Wastewater multi-treatment system for pollution control

Abstract

The invention discloses a wastewater multi-treatment system for pollution abatement, and belongs to the technical field of wastewater and waste gas treatment, the wastewater multi-treatment system for pollution abatement comprises an absorption water tank for ammonia gas absorption treatment, the absorption water tank is provided with a waste gas collecting and conveying gas channel, a heat exchange absorption cover is connected with a conversion absorption disc through a conversion device, and the conversion absorption disc is provided with a plurality of heat exchange channels. Residual hydrogen and ammonia gas which are not fully absorbed in the absorption water tank are sucked into the treatment system again through the concentration opening in the waste gas collecting and conveying gas channel by means of airflow suction force, circulation treatment is formed, and the hydrogen gathering cover on the top of the equipment naturally floats and is enriched by means of the physical characteristic that hydrogen is low in density. By arranging the valve capable of being controlled to be opened and closed, high-concentration hydrogen is guided into the combustion device and is mixed with air sucked in through the inclined oxygen inlet to be safely combusted, the explosion hidden danger caused by hydrogen accumulation in tail gas is thoroughly eliminated, purification and final treatment of hydrogen are achieved, and the safety of exhausted gas is ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater and waste gas treatment technology, and in particular to a multi-stage wastewater treatment system for pollution control. Background Technology

[0002] With the rapid development of industrial production, especially in industries such as dyes and chemicals, a large amount of complex wastewater is generated. This wastewater not only contains high concentrations of organic matter, color, and salt, but also continuously releases volatile gases, primarily ammonia (NH3) and hydrogen (H2), during storage, transportation, and preliminary treatment. Improper treatment of these gases can lead to resource waste, environmental pollution, and even safety hazards. Currently, existing technologies for treating these gases accompanying wastewater typically employ separate, independent units, which have the following main shortcomings: 1. Incomplete release and low recovery efficiency of waste gas: During the transportation and temporary storage of wastewater, the free ammonia and hydrogen dissolved in it escape slowly and incompletely. Existing systems lack active and efficient thermal driving means to promote the full transfer of waste gas from the liquid phase to the gas phase, resulting in a large amount of valuable components (such as ammonia) remaining in the wastewater. This increases the difficulty and cost of subsequent advanced wastewater treatment and also wastes ammonia resources.

[0003] 2. Inadequate Energy Efficiency and Safety of Ammonia Absorption Processes: The absorption efficiency of ammonia in water is closely related to temperature; the lower the temperature, the higher the solubility. Existing ammonia absorption devices often directly pass uncooled, high-temperature waste gas into the absorbent liquid, limiting absorption efficiency. Furthermore, insufficient sealing of the absorption system may lead to leakage of unabsorbed ammonia, causing secondary air pollution and posing safety and health risks to the working environment.

[0004] 3. When the wastewater contains volatile organic compounds (such as certain intermediates in the indigo production process), these organic compounds enter the subsequent heat exchange and treatment units along with the exhaust gas. They easily condense, adhere, and accumulate on the heat exchange surfaces, causing severe blockage of the heat exchange channels. This not only leads to a sharp decline in the system's heat exchange efficiency but also requires frequent shutdowns for manual or chemical cleaning, seriously affecting the continuous and stable operation of the entire treatment system and resulting in high maintenance costs.

[0005] 4. Low Integration of Multi-Component Waste Gas Separation and Safe Disposal: Waste gases escaping from wastewater are typically mixtures of various gases such as ammonia and hydrogen. Hydrogen, being a flammable and explosive gas, poses a safety risk if directly emitted without effective separation and proper disposal, and its inclusion in the recovery system affects the purity of ammonia products. Current technological solutions lack an intelligent design that can effectively enrich and separate low-concentration hydrogen within an integrated system, and link it to safe combustion treatment.

[0006] Based on this, a multi-stage wastewater treatment system for pollution control is proposed. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art by proposing a multi-stage wastewater treatment system for pollution control.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A multi-stage wastewater treatment system for pollution control includes a flat wastewater transport passage for transporting wastewater. Multiple absorption tanks for ammonia absorption are installed on the wastewater transport passage. Each absorption tank contains a waste gas collection and transport duct. A heat exchange absorption hood is installed above the waste gas collection and transport duct. The heat exchange absorption hood is connected to a conversion absorption plate via a conversion device. Multiple heat exchange channels are opened on the conversion absorption plate, and heat exchange components are installed within each heat exchange channel. A transport impeller for driving the flow of exhaust gas is installed within the conversion absorption plate. The top of the heat exchange absorption hood is provided with a re-stage conveying gas duct, which is connected to the absorption water tank through an ammonia gas conveying pipe. The top of the re-stage conveying gas duct is provided with a hydrogen gathering hood, which is connected to a combustion device through a mixing gas collection pipe. The bottom of the combustion device is provided with a generated water conveying pipe connected to the heat exchange absorption hood. The combustion device is connected to the wastewater conveying passage through a heat exchange system.

[0009] As a preferred embodiment, the exhaust gas collection and conveying duct is provided with return ports on both sides, the exhaust gas collection and conveying duct located outside the return ports is provided with a return groove, and the exhaust gas collection and conveying duct sidewall located inside the return ports is provided with a layer-by-layer guide component, the bottom of which is located at the return port.

[0010] As a preferred embodiment, the conversion device includes a conversion regulating motor mounted on the heat exchange absorption hood, the output end of the conversion regulating motor is connected to a conversion gear, the end of the conversion absorption disk is provided with a mounting cover, and the mounting cover is provided with a conversion gear ring that meshes with the conversion gear.

[0011] As a preferred embodiment, the heat exchange assembly includes a water-cooled delivery pump installed in the absorption tank, delivery ports densely arranged in the heat exchange channel, interconnected water exchange chambers arranged around the delivery ports, a delivery cover at the end of the heat exchange absorption hood, a water flow interface on the delivery cover, and adapter corresponding ports at both ends of the conversion absorption plate that communicate with the water exchange chambers and are adapted to the water flow interface. The water-cooled delivery pump is connected to the water flow interface on one side through a water-cooled pipe.

[0012] As a preferred embodiment, the conveying cover is detachably mounted with an installation cover, the installation cover is provided with an installation plate, and multiple conveying impellers are all mounted on the installation plate.

[0013] As a preferred embodiment, the bottom of the mixing and collecting pipe is provided with an inclined oxygen inlet for supplying air, and a plurality of supply ports are provided on one side of the hydrogen gathering hood. The end of the mixing and collecting pipe is connected to the supply ports, and an opening and closing valve is provided at the supply ports.

[0014] As a preferred embodiment, the outer wall of the heat exchange absorption hood is provided with a water generation conveying hood, and the water generation conveying pipe is connected to the water generation conveying hood.

[0015] As a preferred embodiment, a collection port is provided on the waste gas collection and conveying duct located inside the absorption water tank. The collection ports are densely arranged on the inner wall of the waste gas collection and conveying duct and are arranged inclined upward from the outside to the inside.

[0016] As a preferred embodiment, the heat exchange system includes a combustion heat exchanger installed at the combustion device, and a circulating heat exchange network is installed in the wastewater transport passage. The circulating heat exchange network is connected to the combustion heat exchanger through a pump-pressure pipeline, which is used to apply the heat from combustion to heat the wastewater in the wastewater transport passage.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes the waste heat from combustion to heat wastewater, actively promoting the efficient release of dissolved ammonia and hydrogen. The released waste gas is pre-cooled through a dedicated heat exchange channel before being introduced into a low-temperature, sealed absorption tank, significantly increasing the ammonia dissolution rate and absorption efficiency. This results in a higher concentration or purity of ammonia water as a byproduct, achieving effective ammonia resource recovery. Utilizing gas density differences, hydrogen is naturally enriched at the top of the expanded-diameter conveying duct and safely introduced into the combustion device via a controllable valve. Simultaneously, the system's airflow design allows for the re-extraction of unabsorbed waste gas for further treatment, achieving effective purification and recycling of low-concentration hydrogen, ensuring thorough treatment.

[0018] 2. This invention creatively mixes water and ammonia, generated from hydrogen combustion, as a cleaning agent to perform online immersion cleaning of heat exchange channels in operation or standby. This effectively dissolves and removes organic impurities condensed on the heat exchange surface, fundamentally solving the industry problem of easy clogging of core heat exchange components, ensuring long-term continuous and stable system operation, reducing frequent downtime maintenance. The rotatable conversion absorption plate design allows switching between different heat exchange channels. When one group of channels is working, another group can be cleaned or kept on standby simultaneously, realizing an uninterrupted cycle of "working-cleaning-standby" and ensuring the continuity of the processing flow.

[0019] 3. This invention recovers the waste heat generated by hydrogen combustion through a heat exchange system, which is then used to heat wastewater to promote the initial release of waste gas. This design recovers waste heat from the "waste gas treatment end" and supplies it to the "waste gas generation end," greatly reducing the consumption of external energy and realizing the cascade and recycling of energy within the system. Overall energy efficiency is significantly improved. Through the conversion and regulation of the motor, conveying impeller, liquid seal structure, and valve control, the system achieves automated or semi-automated operation of multiple stages, including waste gas conveying, cooling, absorption, hydrogen separation, channel switching, and cleaning fluid introduction and recovery. This reduces the intensity and complexity of manual operation and facilitates management and maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the combined structure of a multi-stage wastewater treatment system for pollution control proposed in this invention; Figure 2 This is a three-dimensional structural diagram of a wastewater multi-treatment system for pollution control proposed in this invention; Figure 3 This is a schematic diagram of the combined state structure of a wastewater multi-treatment system for pollution control proposed in this invention; Figure 4 This is a schematic diagram showing the installation relationship of the absorption tank in a multi-stage wastewater treatment system for pollution control proposed in this invention. Figure 5 This is a schematic cross-sectional view of the waste gas collection and conveying duct in a wastewater multi-treatment system for pollution control proposed in this invention. Figure 6 This is a schematic diagram of the internal structure of the heat exchange absorption hood in a wastewater multi-treatment system for pollution control proposed in this invention. Figure 7 This is a schematic diagram of the cross-sectional structure of the mixing and gas collection pipe in a wastewater multi-treatment system for pollution control proposed in this invention. Figure 8 This is a flowchart of a wastewater multi-treatment system for pollution control proposed in this invention.

[0021] In the diagram: 1. Absorption tank; 2. Waste gas collection and conveying duct; 3. Heat exchange absorption hood; 4. Conversion absorption plate; 5. Conveying impeller; 6. Secondary conveying duct; 7. Hydrogen gathering hood; 8. Mixing and collecting pipe; 9. Combustion device; 10. Generated water conveying pipe; 11. Return port; 12. Return trough; 13. Layer-by-layer guide component; 14. Conversion regulating motor; 15. Conversion gear; 16. Mounting cover; 17. Conveying sleeve; 18. Water exchange chamber; 19. Conveying cover; 20. Water flow interface; 21. Mounting cover; 22. Mounting plate; 23. Slanted oxygen inlet; 24. Generated water conveying hood; 25. Concentration port; 26. Ammonia conveying pipe; 27. Wastewater conveying passage; 28. Combustion heat exchanger; 29. ​​Circulating heat exchange network; 30. Pump pressure pipe. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Example, refer to Figures 1 to 8 A multi-stage wastewater treatment system for pollution control includes a flat wastewater transport passage 27 for transporting wastewater. Multiple absorption tanks 1 for ammonia absorption are installed on the wastewater transport passage 27. The water in the absorption tanks 1 is low-temperature water. The absorption tanks 1 are sealed to prevent the ammonia from being quickly absorbed after contact with water and to prevent it from leaking out. A re-stage transport air duct 6 is provided on the top of the heat exchange absorption hood 3. The re-stage transport air duct 6 is connected to the absorption tanks 1 through an ammonia transport pipe 26. After heat exchange, the temperature of the ammonia is significantly reduced. When it is transported to the absorption tanks 1 and comes into contact with the low-temperature water, the efficiency of its conversion into ammonia water can be significantly improved. The ammonia transport pipe 26 can make full contact with the water in the absorption tanks 1 in the form of air bubbles. The absorption tank 1 is equipped with a waste gas collection and conveying duct 2. A waste gas conveying pipe is connected to one side of the waste gas collection and conveying duct 2. Some combustible gases generated during the wastewater treatment process are transported to the waste gas collection and conveying duct 2 through the waste gas conveying pipe for simultaneous treatment. Furthermore, return ports 11 are opened on both sides of the waste gas collection and conveying duct 2. A return groove 12 is set on the waste gas collection and conveying duct 2 outside the return port 11. A layer-by-layer guide component 13 is set on the side wall of the waste gas collection and conveying duct 2 inside the return port 11. The bottom of the layer-by-layer guide component 13 is at the return port 11. The layer-by-layer guide component 13 is composed of multiple sets of inclined guide vanes. This structure does not affect the upward conveying of gas, but also enables the recovery of ammonia water in the cleaning heat exchange channel into the return port 11.

[0026] It should be noted that the height of the cooling water in the absorption tank 1 is the same as the top of the return port 11 in the return tank 12. This means that the cooling water can achieve liquid sealing of the return port 11, and can also recover the generated water after hydrogen combustion and the ammonia water after further reaction.

[0027] A heat exchange absorption hood 3 is installed above the exhaust gas collection and conveying duct 2. The heat exchange absorption hood 3 is connected to a conversion absorption plate 4 through a conversion device. Further, the conversion device includes a conversion adjustment motor 14 installed on the heat exchange absorption hood 3. The output end of the conversion adjustment motor 14 is connected to a conversion gear 15. The end of the conversion absorption plate 4 is provided with a mounting cover 16. A conversion gear ring that meshes with the conversion gear 15 is provided on the mounting cover 16. With the conversion device in place, when it is necessary to switch the heat exchange channel, the conversion adjustment motor 14 can drive the conversion gear 15 to rotate, thereby driving the mounting cover 16 connected to the conversion gear ring to rotate, so as to realize the rotation of the conversion absorption plate 4.

[0028] Multiple heat exchange channels are provided on the conversion absorption plate 4, and heat exchange components are provided in the heat exchange channels. Further, the heat exchange components include a water-cooled delivery pump installed in the absorption water tank 1. The water-cooled delivery pump is connected to hot water for water exchange and delivers the hot water to the water exchange chamber 18 to effectively dissipate heat from the gas passing through the delivery sleeve 17. The heat exchange channel is densely equipped with conveying sleeves 17, and the periphery of the conveying sleeves 17 is equipped with interconnected water exchange chambers 18. The heat exchange absorption hood 3 is equipped with a conveying cover 19 at its end, and a water flow interface 20 is provided on the conveying cover 19. The conversion absorption plate 4 is equipped with matching ports at both ends that are connected to the water exchange chamber 18 and adapted to the water flow interface 20. The water-cooled conveying pump is connected to the water flow interface 20 on one side through a water-cooled pipe. The advantage of the above structure is that the water flow interface 20 on the conveying cover 19 is located at the top and bottom. When the conversion absorption plate 4 rotates, the matching port in the upper and lower heat exchange channels matches the position of the water flow interface 20, thereby ensuring that the cooling water delivered by the water-cooled conveying pump only acts in the water exchange chamber 18 in the upper and lower heat exchange channels.

[0029] The conversion absorption plate 4 is equipped with a conveying impeller 5 for driving the flow of exhaust gas. The conveying cover 19 is detachably mounted with an installation cover 21, and an installation plate 22 is provided on the installation cover 21. Multiple conveying impellers 5 are mounted on the installation plate 22. The advantage of detachable installation is that it is convenient for maintenance. By setting the conveying impellers 5, the exhaust gas below can be driven to be conveyed upward.

[0030] A hydrogen collection hood 7 is installed at the top of the secondary delivery gas duct 6. The hydrogen collection hood 7 is connected to a combustion device 9 through a mixing and collecting pipe 8. The combustion device 9 is existing technology and will not be described in detail here. The hydrogen collection hood 7 is located at the top. The hydrogen in the ammonia is lighter and will float at the top. When the heat exchange absorption hood 3 is closed, the hydrogen will accumulate at the top, thereby satisfying the removal of hydrogen and ammonia. The low concentration of hydrogen will continue to circulate until the concentration meets the treatment requirements.

[0031] Furthermore, an inclined oxygen inlet 23 is provided at the bottom of the mixing and collecting pipe 8 for supplying air. Under the pressure of the mixing and collecting pipe 8 when it is open, the inclined oxygen inlet 23 will draw outside air into the mixing and collecting pipe 8 to meet the oxygen demand for combustion. Multiple delivery ports are provided on one side of the hydrogen gathering hood 7. The end of the mixing and collecting pipe 8 is connected to the delivery port. An opening and closing valve is provided at the delivery port. When the opening and closing valve is open, the hydrogen gathered at the top will be delivered. According to calculations, the opening and closing time of the opening and closing valve can be designed according to the concentration of hydrogen.

[0032] The bottom of the combustion device 9 is equipped with a water generation pipeline 10 connected to the heat exchange absorption hood 3. Further, a water generation hood 24 is provided on the outer wall of the heat exchange absorption hood 3. The water generation pipeline 10 is connected to the water generation hood 24. It should be noted that the water generation pipeline 10 is set on both sides of the workstation. When the adjacent heat exchange channel is in a vertical state, the heat exchange channel is on both sides. At this time, the water generation hood 24 located on the rotated side heat exchange channel will transport the product water after hydrogen combustion to the heat exchange channel. At this time, the water generation in the heat exchange channel will react with ammonia to generate ammonia water. The ammonia water is concentrated in the heat exchange channel and will effectively soak the heat exchange components in the heat exchange channel. Ammonia water (especially concentrated ammonia water) is a good alkaline cleaning agent. It can effectively clean certain organic substances (such as certain oily or organic substances in indigo production) that clog the tail gas system of indigo production, thereby effectively avoiding the clogging of the heat exchange components.

[0033] Furthermore, a concentration port 25 is provided on the waste gas collection and conveying duct 2 located in the absorption tank 1. The concentration ports 25 are densely arranged on the inner wall of the waste gas collection and conveying duct 2 and are inclined upward from the outside to the inside. Under this arrangement, the suction force generated by the gas in the waste gas collection and conveying duct 2 during the flow will act on the concentration port 25, thereby drawing the ammonia and impurity hydrogen that have not been fully absorbed in the absorption tank 1 from the concentration port 25 into the waste gas collection and conveying duct 2 for further treatment (equivalent to purifying the hydrogen).

[0034] The combustion device 9 is connected to the wastewater conveying passage 27 via a heat exchange system. The heat exchange system includes a combustion heat exchanger 28 installed at the combustion device 9. A circulating heat exchange net 29 is installed in the wastewater conveying passage 27. The circulating heat exchange net 29 is connected to the combustion heat exchanger 28 via a pump pressure pipe 30, which is used to apply the heat of combustion to heat the wastewater in the wastewater conveying passage 27. The pump pressure pipe 30 is connected to a circulating pump for circulation within the heat exchange system.

[0035] In the purification of production wastewater, the wastewater is slowly transported within the wastewater transport passage 27. During this transport, some waste gas may escape, and due to the airtightness of the wastewater transport passage 27, it can only escape into the waste gas collection and transport duct 2. When it reaches the circulating heat exchanger 29, it is heated by the heat from the circulating heat exchanger 29. During heating, some gases whose solubility is significantly affected by temperature, such as ammonia (free ammonia) and hydrogen gas that is insoluble in water and exists alone in the treated wastewater, will escape in large quantities and be collected and transported. The exhaust gas is sent to the exhaust gas collection and conveying duct 2. The exhaust gas is conveyed in the exhaust gas collection and conveying duct 2 and then to the heat exchange channel of the conversion absorption plate 4 in the heat exchange absorption hood 3. The exhaust gas is cooled by the heat exchange components set in the heat exchange channel door. The cooled exhaust gas is then conveyed upward through the re-stage conveying duct 6. At this time, the volume of the re-stage conveying duct 6 is larger than that of the initial stage, which causes the exhaust gas to slow down here. A small amount of hydrogen gas with lower density and smaller specific gravity will float at the top during the flow and concentrate at the hydrogen accumulation hood 7, which cannot be reached by the flow path. Ammonia gas is transported to the absorption water tank 1 via the ammonia gas delivery pipe 26. In the absorption water tank 1, it will come into full contact with the cooling water (the lower the temperature, the higher the solubility of ammonia gas). The ammonia gas gradually dissolves in the water, and the ammonia water is collected. The unabsorbed ammonia gas and hydrogen gas will accumulate in the absorption water tank 1. Under the suction of the airflow in the waste gas collection and delivery duct 2, the unabsorbed ammonia gas and hydrogen gas will be transported again to the heat exchange absorption hood 3 through the collection port 25 opened on the waste gas collection and delivery duct 2, so as to achieve the re-treatment of the unabsorbed ammonia gas. After the exhaust gas has been treated for a period of time, the conversion and adjustment motor 14 can be used to control the rotation of the conversion absorption plate 4 set in the heat exchange absorption hood 3, so as to change the heat exchange components in the heat exchange channel. After use, certain impurities will accumulate in the heat exchange channel. At this time, the liquid after hydrogen combustion can be transported to the heat exchange channel through the water generation pipeline 10. The water in the heat exchange channel will react with ammonia to generate ammonia water. The ammonia water is concentrated in the heat exchange channel and will effectively soak the heat exchange components in the heat exchange channel. It can effectively clean some organic matter that blocks the tail gas system of indigo production. In the vertical direction of the next rotation, it will be automatically guided to the return port 11 through the layer-by-layer guide 13 to realize the recovery and treatment of the products after hydrogen combustion.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wastewater multi-stage treatment system for pollution control, comprising a flat wastewater transport passage (27) for wastewater transport, wherein multiple absorption tanks (1) for ammonia absorption treatment are provided on the wastewater transport passage (27), characterized in that, The absorption tank (1) is provided with a waste gas collection and conveying channel (2), and a heat exchange absorption hood (3) is provided above the waste gas collection and conveying channel (2). The heat exchange absorption hood (3) is connected to a conversion absorption plate (4) through a conversion device. Multiple heat exchange channels are provided on the conversion absorption plate (4). Heat exchange components are provided in the heat exchange channels. A conveying impeller (5) for driving the flow of exhaust gas is provided in the conversion absorption plate (4). The heat exchange absorption hood (3) is provided with a re-stage conveying gas duct (6) at the top. The re-stage conveying gas duct (6) is connected to the absorption water tank (1) through an ammonia gas conveying pipe (26). The re-stage conveying gas duct (6) is provided with a hydrogen gathering hood (7) at the top. The hydrogen gathering hood (7) is connected to a combustion device (9) through a mixing gas collection pipe (8). The combustion device (9) is provided with a generated water conveying pipe (10) at the bottom that is connected to the heat exchange absorption hood (3). The combustion device (9) is connected to the wastewater conveying passage (27) through a heat exchange system.

2. The wastewater multi-treatment system for pollution control according to claim 1, characterized in that, The exhaust gas collection and conveying duct (2) has return ports (11) on both sides. The exhaust gas collection and conveying duct (2) located outside the return ports (11) is provided with a return groove (12). The exhaust gas collection and conveying duct (2) located inside the return ports (11) is provided with a layer-by-layer guide (13) on the side wall. The bottom of the layer-by-layer guide (13) is located at the return port (11).

3. The wastewater multi-treatment system for pollution control according to claim 1, characterized in that, The conversion device includes a conversion regulating motor (14) mounted on the heat exchange absorption hood (3), the output end of the conversion regulating motor (14) is connected to a conversion gear (15), the end of the conversion absorption disk (4) is provided with a mounting cover (16), and the mounting cover (16) is provided with a conversion gear ring that meshes with the conversion gear (15).

4. The wastewater multi-treatment system for pollution control according to claim 1, characterized in that, The heat exchange assembly includes a water-cooled delivery pump installed in the absorption tank (1), delivery sleeves (17) are densely arranged in the heat exchange channel, and water exchange chambers (18) are interconnected around the delivery sleeves (17). A delivery cover (19) is provided at the end of the heat exchange absorption cover (3), and a water flow interface (20) is provided on the delivery cover (19). Both ends of the conversion absorption plate (4) are provided with matching ports that are connected to the water exchange chamber (18) and adapted to the water flow interface (20). The water-cooled delivery pump is connected to the water flow interface (20) on one side through a water-cooled pipe.

5. The wastewater multi-treatment system for pollution control according to claim 4, characterized in that, The conveying cover (19) is detachably mounted with an installation cover (21), and an installation plate (22) is provided on the installation cover (21). Multiple conveying impellers (5) are provided on the installation plate (22).

6. The wastewater multi-treatment system for pollution control according to claim 1, characterized in that, The bottom of the mixing gas collection pipe (8) is provided with an inclined oxygen inlet (23) for transporting air. The hydrogen gathering hood (7) has multiple delivery ports on one side. The end of the mixing gas collection pipe (8) is connected to the delivery port, and an opening and closing valve is provided at the delivery port.

7. The wastewater multi-treatment system for pollution control according to claim 1, characterized in that, The outer wall of the heat exchange absorption hood (3) is provided with a water generation conveying hood (24), and the water generation conveying pipe (10) is connected to the water generation conveying hood (24).

8. The wastewater multi-treatment system for pollution control according to claim 1, characterized in that, A collection port (25) is provided on the waste gas collection and conveying duct (2) located in the absorption water tank (1). The collection ports (25) are densely arranged on the inner wall of the waste gas collection and conveying duct (2) and are arranged in an upward and inward direction.

9. A wastewater multi-treatment system for pollution control according to claim 1, characterized in that, The heat exchange system includes a combustion heat exchanger (28) installed at the combustion device, and a circulating heat exchange net (29) installed in the wastewater transport passage (27). The circulating heat exchange net (29) is connected to the combustion heat exchanger (28) through a pump pressure pipe (30) to heat the wastewater in the wastewater transport passage (27) by applying the heat of combustion.

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