Flue gas waste heat multi-stage recovery heat pump system based on heat pipe heat exchange

Abstract

The flue gas waste heat multi-stage recovery heat pump system based on heat pipe heat exchange comprises a flue gas recovery box, a pre-cooling evaporator is fixed to the left side of the interior of the flue gas recovery box, and an atomization spraying head is fixed to the side, close to the pre-cooling evaporator, of the top end of the flue gas recovery box; a partition plate is fixed to the position, close to the pre-cooling evaporator, in the flue gas recycling box, a heat pipe heat exchanger is arranged on the right side of the partition plate, a splitter plate is arranged on the right side of the heat pipe heat exchanger, and a flue gas low-temperature treatment assembly is arranged on the right side of the splitter plate. The system adopts a heat pipe heat exchange technology and a multi-stage recovery design, the flue gas temperature is subjected to multi-stage treatment, the waste heat recovery effect is improved, the energy utilization rate is remarkably increased, atomized water sprayed by an atomization spray header 3 in a pre-cooling area is combined with a plate-fin structure of a pre-cooling evaporator 2, flue gas cooling and dust falling work is synchronously achieved, and the energy consumption is reduced. Dust-containing wastewater is separated, water resources are recycled, the wastewater utilization efficiency is improved, and sewage discharge is reduced.

Description

Technical Field

[0001] The present invention relates to the field of flue gas waste heat recovery, and more specifically to a multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange. Background Art

[0002] During industrial production processes, numerous industries such as iron and steel, chemical engineering, etc. generate a large amount of high-temperature flue gas. This high-temperature flue gas contains considerable waste heat resources. If it can be effectively recovered and utilized, it will be of great significance for reducing energy consumption and improving energy utilization efficiency. However, there are many deficiencies in the current technologies for the recovery and utilization of industrial flue gas waste heat. Most existing flue gas waste heat recovery systems adopt a single recovery method and cannot achieve multi-stage recovery, resulting in a low waste heat recovery efficiency and making it difficult to fully exploit the waste heat value in the flue gas. Many systems can only reduce the flue gas temperature to a limited extent and cannot fully convert the waste heat in the high-temperature flue gas into an available energy form, causing a large amount of energy waste. Some recovery systems have limited capabilities in flue gas purification and cannot effectively remove dust and harmful substances in the flue gas, which not only pollutes the environment but may also affect the normal operation and service life of subsequent equipment.

[0003] Moreover, when existing systems handle flue gas, they often generate a large amount of dust-containing wastewater and lack an effective wastewater treatment and recycling mechanism, resulting in waste of water resources and environmental pollution. In terms of the structural design of the system, many traditional systems lack the concept of modular design, making the installation, maintenance, and replacement of equipment difficult, with high maintenance costs, and it is difficult to flexibly adjust and optimize according to different operating conditions.

[0004] Therefore, there is an urgent practical need to develop a highly efficient, stable, environmentally friendly, and well-adaptable multi-stage recovery system for flue gas waste heat to achieve the efficient recovery and utilization of industrial flue gas waste heat and clean emissions, improve energy utilization efficiency, and reduce the impact on the environment. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange, including a flue gas recovery tank. On the left side inside the flue gas recovery tank, a pre-cooling evaporator is fixed. On one side of the top of the flue gas recovery tank near the pre-cooling evaporator, an atomizing spray head is fixed. Inside the flue gas recovery tank near the pre-cooling evaporator, a partition is fixed. On the right side of the partition, a heat pipe heat exchanger is arranged. On the right side of the heat pipe heat exchanger, a flow dividing plate is arranged. On the right side of the flow dividing plate, a flue gas low-temperature treatment component is arranged. At the bottom of the flue gas recovery tank, a heat pump component is arranged. On the left side of the bottom end of the flue gas recovery tank, a waste water pipe is inserted. The other end of the waste water pipe is inserted into a waste water tank. On one side of the waste water tank away from the waste water pipe, a waste water tank cover is arranged in an openable manner. Inside the waste water tank, a dust filtering plate is fixed. At the bottom end inside the waste water tank, a sealing component is arranged. At the bottom end of the waste water tank, a sludge collection component is arranged. The right side of the waste water tank is connected to the heat pump component through a three-way pipe. On the front surface of the waste water tank, an observation window is fixed. At the back of the waste water tank, a water pump is inserted.

[0007] Further, a plurality of through holes are formed in the flow dividing plate, and both sides of each through hole are tapered holes.

[0008] Further, the flue gas low-temperature treatment component includes a support frame which is inserted into the right side inside the flue gas recovery tank. Inside the support frame, a plurality of storage boxes are fixed. Inside both sides of each storage box, filter plates are fixed. The inside of each storage box is hollow to form a cavity, and a filler is arranged inside the cavity.

[0009] Further, the heat pump component includes a compressor which is arranged at the center of the bottom end of the flue gas recovery tank. On the right side of the compressor, a heat exchanger is arranged. On the right side of the heat exchanger, a condenser is arranged. Both the condenser and the heat exchanger are fixedly connected to the flue gas recovery tank. The compressor is connected to the flue gas recovery tank through a shock absorption component.

[0010] Further, the shock absorption component includes a support plate which is fixed at the bottom end of the flue gas recovery tank. At the four corners of the bottom end of the support plate, buffer members are fixed. At the bottom end of each buffer member, a fixing plate is fixed. Inside the four corners of the fixing plate, limiting rods are inserted. The limiting rods penetrate through the buffer members and are fixedly connected to the support plate. At one end of the limiting rod exposed outside the fixing plate, threads are provided, and a nut is threadedly connected to the outer wall of the threads.

[0011] Further, a plurality of tapered through holes are formed inside the dust filtering plate.

[0012] Further, the sealing component includes two shaft rods which are rotatably connected to the bottom end inside the waste water tank. On the outer wall of each shaft rod, a sealing baffle is fixed. On the inner end face of the sealing baffle, a rubber strip is fixed.

[0013] Furthermore, the sludge collection component includes a connecting plate fixed to the two side wall surfaces of the wastewater tank. An insertion plate is inserted into the outer wall of the connecting plate, and a sludge tank is fixed to the bottom end of the insertion plate.

[0014] The beneficial effects of the present invention are as follows: High-efficiency waste heat recovery ability: The system adopts heat pipe heat exchange technology and multi-stage recovery design to perform multi-stage treatment on the flue gas temperature, increasing the waste heat recovery effect and significantly improving the energy utilization rate.

[0015] Deep flue gas purification and water-saving environmental protection: The atomized water sprayed by the atomizing spray heads in the precooling area, combined with the plate fin structure of the precooling evaporator, simultaneously achieves the work of reducing the flue gas temperature and dust. The wastewater tank is internally provided with a dust filtering plate and a sludge collection component to separate the dust-containing wastewater and recycle water resources, increasing the wastewater utilization efficiency and reducing sewage discharge.

[0016] Modular design and convenient maintenance: The low-temperature treatment component adopts a detachable support frame and a modular storage box, which can perform waste heat recovery and purification and discharge work on the low-temperature flue gas. The closing component at the bottom of the wastewater tank realizes sludge discharge, and the sludge tank is convenient for centralized cleaning, reducing the maintenance cost.

[0017] Operation stability: The conical through-hole design of the flow splitting plate makes the flue gas flow velocity uniform and stable, enhancing the degree of turbulence and improving the heat exchange efficiency. The compressor reduces the vibration amplitude through the shock absorption component, increasing the service life of the equipment.

[0018] In summary, through multi-stage waste heat recovery, modular design, and environmental protection treatment, the present invention realizes the efficient utilization and clean discharge of industrial flue gas waste heat, is applicable to industries such as steel and chemical industries, and has significant economic and environmental benefits. Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of the present invention.

[0020] Figure 2 is Figure 1 the front view cross-sectional connection structure detail diagram of

[0021] Figure 3 is Figure 2 the right view cross-sectional connection structure detail diagram of the flue gas recovery box and the precooling evaporator in

[0022] Figure 4 is Figure 2 the right view cross-sectional connection structure detail diagram of the flue gas low-temperature treatment component in

[0023] Figure 5 is Figure 1 the right view cross-sectional connection structure detail diagram of the wastewater tank in

[0024] Figure 6 is Figure 2 The right - view sectional connection structure detail drawing of the heat pipe heat exchanger in the middle.

[0025] Figure 7 is Figure 2 The right - view connection structure detail drawing of the flow - dividing plate in the middle.

[0026] Figure 8 is Figure 5 The enlarged connection structure detail drawing of the position at A in the middle.

[0027] Figure 9 is Figure 2 The enlarged connection structure detail drawing of the position at B in the middle.

[0028] Explanation of reference numerals: 1. Flue - gas recovery box, 2. Pre - cooling evaporator, 3. Atomizing spray head, 4. Partition board, 5. Heat pipe heat exchanger, 6. Flow - dividing plate, 7. Support plate, 8. Buffer member, 9. Fixed plate, 10. Limiting rod, 11. Compressor, 12. Heat exchanger, 13. Condenser, 14. Waste - water pipe, 15. Waste - water tank, 16. Waste - water tank cover, 17. Dust - filtering plate, 18. Shaft rod, 19. Sealing baffle, 20. Connection plate, 21. Insertion plate, 22. Sludge box, 23. Three - way pipe, 24. Water pump, 25. Support frame, 26. Storage box, 27. Filter plate, 28. Filler, 29. Observation window. Detailed implementation manners

[0029] The following further elaborates the present invention in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the application.

[0030] See Figures 1-9 It is a schematic structural drawing of the present invention. A multi - stage recovery heat pump system for flue - gas waste heat based on heat pipe heat exchange includes a flue - gas recovery box 1. It adopts a horizontal box body, and its interior is carefully divided into three functional modules: a pre - cooling area, a medium - temperature recovery area, and a low - temperature treatment area.

[0031] The high-temperature flue gas generated by industrial production is connected to the left side of the flue gas recovery box 1 from the flue and directly enters the precooling zone. The precooling evaporator 2 is firmly fixed on the left side inside the flue gas recovery box 1. This evaporator is of a stainless steel plate fin structure. The cooling water inlet of the precooling evaporator 2 is connected to an external cold water circulation pump through a steel pipe, and the cooling water outlet is connected to the wastewater tank 15 using a steel pipe. An electromagnetic flowmeter is also installed in the connecting pipeline. Its main function is to work in coordination with the atomizing spray to cool the high-temperature flue gas and at the same time condense some of the water vapor in the flue gas into dust-containing condensate water. The dust-containing condensate water generated by the precooling evaporator 2 flows into the wastewater tank 15 through the wastewater pipe 14. An electric control valve and an electromagnetic flowmeter are installed on the wastewater pipe 14 to control the flow rate and monitor the drainage volume.

[0032] On one side of the top of the flue gas recovery box 1 close to the precooling evaporator 2, an atomizing spray head 3 is fixed. The atomizing spray head 3 is connected to the soft water tank through a stainless steel pipe, and an electric control valve is set on the connecting pipeline. This control valve is linked with the inlet temperature sensor and can accurately adjust the water spray volume according to the flue gas temperature, so as to achieve rapid cooling and dust reduction of the flue gas. Inside the flue gas recovery box 1, close to the precooling evaporator 2, a partition plate 4 is installed. The partition plate 4 serves to separate the precooling zone and the medium-temperature recovery zone, ensuring the independent functions of different zones. The precooled flue gas passes through the channel reserved on the partition plate 4 and flows into the medium-temperature recovery zone where the heat pipe heat exchanger 5 is located. On the right side of the partition plate 4, there is a heat pipe heat exchanger 5. Acetone is filled in the pipe as the working medium. The heat pipe condensation section on the heat pump side is inserted into the compression heat pump evaporator, and its function is to efficiently transfer the waste heat of the flue gas to the compression heat pump system. On the right side of the heat pipe heat exchanger 5, there is a flow distribution plate 6. The flow distribution plate 6 is made of carbon steel and is provided with a plurality of through holes. Both sides of the through holes are tapered holes, which can control the passing speed of the flue gas. The function of the flow distribution plate 6 is to evenly distribute the flue gas flow direction, enhance the degree of turbulence, and thus improve the heat exchange efficiency.

[0033] On the right side of the flow distribution plate 6, there is a flue gas low-temperature treatment component. The flue gas low-temperature treatment component includes a support frame 25, which is firmly inserted into the right side inside the flue gas recovery box 1 and fixed to the side wall of the box through bolts, and a thermal expansion gap is reserved. It is mainly used to carry and store the storage box 26. The flue gas coming out of the heat pipe heat exchanger 5 enters the storage box 26 inside the support frame 25 after being evenly distributed by the flow distribution plate 6. A plurality of storage boxes 26 are fixed inside the support frame 25. Filter plates 27 are fixed on both sides inside the storage box 26. The filter plates 27 are stainless steel meshes. The inside of the storage box 26 is hollow to form a cavity, and a packing 28 is arranged inside the cavity. The packing 28 is a regular packing and is made of ceramics. The flue gas processed by the storage box 26 is discharged through the discharge port, and the deep purification and waste heat recovery of the flue gas can be realized.

[0034] A heat pump assembly is arranged at the bottom of the flue gas recovery box 1, and the heat pump assembly includes a compressor 11. The compressor 11 is arranged at the bottom center of the flue gas recovery box 1 and is a semi-closed screw type. After the refrigerant absorbs heat on the heat pump side of the pre-cooling evaporator 2 and the heat pipe heat exchanger 5, it is connected to the gas-liquid separator in a gaseous form through a copper tube. After separating the liquid that may be carried, it enters the air intake port of the compressor 11 through a copper tube of the same diameter. The exhaust pipe of the compressor 11 is connected to the condenser 13 through a steel pipe, and the exhaust pipe is coated with rubber and plastic insulation material to reduce heat loss. A heat exchanger 12 is arranged on the right side of the compressor 11. The heat exchanger 12 is a plate heat exchanger. A condenser 13 is arranged on the right side of the heat exchanger 12. The condenser 13 is a shell and tube type. The condenser 13 and the heat exchanger 12 are both fixedly connected to the flue gas recovery box 1. The condenser 13 and the heat exchanger 12 jointly raise the medium-temperature waste heat to hot water for use.

[0035] The liquid refrigerant coming out of the condenser 13 is throttled and depressurized by the throttling device, and then returns to the pre-cooling evaporator 2 and the heat pump side of the heat pipe heat exchanger 5 through the copper tube to complete a refrigeration cycle. The compressor 11 is connected to the flue gas recovery box 1 through the shock absorbing assembly. The shock absorbing assembly includes a support plate 7, which is fixed to the bottom end of the flue gas recovery box 1. The four corners of the bottom end of the support plate 7 are fixed with buffers 8. The buffers 8 are spring shock absorbers. The bottom end of the buffer 8 is fixed with a fixing plate 9. The four corners of the fixing plate 9 are internally inserted with limit rods 10. The limit rods 10 are stainless steel rods that penetrate the buffers 8 and are fixedly connected to the support plate 7. The limit rods 10 are exposed at one end of the fixing plate 9 and are provided with threads, and the outer wall of the limit rods 10 is threaded with nuts. The function of the shock absorbing assembly is to reduce the vibration transmission of the compressor, thereby extending the service life of the equipment.

[0036] A waste water pipe 14 is plugged into the left side of the bottom end of the flue gas recovery box 1, and a waste water tank 15 is plugged into the other end of the waste water pipe 14. A waste water tank cover 16 can be opened and closed on the side of the waste water tank 15 away from the waste water pipe 14, which is convenient for cleaning and maintenance of the inside of the waste water tank. A dust filter plate 17 is fixed inside the waste water tank 15. A plurality of conical through holes are opened inside the dust filter plate 17, and the inlet gradually narrows to the outlet, which can effectively separate the dust in the flue gas condensate water. A closing component is provided at the bottom end of the interior of the waste water tank 15, and the closing component includes a shaft rod 18. The number of the shaft rods 18 is two, and the shaft rods are stainless steel rods. The rotating shaft rods 18 are connected to the waste water tank 15. Connected to the inner bottom end of the wastewater tank 15, a sealing baffle 19 is fixed on the outer wall of the shaft 18, and a rubber strip is fixed on the inner end face of the sealing baffle 19, which can be opened and closed periodically to realize automatic sludge discharge from the wastewater tank. During sludge discharge, the sludge falls into the sludge box 22 by gravity. A sludge collecting assembly is provided at the bottom end of the wastewater tank 15, and the sludge collecting assembly includes a connecting plate 20, which is fixed on the two side walls of the wastewater tank 15, and a plug plate 21 is plugged into the outer wall of the connecting plate 20, and the plug plate 21 is made of stainless steel. A sludge box 22 is fixed to the bottom end of the plug plate 21, which is convenient for collecting dust-containing sludge for centralized treatment.

[0037] The right side of the wastewater tank 15 is connected to the heat pump assembly through a tee pipe 23. The wastewater filtered by the dust filter plate 17 in the wastewater tank 15, a part of it passes through a steel pipe, is connected to the heat exchanger 12 or the condenser 13 of the heat pump assembly through the tee pipe 23, and is recycled as a cooling medium. An electric control valve is provided on the pipeline connecting the wastewater tank 15 and the heat pump assembly to adjust the water volume according to the requirements of the heat pump assembly. Another part is pumped out by a water pump 24 and transported to a wastewater treatment plant through a pipeline for advanced treatment. An observation window 29 is fixed on the front surface of the wastewater tank 15 to facilitate the staff to observe the water level and water quality in the wastewater tank. The water pump 24 is plugged into the back of the wastewater tank 15, and the water pump 24 is used to pump out the wastewater for subsequent treatment.

[0038] When the present invention is in use: The high-temperature flue gas generated by industrial production enters the left side of the flue gas recovery tank 1 through a pipeline from the flue, and enters the precooling zone. In the precooling zone, the precooling evaporator 2 and the atomizing spray head 3 work together. The precooling evaporator 2 is of a steel plate fin structure, and its cooling water is transported by a steel pipe through an external cold water circulation pump. The outlet is connected to the wastewater tank 15 through a steel pipe, and an electromagnetic flowmeter is built in to monitor the water volume. The atomizing spray head 3 is connected to the softening water tank through a stainless steel pipe. The high-temperature flue gas exchanges heat and removes dust with the cooling water and atomized water in the precooling zone. The generated dust-containing condensate flows into the wastewater tank 15 through the wastewater pipe 14. The precooled flue gas passes through the channel on the partition plate 4 and enters the heat pipe heat exchanger 5 in the medium-temperature recovery zone through the partition plate 4. It transfers the waste heat of the flue gas to the heat pump assembly. After the refrigerant absorbs heat on the heat pump sides of the precooling evaporator 2 and the heat pipe heat exchanger 5, it enters the gas-liquid separator in a gaseous state through a copper pipe. After separating the liquid, it enters the compressor 11 again. The compressed high-temperature and high-pressure refrigerant gas enters the condenser 13 through a steel pipe. The flue gas coming out of the medium-temperature recovery zone is evenly distributed by the flow dividing plate 6 and enters the storage tank 26 of the flue gas low-temperature treatment assembly, and passes through the ceramic filler 28 to achieve deep purification and waste heat recovery of the flue gas.

[0039] The dust filter plate 17 inside the wastewater tank 15 has a conical through-hole to separate dust. A part of the wastewater enters the heat exchanger 12 or the condenser 13 of the heat pump assembly through a steel pipe and a tee pipe 23 for recycling. Another part is pumped out by the water pump 24 and sent to the wastewater treatment plant. The closing assembly at the bottom of the wastewater tank 15 controls the opening and closing of the sealing baffle 19 through a shaft rod 18, so that the sludge falls into the sludge tank 22. The sludge tank 22 can clean the sludge regularly. The liquid refrigerant coming out of the condenser 13 is throttled and depressurized by a throttling device and then returns to the heat pump sides of the precooling evaporator 2 and the heat pipe heat exchanger 5 through a copper pipe to complete the refrigeration cycle. Finally, the low-temperature flue gas purified and with waste heat recovered by the low-temperature treatment assembly is discharged.

Claims

1. A multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange, comprising a flue gas recovery tank (1), characterized in that, On the left side inside the flue gas recovery box (1), a pre-cooling evaporator (2) is fixed. On one side of the top of the flue gas recovery box (1) near the pre-cooling evaporator (2), an atomizing spray head (3) is fixed. Inside the flue gas recovery box (1) near the pre-cooling evaporator (2), a partition plate (4) is fixed. On the right side of the partition plate (4), a heat pipe heat exchanger (5) is arranged. On the right side of the heat pipe heat exchanger (5), a flow dividing plate (6) is arranged. On the right side of the flow dividing plate (6), a flue gas low-temperature treatment assembly is arranged. At the bottom of the flue gas recovery box (1), a heat pump assembly is arranged. On the left side of the bottom end of the flue gas recovery box (1), a waste water pipe (14) is inserted. The other end of the waste water pipe (14) is inserted into a waste water tank (15). On one side of the waste water tank (15) away from the waste water pipe (14), a waste water tank cover (16) is arranged in an openable and closable manner. Inside the waste water tank (15), a dust filtering plate (17) is fixed. At the bottom end inside the waste water tank (15), a sealing assembly is arranged. At the bottom end of the waste water tank (15), a sludge collection assembly is arranged. The right side of the waste water tank (15) is connected to the heat pump assembly through a tee pipe (23). On the front surface of the waste water tank (15), an observation window (29) is fixed. At the back of the waste water tank (15), a water pump (24) is inserted.

2. The flue gas waste heat multi-stage recovery heat pump system based on heat pipe heat exchange according to claim 1, characterized in that: The flow dividing plate (6) is provided with a plurality of through holes, and both sides of each through hole are tapered holes.

3. The multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange according to claim 1, wherein: The flue gas low-temperature treatment assembly includes a support frame (25). The support frame (25) is inserted inside the right side of the flue gas recovery box (1). Inside the support frame (25), a plurality of storage boxes (26) are fixed. Inside both sides of the storage box (26), filter plates (27) are fixed. The inside of the storage box (26) is hollow to form a cavity, and a filler (28) is arranged inside the cavity.

4. A multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange according to claim 1, characterized in that: The heat pump assembly includes a compressor (11). The compressor (11) is arranged at the center of the bottom end of the flue gas recovery box (1). On the right side of the compressor (11), a heat exchanger (12) is arranged. On the right side of the heat exchanger (12), a condenser (13) is arranged. Both the condenser (13) and the heat exchanger (12) are fixedly connected to the flue gas recovery box (1). The compressor (11) is connected to the flue gas recovery box (1) through a shock absorption assembly.

5. A multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange according to claim 4, characterized in that: The shock absorption assembly includes a support plate (7). The support plate (7) is fixed at the bottom end of the flue gas recovery box (1). At the four corners of the bottom end of the support plate (7), buffer members (8) are fixed. At the bottom end of the buffer member (8), a fixing plate (9) is fixed. Inside the four corners of the fixing plate (9), limiting rods (10) are inserted. The limiting rods (10) penetrate through the buffer members (8) and are fixedly connected to the support plate (7). One end of the limiting rod (10) exposed outside the fixing plate (9) is provided with threads, and a nut is threadedly connected to the outer wall of the threads.

6. A multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange according to claim 1, characterized in that: The inside of the dust filtering plate (17) is provided with a plurality of tapered through holes.

7. A multi-stage heat recovery heat pump system for flue gas waste heat based on heat pipe heat exchange according to claim 1, characterized in that: The enclosed component includes a shaft rod (18), and the number of the shaft rods (18) is two. The shaft rods (18) are rotatably connected to the inner bottom end of the wastewater tank (15). A sealing baffle (19) is fixed to the outer wall of the shaft rod (18), and a rubber strip is fixed to the inner end face of the sealing baffle (19).

8. A multi-stage recovery heat pump system for flue gas waste heat based on heat pipe heat exchange according to claim 1, characterized in that: The sludge collection component includes a connecting plate (20). The connecting plate (20) is fixed to the side wall surfaces of the wastewater tank (15). A plug board (21) is inserted into the outer wall of the connecting plate (20), and a sludge box (22) is fixed to the bottom end of the plug board (21).

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