KR101955809B1 - Low Energy Sludge Drying Fuelization System Using Oxidation Dehydration, Hybrid Drying and Waste Heat Generation - Google Patents

Abstract

The present invention relates to an oxidation dewatering equipment for receiving an initial dewatering sludge and dewatering it after oxidation treatment to reduce the volume, weight and moisture content of the first dewatering sludge to produce intermediate dewatering sludge, a middle dewatering sludge having a reduced water content by the oxidation dewatering equipment A hybrid drying facility for drying and producing final sludge, a waste heat generation facility for generating electricity and heat by using waste heat of the flue gas generated during the drying process in the hybrid drying facility, a final sludge produced by the hybrid drying facility is gasified A sludge gas fueling facility used as an energy source for the drying process through the combustion chamber, an exhaust gas treatment facility for treating the exhaust gas discharged after the waste heat of the exhaust gas generated during the drying process, and a deodorizing device for removing odor substances generated during the drying process Low-energy sludge dry fuel . The present invention can simultaneously satisfy the sludge disposal cost and the energy saving effect by converting the dried material produced through the hybrid drying equipment into gasified fuel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a low-energy sludge drying fuelization system using oxidative dehydration, hybrid drying and cogeneration,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low energy sludge drying fueling system using oxidative dehydration, hybrid drying and cogeneration, and more particularly, to an oxidizing and dehydrating facility, a hybrid drying facility, a waste heat generating facility, a sludge gas fueling facility, And a low-energy sludge drying fueling system using hybrid drying and cogeneration.

Organic waste refers to sludge, which is a microbial remnant that usually occurs in the water treatment process of water, industrial water, industrial wastewater, sewage and manure.

Generally, most of the sludge generated in wastewater treatment (manure, livestock wastewater, food wastewater, industrial wastewater, etc.) is dehydrated by using most chemicals and contains moisture around 80%. The calorific value is usually 2,000 kcal / kg to 4,000 kcal / kg.

Conventional sewage sludge and livestock manure have been banned since January 2012, and wastewater has been banned since January 2013, and industrial wastewater has been disposed of in accordance with the Zero Emission Plan. And wastewater sludge have banned marine dumping since 2014, but they have suspended the marine dumping ban for two years because they give companies a period to prepare land treatment facilities. From 2016, industrial wastewater and wastewater sludge have been completely banned from marine dumping.

Measures will be taken to treat land disposal of banned wastes through the development of energy technologies for organic wastes that can be treated through the anaerobic digestion or gasification process or through the merging process. .

The discharged cakes have excessive energy costs for operating the sludge intermediate treatment facilities such as drying, carbonization and composting, but there is no realistic technology to install and operate facilities with expensive facilities and operating expenses.

The existing sludge treatment process does not effectively utilize sludge as an energy resource, and discharges carbon dioxide without production activity.

Conventional sludge disposal technology mainly uses incineration or landfill with sludge moisture content of about 30% through dehydration and drying device.

Drying apparatus The coagulant contained in the sludge is strongly adhered to the inner surface of the drying apparatus during long-term operation, resulting in difficulty in normal and long-time operation.

As the current sludge drying device, there are various applications such as hot air drying and screw type drying device using steam, but the surface moisture and free water of the sludge are dried quickly but the combined water inside the sludge and the evaporation of the internal water are not smooth, Most of the facilities are operated at a low drying efficiency even though they are about 40 minutes long.

Drying sludge is mixed in municipal waste incinerator, but there are cases in which incomplete burned flooring is increased due to problems of operation of grate due to large amount of minerals and coagulant contained in sludge

In addition, since the sludge is dried and then incinerated in the incinerator, problems may occur when the sludge is moved in the case of a small and medium-sized city where the total facility size is large and the generated sludge is small.

Sludge dewatering and drying are the main causes of civil complaints because of the odor problem in the city.

In order to solve the above-mentioned problems, KR Patent Application No. 10-2013-0127263 (entitled Sludge energizing apparatus using oxidative dehydration and dry combustion), a sludge weight reducing facility for concentrating, oxidizing and dehydrating sludge; A drying fueling facility for drying and crushing the sludge cake of the sludge reducing facility to produce powdered fuel; A waste heat generating equipment for producing heat and electricity by burning the powdered fuel produced by the dry fueling facility; A malodor removing and burning facility for burning odor generated in the drying process of the dry fueling facility together with powdered fuel; And an exhaust gas treatment facility for treating the exhaust gas generated in the waste heat generating facility and the powdery fuel combustion process of the odor removing and combustion facility to remove harmful substances,

KR Patent Application No. 10-2013-0103054 (entitled "Treatment and energization of organic wastes") is a pretreatment facility for receiving organic wastes, crushing and sorting them, dewatering them, separating them into contaminants, dehydrated cakes and dehydrated filtrate ; A dry fueling facility for receiving a dewatered cake separated from the impurities by the pretreatment facility and producing a powder fuel for energy of the combustion facility through a reprocessing process; And a process water production facility for producing a process water for treating exhaust gas of a combustion facility through a reprocessing process by receiving the dehydrated filtrate from which the impurities are separated by the pretreatment facility

However, in the case of the above-mentioned patent documents, there is a problem that the energy conversion efficiency is low due to high moisture content of the treated sludge.

Numerous papers and patent documents are referenced and cited throughout this specification. The disclosures of the cited papers and patent documents are incorporated herein by reference in their entirety to better understand the state of the art to which the present invention pertains and the content of the present invention.

<Prior Art Literature>

New technology certificate No. 414

New Technology Certificate No. 423

Registration number (date) 101364491 (2014.02.12)

Registration number (date) 101370978 (2014.02.28)

Registration number (date) 101481947 (2015.01.06)

Registration number (date) 101281672 (2013.06.27)

Registration number (date) 101250757 (March 31, 2013)

The inventors of the present invention have made extensive efforts to develop a sludge drying fueling system having an excellent energy conversion efficiency. As a result, the water content of the sludge is firstly reduced in the oxidative dehydration facility, and the final sludge having a water content of 3-10% is produced in the hybrid drying plant including the first drying section and the second drying section, It is possible to produce a sludge drying fueling system having an energy conversion efficiency when converted into energy through a waste heat power generation facility, thereby completing the present invention.

It is therefore an object of the present invention to provide a sludge drying fueling system.

Another object of the present invention is to provide a sludge drying fueling method

It is a further object of the present invention to provide a final sludge fueled.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention, claims and drawings.

The present invention provides a sludge drying fueling system.

The inventors of the present invention have made extensive efforts to develop a sludge drying fueling system having an excellent energy conversion efficiency. As a result, the water content of the sludge is firstly reduced in the oxidative dehydration facility, and the final sludge having a water content of 3-10% is produced in the hybrid drying plant including the first drying section and the second drying section, It has been confirmed that it is possible to produce a sludge dry fueling system with good energy conversion efficiency when converted to energy through waste heat power generation facilities.

According to one aspect of the present invention, there is provided an oxidation dewatering equipment for receiving an initial dewatering sludge, dewatering it after oxidation treatment to reduce the volume, weight and moisture content of the first dewatering sludge to produce intermediate dewatering sludge, A hybrid drying facility for drying the intermediate dewatered sludge whose moisture content is reduced to produce final sludge, a waste heat generation facility for producing electricity and heat using waste heat of the flue gas generated during the drying process in the hybrid drying facility, A sludge gas fueling facility for gasification of the final sludge produced through the combustion chamber and used as an energy source of the drying process, an exhaust gas treatment facility for treating the exhaust gas discharged after the waste heat of the exhaust gas generated during the drying process, Includes odor removal equipment to remove odorous substances It provides a low-energy sludge drying yeonryohwa system.

As used herein, the term &quot; sludge &quot; may refer to a sediment produced in the wastewater treatment or purification process.

As used herein, the term &quot; first dehydrated sludge &quot; may refer to sludge that has undergone conventional physical and / or chemical dehydration processes.

As used herein, the term &quot; intermediate dehydrated sludge &quot; may refer to the first dehydrated sludge that has undergone a physical and / or chemical dehydration process of the dehydration section.

As used herein, the term "final sludge" may refer to intermediate sludge that has undergone physical drying of the dryer.

As used herein, the term &quot; moisture content &quot; may refer to the rate at which a particular substance contains moisture.

As used herein, the term &quot; hybrid drying facility &quot; may refer to a drying facility to which two or more independent drying methods are respectively applied.

As used herein, the term &quot; flue gas &quot; may refer to a gas exhausted from a particular engine.

As used herein, the term 'direct drying hot air' may mean a gas flowing inside the duct for drying the dehydrated sludge in the duct for drying the wastewater sludge of the present invention.

As used herein, the term 'indirect drying hot air' may mean a gas flowing outside the duct to dry the dewatered sludge inside the duct from outside the duct for drying the wastewater sludge of the present invention.

As used herein, the term 'wet exhaust gas' may mean a gas discharged through a hot air outlet of a duct for drying the wastewater sludge of the present invention.

As used herein, the term 'initial drying hot air' may mean a gas before the wet exhaust gas flowing into the malodor burning unit of the present invention is heated and then separated by direct drying hot air or indirect drying hot air.

As used herein, the term 'dry cooling gas' may refer to a gas discharged to the outside of the sludge composite drying apparatus after the indirect drying process.

According to a preferred embodiment of the present invention, the oxidation dewatering apparatus of the present invention preferably further comprises a storage unit for storing the first dewatered sludge loaded, a transfer unit for transferring the stored first dewatered sludge, an oxidant coagulant input unit, A dewatering unit for dewatering the first dehydrated sludge agglomerated with oxidation, and a desorbing liquid storing unit for storing the desorption liquid generated in the dewatering unit.

It is a very important constitution that the system of the present invention includes an oxidative dehydration facility. This is because, if the water content of the intermediate dewatered sludge can be adjusted within the range of 50-68% by the administration of the oxidative coagulant, the energy consumption rate per sludge moisture removal in the whole process can be drastically reduced.

In the conventional sludge drying system, the energy consumption rate (kcal / kg _{water removal} ) per sludge water removal in the entire process is 800-1200 kcal / kg _{water removal} , whereas the system of the present invention, which includes an oxidation / It can be confirmed that the energy consumption rate (kcal / kg _{water removal} ) per unit is very excellent due to _removal of _water of 400-600 kcal / kg.

According to a preferred embodiment of the present invention, the hybrid drying equipment of the present invention preferably includes a first drying unit for primarily drying the intermediate dewatered sludge using waste heat of the flue gas, a second drying unit for crushing the intermediate dewatered sludge passed through the first drying unit And a second drying unit for drying the transferred intermediate dewatered sludge to produce final sludge.

In the present invention, it is a very important constitution to carry out the drying process by using the hybrid drying equipment, which is a drying equipment including two or more independent drying concepts. This is because, as a result of a number of experiments, it is found that, even if the same energy is used for the drying process in a single drying facility, the drying process is divided into two or more independent drying facilities to lower the energy consumption rate per moisture removal Because they found it.

According to a preferred embodiment of the present invention, the waste heat generator of the present invention is preferably a heat exchanger for recovering the heat source of the exhaust gas generated in the second drying unit, a waste heat generator for generating electricity utilizing the recovered waste heat, And a recovering unit for recovering waste heat generated at the time of power generation and supplying the recovered waste heat to the heat source of the first drying unit.

According to a preferred aspect of the present invention, the sludge gas fueling plant of the present invention may preferably comprise a gasification furnace for gasifying the final sludge produced in the hybrid drying plant and a secondary combustion chamber for burning the gasified fuel .

According to a preferred embodiment of the present invention, the flue gas treating facility of the present invention preferably includes a flue gas transfer part for transferring the flue gas generated in the second drying part to the flue gas treating facility, and a flushing tower for treating the flue gas Can,

More preferably, after the flue gas generated in the second drying unit is utilized in the waste heat power plant or the flue gas is directly transferred to the flue gas treating facility or the flue gas is utilized in the first drying unit, And a cleaning tower for treating the exhaust gas attracted and the attracted exhaust gas.

In the present invention, it is very important to utilize the flue gas in the drying process of the first drying unit. This is because the energy consumption rate per sludge water removal in the whole process can be remarkably lowered by the energy recycling process described above.

According to a preferred aspect of the present invention, the malodor removing equipment of the present invention may preferably include a collecting part and a deodorizing part.

According to another aspect of the present invention, there is provided a process for producing a dewatered sludge, comprising the steps of: (a) receiving an initial dewatering sludge, dehydrating it after oxidation treatment to reduce the volume and weight of the first dewatering sludge, step; And (b) drying the intermediate dewatered sludge of step (a) to produce final sludge, wherein the final sludge having a water content of 0.00001-10% is produced. The energy consumption per sludge water removal rate (kcal / kg _{water removal} ) is 400-600 kcal / kg _{moisture removal} .

According to still another aspect of the present invention, there is provided a method for preparing a dewatered sludge, comprising: (a) an oxidation dewatering step of receiving an initial dewatering sludge, dewatering the dewatering sludge after oxidation treatment to reduce the volume and weight and moisture content of the original dewatering sludge; And (b) drying the intermediate dewatered sludge of step (a) to produce final sludge, wherein the sludge drying system discharges an exhaust gas of 0.00001-2 ppm of ammonia.

According to still another aspect of the present invention, there is provided a method for preparing a dewatered sludge, comprising: (a) an oxidation dewatering step of receiving an initial dewatering sludge, dewatering the dewatering sludge after oxidation treatment to reduce the volume and weight and moisture content of the original dewatering sludge; And (b) a hybrid drying step of drying the intermediate dewatered sludge of step (a) to produce final sludge.

According to a preferred embodiment of the present invention, the drying of the present invention may preferably be performed using sludge gas fuel generated through a sludge gas fueling facility using final sludge produced by the hybrid drying step as an energy source .

According to a preferred embodiment of the present invention, the oxidative dehydration step and the hybrid drying step of the present invention are preferably carried out by using the waste heat generated in the drying step in the hybrid drying step, It may be supplied.

According to a preferred embodiment of the present invention, the exhaust gas generated during the hybrid drying step of the present invention may preferably be treated in an exhaust gas treatment facility after being used in the waste heat power plant.

The features and advantages of the present invention are summarized as follows:

(a) The present invention relates to an oxidation dewatering equipment for receiving an initial dewatering sludge, dewatering it after oxidation treatment to reduce the volume, weight and moisture content of the first dewatering sludge to produce intermediate dewatering sludge, A hybrid drying facility for drying the dewatered sludge to produce final sludge, a waste heat generation facility for producing electricity and heat using waste heat of the flue gas generated during the drying process in the hybrid drying facility, a final sludge A sludge gas fueling facility for gasifying and using the sludge gas as an energy source for the drying process through a combustion chamber, an exhaust gas treatment facility for treating the exhaust gas discharged after the waste heat of the exhaust gas generated during the drying process, Low-energy sludge drying with odor removal equipment It provides ryohwa system.

(b) According to the present invention, a sludge moisture content is removed through a first drying unit in a hybrid drying plant, and a dry matter having a moisture content of 10% or less is produced through a combined dryer to minimize an energy consumption rate per moisture removal. Is removed by the use of the odor combustion chamber inside the second drying unit, which is an excellent effect in removing odors.

(c) The present invention can simultaneously satisfy the sludge disposal cost and the energy saving effect by converting the dried material produced through the hybrid drying equipment into gasified fuel.

(d) The present invention is capable of reusing and producing energy by producing electricity and heat in a waste heat power generation facility using waste heat of an abandoned flue gas.

(e) The present invention contributes to maintenance of a pleasant environment by removing odorous substances and harmful elements flowing out to the atmosphere through an exhaust gas treatment facility and a malodor removal facility.

1 shows a process drawing showing the system of the present invention.
Fig. 2 shows the water content change in the oxidation-dehydration plant of the present invention.
Fig. 3 shows changes in water content and flue gas temperature in the first drying section of the present invention.
Fig. 4 shows changes in water content and net energy consumption rate per moisture removal in the second drying section of the present invention.
Fig. 5 shows the net energy consumption rate per moisture removal in the entire process of the present invention.
6 shows a process drawing of the second drying unit.
7 shows a cross-sectional view of the unit drying apparatus.
Figure 8 shows the main configuration of the stirring paddles included in the unit drying apparatus.
9 shows a main configuration of the second drying unit.
10 shows the flow of hot air and sludge in the second drying section.
Figure 11 shows a sludge dryer that is a component included in the present invention.
12 to 14 show a hot air distributor which is a constitution included in the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a process diagram of a low-energy sludge drying fueling system according to an embodiment of the present invention.

As shown in FIG. 1, the low-energy sludge drying fueling system of the present invention includes an oxidation dewatering apparatus 100 for receiving an initial dewatering sludge, dewatering it after oxidation treatment to reduce the volume, weight and moisture content of the first dewatering sludge to produce intermediate dewatering sludge, A hybrid drying equipment 200 for drying the intermediate dewatered sludge whose moisture content is reduced by the oxidative dewatering equipment to produce final sludge, and a hybrid drying equipment 200 for producing electricity and heat using the waste heat of the flue gas generated during the drying process in the hybrid drying equipment A sludge gas fueling facility 300 for gasifying the final sludge produced by the hybrid drying equipment 200 and using the final sludge as an energy source for the drying process through a combustion chamber, An exhaust gas treatment facility 500 for treating exhaust gas discharged after using waste heat, And a malodor removing apparatus 600 for removing malodor substances. It also includes a control facility for each process and an entire process control facility 700.

Each facility will be described in more detail below.

Low energy Sludge  Dry fueling system

Configuration 1: Oxidation and dehydration facility (100)

The sludge introduced into the oxidation and dewatering unit 100 is stored in the storage unit 110 and then is transported to the oxidation flocculation unit 140 by the transfer unit 120 after staying for a predetermined period. In the oxidized flocculating part 140, the sludge transferred by the transfer part 120 and the oxidizing flocculating agent (iron salt, calcium oxide, polymer flocculant, sodium hydroxide, etc.) are mixed to cause oxidation and flocculation. Various oxidation coagulants can be used as oxidant coagulants. The oxidized agglomerated sludge is introduced into the dewatering unit 150. The dewatering unit 150 uses a filter press dehydrator type and the dewatered dewatering cake is transferred to the hybrid drying equipment 200 with a moisture content of 50 to 68%.

The dehydrated desalted liquid is transferred to the desalination liquid storage portion 160. Some of the desorption liquid stored in the desorption liquid storage 160 is transferred to the oxidation coagulation bath and a portion of the desorption liquid is sent to the front end of the wastewater treatment plant. If the wastewater treatment plant is not nearby, it may be removed by evaporation using waste heat generated during drying and flue-gas treatment.

Configuration 2: Hybrid Drying Equipment (200)

The dewatered cake having a water content of 50 to 68% introduced into the hybrid drying equipment 200 is conveyed to the first drying unit 210 through the conveyor. In the first drying unit 210, the introduced dehydrated cake is injected into the upper part and discharged to the lower part. The high-temperature exhaust gas generated during the drying process and the middle-low-temperature exhaust gas generated during the waste heat generation flow into the lower part, The water content in the dehydrated cake is reduced to 40 to 55% by reducing the water content of the dehydrated cake in which the waste heat included in the upper part flows. The dewatered cake having reduced water content is crushed into fine particles in the crushing part 220 and then supplied to the second drying part 240 by the fixed amount supplying part 230.

The inside of the second drying unit 240 is divided into a multi-stage paddle to which the sludge is conveyed, and a combustion path, a malodor combustion chamber, and a drying chamber, which are transfer paths of the heat source. The sludge introduced into the multi-stage paddles is discharged into a dried product having a moisture content of 10% or less, and the discharged dried product is transferred to the sludge gas fueling facility 300 by the transfer device.

In the odor combustion chamber, the odorous substances generated during drying are introduced and removed. In the drying chamber, the moisture content of the sludge in the paddle is reduced by the heat transfer between the sludge and the flue gas in the paddle. The exhaust gas of the second drying unit is discharged to the waste heat power generation facility 400.

Configuration 2-1: First drying unit 210:

11 to 14, a sludge dryer 70 included in the first drying unit 210 according to an embodiment of the present invention includes a sludge drying case 71, a dehydrating sludge inlet 72, A hot air discharge port 75-1, a hot air discharge port 75-2, a hot air discharge lid 75-3 and a dispersion lid supporter 75-4. A drying sludge discharge portion 77 including a distribution portion 75, a drying sludge discharge port 76, a drying sludge discharge conveyor 77-1 and a door 77-2, a sludge flat portion 78, 79-1 and a heating part 79-7.

The sludge dryer 70 will be described in more detail below.

The dewatered sludge discharged through the sludge dewatering device 10 is crushed to a predetermined size by the dewatering sludge crushing part 73 attached to the dewatering sludge input port 72 and then introduced into the drying case 71 of the sludge dryer 70 And the sludge flat portion 78 provided on the upper side of the drying case 71 is rotated so that the dewatered sludge is not accumulated in one direction inside the drying equipment so that hot air rising from the lower portion is evenly distributed.

The hot air supplied from the external hot air supply device is supplied to the hot air supply port 75-1 through the hot air supply pipe inside the drying equipment, The supplied hot air is uniformly dispersed into the sludge dryer 70 through the hot air distribution cistern 75-7 and the hot air dispersion cistern 75-3 and passes through the fine air gap between the dewatered sludge Dry through heating.

The hot airflow distributing shovel 75-3 is made to have a width sufficiently larger than the outlet of the hot air distribution dispenser 75-7 and the end is extended to a position lower than the outlet of the hot air distributing trough 75-7, The dewatering sludge that moves downward from the bottom of the dryer prevents the outlet of the hot air distribution dispenser 75-7 from being closed, and has the function of evenly distributing the supplied hot air to the entire lower portion of the dryer.

The flue gas generated after drying the dehydrated sludge is discharged to the atmosphere through the flue gas outlet 74 in the upper part of the dryer, the treated flue gas in the downstream stage, and the treated flue gas.

In addition, a door 77-7 is installed in the drying sludge discharge port 76 to prevent hot air from escaping to the discharge port at the lower part of the drying facility.

A predetermined amount of dried sludge in the sludge dryer (70) is taken out to the outside alternately in accordance with the series. The semi-finished product is taken out through the drying sludge discharge conveyor 77-1 and the lower drying sludge conveying conveyor, at which time the door 77-7 is opened and the hot air supply is stopped.

Sludge Dryer 70 The sludge drying case 71 includes a heating unit 79 including a heating jacket 79-1 and a thermal insulator 79-7, The hot water is injected into the heating jacket outside the drying equipment so that the heat is transferred to the inside of the drying equipment so that the direct drying is performed by hot air and the combined drying is performed by indirect heating by hot water.

Composition 2-2: Second drying section 240:

6 to 10 are process charts of the second drying unit 240 according to the embodiment of the present invention and sectional views of the unit drying apparatus 1 are shown in perspective view of the stirring paddles 62 included in the unit drying apparatus 1 And the second drying unit 100 are shown.

6 to 10, a second drying unit 240 according to an embodiment of the present invention includes a duct 10, a hot air inflow port 20, a wastewater sludge inflow port 30, a hot air outflow port 40, A unit drying apparatus 1 including an sludge outlet 50 and a wastewater sludge conveying unit 60 including a central shaft 61, a stirring paddle 62 and a reverse paddle 63, an outer case 2, The hot air distributing pipe 5, the hot air distributing pipe 5-1, the thermal deformation preventing connecting member 5-2, the hot air adjusting unit 6, the gas discharging unit 5, A dust collector 8, a centrifugal dust collector 8-1, a filter 8-2, and a sludge discharge valve 9 as shown in FIG.

The second drying unit 240 removes dewatered sludge introduced into the wastewater sludge inlet 30 from the outer case 2 which is thermally insulated by refractory bricks and cemented tanks and a unit drying device 1 and the dewatered sludge introduced into the wastewater sludge inlet 30 is transferred to the left and right zigzags according to the operation flow of the unit drying apparatus 1 to be dried and discharged.

The unit drying apparatus 1 includes a duct 10, a hot air inflow port 20, an open / close sludge inflow opening 30, a hot air outflow port 40, a wastewater sludge outflow port 50 and a center shaft 61, ) And a reverse paddle (63).

The duct 10 flows the drying hot air directly to the interior of the duct to dry the dehydrated sludge contained in the duct, and the dehydrated sludge contained in the duct is dried by indirect drying hot air flowing outside the duct The conduit is made of a metal with high thermal conductivity.

The hot air inflow port 20 is formed at one side of the duct to directly introduce dry hot air into the duct. The hot air inflow port 20 may be provided with a hot air adjusting unit 6 to be described later to adjust the amount of the direct drying hot air.

The direct drying hot air introduced into the hot air inlet 20 moves in a zigzag manner as the direction of the dewatering sludge advances and dries the dewatered sludge.

The wastewater sludge inlet (30) is formed at one side of the conduit and serves to introduce the dehydrated sludge into the conduit.

The dewatered sludge introduced into the wastewater sludge inlet 30 is dried and discharged while being conveyed in left and right zigzags according to the operation flow of the unit drying apparatus 1.

The hot air outlet 40 is formed on the other side of the duct to discharge the wet exhaust gas generated directly after drying to the outside of the duct.

The wastewater sludge outlet (50) is formed at the other side of the conduit to discharge the dry sludge to the outside of the conduit.

Here, the hot air inlet 20, the wastewater sludge inlet 30, the hot air outlet 40, and the wastewater sludge outlet 50 may form separate outlets for the pipeline 10, It can also be used.

The wastewater sludge transferring part 60 serves to transfer the dewatered sludge contained in the pipeline from one side of the pipeline to the other side and includes a central shaft 61, a stirring paddle 62 and a reverse paddle 63).

The wastewater sludge conveying unit 60 is provided with a plurality of stirring paddles 62 mounted at a predetermined angle along the central axis 61 in the direction of tilt so as to effectively evaporate moisture by the direct heat of the drying hot wind and the sludge in the process of transferring the dewatered sludge. .

In order to smoothly stir the sludge in the high viscosity region and to perform convenient maintenance of the worn portion, an auxiliary pad (64) is attached to the paddle blade finishing portion of the stirring paddle (62) The stirring paddles 62 allow the reverse paddles 63 to be attached to the inclination of the other stirring paddles in the direction opposite to the inclination so that the problem of clogging of the sludge does not occur.

The unit drying device 1 is constructed of a material resistant to abrasion and heat so as to prevent abrasion due to friction between the central shaft 61 and the stirring paddle 62 and the duct 10, Titanium or the like.

In this case, the unit drying apparatus 1 may be arranged in the upper and lower portions of the second drying unit so that the hot air outlet 40 and the waste water sludge The outlet 50 is connected to the hot air inlet 20 and the wastewater sludge inlet 30 included in the other unit drying apparatus 1 to increase the drying efficiency of the dewatered sludge.

The unit dryer (1) is divided into separate power transmission devices and operated separately, and a speed control device is provided to easily cope with fluctuation of sludge load.

The outer case (2) includes a unit drying device (1) arranged vertically in the up and down direction, and can be manufactured by heat-treating refractory bricks and caustables.

The malodor burning unit 3 is located inside the outer case 2 and heats the wet exhaust gas generated by the direct drying hot air directly in contact with the dewatered sludge in the unit drying apparatus 1 to be included in the wet exhaust gas. And burns odor components and contaminants, and at the same time, generates the first dry hot air used for drying dehydrated sludge.

The circulating blowing unit 4 circulates the wet exhaust gas generated by the direct contact with the dehydrating sludge to the malodor burning unit 3.

The hot air distribution unit 5 is provided with a hot air distribution pipe 5-1 inside the outer case 2 to minimize heat loss and to dry the first dry hot air generated from the odorous combustion unit 3 by the unit drying The hot air flows directly into the apparatus 1 and the indirect drying hot air flows to the outside of the unit drying apparatus 1,

Since the hot air distribution unit 5 is installed inside the outer case 2 of the second drying unit, the thermal deformation preventing connection unit 5-2 can be mounted to prevent contraction and expansion due to high temperature that may occur during operation .

Here, in the hot air distribution portion 5, the hot air controlling portion 6 can be installed in the hot air inlet 20 and the gas discharging portion 7 for controlling the injection amount of the direct drying hot air and the indirect drying hot air.

The hot air control unit 6 controls the amount of the direct drying hot air and the indirect drying hot air dispensed from the hot air distributor 5 and more specifically controls the amount of the hot air introduced into the hot air inflow port 20 and the gas discharging unit 7 The hot wind control unit 6 is provided to regulate the amount of hot wind to be dispensed.

The gas discharge unit 7 serves to discharge the cooled dry cooling gas after heating the pipeline 10 included in the unit drying apparatus 1 inside the outer case 2 by indirect drying hot air, The discharged dry cooling gas may be transferred to a process where the remaining heat source is available.

The dust collector 8 includes a centrifugal dust collector 8-1 and a dust collector 8-2 and collects dust contained in the wet exhaust gas.

The direct drying hot air directly injected into the unit drying apparatus 1 is discharged to the wet exhaust gas in the process of directly drying the dehydrated sludge, and is then input to the centrifugal force dust collector 8-1.

The wet exhaust gas introduced into the centrifugal force dust collector 8-1 separates the fine drying sludge contained in the gas and discharges it through the lower rotary valve.

The filter / dust collector 8-2 is installed to remove particulate matters smaller than the fine sludge sludge primarily filtered by the centrifugal force dust collector 8-1.

The filtration and dust collector 8-2 periodically performs pulp bleaching using compressed air to prevent performance deterioration caused by clogging of the filter fabric, and discharges fine drying sludge attached to the filter fabric through the lower rotary valve desirable.

The sludge discharge valve 9 regulates the discharge amount of the drying sludge of the final stage drying apparatus of the unit drying apparatus 1 and cuts off the external FLASH AIR supply. ). &Lt; / RTI &gt;

Configuration 3: Sludge gas  Fueling plant (300)

The dry matter generated in the hybrid drying equipment 200 is transferred to the sludge gas fueling facility 300. The transferred dried material is gasified in the gasification furnace 310 and transferred to the secondary combustion chamber 320, and then used as fuel for combustion of the second drying section.

Composition 4: Cogeneration facility (400)

The temperature of the exhaust gas generated in the hybrid drying facility 200 is 180 to 300 and is transferred to the waste heat generation facility 400 as a downstream process. A portion of which can be transferred to the first drying unit 210 and used to directly reduce the sludge moisture content.

The waste gas containing waste heat at a high temperature is transferred to the heat exchanger 410 of the waste heat generation facility to produce electricity by expansion and condensation of the internal working fluid of the waste heat generator 420. The pump consists of a pump, an evaporator, an expander, and a condenser (heat recovery unit). The pump converts low-temperature, low-pressure, liquid-state working fluid into high-pressure liquid and transfers it to the heat exchanger 410. In the heat exchanger, heat exchange occurs between the waste heat of the high-temperature exhaust gas and the operating oil. Since the heat energy heats the working fluid having a low boiling point in the evaporator, the working fluid is converted into a gas of high temperature and high pressure. The converted high-temperature, high-pressure gas expands through the expander and generates a driving force to drive the generator to produce electricity. The working fluid that has passed through the expander is a medium-temperature, low-pressure gas and is converted into a low-temperature and low-pressure liquid by the condenser. The cycle circulates to produce electricity and produce heat.

Configuration 5: Flue gas treatment plant (500)

The exhaust gas passing through the waste heat generation facility 400 or the first drying unit 210 is transferred to the exhaust gas treatment facility 500 and treated with pollutants contained in the exhaust gas and then discharged to the atmosphere. The exhaust gas treatment facility is composed of an exhaust gas attracting unit (510, ID FAN) and a washing tower (520).

Composition 6: Odor Removal Facility (600)

The odor substances generated in the oxidation-dewatering facility 100 and the hybrid drying equipment 200 during the storage tank and the transfer of the cake are collected and processed by the malodor removal facility 600. The malodor removing apparatus comprises a collecting unit (610, collecting unit and deodorizing pan) and a deodorizing unit (620, deodorizing tower).

Configuration 7: Process control facility 700

In the process automatic control system, a power supply control and operation control button (not shown) is installed in one side of each device in the sludge drying fueling system, and a motor, an actuator, an igniter, It is composed of each unit and / or integrated control panel so that each facility can be controlled automatically or manually so that sludge can be dried and fueled by operating in conjunction with various instruments such as thermometer, flow meter, flow meter, calorimeter and gas analyzer.

Experimental Example

Experimental Example  1: Determination of water content of oxidative dehydration plant

FIG. 2 shows that the water content after oxidative dehydration was 61% (50 to 68%) on average, as a result of water content analysis in the oxidative dehydration plant.

Experimental Example  2: water content of the first drying part and Flue gas  Temperature measurement

FIG. 3 is a result of an experiment of the first drying unit 210, in which the average operation time is based on 3 hours, and the water content reduction rate in the first drying unit is confirmed. The average temperature of the flue gas discharged during 3 hours of operation is 43 (38 to 50) degrees Celsius. The average temperature of the flue gas is about 31% (11% to 55% It is confirmed that the water evaporates as the road is reduced to about 32 degrees Celsius (25 to 38 degrees).

Experimental Example  3: Water content and moisture removal of the second drying part Per use  calorimetry

4 is an experimental result of the second drying unit 240. FIG. Was the operating time of the dryer is operating on the basis of 12 hours, the water content of the drier operating time of 12 hours after the dried product has been identified as a 6% (4-9%), used per water removal amount of heat is 1,016 kcal / kg _{water removal} ( 946 to 1,101 kcal / kg _{water removal} ).

Experimental Example  4: Odor gas component measurement

Table 1 below shows the odorant substances in the exhaust gas discharged from the first drying unit 210 and the second drying unit 240 of the storage unit 110 and the intermediate sludge of the oxidation and dewatering equipment 100 and the hybrid drying equipment 200 The results are analyzed. The concentration of dimethyldisulfide was high in the dewatered feed sludge, but the concentration in the intermediate dewatered sludge was low and no odor substance except the ammonia in the flue gas was measured.

division Dehydrator inlet sludge middle
Sludge The first drying section
Flue gas The second drying unit flue gas Emission standard ammonia 0.02 0.01 0.02 0.06 1-2 Hydrogen sulfide
Methylmercaptine
Trimethylamine N.D. N.D. N.D. N.D. 0.002 to 0.06 Dimethyl
Sulfide 0.56 N.D. N.D. N.D. 0.01 to 0.05 Dimethyldie
Sulfide 11.28 0.02 N.D. N.D. 0.009-0.03

Unit: ppm

Unit drying unit 1 External case 2
Odor burning part 3 Circulation blowing part 4
Hot air distribution part 5 Hot air distribution pipe 5-1
Thermal deformation preventing connection part 5-2 Hot air control part 6
Gas discharge part 7 dust collector 8
Centrifugal Dust Collector 8-1 Filtration Dust Collector 8-2
Sludge discharge valve 9 conduit 10
Hot Air Inlet 20 Waste Water Sludge Inlet 30
Hot Air Outlet 40 Waste Water Sludge Outlet 50
Waste water sludge conveying section 60 Center axis 61
Stir paddles 62 reverse paddles 63
Auxiliary pad 64
Sludge dryer 70 Sludge drying case 71
Dewatered sludge inlet 72 Dewatered sludge crusher 73
Flue gas outlet 74 Hot air distribution part 75
Hot Air Supply Section 75-1 Hot Air Distribution Section 75-7
Hot Air Dispersion Drop 75-3 Dispersion Drop Support 75-4
Dry sludge discharge part 77 Dry sludge discharge conveyor 77-1
Door 77-7 Sludge flat portion 78
Heating part 79 Heating jacket 79-1
Insulation 79-7
Oxidation and dehydration apparatus 100 Storage unit 110
Transfer part 120 oxidized coagulant input part 130
Oxidized agglomerated portion 140 dehydrated portion 50
Desalination liquid storage unit 160 Hybrid drying facility 200
The first drying unit 210 and the crushing unit 220
Quantitative supply unit 230 Second drying unit 240
Sludge gas fueling facility 300 Gasification furnace 310
Secondary combustion chamber 320 Waste heat generation facility 400
Heat exchanger 410 Waste heat generator 420
Collector 430 Flue gas treatment facility 500
Flue Gas Injection Unit 510 Washing Tower 520
The odor eliminating apparatus 600 includes a collecting section 610
Deodorizer 620 Control equipment 700

Claims (10)

An oxidation dewatering facility for receiving the first dewatered sludge, dewatering the dewatered sludge, reducing the volume, weight and moisture content of the first dewatered sludge to produce intermediate dewatered sludge,
A hybrid drying facility for drying the intermediate dewatered sludge whose water content is reduced by the oxidative dewatering facility to produce final sludge,
A waste heat generation facility for generating electricity and heat by using waste heat of the flue gas generated during the drying process in the hybrid drying facility,
A sludge gas fueling facility for gasifying the final sludge produced by the hybrid drying facility and using it as an energy source for the drying process through the combustion chamber,
An exhaust gas treatment facility for treating the exhaust gas discharged after waste heat of the exhaust gas generated during the drying process,
A malodor removal facility for removing odor substances generated during the drying process,
And a process control facility for automatically or manually controlling the facilities of the substrate,
The oxidation dewatering equipment includes a storage unit for storing the first dewatered sludge loaded, a transfer unit for transferring the first dewatered sludge stored, an oxidant coagulant input unit, an oxidized coagulant for mixing the first dehydrated sludge and oxidant coagulant charged, And a desorption liquid storage unit for storing the desorption liquid generated in the dehydration unit,
The hybrid drying equipment includes a first drying unit for primarily drying the intermediate dewatered sludge using waste heat of the exhaust gas, a crushing unit for crushing the intermediate dewatered sludge passed through the first drying unit, a quantitative supply unit for feeding the crushed intermediate dewatered sludge, And a second drying unit for drying the transferred intermediate dewatered sludge to produce final sludge
Low energy sludge dry fueling system.
delete delete The method according to claim 1,
The waste heat generator includes a heat exchanger for recovering the heat source of the exhaust gas generated in the second drying unit, a waste heat generator for generating electricity by utilizing the recovered waste heat, a waste heat generator for recovering the waste heat generated in the waste heat generation, And a low-energy sludge drying fueling system.
The method according to claim 1,
Wherein the sludge gas fueling plant comprises a gasification furnace for gasifying the final sludge produced in the hybrid drying plant and a secondary combustion chamber for burning the gasified fuel.
The method according to claim 1,
Wherein the flue gas treating facility includes a flue gas transfer section for transferring the flue gas generated in the second drying section to the flue gas treating facility and a flushing tower for treating the flue gas to be transferred.
The method according to claim 6,
The exhaust gas treatment facility may be configured to use the exhaust gas generated in the second drying unit in the waste heat power plant or to transfer the exhaust gas directly to the exhaust gas treatment facility or utilize the exhaust gas in the first drying unit, And a scrubbing tower for treating the flue gas attracted from the flue gas desulfurizer.
The method according to claim 1,
Wherein the malodor removing equipment includes a collecting unit and a deodorizing unit.


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