Closed liquid-carrying waste gas treatment device

Abstract

Belonging to the technical field of three waste gas treatment, the invention discloses a closed liquid-carrying waste gas treatment device, which comprises a first waste gas pipeline and a combined waste gas and waste liquid tank connected with the first waste gas pipeline, and a first hand valve and a second hand valve are arranged on the first waste gas pipeline. The device is characterized in that a redirection folded plate, a liquid level meter, a pressure gauge, a thermometer and a breather valve are installed in the combined waste gas and waste liquid tank, and a waste gas treatment system and a waste liquid treatment system are installed on the combined waste gas and waste liquid tank. Gas is sent to the internal mixing type waste liquid gun from the first waste gas pipeline and then is mixed with steam to be sprayed into the combustion tower for combustion treatment, and separated waste liquid is accumulated at the bottom of the combined waste gas and waste liquid tank and is pumped out through the delivery pump for treatment.

Description

Technical Field

[0001] This invention belongs to the field of waste treatment technology, specifically relating to a closed-loop liquid-containing waste gas treatment device. Background Technology

[0002] Environmental protection requirements for waste gas treatment in chemical enterprises are extremely strict and industry-specific, mainly focusing on the control of complex pollutant components, management of fugitive emissions, and whole-process treatment. The Air Pollution Prevention and Control Law clearly stipulates that chemical enterprises must install high-efficiency purification devices to ensure that waste gas emissions meet standards. VOCs total control is implemented in key areas, and exceeding the total emission limit is prohibited. In the requirements for organized waste gas treatment, corresponding treatment methods are proposed for different types of pollutants, and closed-loop management requirements are proposed for waste gas emission control.

[0003] The process monitoring and management requirements stipulate the installation of online monitoring systems to transmit data to environmental protection departments in real time. The whole-process management requirements put forward relevant requirements for end-of-pipe treatment upgrades, eliminating inefficient technologies such as single activated carbon adsorption and promoting efficient combined processes such as incineration and catalytic oxidation. In addition, the requirements stipulate that the synchronous operation rate of treatment facilities must be ≥95%.

[0004] Currently, conventional waste gas incineration facilities are equipped with waste gas spray guns that do not have liquid atomization capabilities. When treating waste gas containing liquid, they cannot ensure the complete combustion of liquid droplets, which can easily lead to excessive levels of environmental indicators such as particulate matter and non-methane total hydrocarbons in the flue gas, causing environmental incidents. If manual liquid cutting is adopted, it will lead to the inability to implement closed management, which can easily cause liquid spillage and the escape of volatile gases, resulting in secondary pollution such as pollution of the working environment and excessive VOCs in the surrounding air, threatening the health of operators. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a closed-loop waste gas treatment device with liquid in it, which solves the technical problem that the combustion of liquid droplets carried by the waste gas cannot ensure that the particulate matter generated by the combustion of the waste gas exceeds the environmental protection limit.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a closed-type waste gas treatment device with liquid, comprising a first waste gas pipeline and a combined waste gas and waste liquid tank connected to the first waste gas pipeline, wherein a first manual valve and a second manual valve are arranged on the first waste gas pipeline, characterized in that: a deflector baffle, a level gauge, a pressure gauge, a thermometer and a breather valve are installed in the combined waste gas and waste liquid tank, and a waste gas treatment system and a waste liquid treatment system are installed on the combined waste gas and waste liquid tank.

[0007] Further: The exhaust gas treatment system includes a second exhaust gas pipeline, which is connected to a combined exhaust gas and waste liquid tank. A third manual valve is arranged on the second exhaust gas pipeline. The first exhaust gas pipeline and the second exhaust gas pipeline are connected by a branch pipeline, and a fourth manual valve is arranged on the branch pipeline. A drain line is connected to the bottom of the combined exhaust gas and waste liquid tank, and a drain valve is arranged on the drain line.

[0008] Furthermore: the waste liquid treatment system includes a waste liquid extraction pipeline, one end of which is connected to a combined waste gas and waste liquid tank, and the other end is connected to the inlet of a first delivery pump. A fifth hand valve and a first inlet filter are arranged on the waste liquid extraction pipeline. The outlet of the first delivery pump is connected to a first external discharge pipeline. A first check valve and an external discharge valve are arranged on the first external discharge pipeline. The first external discharge pipeline is connected to an internal mixing waste liquid gun. The internal mixing waste liquid gun is equipped with a steam pipeline. A sixth hand valve is arranged on the steam pipeline. A return pipeline is led out from the first external discharge pipeline and connected to the combined waste gas and waste liquid tank. A seventh hand valve is arranged on the return pipeline.

[0009] Furthermore: a spare pipeline is led out from the inlet side of the waste liquid extraction pipeline and connected to the second transfer pump. The outlet of the second transfer pump is connected to the rear side of the first outlet valve of the first discharge pipeline through the second discharge pipeline. A second check valve and a second inlet filter are arranged on the second discharge pipeline.

[0010] Furthermore, the combined waste gas and waste liquid tank is equipped with a corrugated baffle plate inside.

[0011] Furthermore, exhaust valves are also installed on the first and second external exhaust pipelines.

[0012] Furthermore, a flow meter and regulating valve are also installed on the first external discharge pipeline.

[0013] Compared with the prior art, the present invention has the following advantages: By using a redirecting baffle to obstruct the liquid-laden waste gas entering the combined waste gas and waste liquid tank, the redirecting baffle converts the linear kinetic energy of the waste gas into rotational kinetic energy, forcing the liquid-laden gas to form a rotating vortex along the baffle surface of the redirecting baffle 10 within the combined separation tank. During the rotational motion, droplets with a density greater than that of gas are centrifugally thrown towards the tank wall of the combined waste gas and waste liquid tank, and after coalescence, they settle to the bottom of the combined waste gas and waste liquid tank under the influence of gravity, completing a process. The secondary gas-liquid separation uses corrugated baffles. Liquid-laden gas rises into the flow channel formed by the grooves between the corrugated baffle plates. Due to the obstruction of the grooves, the direction of the gas is constantly changed. The tiny droplets in the liquid-laden gas, because their mass is greater than that of the gas, cannot change direction quickly with the gas. Therefore, the droplets adhere to the surface of the corrugated baffles, coalesce, and drip downwards into the bottom of the combined waste gas and waste liquid tank, achieving deep gas-liquid separation. The waste gas treatment system and waste liquid treatment system are fully enclosed during the dehydration process of liquid-laden waste gas to prevent leakage of liquid-laden waste gas. Attached Figure Description

[0014] Figure 1 This is a process flow diagram of Embodiment 1 of the present invention;

[0015] Figure 2 This is a process flow diagram of Embodiment 2 of the present invention;

[0016] Figure 3 This is a process flow diagram of Embodiment 3 of the present invention.

[0017] In the diagram: 1. Combined waste gas and waste liquid tank; 2. First waste gas pipeline; 3. First hand valve; 4. Liquid level gauge; 5. Pressure gauge; 6. Second hand valve; 7. Thermometer; 8. Waveform baffle; 9. Breathing valve; 10. Diversion baffle; 11. Second waste gas pipeline; 12. Third hand valve; 13. Branch pipeline; 14. Fourth hand valve; 15. Drain pipeline; 16. Drain valve; 17. Waste liquid extraction pipeline; 18. First transfer pump; 19. Fifth... 20. Hand valve; 21. First inlet filter; 22. First external discharge pipeline; 23. First check valve; 24. External discharge valve; 25. Second inlet filter; 26. Internal mixing waste liquid gun; 28. Steam pipeline; 29. ​​Sixth hand valve; 30. Return pipeline; 31. Seventh hand valve; 32. Backup pipeline; 33. Second transfer pump; 34. Second external discharge pipeline; 35. Second check valve; 37. Exhaust valve; 39. Flow meter; 40. Regulating valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0019] Example 1:

[0020] like Figure 1 As shown, a closed-loop waste gas treatment device with liquid includes a first waste gas pipeline 2 and a combined waste gas and waste liquid tank 1 connected to the first waste gas pipeline 2. A first manual valve 3 and a second manual valve 6 are arranged on the first waste gas pipeline 2. The device is characterized in that a deflector baffle 10, a level gauge 4, a pressure gauge 5, a thermometer 7 and a breather valve 9 are installed in the combined waste gas and waste liquid tank 1. A waste gas treatment system and a waste liquid treatment system are installed on the combined waste gas and waste liquid tank 1.

[0021] In the above technical solution, the first waste gas pipeline 2 is used to connect various production equipment in the factory area. The waste gas generated by the production equipment is collected in the first waste gas pipeline 2. The liquid-containing waste gas is sent to the combined waste gas and waste liquid tank 1 through the first waste gas pipeline 2. A first hand valve 3 and a second hand valve 6 are installed on the first waste gas pipeline 2. The second hand valve 6 is normally open. Multiple first hand valves 3 can be installed on the first waste gas pipeline 2 as backups. The backup valves are normally open. The combined waste gas and waste liquid tank 1 is used to separate the liquid-containing waste gas. A deflector baffle 10 is installed on the inner wall of the combined waste gas and waste liquid tank 1. The deflector baffle 10 is installed at the outlet of the first waste gas pipeline 2. After the liquid-containing waste gas enters the combined waste gas and waste liquid tank 1 from the first waste gas pipeline 2, it first impacts the deflector baffle 10. The deflector baffle 10 converts the linear kinetic energy of the waste gas into vortex energy. Rotational energy forces the liquid-laden gas to form a rotating vortex along the deflector plate 10 within the combined separation tank 1. During this rotational motion, droplets with a density greater than that of the gas are centrifugally thrown towards the tank wall of the combined waste gas and waste liquid tank 1. After coalescence, they are attracted by gravity and sink to the bottom of the combined waste gas and waste liquid tank 1. The level gauge 4, pressure gauge 5, and thermometer 7 installed on the combined waste gas and waste liquid tank 1 are both remote and local types, namely, remote level gauge, local level gauge, remote pressure gauge and local pressure gauge, remote thermometer and local thermometer. The level gauge 4, pressure gauge 5, and thermometer 7 are used to monitor and control the waste liquid level, tank pressure, and waste liquid temperature in the combined waste gas and waste liquid tank 1 in real time. The breather valve 9 installed on the top of the combined waste gas and waste liquid tank 1 is used to control the tank pressure.

[0022] The combined waste gas and waste liquid tank 1 is equipped with a corrugated baffle 8 inside;

[0023] In the above technical solution: the corrugated baffle plate 8 is composed of closely arranged plates with grooves. The liquid-laden gas rises into the flow channel formed by the grooves between the plates and is blocked by the grooves, constantly changing direction. The tiny liquid droplets in the liquid-laden gas cannot change direction quickly with the gas because their mass is greater than that of the gas. Therefore, the droplets adhere to the surface of the corrugated baffle plate 8 and agglomerate before dripping downwards into the bottom of the combined waste gas and waste liquid tank 1, achieving maximum separation of waste liquid.

[0024] The exhaust gas treatment system includes a second exhaust gas pipeline 11, which is connected to a combined exhaust gas and waste liquid tank 1. A third manual valve 12 is arranged on the second exhaust gas pipeline 11. The first exhaust gas pipeline 2 is connected to the second exhaust gas pipeline 11 through a branch pipeline 13. A fourth manual valve 14 is arranged on the branch pipeline 13. A drain line 15 is connected to the bottom of the combined exhaust gas and waste liquid tank 1, and a drain valve 16 is arranged on the drain line 15.

[0025] In the above technical solution: the second waste gas pipeline 11 is installed on the top of the combined waste gas and waste liquid tank 1 to discharge the waste gas after gas-liquid separation. The third hand valve 12 is installed on the second waste gas pipeline 11. The third hand valve 12 is normally open when the equipment is running. The waste gas after gas-liquid separation is sent to the incinerator for incineration through the second waste gas pipeline 11. After the drain valve 16 is opened, the separated waste liquid is sent to centralized treatment through the drain pipeline 15. One end of the branch pipeline 13 is connected to the second waste gas pipeline 11, and the other end of the branch pipeline 13 is connected to the first waste gas pipeline 2 between the first hand valve 3 and the second hand valve 6.

[0026] During commissioning and maintenance of the combined waste gas and waste liquid tank 1, close the second hand valve 6 and open the fourth hand valve 14. The liquid-laden gas is sent to the second waste gas pipeline 11 through the first waste gas pipeline 2 and the branch pipeline 13.

[0027] By adopting the above technical solution, the implementation method of the present invention is as follows: After opening the first hand valve 3, the liquid-laden waste gas is sent to the combined waste gas and waste liquid tank 1 through the first waste gas pipe 2. The liquid-laden waste gas entering the combined waste gas and waste liquid tank 1 is obstructed by the deflector baffle 10, causing the waste gas to swirl upward in the combined waste gas and waste liquid tank 1, realizing the first gas-liquid separation of the liquid-laden waste gas. After the waste gas is separated by the first gas-liquid separation, it rises to the corrugated baffle 8 inside the combined waste gas and waste liquid tank 1, realizing the second gas-liquid deep separation. After opening the third hand valve 12, the waste gas after deep separation is sent to the incinerator for incineration through the second waste gas pipe 11 at the top of the combined waste gas and waste liquid tank 1, avoiding the problem of abnormal environmental indicators of incineration flue gas due to the combustion of liquid-laden waste gas.

[0028] Example 2:

[0029] like Figure 2 As shown, a closed-loop waste gas treatment device with liquid includes a first waste gas pipeline 2 and a combined waste gas and waste liquid tank 1 connected to the first waste gas pipeline 2. A first manual valve 3 and a second manual valve 6 are arranged on the first waste gas pipeline 2. The device is characterized in that: a deflector baffle 10, a level gauge 4, a pressure gauge 5, a thermometer 7 and a breather valve 9 are installed inside the combined waste gas and waste liquid tank 1. A corrugated baffle 8 is also provided inside the combined waste gas and waste liquid tank 1. A waste gas treatment system and a waste liquid treatment system are installed on the combined waste gas and waste liquid tank 1.

[0030] The exhaust gas treatment system includes a second exhaust gas pipeline 11, which is connected to a combined exhaust gas and waste liquid tank 1. A third manual valve 12 is arranged on the second exhaust gas pipeline 11. The first exhaust gas pipeline 2 is connected to the second exhaust gas pipeline 11 through a branch pipeline 13. A fourth manual valve 14 is arranged on the branch pipeline 13. A drain line 15 is connected to the bottom of the combined exhaust gas and waste liquid tank 1, and a drain valve 16 is arranged on the drain line 15.

[0031] The waste liquid treatment system includes a waste liquid extraction pipeline 17, one end of which is connected to a combined waste gas and waste liquid tank 1, and the other end is connected to the inlet of a first delivery pump 18. A fifth hand valve 19 and a first inlet filter 20 are arranged on the waste liquid extraction pipeline 17. The outlet of the first delivery pump 18 is connected to a first external discharge pipeline 21. A first one-way valve 22 and an external delivery valve 24 are arranged on the first external discharge pipeline 21. The first external discharge pipeline 21 is connected to an internal mixing waste liquid tank 26. The internal mixing waste liquid tank 26 is equipped with a steam pipeline 28. A sixth hand valve 29 is arranged on the steam pipeline 28. A return pipeline 30 is led out from the first external discharge pipeline 21 and connected to the combined waste gas and waste liquid tank 1. A seventh hand valve 31 is arranged on the return pipeline 30.

[0032] In the above technical solution: one end of the waste liquid extraction pipe 17 is connected to the lower part of the combined waste gas and waste liquid tank 1, and the other end of the waste liquid extraction pipe 17 is connected to the inlet side of the first conveying pump 18. The waste liquid in the combined waste gas and waste liquid tank 1 is extracted by the first conveying pump 18 and sent to the internal mixing waste liquid gun 26 through the first external discharge pipeline 21. A fifth hand valve 19 and an inlet filter 20 are arranged on the waste liquid extraction pipe 17. The extracted waste liquid is filtered and impurities are removed by the inlet filter 20. A fifth hand valve 19 and an inlet filter 20 are arranged on the first external discharge pipeline 21. A one-way valve 22 and an external discharge valve 24 are provided. The first one-way valve 22 is used to organize the reflux of waste liquid. The external discharge valve 24 is opened during operation. The waste liquid drawn by the first delivery pump 18 is sent to the internal mixing waste liquid gun 26 through the first external discharge pipeline 21. At the same time, the sixth hand valve 29 is opened. The internal mixing waste liquid gun 26 introduces high-pressure steam from the steam pipeline 28. The high-pressure steam and waste liquid collide violently in the waste liquid gun to form a vapor-liquid mixture. The mixture is then sprayed into the combustion furnace at high speed through the nozzle orifice to achieve instantaneous vaporization and generate fine mist droplets, thereby achieving complete combustion and achieving emission standards.

[0033] A spare pipeline 32 is led out from the inlet side of the waste liquid extraction pipeline 17 and connected to the second delivery pump 33. The outlet of the second delivery pump 33 is connected to the rear side of the first outlet valve 23 of the first discharge pipeline 21 through the second discharge pipeline 34. A second check valve 35 and a second inlet filter 25 are arranged on the second discharge pipeline 34. An exhaust valve 37 is also arranged on the first discharge pipeline 21 and the second discharge pipeline 34. By adopting the above technical solution as a spare for the waste liquid extraction pipeline 17, maintenance is convenient.

[0034] By adopting the above technical solution, the implementation method of the present invention is as follows: the separated waste liquid falls into the lower part of the combined waste gas and waste liquid tank 1, the fifth hand valve 19, the first one-way valve 22 and the external delivery valve 24 are opened, the first delivery pump 18 is started to extract the waste liquid in the combined waste gas and waste liquid tank 1 and send it into the internal mixing waste liquid gun 26 through the waste liquid extraction pipe 17 and the first external discharge pipe 21, the sixth hand valve 29 is opened to introduce high pressure steam from the outside, the high pressure steam collides and mixes with the waste liquid in the internal mixing waste liquid gun 26, and the gas-liquid mixture in the internal mixing waste liquid gun is sprayed out at high speed through the nozzle to form fine mist droplets that enter the incinerator for combustion treatment.

[0035] Example 3:

[0036] like Figure 3 As shown, a closed-loop waste gas treatment device with liquid includes a first waste gas pipeline 2 and a combined waste gas and waste liquid tank 1 connected to the first waste gas pipeline 2. A first manual valve 3 and a second manual valve 6 are arranged on the first waste gas pipeline 2. The device is characterized in that: a deflector baffle 10, a level gauge 4, a pressure gauge 5, a thermometer 7 and a breather valve 9 are installed inside the combined waste gas and waste liquid tank 1. A corrugated baffle 8 is also provided inside the combined waste gas and waste liquid tank 1. A waste gas treatment system and a waste liquid treatment system are installed on the combined waste gas and waste liquid tank 1.

[0037] The exhaust gas treatment system includes a second exhaust gas pipeline 11, which is connected to a combined exhaust gas and waste liquid tank 1. A third manual valve 12 is arranged on the second exhaust gas pipeline 11. The first exhaust gas pipeline 2 is connected to the second exhaust gas pipeline 11 through a branch pipeline 13. A fourth manual valve 14 is arranged on the branch pipeline 13. A drain line 15 is connected to the bottom of the combined exhaust gas and waste liquid tank 1, and a drain valve 16 is arranged on the drain line 15.

[0038] The waste liquid treatment system includes a waste liquid extraction pipeline 17, one end of which is connected to a combined waste gas and waste liquid tank 1, and the other end is connected to the inlet of a first delivery pump 18. A fifth hand valve 19 and a first inlet filter 20 are arranged on the waste liquid extraction pipeline 17. The outlet of the first delivery pump 18 is connected to a first external discharge pipeline 21. A first one-way valve 22 and an external delivery valve 24 are arranged on the first external discharge pipeline 21. The first external discharge pipeline 21 is connected to an internal mixing waste liquid tank 26. The internal mixing waste liquid tank 26 is equipped with a steam pipeline 28. A sixth hand valve 29 is arranged on the steam pipeline 28. A return pipeline 30 is led out from the first external discharge pipeline 21 and connected to the combined waste gas and waste liquid tank 1. A seventh hand valve 31 is arranged on the return pipeline 30.

[0039] The waste liquid extraction pipeline 17 has a spare pipeline 32 leading out from the inlet side and connected to the second transfer pump 33. The outlet of the second transfer pump 33 is connected to the rear side of the first outlet valve 23 of the first discharge pipeline 21 through the second discharge pipeline 34. A second check valve 35 and a second inlet filter 25 are arranged on the second discharge pipeline 34. An exhaust valve 37 is also arranged on the first discharge pipeline 21 and the second discharge pipeline 34. A flow meter 39 and a regulating valve 40 are also arranged on the first discharge pipeline 21.

[0040] By adopting the above technical solution, one combined use method of the present invention is as follows: After opening the first hand valve 3, the liquid-laden waste gas is sent to the combined waste gas and waste liquid tank 1 through the first waste gas pipe 2. The liquid-laden waste gas entering the combined waste gas and waste liquid tank 1 is obstructed by the deflector baffle 10, causing the waste gas to swirl upward in the combined waste gas and waste liquid tank 1, realizing the first gas-liquid separation of the liquid-laden waste gas. After the waste gas after the first gas-liquid separation rises to the corrugated baffle 8 inside the combined waste gas and waste liquid tank 1, it realizes the second gas-liquid deep separation. After opening the third hand valve 12, the waste gas after deep separation is sent to the incinerator for incineration through the second waste gas pipe 11 at the top of the combined waste gas and waste liquid tank 1, avoiding the problem of abnormal environmental indicators of incineration flue gas due to the combustion of liquid-laden waste gas.

[0041] The separated waste liquid falls into the lower part of the combined waste gas and waste liquid tank 1. The fifth hand valve 19, the first one-way valve 22 and the external discharge valve 24 are opened, and the first delivery pump 18 is started to extract the waste liquid in the combined waste gas and waste liquid tank 1 and send it into the internal mixing waste liquid gun 26 through the waste liquid extraction pipe 17 and the first external discharge pipe 21. The sixth hand valve 29 is opened to introduce high-pressure steam from the outside. The high-pressure steam collides and mixes with the waste liquid in the internal mixing waste liquid gun 26. The gas-liquid mixture in the internal mixing waste liquid gun is sprayed out at high speed through the nozzle to form fine mist droplets that enter the incinerator for combustion.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A closed-loop waste gas treatment device with liquid in it, comprising a first waste gas pipeline (2) and a combined waste gas and waste liquid tank (1) connected to the first waste gas pipeline (2), wherein a first manual valve (3) and a second manual valve (6) are arranged on the first waste gas pipeline (2), characterized in that: A deflector baffle (10), a level gauge (4), a pressure gauge (5), a thermometer (7), and a breather valve (9) are installed inside the combined waste gas and waste liquid tank (1). A waste gas treatment system and a waste liquid treatment system are installed on the combined waste gas and waste liquid tank (1).

2. The closed-loop liquid-containing waste gas treatment device according to claim 1, characterized in that, The waste gas treatment system includes a second waste gas pipeline (11), which is connected to a combined waste gas and waste liquid tank (1). A third hand valve (12) is arranged on the second waste gas pipeline (11). The first waste gas pipeline (2) and the second waste gas pipeline (11) are connected by a branch pipeline (13). A fourth hand valve (14) is arranged on the branch pipeline (13). A drain line (15) is connected to the bottom of the combined waste gas and waste liquid tank (1). A drain valve (16) is arranged on the drain line (15).

3. The closed-loop waste gas treatment device with liquid content according to claim 1, characterized in that, The waste liquid treatment system includes a waste liquid extraction pipe (17), one end of which is connected to a combined waste gas and waste liquid tank (1), and the other end is connected to the inlet of a first delivery pump (18). A fifth hand valve (19) and a first inlet filter (20) are arranged on the waste liquid extraction pipe (17). The outlet of the first delivery pump (18) is connected to a first external discharge pipeline (21). A first check valve (22) and an external delivery valve (24) are arranged on the first external discharge pipeline (21). The first external discharge pipeline (21) is connected to an internal mixing waste liquid pump (26). The internal mixing waste liquid pump (26) is equipped with a steam pipeline (28). A sixth hand valve (29) is arranged on the steam pipeline (28). A return pipeline (30) is led out from the first external discharge pipeline (21) and connected to the combined waste gas and waste liquid tank (1). A seventh hand valve (31) is arranged on the return pipeline (30).

4. The closed-loop waste gas treatment device with liquid content according to claim 3, characterized in that, The waste liquid extraction pipeline (17) has a spare pipeline (32) leading out from the inlet side and connected to the second transfer pump (33). The outlet of the second transfer pump (33) is connected to the rear side of the first outlet valve (23) of the first discharge pipeline (21) through the second discharge pipeline (34). The second discharge pipeline (34) is equipped with a second check valve (35) and a second inlet filter (25).

5. The closed-loop waste gas treatment device with liquid content according to claim 1, characterized in that: The combined waste gas and waste liquid tank (1) is equipped with a corrugated baffle (8) inside.

6. A closed-loop waste gas treatment device with liquid content according to claim 4, characterized in that: An exhaust valve (37) is also arranged on the first external exhaust pipeline (21) and the second external exhaust pipeline (34).

7. A closed-loop waste gas treatment device with liquid content according to claim 6, characterized in that: A flow meter (39) and a regulating valve (40) are also installed on the first external discharge pipeline (21).

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