryer may include a condensate discharge tube at the center of the sludge inlet-side stirring shaft, and the stirring shaft may be inclined downward toward the condensate discharge tube.

In addition, the stirring shaft may be provided with a bucket for inducing condensate to the condensate discharge pipe, it may be provided with a plurality of connecting pipes connecting the stirring shaft and the inner space of the paddle. At this time, the connecting pipe is preferably formed to protrude into the stirring shaft.

In addition, the coating removal device for removing the sludge coating on the paddle surface by intermittently spraying compressed air into the interior of the primary dryer or secondary dryer.

The sludge drying equipment according to the present invention has the effect of drying the sludge of the high water content to a level of 10% by using a secondary dryer.

In addition, the sludge drying equipment according to the present invention has the effect of improving the treatment efficiency by lowering the water content of the sludge injected by circulating the dried sludge.

In addition, each dryer is made of a different material in accordance with the characteristics of the sludge, which is the object to be treated, thereby bringing an effect of improving the durability of the entire apparatus.

1 is a block diagram of a sludge treatment facility according to an embodiment of the present invention,
Figure 2 is a longitudinal sectional view showing the interior of the primary dryer of the present invention,
Figure 3 is a cross-sectional view showing the interior of the primary dryer of the present invention,
4 is a cross-sectional view showing a stirring shaft condensate discharge structure of the primary dryer of the present invention,
5 is a cross-sectional view showing an inner bucket of the stirring shaft of the primary dryer of the present invention;
6 is a configuration diagram showing a first embodiment of the distribution means of the present invention;
7 is a configuration diagram showing a second embodiment of the distributing means of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the sludge treatment facility for recycling the dry sludge according to the present invention.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a side view of a sludge treatment plant according to an embodiment of the present invention.

As shown, the sludge drying equipment according to the present invention comprises a secondary dryer, characterized in that for recycling the sludge.

Sludge drying equipment according to the present invention is a sludge storage tank 300 for storing the sludge primary and secondary dryer 200, the finished sludge for drying the sludge. Distributing means 500 for distributing the sludge discharged from the secondary dryer 200, and conveying the sludge discharged from the secondary dryer 200 to the distributing means 500, and discharged from the distributing means 500. Sludge transfer means 400 for transferring the sludge to the primary dryer 100 or the sludge storage tank 300 to be.

Distributing means 500 is configured to adjust the ratio of the dry sludge sent to the primary dryer (100).

That is, the distribution means 500 may control how much of the dry sludge discharged from the secondary dryer 200 is recycled to the primary dryer 100.

The primary dryer 100 has a body portion 110 forming a chamber that is a sludge receiving space, a pair of stirring shaft 160 disposed in parallel to the chamber and rotated in opposite directions to each other, and in the stirring shaft And a paddle (not shown) protrudingly formed to rotate between the sludge, and the stirring shaft 160 and the paddle are hollow, and indirectly heats the sludge by supplying steam to the stirring shaft and the paddle. To provide a structure for drying.

The secondary dryer 200 is to receive the primary dry sludge discharged from the primary dryer 100 to indirectly heat and dry the body dryer 210 to form a sludge accommodating chamber and the chamber. And a pair of stirring shafts 260 disposed in parallel to rotate in opposite directions, and paddles (not shown) protruding from the stirring shafts to rotate between the sludge.

Sludge storage tank 300 is for storing the sludge is completed, may be provided with a plurality, as shown, may be provided with one.

The present invention is configured to re-inject some of the sludge discharged from the secondary dryer 200 to the primary dryer 100, and the rest is transferred to the sludge storage tank 300 and stored.

To this end, it includes a distribution means 500 and the sludge transfer means 400.

The sludge conveying means 400 may include a vertical conveyor, a horizontal conveyor, a distribution conveyor and the like.

The sludge conveying means 400 includes a plurality of sections.

Sludge conveying means 400 is a section connecting the outlet of the secondary dryer 200 and the inlet pipe (502 of FIG. 6) of the distribution means 500, the first outlet pipe (504 of FIG. 6) And a section connecting the inlet 112 of the primary dryer 100, a second outlet pipe (506 of FIG. 6) of the distribution means 500, and a section connecting the sludge storage tank 300.

The primary dryer 100 is provided with two sludge inlets 112, one inlet is a dry sludge discharged from the secondary dryer 200, the other inlet is a new undried sludge is added It may be configured to, and may be configured so that both the dry sludge and the undried sludge into one inlet.

The sludge that is the object to be treated is introduced through the sludge inlet 112 of the primary dryer 100. The injected sludge is heated and dried in the primary dryer 100 and then discharged through the sludge outlet 115 of the primary dryer 100.

The primary treatment sludge discharged from the primary dryer 100 is introduced into the secondary dryer 200 through the sludge inlet 212 of the secondary dryer 200, and then heat-dried inside the secondary dryer to perform secondary drying. It is discharged to the outlet of 200.

The water content of the sludge introduced into the primary dryer 100 is 80% or more, the water content of the sludge discharged from the primary dryer 100 is 25 ~ 35% level, of the dry sludge discharged from the secondary dryer 200 It is preferable that a moisture content is 10% or less. Here, the sludge introduced into the primary dryer 100 refers to the water content of purely newly introduced sludge, and is mixed with the dry sludge discharged from the secondary dryer 200. Sludge moisture content is 50 ~ 60%.

The sludge moves inside the respective dryer chambers 100 and 200 and is indirectly heated and dried and then discharged. This process is performed by rotation of the stirring shaft and the paddle.

The chamber is formed in a long cylindrical shape to accommodate the sludge therein. When the sludge is introduced through the sludge inlet 112 of the primary dryer 100, the sludge is accumulated in the right direction of the drawing shown, they are gradually moved to the left direction by the rotation of the paddle through the sludge outlet 115 It has a structure to be discharged. In the case of the secondary dryer 200 is input to the left and discharged to the right.

Paddles provided in each of the dryers 100 and 200 have a fan-shaped shape in which some sections are open, and have a wedge-shaped cross section in the radial direction. As these paddles cross rotate, the sludge inside is dispersed into the space between the paddles, mixed and stirred.

Through the continuous process, since the sludge is sequentially moved to the right side in the primary dryer 100, drying by indirect heating proceeds from the sludge inlet 112 side to the sludge outlet 115 side, thereby lowering the water content of the sludge. . In the case of the secondary dryer 200, the sludge is dried in the same manner.

For this reason, even if sludge is continuously introduced, the sludge having a low moisture content through which the drying is completed can be discharged through the sludge discharge port 215.

In the present invention, part of the dry sludge is stored in the sludge storage tank 300, and a part of the dried sludge is re-introduced into the primary dryer 100, thereby lowering the sludge moisture content in the primary dryer 100, thereby improving the treatment efficiency of the primary dryer. It is characterized by.

The dry sludge discharged from the secondary dryer 200 is partly sent to the sludge storage tank 300 by the distribution means 500, and partly re-injected into the primary dryer 100 through the sludge transfer means 400. .

Sludge transfer means 400 may include a vertical, horizontal, distribution conveyor belt, etc., but is not limited to this configuration.

Figure 2 is a longitudinal cross-sectional view showing the interior of the primary dryer of the present invention.

As shown, the chamber 120 which is a sludge accommodating space is formed inside the primary dryer 100, and a pair of stirring shafts 160 and 170 disposed in parallel to each other is formed inside the chamber 120. Formed. Each of the stirring shafts 160 and 170 is formed with a plurality of paddles 162 and 172 having a fan shape in plan view and a wedge shape in cross section.

In addition, in the primary dryer 100 of the present invention, steam is supplied to the paddles 162 and 172 and the stirring shafts 160 and 170. To this end, the stirring shaft (160, 170) and paddles (162, 172) has a hollow shape with an empty inside, the inner space is formed to communicate with each other. Steam supplied through the stirring shafts 160 and 170 heats the stirring shafts 160 and 170 and the paddles 162 and 172, and the sludge is heated by the heated stirring shafts 160 and 170 and the paddles 162 and 172. Indirect heating

In the case of the secondary dryer 200, since the sludge having a low moisture content is heated by stirring inside, it is preferable to use at least equivalent HARDOX material, which is a kind of wear-resistant steel.

Depending on the condition of the sludge being treated, different materials can be used to extend the life of the equipment and improve its durability.

In the case of the primary dryer 100, since corrosion resistance is required rather than abrasion resistance by treating sludge having a high moisture content, it is preferable to manufacture a stainless steel material.

3 is a cross-sectional view showing the interior of the primary dryer of the present invention.

As shown, the paddles 162 and 172 are formed in a fan shape around the stirring shafts 160 and 170, and the inner spaces of the stirring shafts 160 and 170 and the respective paddles 162 and 172 are two. It is connected by connecting pipes 190 and 192.

Connecting to the two connectors (190, 192), the connector (190, 192) is to function as a steam supply path, and as a condensate discharge path, the steam supply pressure when connected to one connector This is because the condensate discharge may not be made smoothly.

Two connecting tubes 190 and 192 are formed at different positions, and one connecting tube 192 is formed at a portion where condensed water is temporarily collected during rotation of the paddle. In order to improve the condensate discharge function, for this purpose, it is possible to form the partition wall 195 to temporarily condensed condensate around the connection pipe 192.

In addition, the coating removal apparatus 700 may be provided inside the primary dryer.

Coating removal apparatus 700 is provided on the inside of the dryer to intermittently spray compressed air to remove the sludge coating film adhered to the surface of the paddle.

The coating removal apparatus 700 includes a compressor (not shown) for generating compressed air, a pressure tube 710 for temporarily storing the compressed air generated by the compressor, and a pressure tube 710 provided toward the paddle surface. And a spray nozzle 720 for spraying compressed air.

The injection nozzle 720 is preferably opened intermittently using a solenoid valve or the like.

The dryer according to the present invention has a structure that indirectly heats the sludge in contact with the paddle by heating the paddle, which causes the sludge to stick to the paddle surface. In other words, when the sludge is dried, a coating film is formed on the paddle surface. The sludge coating film prevents heat transfer.

The present invention includes a coating removal apparatus 700 for intermittently injecting compressed air to the paddle surface in order to remove such a sludge coating film.

Figure 4 is a cross-sectional view showing a stirring shaft condensate discharge structure of the primary dryer of the present invention, Figure 5 is a cross-sectional view showing a bucket inside the stirring shaft of the primary dryer of the present invention.

As described above, the stirring shafts 160 and 170 and the paddles 162 and 172 have a hollow shape to serve as a supply passage for steam, and the stirring shafts 160 and 170 and the paddles 162 and 172 are inside. Steam can also be condensate in the process. At this time, if the condensate is not discharged smoothly, the condensate may remain inside the stirring shaft, causing a problem of deterioration of thermal efficiency.

However, one side of the stirring shaft (160, 170) is provided with a condensate discharge pipe, the stirring shaft (160, 170) is formed to be inclined downward toward the discharge pipe side of the condensate. When condensate occurs in the stirring shafts 160 and 170, the condensate flows into the condensate discharge tube inside the stirring shafts 160 and 170. The condensate discharge pipe will be described later with reference to FIG. 5.

Condensate discharge pipe 175 is formed in the shape of the inlet side is widened in the center of the stirring shaft, the inlet side of the condensate discharge pipe 175 is provided with a bucket 177 to form a groove in the center as shown in FIG. As the stirring shaft rotates, the condensed water may be contained in the central portion of the bucket 177 and discharged to the condensed water discharge pipe 175.

6 is a configuration diagram showing a first embodiment of the distribution means of the present invention.

As shown, the distributing means 500 has a branch pipe shape in which one inlet pipe 502 and two outlet pipes 504, 506 are integrally connected, and an outlet pipe 504. 506 is selected therein. It includes an opening and closing piece 520 to open and close. The opening and closing piece 520 is connected to the drive shaft 530 to selectively close the outlet pipe 504 or 506 on one side according to the forward and reverse rotation of the drive shaft.

Therefore, some of the dry sludge supplied to the distribution means 500 is sent to the sludge storage tank 300 according to the position of the opening and closing piece 520, and some of the dry sludge is sent to the primary dryer 100 through the sludge transfer means 400. Will be sent.

7 is a configuration diagram showing a second embodiment of the distributing means of the present invention.

This embodiment constitutes a distribution means including two transfer screws.

The distribution means 600 according to the present embodiment includes an inlet 612 through which the dry sludge discharged from the secondary dryer is input, and an outlet 614 connected to the sludge storage tank, and the inlet 612 and the A first transfer screw 610 having an auxiliary discharge port 616 between the discharge port 616 and a second transfer screw 620 connected to the auxiliary discharge port.

The transfer screw is to rotate the screw inside the cylinder to transfer the dry sludge received therein, the present invention is provided with an auxiliary discharge port 616 in the middle of the first transfer screw 610 in the middle, the auxiliary discharge port 616 By connecting the second feed screw 620 capable of adjusting the feed rate, it is to be able to distribute the dry sludge at a desired ratio.

The discharge pipe 614 of the first conveying screw 610 is connected to the sludge conveying means connected to the sludge storage tank 300,

The auxiliary discharge pipe 616 of the first transfer screw 610 is connected to the inlet 622 of the second transfer screw 620. The discharge pipe 624 of the second conveying screw 620 is connected to the sludge conveying means directed to the primary dryer.

The second conveying screw 620 is formed so as to control the sludge feed rate of the rotation speed is variable, the amount of sludge discharged to the auxiliary discharge pipe 616 according to the rotational speed of the second conveying screw 620 is controlled. do.

For example, when 100 dry sludge is introduced into the input pipe 612 of the first transfer screw 610, if 40 dry sludge is discharged into the auxiliary discharge pipe 616, 60 dry sludge is discharged to the discharge pipe 614. Dry sludge is discharged. Since the amount of dry sludge discharged to the auxiliary discharge pipe 616 is determined by the rotation speed of the second feed screw, it is possible to control the distribution amount of the dry sludge.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

100: primary dryer
110:
120: chamber
160, 170: stirring shaft
162, 172: paddle
165, 175: discharge pipe
200: secondary dryer
300: sludge storage tank
400: sludge conveying means
500, 600: Distribution means
700: coating removal device
710: pressure tube
720: injection nozzle

Claims (9)

A body portion forming a chamber which is a sludge accommodating space, a pair of agitating shafts disposed parallel to the chamber and rotating in opposite directions, and paddles protruding from the agitating shafts to dig into and rotate between the sludge; A primary dryer having a stirring shaft and a paddle having a hollow shape;
A body portion forming a chamber which is a sludge accommodating space, a pair of agitating shafts disposed parallel to the chamber and rotating in opposite directions, and paddles protruding from the agitating shafts to dig into and rotate between the sludge; A second dryer configured to receive and heat the first dry sludge discharged from the first dryer;
A sludge storage tank for storing dry sludge discharged from the secondary dryer;
Sludge conveying means for transferring the dry sludge discharged from the secondary dryer to the primary dryer or the sludge storage tank; And
And distribution means for adjusting a distribution ratio of the dry sludge discharged from the secondary dryer.
The distribution means
A branch pipe in which one inlet pipe and two outlet pipes are integrally connected,
Sludge treatment equipment is provided in the branch pipe and comprises an opening and closing piece for selectively opening and closing the outlet pipe.
The method of claim 1,
The sludge conveying means is
Sludge treatment facility comprising a conveyor facility.
delete A body portion forming a chamber which is a sludge accommodating space, a pair of agitating shafts disposed parallel to the chamber and rotating in opposite directions, and paddles protruding from the agitating shafts to dig into and rotate between the sludge; A primary dryer having a stirring shaft and a paddle having a hollow shape;
A body portion forming a chamber which is a sludge accommodating space, a pair of agitating shafts disposed parallel to the chamber and rotating in opposite directions, and paddles protruding from the agitating shafts to dig into and rotate between the sludge; A second dryer configured to receive and heat the first dry sludge discharged from the first dryer;
A sludge storage tank for storing dry sludge discharged from the secondary dryer;
Sludge conveying means for transferring the dry sludge discharged from the secondary dryer to the primary dryer or the sludge storage tank; And
And distribution means for adjusting a distribution ratio of the dry sludge discharged from the secondary dryer.
The distribution means
An inlet through which dry sludge discharged from the secondary dryer is inputted;
A first transfer screw having a discharge port connected to the sludge storage tank and having an auxiliary discharge port between the inlet port and the discharge port;
And a second conveying screw connected to the auxiliary discharge port.
The method of claim 4, wherein
The second transfer screw is
Is connected to the sludge conveying means for transporting the dry sludge to the primary dryer,
Sludge treatment equipment characterized in that the rotation speed is variable and the sludge feed amount can be controlled.
The method according to claim 1 or 4,
The primary dryer
And a condensate discharge pipe at a center of the sludge inlet-side stirring shaft, wherein the stirring shaft is inclined downward toward the condensate discharge pipe.
The method according to claim 6,
Inside the stirring shaft
And a bucket for inducing condensate into the condensate discharge pipe.
The method according to claim 6,
And a plurality of connecting pipes connecting the stirring shaft and the inner space of the paddle, wherein the connecting pipe is formed to protrude into the stirring shaft.
The method according to claim 1 or 4,
Inside the primary dryer or secondary dryer
Sludge treatment equipment further comprises; a coating removal device for intermittently spraying compressed air to remove the sludge coating film on the paddle surface.

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