Thermal power plant coal-containing wastewater treatment and coal slime dewatering and draining system and device

Abstract

The invention discloses a thermal power plant coal-containing wastewater treatment and coal slime dewatering and draining system and device, and relates to the technical field of thermal power plant coal-containing wastewater treatment.The thermal power plant coal-containing wastewater treatment and coal slime dewatering and draining system comprises a coal-water purification unit, a coal-water purification unit, a coal-water purification unit, a filtering pretreatment intermediate water tank, a multi-medium filter, a clean water tank and a coal slime dewatering and draining unit, the system comprises a wet coal slime storage bin, a continuous automatic high-pressure filter press, a dry coal slime spiral discharging machine, a dry coal slime storage bin, a closed coal yard, an automatic sludge scraping and sucking machine, a concentrated water tank, a coal slime centrifugal concentration device, an automatic chemical dissolving and adding device, a separation mechanism and a sedimentation tank, the dry coal slime finally collected by the closed coal yard can be transported to the closed coal yard to be recycled without being aired and dried outdoors, so that the problem that the storage and supply of fire coal are influenced is effectively solved, the environmental pollution is reduced, the working intensity is reduced, and the labor cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal-containing wastewater treatment in thermal power plants, and in particular to a system and device for treating coal-containing wastewater and dehydrating and filtering coal slime in thermal power plants. Background Art

[0002] The existing coal-containing wastewater treatment system primarily consists of a coal settling pond, a regulating pond, a clear water pond, two coal-water purification units (inclined tube sedimentation), two dosing units, two backwash pumps, three flushing pumps, and supporting coal-water transfer pumps and pipelines. The coal sludge filtration system primarily consists of a grabber positioned above the coal settling pond. The grabber periodically grabs the coal sludge from the coal settling pond and then air-dries it in the open air. After several days of drying, the sludge is then retrieved by a loader and returned to the coal yard for reuse. The coal settling pond requires cleaning several times a month.

[0003] The existing coal-containing wastewater treatment system uses long-term open-air drying of coal slime. To meet environmental protection requirements, the coal slime is captured and placed for 1-2 days to control water content before being transported back to a closed coal yard for drying. This increases the drying time of the coal slime, increases the time the coal storage site is occupied, reduces the inventory in the coal yard, and directly affects the storage and supply of fuel coal. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a coal-containing wastewater treatment and coal slime dehydration and filtration system and device for a thermal power plant, so as to solve the problem that in the prior art, the coal slime is dried in the open air for a long time. In order to meet environmental protection requirements, the coal slime is placed for 1-2 days after being captured to control the water, and then transported back to the closed coal yard to dry, which increases the drying time of the coal slime, increases the time the coal storage site is occupied, reduces the inventory in the coal yard, and ultimately leads to the problem of low coal storage and supply.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] Specifically, the first aspect is to provide a device for treating coal-containing wastewater and dehydrating and filtering coal sludge in a thermal power plant, comprising:

[0007] Coal water purification unit, which includes a regulating tank, an electronic flocculator, a coal water purification device, a filtration pretreatment intermediate water tank, a multi-media filter and a clear water tank;

[0008] Coal slime dewatering and drying unit, which includes wet coal slime storage bin, continuous automatic high-pressure filter press, dry coal slime spiral discharging machine, dry coal slime storage bin, closed coal yard, automatic scraper and suction machine, concentration water tank, coal slime centrifugal concentration device, automatic dissolving and dosing device, separation mechanism and sedimentation tank;

[0009] The sedimentation tank transports the coal-containing wastewater to the regulating tank by gravity, and the coal-containing wastewater in the regulating tank passes through the electronic flocculator, coal-water purification device, filtration pretreatment intermediate water tank, multi-media filter and clear water tank in sequence;

[0010] The automatic sludge scraper and suction machine is used to suck the sludge from the sedimentation tank and transport the sludge in sequence to the thickening water tank, the coal slime centrifugal thickening device, the wet coal slime storage bin, the continuous automatic high-pressure filter press, the dry coal slime spiral discharger, the dry coal slime storage bin and the closed coal yard.

[0011] As a further solution of the present invention: the coal water purification device includes an inclined tube assembly, a water distribution area, a clean water area, and a sludge hopper. The inclined tube assembly is a honeycomb tube bundle made of polypropylene, PVC or fiberglass, with an inclination angle of 40°-80°. The water distribution area is located at the bottom of the inclined tube assembly, the clean water area is located at the top of the inclined tube assembly, and the sludge hopper is located at the bottom of the water distribution area.

[0012] As a further solution of the present invention: the continuous automatic high-pressure filter press includes four piston cylinders, the output ends of the four cylinder sleeve cylinders are connected to piston rods, the ends of the piston rods away from the cylinder sleeve cylinders are fixedly connected to the upper filter plate, the outer side of the upper filter plate is nested with a filter press chamber, the upper filter cloth is connected to the upper filter plate, the bottom of the upper filter cloth is provided with a lower filter cloth conveyor belt, and the bottom of the lower filter cloth conveyor belt is provided with a lower filter plate.

[0013] As a further solution of the present invention: the automatic mud scraper and suction machine includes a mud suction system, a hanger, and a mud scraper. When the sedimentation tank has four grids, the hanger needs to be placed horizontally above two grid sedimentation tanks. The mud suction system includes multiple groups of mud suction pumps, and multiple groups of mud suction pumps are set for each grid sedimentation tank corresponding to the mud suction system.

[0014] As a further solution of the present invention: the coal slime centrifugal concentration device includes a drum, one end of the drum is coaxially connected to a reducer, the inner side of the reducer is connected to a screw conveyor, the top of the drum is connected to a motor through a coupling, a fixed end plate is provided on the top of the drum, a feed pipe is connected to the fixed end plate, one end of the feed pipe is connected to the output end of the coal slime lifting pump, and the feed pipe then transports the coal slime to the inside of the drum, a discharge port is opened on the fixed end plate, and a solid phase outlet is opened at the small end of the drum.

[0015] As a further solution of the present invention: the automatic dissolving and adding device is used to add flocculant into the coal slime centrifugal concentration device.

[0016] As a further solution of the present invention: the liquid material in the continuous automatic high-pressure filter press is transported to the sedimentation tank by gravity.

[0017] As a further solution of the present invention: the liquid material in the coal slime centrifugal concentration device is transported to the sedimentation tank by gravity.

[0018] As a further solution of the present invention: the sludge hopper is connected to the concentration water tank through a pipeline.

[0019] The second aspect is to provide a coal-containing wastewater treatment and coal slime dehydration and filtration system for a thermal power plant, including:

[0020] Coal water purification unit, which includes a regulating tank, an electronic flocculator, a coal water purification device, a filtration pretreatment intermediate water tank, a multi-media filter and a clear water tank;

[0021] Coal slime dewatering and drying unit, which includes wet coal slime storage bin, continuous automatic high-pressure filter press, dry coal slime spiral discharging machine, dry coal slime storage bin, closed coal yard, automatic scraper and suction machine, concentration water tank, coal slime centrifugal concentration device, automatic dissolving and dosing device, separation mechanism and sedimentation tank;

[0022] The DCS control module is used to monitor and control the coal water purification unit and the coal slime dehydration and drying unit in real time.

[0023] Beneficial effects of the present invention:

[0024] In the present invention, the separation mechanism is set up to intercept, collect, and clean the block particles larger than the screen gap particle size and then enter the sedimentation tank for primary sedimentation. The coal-water clear liquid after sedimentation flows to the regulating tank by gravity, and is then pumped to the electric flocculation device by the coal-water lifting pump. The flocculated coal-water is pumped to the coal-water purification equipment for sedimentation. The precipitated coal-water flows to the filtration pretreatment intermediate water tank by gravity, and is then pumped to the multi-media filter for further purification to meet the reuse standards and then reused.

[0025] In the present invention, the automatic high-pressure filter press, dry coal slime spiral discharger, automatic mud scraper and suction machine, concentration water tank and coal slime centrifugal concentration device are set up to realize automatic filtration and crushing of concentrated coal water and automatic transportation to the closed coal yard.

[0026] In the present invention, the DCS control module is set up to automatically control the coal water purification unit and the coal slime dehydration and filtration unit, realize automatic operation, meet the "unmanned" control standard, reduce work intensity, save labor costs, and improve the coal water purification effect and wastewater reuse rate.

[0027] In the present invention, the lower filter cloth conveyor belt of the continuous automatic high-pressure filter press transmits the squeezed dry mud cake to the dry coal slime spiral discharging machine, the dry coal slime spiral discharging machine crushes the dry mud cake and then transmits it to the dry coal slime storage bin, the discharge port of the dry coal slime storage bin is a lower-opening electric plug-in door or a lower-opening hydraulic plug-in door, which is regularly unloaded into the loader hopper and then transported to the closed coal yard. The dry coal slime finally collected in the closed coal yard does not need to be dried in the open air and can be transported to the closed recycling and use, which not only effectively solves the problems affecting the storage and supply of fuel coal, but also reduces environmental pollution, reduces work intensity, and saves labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1This is a flow chart of the device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant according to the present invention;

[0030] Figure 2 This is a flow chart of the coal-water purification unit in the coal-containing wastewater treatment and coal slime dehydration and drying device of a thermal power plant according to the present invention;

[0031] Figure 3 This is a flow chart of the coal slime dehydration and drying unit in the coal-containing wastewater treatment and coal slime dehydration and drying device of a thermal power plant according to the present invention;

[0032] Figure 4 It is a structural schematic diagram of the coal water purification device of the present invention;

[0033] Figure 5 It is a structural schematic diagram of the continuous automatic high-pressure filter press of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the automatic sludge scraper and suction machine in the present invention in conjunction with the sedimentation tank;

[0035] Figure 7 It is a structural schematic diagram of the automatic sludge scraping and suction machine of the present invention;

[0036] Figure 8 It is a structural schematic diagram of the coal slime centrifugal concentration device of the present invention;

[0037] Figure 9 This is a flow chart of the coal-containing wastewater treatment and coal slime dehydration and drying system of a thermal power plant according to the present invention;

[0038] Figure 10 It is a flow chart of the existing coal-containing wastewater treatment and coal slime dehydration and drying process system.

[0039] Explanation of reference numerals: 1. Coal-water purification unit; 11. Regulating tank; 12. Electronic flocculator; 13. Coal-water purification device; 131. Inclined pipe assembly; 132. Water distribution area; 133. Clean water area; 134. Sludge hopper; 14. Intermediate water tank for filtration and pretreatment; 15. Multi-media filter; 16. Clean water tank; 2. Coal slime dehydration and drying unit; 21. Wet coal slime storage bin; 22. Continuous automatic high-pressure filter press; 221. Piston cylinder; 222. Piston rod; 223. Upper filter plate; 224. Upper filter cloth; 225. Lower filter cloth conveyor belt; 226. Lower filter cloth conveyor belt Filter plate; 227, filter press chamber; 23, dry coal slime spiral discharger; 24, dry coal slime storage bin; 25, closed coal yard; 26, automatic scraper and suction machine; 261, suction system; 262, hanger; 263, scraper; 27, thickening water tank; 28, coal slime centrifugal thickening device; 281, drum; 282, screw conveyor; 283, reducer; 284, motor; 285, bracket; 286, fixed end plate; 287, feed pipe; 288, discharge port; 29, automatic dissolving drug dosing device; 210, separation mechanism; 211, sedimentation tank. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] Example 1

[0042] like Figures 1-8As shown, the present invention discloses a device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant, comprising a coal water purification unit 1, which includes a regulating tank 11, an electronic flocculator 12, a coal water purification device 13, a filtration pretreatment intermediate water tank 14, a multi-media filter 15 and a clear water tank 16, a coal slime dehydration and filtering unit 2, which includes a wet coal slime storage bin 21, a continuous automatic high-pressure filter press 22, a dry coal slime spiral discharger 23, a dry coal slime storage bin 24, a closed coal yard 25, an automatic scraper and suction machine 26, a concentrated water tank 27, a coal slime centrifugal concentration device 28, an automatic dissolving and dosing device 29, a separation mechanism 210 and a sedimentation tank 211, wherein the regulating tank 11, the electronic flocculator 12, the coal water purification device 13, the filtration pretreatment intermediate water tank 14, the multi-media filter 15 and the clear water tank 16, the coal slime dehydration and filtering unit 2, which includes a wet coal slime storage bin 21, a continuous automatic high-pressure filter press 22, a dry coal slime spiral discharger 23, a dry coal slime storage bin 24, a closed coal yard 25, an automatic scraper and suction machine 26, a concentrated water tank 27, a coal slime centrifugal concentration device 28, an automatic dissolving and dosing device 29, a separation mechanism 210 and a sedimentation tank 211. The material between the flocculator 12 and the coal-water purification device 13 is transported by pumping, the material between the coal-water purification device 13 and the filtration pretreatment intermediate water tank 14 is transported by gravity, the material between the filtration pretreatment intermediate water tank 14 and the multi-media filter 15 is pumped, the material between the multi-media filter 15 and the clear water tank 16 is transported by gravity, the material between the wet coal slime storage bin 21 and the continuous automatic high-pressure filter press 22 is pumped, the material between the continuous automatic high-pressure filter press 22, the dry coal slime spiral discharger 23 and the dry coal slime storage bin 24 is transported by a conveyor belt, and the liquid material in the continuous automatic high-pressure filter press 22 is transported to the sedimentation tank 211 by gravity;

[0043] The automatic sludge scraper 26 is arranged inside the sedimentation tank 211. The automatic sludge scraper 26 transports the material inside to the concentration water tank 27 by pumping and gravity. The concentration water tank 27 transports the material barrel inside to the coal slime centrifugal concentration device 28 by pumping. The material in the coal slime centrifugal concentration device 28 is transported to the wet coal slime storage bin 21 and the sedimentation tank 211 respectively by gravity.

[0044] The automatic dissolving and dosing device 29 adds flocculants into the coal slime centrifugal concentration device 28, wherein the flocculants are inorganic flocculants, organic polymer flocculants, composite flocculants or biological flocculants. The positively charged flocculants neutralize the negative charges on the surface of the colloidal particles in the coal slime centrifugal concentration device 28, reducing the repulsive force. In this way, the long-chain polymers will adsorb multiple particles to form a network of flocs, which will settle together.

[0045] The materials between the separation mechanism 210 and the sedimentation tank 211 are transported by gravity, and the coal-containing wastewater can be transported to the separation mechanism 210 by gravity. The separation mechanism 210 can intercept, collect, and clean the block particles larger than the screen gap particle size and then enter the sedimentation tank 211 for primary sedimentation, where most of the coal powder is precipitated. The coal-water clear liquid after precipitation in the sedimentation tank 211 flows by gravity to the regulating tank 11 and is temporarily stored in the regulating tank 11. It should be noted that the separation mechanism 210 is a rotary drum fine screen or a vibrating screen, which can be selected by those skilled in the art according to actual needs.

[0046] The coal-water clear liquid temporarily stored in the regulating tank 11 can be transported to the electronic flocculator 12 by a pump. The electronic flocculator 12 can be expanded by those skilled in the art as needed. Specifically, multiple electronic flocculators 12 can be set in parallel to increase the coal-water treatment capacity. The number of electronic flocculators 12 set can be adaptively adjusted by those skilled in the art according to the treatment capacity of the electronic flocculator 12 and the coal-water treatment capacity that needs to be increased. The electronic flocculator 12 adopts electrochemical treatment technology, specifically, through electrolysis reaction, in situ generation of flocculants and removal of pollutants in the coal-water clear liquid. When in use, the anode in the electronic flocculator 12 can be selected as a soluble metal such as iron or aluminum. In this way, when the electronic flocculator 12 is connected to a DC power supply, under the action of the DC power supply, the anode undergoes an oxidation dissolution reaction, which can release Fe 2+ / Fe 3+ (When the anode is iron) or Al 3+ (When the cathode is aluminum) and other metal ions, these metal ions react with the OH generated by the cathode electrolysis of water in the electronic flocculator 12. - Combined to form flocculent hydroxides such as Fe(OH)3 or Al(OH)3, and then the flocculent hydroxides gather colloids, suspended solids and heavy metals in the coal-water clear liquid through neutralization and adsorption bridging, forming flocs and then precipitating. In this process, there is no need to add any chemical agents to flocculate the tiny particles of coal powder, resulting in a small amount of sludge and low water content of the sludge;

[0047] After flocculation and sedimentation, the coal water clear liquid is pumped to the coal water purification device 13, and the coal water purification device 13 performs inclined tube sedimentation on the coal water clear liquid. Figure 4 As shown, the coal water purification device 13 includes an inclined pipe assembly 131, a water distribution area 132, a clean water area 133, and a sludge hopper 134. The inclined pipe assembly 131 is a honeycomb tube bundle made of polypropylene, PVC or fiberglass, with an inclination angle of 40°-80°. Figure 4 The inclined tube assembly 131 corresponds to a honeycomb tube bundle with an inclination angle of 45°, wherein the water distribution area 132 is located at the bottom of the inclined tube assembly 131, the clean water area 133 is located at the top of the inclined tube assembly 131, and the sludge hopper 134 is located at the bottom of the water distribution area 132. The inclined tube assembly 131 can be replaced by an inclined plate assembly, which is a parallel plate group made of polypropylene, PVC or fiberglass, and has an inclination angle of 40°-80°. It should be noted that the coal water purification device 13 can also be replaced by a vertical flow bottom sinking tower;

[0048] The coal water in the clean water area 133 is transported to the filtration pretreatment intermediate water tank 14 by gravity. The filtration pretreatment intermediate water tank 14 then transports the coal water inside it to the multi-media filter 15 through a pump. The multi-media filter 15 further purifies the coal water and then transports it to the clean water tank 16 through a pump. The multi-media filter 15 is expanded by those skilled in the art according to actual needs. Specifically, multiple multi-media filters 15 can be set in parallel to increase the coal water treatment capacity. The number of multi-media filters 15 is set by those skilled in the art according to the treatment capacity of the multi-media filter 15 and the coal water treatment capacity that needs to be increased. It should be noted that the multi-media filter 15 includes a filter tank body, which is provided with a filter material layer, a supporting layer, a water distribution system, a water collection system and a backwash system, wherein the filter tank body is composed of an anti-corrosion material, the filter material layer includes at least three layers of media, and the three layers of media are anthracite, quartz sand and magnetite, and the supporting layer is composed of pebbles or gravel. The water distribution system is used to receive coal water in the clean water area 133 and transport the coal water to the filter material layer. The coal water will form clean water after passing through the filter material layer and the supporting layer. The water collection system is arranged at the bottom of the supporting layer for collecting clean water and transporting the clean water to the clean water tank 16 through a pump.

[0049] The coal water purification device 13, the continuous automatic high-pressure filter press 22, the dry coal slime spiral discharger 23, the automatic sludge scraper and suction machine 26, the coal slime centrifugal concentration device 28 and the separation mechanism 210 are all made of 2205 duplex stainless steel, which effectively prevents equipment corrosion damage caused by high chloride ion content.

[0050] Example 2

[0051] like Figure 6 and Figure 7As shown, the automatic sludge scraper 26 includes a sludge suction system 261, a hanger 262, and a sludge scraper 263. When the sedimentation tank 211 has four grids, the hanger 262 needs to be placed horizontally on the two grid sedimentation tanks 211. The hanger 262 can move on the two grid sedimentation tanks 211. The specific movement method is adaptively selected by those skilled in the art according to the size of the space between the hanger 262 and the two grid sedimentation tanks 211. The sludge suction system 261 includes multiple groups of sludge suction pumps. Each grid sedimentation tank 211 corresponding to the sludge suction system 261 is provided with multiple groups of sludge suction pumps. For example, four groups of sludge suction pumps are provided. In this way, the sludge suction system 261 has eight groups of sludge suction pumps, and the eight groups of sludge suction pumps are symmetrically distributed in the two grid sedimentation tanks 211. During the movement of the automatic scraper and suction sludge machine 26, the scraper blade 263 can scrape the inner wall of the sedimentation tank 211, and the sludge suction system 261 sucks out the coal sludge in the sedimentation tank 211 and transports it to the concentrated water tank 27 through pipes and trenches. The automatic scraper and suction sludge machine 26 can operate synchronously in the two sedimentation tanks 211, or can realize alternating circulation and sludge discharge in the two sedimentation tanks 211. The automatic scraper and suction sludge machine 26 can realize automatic walking and automatic reciprocating circulation, adjust the reciprocating working cycle of the driving according to the concentration of the coal sludge deposited at the bottom, and can also be linked with the water inlet of the sedimentation tank 211. The running and static control states of the automatic scraper and suction sludge machine 26 are reasonably set, and are specifically controlled by the electronic control mechanism;

[0052] A coal slime lift pump and a submersible agitator are provided inside the concentration water tank 27. The coal slime lift pump can pump the coal slime inside the concentration water tank 27 to the coal slime centrifugal concentration device 28. At least two submersible agitators are also provided inside the concentration water tank 27. The submersible agitators are used to stir the coal slime inside the concentration water tank 27 to prevent the coal slime from settling to the bottom of the concentration water tank 27 and becoming hardened, making it impossible for the coal slime lift pump to extract it.

[0053] Example 3

[0054] like Figure 8As shown, the coal slime centrifugal concentrating device 28 is a spiral unloading sedimentation centrifuge, which includes a drum 281. One end of the drum 281 is coaxially connected to a reducer 283, and the inner side of the reducer 283 is connected to a screw conveyor 282. The top of the drum 281 is connected to a motor 284 through a coupling. The output shaft of the motor 284 can transmit power to the drum 281 through the coupling, driving the drum 281 to rotate. The rotating drum 281 can also drive the screw conveyor 282 to rotate. A fixed end plate 286 is provided on the top of the drum 281. A bracket 285 is fixedly connected to the fixed end plate 286. The motor 284 is also fixed to the bracket 285 by bolts. The bracket 285 is fixed to the ground or other planes that can support the high-speed rotation of the drum 281 by bolts. A feed pipe 287 is connected to the fixed end plate 286. One end of the feed pipe 287 It is connected to the output end of the coal slime lifting pump, so that the coal slime lifting pump can transport the coal slime to the feed pipe 287, and the feed pipe 287 then transports the coal slime to the inside of the drum 281. The drum 281 is composed of a high-speed rotating conical or cylindrical conical component, and a drain port 288 is provided on the fixed end plate 286. The small end of the drum 281 is provided with a solid phase outlet, wherein the liquid phase outlet is used to discharge the clarified liquid, and the solid phase outlet is used to discharge the dehydrated solid. During use, after the coal slime enters the interior of the drum 281, when the drum 281 rotates at a high speed, the coal slime is subjected to the action of centrifugal force, and the solid particles with higher density settle to the inner wall of the drum 281, and the screw conveyor 282 can push the settled solids to the small end position and discharge them from the solid phase outlet. At the same time, the liquid overflows to the large end and is discharged through the drain port 288. The continuous operation of the coal slime centrifugal concentration device 28 can achieve the purpose of continuous separation of the coal slime.

[0055] It should also be noted that the automatic dissolving drug dosing device 29 is arranged on the top of the coal slime centrifugal concentrating device 28. The automatic dissolving drug dosing device 29 includes a drug feeding machine, a drug soaking machine and a dilution device. The automatic dissolving drug dosing device 29 can add flocculants into the coal slime centrifugal concentrating device 28. The coal-containing concentrate treated by the coal slime centrifugal concentrating device 28 enters the wet coal slime storage bin 21 by gravity.

[0056] Example 4

[0057] like Figure 5As shown, the wet coal slime storage bin 21 pumps the coal-containing concentrate into the continuous automatic high-pressure filter press 22 through the filter press feed pump. The continuous automatic high-pressure filter press 22 includes four piston cylinders 221. The output ends of the four piston cylinders 221 are connected to piston rods 222. The ends of the piston rods 222 away from the piston cylinders 221 are fixedly connected to the upper filter plate 223. The outer side of the upper filter plate 223 is nested with a filter press chamber 227. The upper filter plate 223 is connected to an upper filter cloth 224. The upper filter cloth 22 4 is provided with a lower filter cloth conveyor belt 225 at the bottom, and a lower filter plate 226 is provided at the bottom of the lower filter cloth conveyor belt 225. When working, the wet coal slime storage bin 21 first pumps the coal-containing concentrated liquid into the filter press chamber 227 through the filter press feed pump, and then the continuous automatic high-pressure filter press 22 is turned on. The piston rod 222 in the four piston cylinders 221 extends and pushes the piston downward. The downward piston rod 222 acts on the upper filter plate 223, so that the upper filter plate 223 cooperates with the lower filter plate 226. , so that the upper filter plate 223 and the lower filter plate 226 can squeeze the coal-containing concentrate inside them through the upper filter cloth 224 and the lower filter cloth conveyor belt 225 respectively, and the filter press chamber 227 can prevent the coal-containing concentrate from overflowing. Therefore, the liquid in the coal-containing concentrate can be squeezed out through the upper filter cloth 224 and the lower filter cloth conveyor belt 225, so that the coal-containing concentrate forms a dry mud cake. After the squeezing operation of the coal-containing concentrate is completed, the piston rod 222 in the four piston cylinders 221 retracts, so that the upper filter plate 223 is The upper filter cloth 224 will be driven to separate from the dry mud cake, and the dry mud cake will stay on the top surface of the lower filter cloth conveyor belt 225 due to its own gravity. In this way, when the lower filter cloth conveyor belt 225 moves, the lower filter cloth conveyor belt 225 will drive the dry mud cake on its top surface, so that the dry mud cake is separated from between the upper filter plate 223 and the lower filter plate 226, so that the upper filter plate 223 and the lower filter plate 226 can squeeze the coal concentrate again, realizing the function of continuous automatic high-pressure filter press 22 to continuously filter the coal concentrate.

[0058] The lower filter cloth conveyor belt 225 of the continuous automatic high-pressure filter press 22 transfers the squeezed dry mud cake to the dry coal slime spiral discharging machine 23. The dry coal slime spiral discharging machine 23 crushes the dry mud cake and then transfers it to the dry coal slime storage bin 24. The discharge port of the dry coal slime storage bin 24 is a lower-opening electric plug-in door or a lower-opening hydraulic plug-in door. It is regularly unloaded into the loader hopper and then transported to the closed coal yard 25. The dry coal slime finally collected in the closed coal yard 25 can be transported to a closed recycling facility without the need for open-air drying. This not only effectively solves the problems affecting coal storage and supply, but also reduces environmental pollution, reduces work intensity, and saves labor costs.

[0059] Example 5

[0060] like Figures 1-9As shown, the present invention discloses a coal-containing wastewater treatment and coal slime dehydration and filtration system for a thermal power plant, comprising a coal water purification unit 1, which includes a regulating tank 11, an electronic flocculator 12, a coal water purification device 13, a filtration pretreatment intermediate water tank 14, a multi-media filter 15 and a clear water tank 16; a coal slime dehydration and filtration unit 2, which includes a wet coal slime storage bin 21, a continuous automatic high-pressure filter press 22, a dry coal slime spiral discharger 23, a dry coal slime storage bin 24, a closed coal yard 25, an automatic scraper and suction machine 26, a concentration water tank 27, a coal slime centrifugal concentration device 28, an automatic dissolving and dosing device 29, a separation mechanism 210 and a sedimentation tank 211; and a DCS control module 3, which is used to monitor and control the coal water purification unit in real time. 1 and the coal slime dewatering and drying unit 2. It should be noted that the DCS control module 3 pre-sets the operating parameters of the coal water purification unit 1 and the coal slime dewatering and drying unit 2. The operating parameters include the material processing speeds, that is, flow rates, of the coal water purification unit 1 and the coal slime dewatering and drying unit 2. The specific selection is made by those skilled in the art based on the equipment in the coal water purification unit 1 and the coal slime dewatering and drying unit 2. For example, the automatic dissolving and dosing device 29 is used to add flocculant to the coal slime centrifugal concentrating device 28. The material processing speed corresponding to the coal slime centrifugal concentrating device 28 is the flocculant addition speed, and the material output speed corresponding to the continuous automatic high-pressure filter press 22 is the speed of continuous filter press of the coal-containing concentrate.

[0061] The DCS control module 3 can automatically control the coal water purification unit 1 and the coal slime dehydration and drying unit 2, realizing automated operation and meeting the "unmanned" control standard, reducing work intensity, saving labor costs, and improving the coal water purification effect and wastewater reuse rate.

[0062] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant, characterized in that: include: A coal water purification unit (1) comprising a regulating tank (11), an electronic flocculator (12), a coal water purification device (13), a filtration pretreatment intermediate water tank (14), a multi-media filter (15) and a clear water tank (16); A coal slime dewatering and drying unit (2) comprises a wet coal slime storage bin (21), a continuous automatic high-pressure filter press (22), a dry coal slime spiral discharger (23), a dry coal slime storage bin (24), a closed coal yard (25), an automatic mud scraper (26), a concentration water tank (27), a coal slime centrifugal concentration device (28), an automatic dissolving and dosing device (29), a separation mechanism (210) and a sedimentation tank (211); The sedimentation tank (211) transports the coal-containing wastewater to the regulating tank (11) by gravity, and the coal-containing wastewater in the regulating tank (11) passes through the electronic flocculator (12), the coal-water purification device (13), the filtration pretreatment intermediate water tank (14), the multi-media filter (15) and the clear water tank (16) in sequence; The automatic sludge scraper (26) is used to suck the sludge in the sedimentation tank (211) and transport the sludge in sequence to the concentration water tank (27), the coal sludge centrifugal concentration device (28), the wet coal sludge storage bin (21), the continuous automatic high-pressure filter press (22), the dry coal sludge spiral discharger (23), the dry coal sludge storage bin (24) and the closed coal yard (25).

2. A thermal power plant coal-containing wastewater treatment and coal slime dehydration and drying device according to claim 1, characterized in that: The coal water purification device (13) comprises an inclined tube assembly (131), a water distribution area (132), a clean water area (133), and a sludge hopper (134). The inclined tube assembly (131) is a honeycomb tube bundle made of polypropylene, PVC or glass fiber reinforced plastic, with an inclination angle of 40°-80°. The water distribution area (132) is located at the bottom of the inclined tube assembly (131), the clean water area (133) is located at the top of the inclined tube assembly (131), and the sludge hopper (134) is located at the bottom of the water distribution area.

3. The device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant according to claim 1, characterized in that: The continuous automatic high-pressure filter press (22) comprises four piston cylinders (221), the output ends of the four cylinder sleeve cylinders (221) are connected to piston rods (222), one end of the piston rods (222) away from the cylinder sleeve cylinders (221) is fixedly connected to an upper filter plate (223), a filter press chamber (227) is nested on the outer side of the upper filter plate (223), an upper filter cloth (224) is connected to the upper filter cloth (224), a lower filter cloth conveyor belt (225) is provided at the bottom of the upper filter cloth (224), and a lower filter plate (226) is provided at the bottom of the lower filter cloth conveyor belt (225).

4. The device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant according to claim 1, characterized in that: The automatic mud scraping and suction machine (26) includes a mud suction system (261), a hanger (262), and a mud scraper (263). When the sedimentation tank (211) has four grids, the hanger (262) needs to be placed horizontally on two grid sedimentation tanks (211). The mud suction system (261) includes multiple groups of mud suction pumps, and each grid sedimentation tank (211) corresponding to the mud suction system is provided with multiple groups of mud suction pumps.

5. The device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant according to claim 1, characterized in that: The coal slime centrifugal concentrating device (28) comprises a drum (281), one end of the drum (281) is coaxially connected to a reducer (283), the inner side of the reducer (283) is connected to a screw conveyor (282), the top of the drum (281) is connected to a motor (284) via a coupling, a fixed end plate (286) is provided on the top of the drum (281), a feed pipe (287) is connected to the fixed end plate (286), one end of the feed pipe (287) is connected to the output end of the coal slime lifting pump, and the feed pipe (287) then conveys the coal slime into the drum (281), a liquid discharge port (288) is provided on the fixed end plate (286), and a solid phase outlet is provided at the small end of the drum (281).

6. A thermal power plant coal-containing wastewater treatment and coal slime dehydration and drying device according to claim 4, characterized in that: The automatic dissolving and adding device (29) is used to add flocculants into the coal slime centrifugal concentration device (28).

7. The device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant according to claim 1, characterized in that: The liquid material in the continuous automatic high-pressure filter press (22) is transported to the sedimentation tank (211) by gravity.

8. The device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant according to claim 1, characterized in that: The liquid material in the coal slime centrifugal concentration device (28) is transported to the sedimentation tank (211) by gravity.

9. The device for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant according to claim 2, characterized in that: The sludge hopper (134) is connected to the concentration water tank (27) through a pipeline.

10. A system for treating coal-containing wastewater and dehydrating and filtering coal slime in a thermal power plant, characterized in that: include: A coal water purification unit (1) comprising a regulating tank (11), an electronic flocculator (12), a coal water purification device (13), a filtration pretreatment intermediate water tank (14), a multi-media filter (15) and a clear water tank (16); A coal slime dewatering and drying unit (2) comprises a wet coal slime storage bin (21), a continuous automatic high-pressure filter press (22), a dry coal slime spiral discharger (23), a dry coal slime storage bin (24), a closed coal yard (25), an automatic mud scraper (26), a concentration water tank (27), a coal slime centrifugal concentration device (28), an automatic dissolving and dosing device (29), a separation mechanism (210) and a sedimentation tank (211); A DCS control module (3) is used for real-time monitoring and control of the coal water purification unit (1) and the coal slime dehydration and drying unit (2).

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