Boiler emission multi-layer three-dimensional spraying dust removal system

Abstract

The invention discloses a boiler emission multi-layer three-dimensional spraying dust removal system, which belongs to the field of boiler dust removal, and comprises a filter chamber assembly, a filter box group and a settling box group, the filtering chamber assembly is composed of a chimney, an upper filtering chamber, a lower filtering chamber and a smoke collecting chamber from top to bottom, smoke is introduced from the lower portion of the filtering chamber assembly, passes through the lower filtering chamber and the upper filtering chamber and then is discharged from the chimney, and four sets of spray heads are arranged in the lower filtering chamber and the upper filtering chamber in total and are configured to condense and fall floating objects in the smoke. Through the arrangement of multiple layers of nozzles in the lower filtering chamber and the upper filtering chamber, a three-dimensional spraying effect is formed, and smoke dust can make full contact with water mist; and most of floating objects in the smoke dust are condensed into large particles to fall down, so that the dust removal efficiency is effectively improved, the smoke discharged from the chimney can reach strict emission standards, and the pollution to the atmospheric environment is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of boiler dust removal, in particular to a boiler discharge multi-layer stereoscopic spray dust removal system. Background Art

[0002] In the field of industrial production, boilers are common thermal energy equipment, and the smoke they emit contains a large amount of particulate matter and other pollutants. Traditional boiler dust removal technologies mainly include bag dust removal, water film dust removal and electrostatic dust removal. Although bag dust removal is widely used, there are many problems in actual use. On the one hand, a high-power blower is required to pressurize the smoke emitted by the boiler to filter it through the bag filter, which not only leads to high energy consumption of the blower, but also produces greater noise pollution, causing adverse effects on the surrounding environment. On the other hand, the filtering effect of the bag will gradually decay when it is first used, and it needs to be frequently cleaned and replaced manually, which increases labor costs and equipment maintenance costs, and also affects the continuity of production; water film dust removal and electrostatic dust removal also have some shortcomings. Water film dust removal may cause problems such as wastewater treatment during operation, increasing the cost of environmental protection treatment; although electrostatic dust removal has a good dust removal effect, it is expensive, so many boiler users choose to install it less due to cost considerations.

[0003] Therefore, in order to reduce the dust removal cost of the boiler and improve the efficiency of the boiler dust removal, a boiler emission multi-layer stereoscopic spray dust removal system is proposed. Summary of the invention

[0004] The object of the present invention is to provide a boiler discharge multi-layer stereoscopic spray dust removal system to solve the problem of high cost or inconvenience in use of traditional boiler dust removal systems mentioned in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a boiler discharge multi-layer stereoscopic spray dust removal system, comprising a filter chamber assembly, a filter box assembly and a sedimentation box assembly;

[0006] The filter chamber assembly consists of a chimney, an upper filter chamber, a lower filter chamber and a smoke collection chamber from top to bottom. Smoke enters from the bottom of the filter chamber assembly and passes through the lower filter chamber and the upper filter chamber before being discharged from the chimney. A total of four groups of nozzles are arranged in the lower filter chamber and the upper filter chamber, configured to condense and drop floating objects in the smoke.

[0007] The filter box group includes a primary filter box, a secondary filter box and a tertiary filter box. The three groups of filter boxes are respectively provided with filter screens of different finenesses, configured to perform multi-stage filtration of sewage;

[0008] The sedimentation tank group includes a primary sedimentation tank, a secondary sedimentation tank and a tertiary sedimentation tank. The three groups of sedimentation tanks perform multi-stage sedimentation on the sewage.

[0009] A pressure regulating water pump is provided on one side of the three-stage sedimentation tank to pump the settled water into the four sets of nozzles of the filter chamber assembly;

[0010] As a further preferred embodiment of the technical solution: a smoke inlet is fixedly installed in the lower filter chamber, the smoke inlet is a hollow pipe structure and the bottom of the smoke inlet is connected with the smoke collecting chamber;

[0011] A sewage umbrella is fixedly installed on the smoke inlet through a support frame. The sewage umbrella is a conical umbrella structure, and the tip of the sewage umbrella points away from the smoke inlet.

[0012] A first nozzle is fixedly installed in the lower filter chamber, and the first nozzle is arranged above the sewage umbrella;

[0013] As a further preferred embodiment of the technical solution: a fourth nozzle, a third nozzle and a second nozzle are fixedly installed in the upper filter chamber, and the three groups of nozzles are evenly arranged and distributed from top to bottom in the upper filter chamber;

[0014] As a further preferred embodiment of the technical solution: a coarse mesh is installed in the primary filter box, a fine mesh is installed in the secondary filter box, and a fine mesh is installed in the tertiary filter box, and the primary filter box and the secondary filter box, and the secondary filter box and the tertiary filter box are all connected through pipelines;

[0015] As a further preferred embodiment of the technical solution: a sewage pipe is provided between the bottom of the lower filter chamber and the primary filter box;

[0016] As a further preferred embodiment of the technical solution: a first water inlet is provided between the first-stage sedimentation tank and the second-stage sedimentation tank, a second water inlet is provided between the second-stage sedimentation tank and the third-stage sedimentation tank, a first sewage valve is provided at the bottom of the first-stage sedimentation tank, a second sewage valve is provided at the bottom of the second-stage sedimentation tank, and a third sewage valve is provided at the bottom of the third-stage sedimentation tank;

[0017] As a further preferred embodiment of the technical solution: a water pipe is provided on the top of the three-stage sedimentation tank for adding water, and an automatic water supply valve is provided on the water pipe;

[0018] As a further preferred embodiment of the technical solution: the input end of the pressure regulating water pump is connected to the middle of the three-stage sedimentation tank, and the output end of the pressure regulating water pump is provided with a water supply pipe, which is used to supply water to the fourth nozzle, the third nozzle, the second nozzle and the first nozzle;

[0019] As a further preferred embodiment of the technical solution: the diameter of the large end surface of the sewage umbrella is larger than the diameter of the smoke inlet, and a maintenance door is provided on the lower filter chamber;

[0020] As a further preferred embodiment of the present technical solution: the process is:

[0021] S1: Smoke enters the system from the smoke collecting chamber, and then enters the lower filter chamber through the smoke inlet. Smoke moves upward through the upper filter chamber and is discharged from the chimney.

[0022] S2: The first nozzle sprays water mist in the lower filter chamber to preliminarily condense the floating matter in the smoke, and the fourth nozzle, the third nozzle and the second nozzle spray water mist in the upper filter chamber to further condense the floating matter in the smoke to meet the emission standards;

[0023] S3: The sewage after the floating objects are condensed falls down, and in the process of falling, it falls on the sewage umbrella, and falls on the bottom of the lower filter chamber along the inclined surface of the outer circumference of the sewage umbrella;

[0024] S4: Sewage enters the primary filter box through the sewage pipe, first filtered by the coarse mesh and then flows to the secondary filter box at a low liquid level, then filtered by the fine mesh and then flows to the tertiary filter box at a low liquid level, then filtered by the fine mesh and then flows to the sedimentation tank group;

[0025] S5: The sewage first flows into the primary sedimentation tank, and after the primary sedimentation, it flows to the secondary sedimentation tank through the No. 1 water inlet. After the water in the secondary sedimentation tank is precipitated, it flows to the tertiary sedimentation tank through the No. 2 water inlet.

[0026] S6: After the water reaches the third-stage sedimentation tank, it is precipitated and sent to the boiler again by the high-pressure water pump to complete the recycling;

[0027] S7; The automatic water supply valve monitors the water level in the tertiary sedimentation tank and supplies water to the tertiary sedimentation tank when the water level in the tertiary sedimentation tank is low.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention forms a three-dimensional spray effect by setting the multi-layer nozzles of the lower filter chamber and the upper filter chamber, which allows the smoke to fully contact with the water mist; most of the floating objects in the smoke are condensed into larger particles and fall down, which effectively improves the dust removal efficiency, ensures that the smoke discharged from the chimney can meet the strict emission standards, and greatly reduces the pollution to the atmospheric environment;

[0030] 2. The overall design and structure of the system is relatively simple. Compared with traditional complex equipment such as electrostatic dust removal, it does not require expensive components such as electrostatic generating devices, which reduces the manufacturing cost of the equipment. At the same time, due to the simple structure, the equipment failure points are reduced, the maintenance cost is reduced, and during the operation, there is no need to add additional high-power blowers and other equipment, which avoids high equipment purchase costs and operating energy consumption costs, saving a lot of capital investment for the enterprise;

[0031] 3. The system uses the upward buoyancy of high-temperature smoke and the suction of the chimney to make the smoke flow naturally through each filtering link for filtration. No complicated external power equipment is required to force the smoke to flow. The operation process is simple and easy to understand, and it is not easy to fail. It ensures the continuous and stable operation of boiler dust removal, reduces the risk of production interruption caused by equipment failure, and improves production efficiency.

[0032] 4. Equipped with a complete filter box group and sedimentation box group, the sewage after condensation of smoke dust is subjected to multi-stage filtration and sedimentation treatment, and there is no need to manually clean and replace the filter components as frequently as bag dust removal. It is only necessary to regularly clean the filter material in the filter box and the sediment in the sedimentation box. The maintenance work is relatively simple, which reduces the manual maintenance cost and labor intensity, reduces the impact of maintenance work on production, and improves the overall use efficiency of the equipment;

[0033] 5. Since there is no need for a high-power blower, the high energy consumption problem caused by the operation of the blower is avoided, and energy saving is achieved. At the same time, the noise pollution caused by the blower is eliminated, the working environment and the surrounding environment quality are improved, which is conducive to energy conservation, environmental protection and green development. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a boiler discharge multi-layer stereoscopic spray dust removal system according to the present invention.

[0035] In the figure: 1. chimney; 2. upper filter chamber; 3. fourth nozzle; 4. third nozzle; 5. second nozzle; 6. first nozzle; 7. maintenance door; 8. sewage umbrella; 9. smoke inlet; 10. support frame; 11. smoke collection chamber; 12. lower filter chamber; 13. water supply pipe; 14. primary filter box; 15. coarse net; 16. sewage pipe; 17. secondary filter box; 18. fine net; 19. tertiary filter box; 20. fine net; 21. primary sedimentation box; 22. No. 1 sewage valve; 23. secondary sedimentation box; 24. No. 2 sewage valve; 25. tertiary sedimentation box; 26. No. 3 sewage valve; 27. No. 1 water inlet; 28. No. 2 water inlet; 29. ​​tap water valve; 30. automatic water supply valve; 31. pressure regulating water pump. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0037] Example

[0038] See also Figure 1As shown, the present invention provides a technical solution: a boiler discharge multi-layer stereoscopic spray dust removal system, including a filter chamber assembly, a filter box group and a sedimentation box group;

[0039] The filter chamber assembly is composed of a chimney 1, an upper filter chamber 2, a lower filter chamber 12 and a smoke collecting chamber 11 from top to bottom. Smoke enters from the lower part of the filter chamber assembly and passes through the lower filter chamber 12 and the upper filter chamber 2 before being discharged from the chimney 1. A total of four groups of nozzles are arranged in the lower filter chamber 12 and the upper filter chamber 2, which are configured to condense and drop floating objects in the smoke.

[0040] The filter box group includes a primary filter box 14, a secondary filter box 17 and a tertiary filter box 19. The three groups of filter boxes are respectively provided with filter screens of different finenesses, configured to perform multi-stage filtration of sewage;

[0041] The settling tank group includes a primary settling tank 21, a secondary settling tank 23 and a tertiary settling tank 25, and the three sets of settling tanks perform multi-stage settling on the sewage;

[0042] A pressure regulating water pump 31 is provided on one side of the third-stage sedimentation tank 25 for pumping the settled water into the four groups of nozzles of the filter chamber assembly.

[0043] In this embodiment, specifically: a smoke inlet 9 is fixedly installed in the lower filter chamber 12, and the smoke inlet 9 is a hollow pipe structure and the bottom is connected with the smoke collecting chamber 11;

[0044] A sewage umbrella 8 is fixedly mounted on the smoke inlet 9 through a support frame 10. The sewage umbrella 8 is a conical umbrella structure, and the tip of the sewage umbrella 8 points away from the smoke inlet 9.

[0045] A first nozzle 6 is fixedly installed in the lower filter chamber 12 , and the first nozzle 6 is arranged above the sewage umbrella 8 .

[0046] In this embodiment, specifically: the fourth nozzle 3 , the third nozzle 4 and the second nozzle 5 are fixedly installed in the upper filter chamber 2 , and the three groups of nozzles are evenly arranged and distributed from top to bottom in the upper filter chamber 2 .

[0047] In this embodiment, specifically: a coarse mesh 15 is installed in the primary filter box 14, a fine mesh 18 is installed in the secondary filter box 17, and a fine mesh 20 is installed in the tertiary filter box 19, and the primary filter box 14 and the secondary filter box 17, and the secondary filter box 17 and the tertiary filter box 19 are all connected by pipelines.

[0048] In this embodiment, specifically: a sewage pipe 16 is provided between the bottom of the lower filter chamber 12 and the primary filter box 14 .

[0049] In this embodiment, specifically: a No. 1 water inlet 27 is opened between the first-stage sedimentation tank 21 and the second-stage sedimentation tank 23, a No. 2 water inlet 28 is opened between the second-stage sedimentation tank 23 and the third-stage sedimentation tank 25, a No. 1 sewage valve 22 is provided at the bottom of the first-stage sedimentation tank 21, a No. 2 sewage valve 24 is provided at the bottom of the second-stage sedimentation tank 23, and a No. 3 sewage valve 26 is provided at the bottom of the third-stage sedimentation tank 25.

[0050] In this embodiment, specifically: a water pipe is provided on the top of the three-stage sedimentation tank 25 for adding water, a tap water valve 29 is provided on the water pipe, serving as a main valve of the tap water pipe, and an automatic water supply valve 30 is provided on the water pipe.

[0051] In this embodiment, specifically: the input end of the pressure regulating water pump 31 is connected to the middle part of the three-stage sedimentation tank 25, and the output end of the pressure regulating water pump 31 is provided with a water supply pipe 13, which is used to supply water to the fourth nozzle 3, the third nozzle 4, the second nozzle 5 and the first nozzle 6.

[0052] In this embodiment, specifically: the diameter of the large end surface of the sewage umbrella 8 is larger than the diameter of the smoke inlet 9 , and a maintenance door 7 is provided on the lower filter chamber 12 .

[0053] In this embodiment, the specific process is:

[0054] S1: Smoke enters the system from the smoke collecting chamber 11, and then enters the lower filter chamber 12 through the smoke inlet 9. The smoke moves upward through the upper filter chamber 2 and is discharged from the chimney 1.

[0055] S2: The first nozzle 6 sprays water mist in the lower filter chamber 12 to preliminarily condense the floating matter in the smoke, and the fourth nozzle 3, the third nozzle 4 and the second nozzle 5 spray water mist in the upper filter chamber 2 to further condense the floating matter in the smoke to meet the emission standards;

[0056] S3: The sewage after the floating objects are condensed falls down, and in the process of falling, it falls on the sewage umbrella 8, and falls on the bottom of the lower filter chamber 12 along the inclined surface of the outer circumference of the sewage umbrella 8;

[0057] S4: The sewage enters the primary filter box 14 through the sewage pipe 16, and first passes through the coarse mesh 15 to flow to the secondary filter box 17 at a low liquid level, and then passes through the fine mesh 18 to flow to the tertiary filter box 19 at a low liquid level, and then passes through the fine mesh 20 to flow to the sedimentation tank group;

[0058] S5: The sewage first flows into the primary sedimentation tank 21, and after the primary sedimentation, flows to the secondary sedimentation tank 23 through the first water inlet 27. After the water in the secondary sedimentation tank 23 is precipitated, it flows to the tertiary sedimentation tank 25 through the second water inlet 28;

[0059] S6: After the water reaches the third-stage sedimentation tank 25 and settles, it is pumped to the boiler again by the high-pressure water pump to complete the recycling;

[0060] S7; the automatic water supply valve 30 monitors the water level in the tertiary sedimentation tank 25, and supplies water to the tertiary sedimentation tank 25 when the water level in the tertiary sedimentation tank 25 is low.

[0061] Working principle or structural principle: When smoke enters the system from the smoke collecting chamber 11, the water mist sprayed by the first nozzle 6 first contacts the rising smoke in the lower filter chamber 12. Since the tiny particles of the water mist have a strong adhesion to the floating objects in the smoke, the larger particles of impurities in the smoke will quickly combine with the water mist, and begin to condense and fall under the action of gravity. Subsequently, the smoke containing the floating objects that have not been completely condensed continues to rise and enters the upper filter chamber 2; here, the fourth nozzle 3, the third nozzle 4 and the second nozzle 5 spray the smoke from top to bottom in turn, and the arrangement of the nozzles in the upper filter chamber 2 enables the smoke to fully contact with the water mist during the rising process, further improving the condensation efficiency of the floating objects; after multi-layer spraying treatment, most of the floating objects in the smoke are condensed into larger particles and fall, so that the smoke discharged from the chimney 1 meets the emission standards;

[0062] The falling sewage enters the primary filter box 14 through the sewage pipe 16. In the primary filter box 14, the coarse mesh 15 can intercept larger solid impurities in the sewage, such as larger particles of dust, coal slag, etc. The sewage filtered by the coarse mesh 15 flows to the secondary filter box 17 under the action of the liquid level difference; in the secondary filter box 17, the fine mesh 18 further filters out smaller impurity particles, so that the sewage is further purified, and then the sewage continues to flow to the tertiary filter box 19, and the fine mesh 20 finely filters the sewage to remove tiny suspended particles and other impurities;

[0063] The sewage filtered by the tertiary filter box 19 enters the sedimentation tank group; first enters the primary sedimentation tank 21, in which the sewage flow rate slows down, and some impurities with larger specific gravity settle to the bottom of the tank under the action of gravity; after a period of sedimentation, the relatively clear water in the upper layer flows into the secondary sedimentation tank 23 through the first water inlet 27; in the secondary sedimentation tank 23, the same sedimentation process occurs again to further remove the impurities remaining in the water; after the water in the secondary sedimentation tank 23 is precipitated, it flows into the tertiary sedimentation tank 25 through the second water inlet 28; after the water in the tertiary sedimentation tank 25 is precipitated, it has reached a certain degree of cleanliness; at this time, the pressure regulating water pump 31 pumps out the water in the tertiary sedimentation tank 25 and transports it to the nozzles of the upper filter chamber 2 and the lower filter chamber 12 through the water supply pipe 13 to realize the recycling of water; the automatic water supply valve 30 monitors the water level in the tertiary sedimentation tank 25 in real time, and when the water level is low, it automatically replenishes water into the tertiary sedimentation tank 25 to ensure the normal operation of the water cycle of the entire system.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler discharge multi-layer three-dimensional spray dust removal system, characterized in that: It includes a filter chamber assembly, a filter box assembly and a sedimentation box assembly; The filter chamber assembly is composed of a chimney (1), an upper filter chamber (2), a lower filter chamber (12) and a smoke collection chamber (11) from top to bottom. Smoke enters from the bottom of the filter chamber assembly and passes through the lower filter chamber (12) and the upper filter chamber (2) before being discharged from the chimney (1). A total of four groups of nozzles are arranged in the lower filter chamber (12) and the upper filter chamber (2) and are configured to condense and drop floating matter in the smoke. The filter box group includes a primary filter box (14), a secondary filter box (17) and a tertiary filter box (19), wherein filter screens of different fineness are respectively arranged in the three groups of filter boxes, and are configured to perform multi-stage filtration on sewage; The sedimentation tank group includes a primary sedimentation tank (21), a secondary sedimentation tank (23) and a tertiary sedimentation tank (25), and the three groups of sedimentation tanks perform multi-stage sedimentation on the sewage; A pressure regulating water pump (31) is provided on one side of the three-stage sedimentation tank (25) for pumping the precipitated water into the four groups of nozzles of the filter chamber assembly.

2. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 1, characterized in that: A smoke inlet (9) is fixedly installed in the lower filter chamber (12); the smoke inlet (9) is a hollow pipe structure and the bottom thereof is connected to the smoke collecting chamber (11); A sewage umbrella (8) is fixedly mounted on the smoke inlet (9) via a support frame (10); the sewage umbrella (8) is a conical umbrella structure, and the tip of the sewage umbrella (8) points in a direction away from the smoke inlet (9); A first nozzle (6) is fixedly installed in the lower filter chamber (12), and the first nozzle (6) is arranged above the sewage umbrella (8).

3. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 2, characterized in that: A fourth nozzle (3), a third nozzle (4) and a second nozzle (5) are fixedly installed in the upper filter chamber (2), and the three groups of nozzles are evenly arranged and distributed from top to bottom in the upper filter chamber (2).

4. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 3, characterized in that: A coarse mesh (15) is installed in the primary filter box (14), a fine mesh (18) is installed in the secondary filter box (17), and a fine mesh (20) is installed in the tertiary filter box (19). The primary filter box (14) and the secondary filter box (17), as well as the secondary filter box (17) and the tertiary filter box (19) are connected via pipelines.

5. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 4, characterized in that: A sewage pipe (16) is provided between the bottom of the lower filter chamber (12) and the primary filter box (14).

6. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 5, characterized in that: A first water inlet (27) is provided between the first-stage sedimentation tank (21) and the second-stage sedimentation tank (23), a second water inlet (28) is provided between the second-stage sedimentation tank (23) and the third-stage sedimentation tank (25), a first sewage valve (22) is provided at the bottom of the first-stage sedimentation tank (21), a second sewage valve (24) is provided at the bottom of the second-stage sedimentation tank (23), and a third sewage valve (26) is provided at the bottom of the third-stage sedimentation tank (25).

7. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 6, characterized in that: The top of the three-stage sedimentation tank (25) is provided with a water pipe for adding water, and the water pipe is provided with an automatic water supply valve (30).

8. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 7, characterized in that: The input end of the pressure regulating water pump (31) is connected to the middle of the third-stage sedimentation tank (25), and the output end of the pressure regulating water pump (31) is provided with a water supply pipe (13), which is used to supply water to the fourth nozzle (3), the third nozzle (4), the second nozzle (5) and the first nozzle (6).

9. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 8, characterized in that: The diameter of the large end surface of the sewage umbrella (8) is larger than the diameter of the smoke inlet (9), and a maintenance door (7) is provided on the lower filter chamber (12).

10. A boiler discharge multi-layer stereoscopic spray dust removal system according to claim 9, characterized in that: The process is: S1: smoke enters the system from the smoke collecting chamber (11), the smoke passes through the smoke inlet (9) and enters the lower filter chamber (12), the smoke moves upward and passes through the upper filter chamber (2) and is discharged from the chimney (1); S2: the first nozzle (6) sprays water mist in the lower filter chamber (12) to initially condense floating matter in the smoke, and the fourth nozzle (3), the third nozzle (4) and the second nozzle (5) spray water mist in the upper filter chamber (2) to further condense floating matter in the smoke to meet the emission standards; S3: The sewage after the floating objects are condensed falls down, and in the process of falling, it falls on the sewage umbrella (8), and falls on the bottom of the lower filter chamber (12) along the inclined surface of the outer circumference of the sewage umbrella (8); S4: The sewage enters the primary filter box (14) through the sewage pipe (16), is first filtered by the coarse mesh (15), and then flows to the secondary filter box (17) at a low liquid level, then is filtered by the fine mesh (18), and then flows to the tertiary filter box (19) at a low liquid level, and then is filtered by the fine mesh (20), and then flows to the sedimentation tank group; S5: The sewage first flows into the primary sedimentation tank (21), and after the primary sedimentation, flows through the first water inlet (27) to the secondary sedimentation tank (23). After the water in the secondary sedimentation tank (23) is precipitated, it flows through the second water inlet (28) to the tertiary sedimentation tank (25); S6: The water reaching the third-stage sedimentation tank (25) is precipitated and then pumped to the boiler again by the high-pressure water pump to complete the recycling; S7; the automatic water supply valve (30) monitors the water level in the tertiary sedimentation tank (25), and supplies water to the tertiary sedimentation tank (25) when the water level in the tertiary sedimentation tank (25) is low.

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