Low-carbon and high-efficiency purification system for benzoquinone-containing waste gas and control method thereof

Abstract

The present invention discloses a low-carbon and high-efficiency purification system for benzoquinone-containing waste gas, comprising a water-cooled condenser, a blower, a spray tower, a three-phase separator, and a VOCs catalytic reactor which are sequentially arranged along the gas path from the air inlet to the air outlet. The system also comprises a pressure-stabilizing pump for conveying superheated water after heat exchange in the condenser to the spray tower, a sedimentation tank for recovering waste water in the spray tower and the three-phase separator, and a booster pump for conveying clean water produced after precipitation in the sedimentation tank to the condenser, so that the system forms a closed-loop water path capable of providing stable superheated water, further recovering residual heat, and saving water consumption, thereby forming a comprehensive treatment system that treats complex waste gas while taking low carbon into consideration.

Description

Technical Field

[0001] The invention relates to the field of green and low-carbon industrial waste gas treatment, and in particular to the field of comprehensive treatment of benzoquinone-containing waste gas generated in the production of enameled wires. Background Art

[0002] In recent years, the requirements for waste gas emissions from industrial enterprises have continued to increase. In addition to the widespread purification of polluted waste gas, carbon emissions also need to be considered.

[0003] For example, the waste gas treatment involved in the production of enameled wires faces complex problems. During the process, waste gas containing VOCs above 300°C is generated, and the main components of this VOCs are gases containing organic toxic substances such as benzene. Moreover, the volatile benzoquinone has long been ignored by existing technologies. If benzoquinone is not treated, it will have a serious impact on the aquatic ecosystem and directly cause hidden dangers to human health problems.

[0004] In this regard, the broad-spectrum method is to catalytically burn these exhaust gases. However, the cost of catalytic combustion treatment is relatively high, and there are also certain risks and new problems such as the production of carbon dioxide and increased carbon emissions. Moreover, the treatment of VOCs containing para-benzoquinone by catalytic combustion often requires secondary catalytic combustion to meet emission standards. For example, Chinese patent CN211929165U discloses a three-step catalytic combustion scheme. Although the emission requirements meet the standards, the cost also increases. Another way to take effect is filtering, but the use of filter materials leads to high costs, which is not a long-term solution. A low-cost, low-carbon and environmentally friendly exhaust gas treatment solution is needed.

[0005] In this regard, the Chinese patent CN116459644A, a VOCs treatment device for an enameled wire baking process, previously applied by the applicant, discloses a low-cost solution that utilizes the property of benzoquinone being easily soluble in water at high temperatures. However, this solution also needs to be improved in its application, such as the need for electric heating to assist in increasing the dissolution temperature, which increases new carbon emissions. At the same time, the hot water dissolution section and the spray cooling section are carried out separately, and continuous water replenishment is required in the front-end dissolution link, which is also a waste of water resources. This continuous electrical assistance and water replenishment is also a new energy consumption, and there is still a need for further improvement.

[0006] Therefore, how to purify the complex exhaust gas from the enameled wire production line containing benzoquinone at low cost and with low carbon has become a topic that needs to be improved. Summary of the invention

[0007] The present invention provides a low-cost, low-carbon and efficient purification system for treating waste gas containing benzoquinone, which can continuously and stably treat VOCs gases such as benzoquinone.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A low-carbon and high-efficiency purification system for benzoquinone-containing waste gas, comprising an air inlet for waste gas input and an air outlet for discharging purified air, and a water-cooled condenser, a blower, a spray tower, a three-phase separator, and a VOCs catalytic reactor are sequentially arranged along the air path from the air inlet to the air outlet;

[0010] It also includes a pressure-stabilizing pump for transporting the superheated water after heat exchange in the condenser to the spray tower, a sedimentation tank for recovering waste water in the spray tower and the three-phase separator, and a booster pump for transporting the clean water produced after precipitation in the sedimentation tank to the condenser;

[0011] A closed-loop circulating water circuit is formed along the condenser, the pressure-stabilizing pump, the spray tower and the three-phase separator, the sedimentation tank and the booster pump.

[0012] In another embodiment, the three-phase separators are arranged in series in a plurality, a temperature and humidity sensor is provided between two adjacent three-phase separators, and the three-phase separator at the rear end can be selectively opened or closed according to the temperature and humidity sensed by the temperature and humidity sensor.

[0013] In another embodiment, the VOCs catalytic reactor is a plurality of non-combustion catalytic reactors arranged in series, a VOCs detector is provided between two adjacent VOCs catalytic reactors, and the VOCs catalytic reactor at the rear end can be selectively opened or closed according to the detection value of the VOCs detector.

[0014] Furthermore, a flow sensor for sensing water flow is provided in the water channel between the spray tower and the pressure-stabilizing pump.

[0015] Furthermore, a temperature sensor for sensing water temperature is provided in the water channel between the spray tower and the pressure-stabilizing pump, and an auxiliary heater is provided in the water channel between the condenser and the spray tower.

[0016] Furthermore, the sedimentation tank is provided with a sedimentation area and a clean water area, a mud retaining platform with a top inclined upward toward the clean water area is provided between the sedimentation area and the clean water area, the spray tower and the three-phase separator are connected to the sedimentation area, and the booster pump is connected to the clean water area.

[0017] Furthermore, the clean water area is provided with a water level sensor, and the sedimentation area is provided with a water replenishment port.

[0018] The control method of the low-carbon and high-efficiency purification system for benzoquinone-containing waste gas as described above includes a water volume control step of adjusting the water supply of the booster pump according to the sensed flow of the flow sensor, a water replenishment step of replenishing the water volume of the wastewater pool according to the feedback signal of the water level sensor in the clean water area, and an auxiliary heating step of starting the auxiliary heater to increase the water temperature according to the sensed temperature of the temperature sensor.

[0019] Compared with the prior art, the beneficial effects of this case are as follows:

[0020] Taking advantage of the property that benzoquinone is soluble in hot water, a spray tower is set up where the water and gas paths intersect and dissolve the waste gas. At the same time, a condenser is set up at the front end to allow heat exchange between the high-temperature waste gas and the cooling water. The superheated water formed by the heat exchange is used for atomization spraying, thereby effectively treating VOCs such as benzoquinone while also taking into account the reduction of carbon emissions. Furthermore, a sedimentation tank is set up on the waterway, and the clean water after precipitation is recycled into the waterway circulation, making it a closed-loop waterway that can provide stable superheated water. While saving water consumption, it can also further recover residual heat, forming a comprehensive treatment system that treats complex waste gas while taking into account low carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the schematic diagram of the low-carbon and high-efficiency purification system for benzoquinone-containing waste gas in this case.

[0022] Figure 2 This is the start-up and water volume control steps flow chart of the low-carbon and high-efficiency purification system in this case

[0023] Figure 3 This is the auxiliary heating step flow chart of the low-carbon and high-efficiency purification system in this case

[0024] Figure 4 This is the flow chart of the water replenishment steps of the low-carbon and high-efficiency purification system in this case DETAILED DESCRIPTION

[0025] This case is a low-carbon and high-efficiency purification system for waste gas containing benzoquinone, especially in the enameled wire production line, which will produce complex waste gas containing benzoquinone. Its main characteristics are high temperature above 300°C and containing a large amount of VOCs gas. Its main component is gas containing organic toxic substances such as benzene, and it is also mixed with particulate matter. The benzoquinone with a high content is easy to dissolve in hot water and precipitate. It can precipitate and settle into a solid at a temperature of about 115°C. This case mainly uses this characteristic to purify waste gas while taking into account low-carbon emissions. The following examples further explain the characteristics of the present invention and other related features in detail to facilitate the understanding of technical personnel in the same industry:

[0026] Please refer to Figure 1, the exhaust gas input port in the figure is the air inlet 100, and the outlet for the purified air is the air outlet 160. Along the air path from the air inlet 100 to the air outlet 160, a condenser 110, a blower 120, a spray tower 130, a three-phase separator 140, and a VOCs catalytic reactor 150 are sequentially arranged. In this way, after the high-temperature exhaust gas undergoes heat exchange in the condenser 110, it is blown into the bottom of the spray tower 130 through the blower 120, and is sprayed by the water mist sprayed from top to bottom to dissolve the benzoquinone and adsorb particulate matter and some other VOCs gases. The remaining exhaust gas is then sent to the three-phase separator 140 through the top of the spray tower 130 for water vapor separation and further cooling, and finally discharged into the atmosphere after the VOCs catalytic reactor 150 catalytically removes the residual VOCs gas.

[0027] The water circuit takes the water inlet 200 of the condenser 110 as the starting point for illustration. The cooling water enters the condenser 110 from the water inlet 200 and heat exchange is performed in the condenser 110. Here, the gas circuit and the water circuit can be designed to spiral around each other inside the condenser 110, or the water circuit forms a water tank shape inside the condenser 110, and the gas circuit is embedded in the water tank. The gas circuit in the water tank can be provided with heat exchange fins. The main purpose is to fully perform heat exchange. The cooling water absorbs heat to increase the temperature, while the high-temperature exhaust gas is condensed and cooled. Therefore, the exhaust gas outlet of the gas circuit in the condenser 110 is set at the lower end of the condenser 110, so that the condensed water can be taken away with the exhaust gas without other treatment.

[0028] The cooling water heated after heat exchange in the condenser 110 is transported to the spray tower 130 through the pressure-stabilizing pump 210, and the waste gas entering from the lower end is sprayed from top to bottom at the upper end of the spray tower 130. The waste water generated after spraying is recovered by the sedimentation tank 300, and the clean water generated after the waste water is precipitated in the sedimentation tank 300 is transported to the condenser 110 through the booster pump 220. At the same time, the waste gas sprayed in the spray tower 130 takes away a part of the water vapor and is separated from the water vapor in the three-phase separator 140 at the rear end, and the generated waste water is also recovered by the sedimentation tank 300. In this way, a closed-loop circulating water circuit is formed along the condenser 110, the pressure-stabilizing pump 210, the spray tower 130 and the three-phase separator 140, the sedimentation tank 300, and the booster pump 220.

[0029] Here, using a pressure-stabilizing pump 210 when delivering water for spraying is also one of the innovative points of the present invention, because the present invention delivers water after exchange in the condenser 110, so a pressure-stabilizing pump 210 is set between the condenser 110 and the spray tower 130, and combined with the booster pump 220 at the front end of the water inlet 200 of the condenser 110, a relatively stable pressure vessel is actually formed in the condenser 110, that is, when the cooling water after heat exchange in the condenser 110 is output to the spray tower 130, it is actually in a superheated water state, and forms mist-like high-temperature water vapor when sprayed out in the spray tower 130. The higher the temperature, the better the solubility of benzoquinone. For the convenience of explanation, in the present specification, the water delivered to the spray tower 130 is described as superheated water.

[0030] In this way, the superheated water formed by heat exchange is used for atomization spraying, thereby effectively treating VOCs such as benzoquinone while also taking into account the reduction of carbon emissions. Furthermore, a sedimentation tank 300 is set up on the waterway, and the clean water after precipitation is recycled into the waterway circulation, making it a closed-loop waterway that can provide stable superheated water, saving cooling water consumption, and further recovering residual heat, forming a comprehensive treatment system that treats complex exhaust gas while taking into account low carbon.

[0031] Specifically, the sedimentation tank 300 is provided with a sedimentation area 310 and a clean water area 320, and the sedimentation area 310 and the clean water area 320 are separated by a mud guard 330. The spray tower 130 and the three-phase separator 140 are connected to the sedimentation area 310 to discharge wastewater into the sedimentation area 310. At the same time, the top of the mud guard 330 is designed to be inclined toward the clean water area 320. After precipitation in the sedimentation area 310, the clean water at the upper end overflows the mud guard 330 and flows into the clean water tank 310. The oblique setting of the mud guard 330 can prevent the sediment from not being accumulated and flowing into the clean water tank 310 with the clean water. In another embodiment, the mud guard 330 can also be set in a step shape to further prevent the sediment from flowing into the clean water tank 310. The booster pump 220 is connected to the clean water area 320, and a water level sensor 340 is also provided in the clean water area 320.

[0032] Specifically, the water level sensor 340 includes a low water level sensor 341 and a high water level sensor 342, and a water replenishment port 350 for replenishing cooling water is provided in the sedimentation area 310. During implementation, when the low water level sensor 341 does not sense the water level, it means that the amount of water in the clear water area 320 is difficult to maintain the operation of the booster pump 220, and the system opens the water replenishment valve 351 of the water replenishment port 350 to replenish water. On the contrary, when the high water level sensor 342 senses the water level, it means that the amount of water in the system is sufficient, and the water replenishment valve 351 is closed to stop replenishing water. Because the main solute is benzoquinone, the higher the temperature, the better the solubility, on the contrary, the lower the temperature, the easier it is to precipitate, so the water replenishment port 350 is also provided in the sedimentation area 310 to further promote precipitation.

[0033] Furthermore, a flow sensor 211 for sensing water flow is provided on the water path between the spray tower 130 and the pressure-stabilizing pump 210. As mentioned above, the system should give priority to ensuring water pressure, and when the flow is reduced, the spray dissolution effect will also be affected. Therefore, the purpose of providing the flow sensor 211 is to increase the water supply of the booster pump 220 when it is sensed that the water flow is reduced.

[0034] When the amount of water fluctuates, the water temperature will actually fluctuate as well. In this regard, auxiliary heating measures have also been taken in this case. A temperature sensor 212 is also provided in the water path between the spray tower 130 and the pressure-stabilizing pump 210, preferably in a position close to the spray tower 130. At the same time, an auxiliary heater 213 is provided in the water path between the condenser 110 and the spray tower 130. When the temperature sensor 212 senses a low temperature, the auxiliary heater 213 is turned on for auxiliary heating to ensure the spray water temperature. When the sensed water temperature reaches a high temperature, the auxiliary heating can be stopped or low-power heating can be maintained. The auxiliary heater 213 can be an electric auxiliary heating method such as PTC ceramic heating.

[0035] One of the main inventions of this case is that its water system can be a closed-loop circulation system, which can achieve energy-saving and low-carbon effects on both water and electricity. The working method of the system is explained below. Figure 2 For reference, the flowchart of the steps of starting up and controlling the water volume of the high-efficiency purification system of the present invention includes the following steps.

[0036] Step S1: Open the water replenishment valve 351 to replenish water in the sedimentation tank 300;

[0037] Step S2: Check whether the high water level sensor 342 senses the water level. If yes, execute step S3; otherwise, repeat step S2;

[0038] Step S3: close the water supply valve 351 and execute step S4;

[0039] Step S4: start the boost pump 220, start the pressure-stabilizing pump 210, and execute step S5;

[0040] Step S5: Open the air intake valve 101, start the blower 120, and execute step S6;

[0041] Step S6: start the three-phase separator 140, start the VOCs catalytic reactor 150, and execute step S7;

[0042] Step S7 is a flow control step, including:

[0043] Step S71: The flow sensor 211 senses in real time whether the water volume L1 is less than the preset water volume L0. If so, step S72 is executed. If not, the operation continues.

[0044] Step S72: The booster pump 220 increases the water supply, and step S71 is repeated.

[0045] The real-time water volume L1 sensed in this process step is the real-time water volume sensed by the flow sensor 211 during system operation, and the preset water volume L0 is a preset value set to maintain stable system operation. After reaching this water volume, the subsequent system can circulate water stably. It should be noted that the water tank of the condenser 110 in this system is full of water by default. If it is used for the first time or after cleaning, the water tank of the condenser 110 also needs to be kept full of water.

[0046] In actual operation, the water temperature will be affected by the intake temperature of the high-temperature exhaust gas and the air temperature. If the temperature of the superheated water decreases, it will affect the dissolution of benzoquinone. Figure 3 For reference, the present invention also has an auxiliary heating step S8 for increasing the water temperature by starting the auxiliary heater 213 according to the sensed temperature of the temperature sensor 212. The auxiliary heating step S8 includes:

[0047] Step S81: the temperature sensor 212 detects whether the sensing temperature T1 is less than the first preset temperature T0. If so, step S82 is executed. Otherwise, step S81 is repeated.

[0048] Step S82: Turn on the auxiliary heater 213, and execute step S83;

[0049] Step S83: heating for a preset time t0, and comparing the sensed temperature T1 of the temperature sensor 212 with the preset temperature;

[0050] The preset temperature here refers to the first preset temperature T0 and the second preset temperature T2. Because the benzoquinone of the present invention dissolves in hot water, it is necessary to preset a water temperature at which the system can operate stably and fully dissolve the benzoquinone. This temperature is the first preset temperature T0. When the temperature does not reach this temperature, intervention is required, and the auxiliary heater 213 of the external device is used for heating. At this time, after the preset heating time t0, which is at least one cycle of water, the water temperature in the system can reach the standard temperature for turning off the auxiliary heater 213, which is the second preset temperature T2.

[0051] After the preset heating time t0 has passed, if T1>T2, step S831 is executed to turn off the auxiliary heater 213;

[0052] If T1<T0, it means that the heating is ineffective. Because the temperature is continuously low, the system cannot maintain efficient operation, and step S832 is executed to generate an abnormal alarm;

[0053] If T0≤T1<T2, it means that the heating is effective, but the water temperature is not high enough to allow stable circulation after the auxiliary heater 213 is turned off, so step S833 is executed, the auxiliary heater 213 runs at low power, and step S83 is repeated.

[0054] When the water circulates, some of the water will be vaporized and discharged out of the system along with the sediment. Figure 4 Therefore, it is necessary to replenish water in the waterway. As mentioned above, the present invention is provided with a water replenishment port 350 in the sedimentation tank 300, and a water replenishment step S9 is provided for replenishing the water volume of the wastewater tank 300 according to the feedback signal of the water level sensor 340. The water replenishment step S9 includes:

[0055] Step S91: whether the low water level sensor 341 senses the water level, if yes, then repeat step S91, otherwise, execute step S92;

[0056] Step S92: Open the water replenishment valve 351 to replenish water, and then execute step S93;

[0057] Step S93: Compare and judge the preset water replenishment time t1 and the sensing feedback of the water level sensor 340. Here, the preset water replenishment time t1 is the estimated time from the low water level sensor 341 to the high water level sensor 342. It will vary according to the amount of water replenishment, so it is necessary to compare and contrast with the water level sensor 340. If the high water level sensor 342 has water level sensing and the water replenishment time ≤ t1, it means that the water volume of the system can be stably and continuously operated, then execute step S931, stop water replenishment, and repeat step S91;

[0058] If the preset water replenishment time t1 has passed and there is no water level in the low water level sensor 341, it means that the system water volume is insufficient to operate, and water replenishment is invalid, and step S932 is executed to issue an abnormal alarm;

[0059] If the preset water replenishment time t1 has passed and the low water level sensor 341 has a water level and the high water level sensor 342 has no water level, it means that the water replenishment is effective, but the water loss is also relatively large. It is necessary to execute step S933, adjust the water replenishment valve 351 to replenish water with a low water volume, and repeat step S93.

[0060] Please continue to refer to Figure 1 The last two links of the gas circuit are the three-phase separator 140 and the VOCs catalytic reactor 150. In order to improve the purification effect of the gas discharged from the atmosphere, multiple of them can be set in series. However, if the exhaust gas pollution is relatively light and the front-end purification effect is ideal, multiple back-ends will cause resource waste. Therefore, an energy-saving adjustment plan is set.

[0061] As in the present embodiment, two three-phase separators 140 are arranged in series, and a temperature and humidity sensor 141 is arranged between the two three-phase separators 140, and the three-phase separator 140 at the rear end is opened or closed according to the sensed temperature and humidity. Similarly, the VOCs catalytic reactor 150 is also provided with a VOCs detector 151, and the VOCs catalytic reactor 150 at the rear end is opened or closed according to its detection value. In other embodiments, even if the number of three-phase separators 140 or VOCs catalytic reactors 150 exceeds two, this solution can continue to be used. Finally, the purified air discharged into the atmosphere will be tested for air quality by an independent detection device, so this is not designed and described in this case, and a terminal detection link can also be added to the invention of this case according to needs.

[0062] Specifically, the VOCs catalytic reactor 150 is a non-combustion catalytic reactor, which is also one of the technical points of the present invention. Because the purification of benzoquinone is completed in the front purification link, there is no need to use catalytic combustion that increases carbon emissions. Preferably, the VOCs catalytic reactor 150 adopts a non-combustion catalytic reactor with a metal catalyst. The metal catalyst usually uses precious metals such as platinum, palladium, and copper as catalysts, has high catalytic activity and stability, and is suitable for VOCs oxidation reactions under high temperature conditions. In addition, non-metallic catalysts and composite catalysts can also be applied to the present invention and can be replaced according to specific environmental requirements. Non-metallic catalysts usually use oxides, nitrides and other materials as catalysts, have good selectivity and durability, and are suitable for VOCs oxidation reactions under low temperature conditions. Composite catalysts refer to the combination of two or more catalysts to enhance the catalytic effect. For example, combining platinum with metals such as vanadium and tungsten can improve the stability and selectivity of the catalyst and reduce the cost of the catalyst.

[0063] As mentioned above, this case protects a low-carbon and high-efficiency purification system for benzoquinone-containing waste gas and its control method. All technical solutions that are the same or similar to this case should be deemed to fall within the scope of protection of this case.

Claims

1. A control method for a low-carbon and high-efficiency purification system for benzoquinone-containing waste gas, applied to a low-carbon and high-efficiency purification system, characterized in that: The low-carbon and high-efficiency purification system comprises: an air inlet (100) for inputting waste gas and an air outlet (160) for discharging purified air, and a water-cooled condenser (110), a blower (120), a spray tower (130), a three-phase separator (140), and a VOCs catalytic reactor (150) are sequentially arranged along the air path from the air inlet (100) to the air outlet (160); and further comprises a pressure-stabilizing pump (210) for conveying superheated water after heat exchange in the condenser (110) to the spray tower, a sedimentation tank (300) for recovering waste water in the spray tower (130) and the three-phase separator (140), and a booster pump (220) for conveying clean water generated after precipitation in the sedimentation tank (300) to the condenser (110); A closed-loop circulating water circuit is formed along the condenser (110), the pressure-stabilizing pump (210), the spray tower (130), the three-phase separator (140), the sedimentation tank (300), and the booster pump (220); a plurality of the three-phase separators (140) are arranged in series, a temperature and humidity sensor (141) is provided between two adjacent three-phase separators (140), and the three-phase separator (140) at the rear end can be selectively opened or closed according to the temperature and humidity sensed by the temperature and humidity sensor (141); The control method comprises: Step S1: Open the water replenishment valve (351) to replenish water; Step S2: Check whether the high water level sensor (342) senses the water level. If yes, proceed to step S3; otherwise, repeat step S2. Step S3: close the water supply valve (351) and execute step S4; Step S4: Start the boost pump (220), start the pressure stabilizing pump (210), and execute step S5; Step S5: Open the air inlet valve (101), start the blower (120), and execute step SS6; Step S6: start the three-phase separator (140), start the VOCs catalytic reactor (150), and execute step S7; Step S7 is a flow control step, including: Step S71: the flow sensor (211) senses in real time whether the water volume L1 is less than the preset water volume L0, if so, execute step SS72, if not, continue to run; Step S72: the booster pump (220) increases the water supply, and repeats step S71.

2. The control method of the low-carbon and high-efficiency purification system of benzoquinone-containing waste gas according to claim 1 is characterized in that The method further comprises an auxiliary heating step S8, which comprises: Step S81: the temperature sensor (212) senses whether the temperature T1 is less than the first preset temperature T0, if so, step S82 is executed, otherwise, step S81 is repeated; Step S82: Turn on the auxiliary heater (213), and execute step S83; Step S83: heating for a preset time t0, and comparing the sensed temperature T1 of the temperature sensor (212) with the preset temperature, if T1>T2, executing step S831, if T1<T0, executing step S832, if T0≤T1<T2, executing step S833; Step S831: turn off the auxiliary heater (213), and repeat step S81; Step S832: abnormal alarm; Step S833: The auxiliary heater (213) operates at low power, and step S83 is repeated.

3. The control method of the low-carbon and high-efficiency purification system of benzoquinone-containing waste gas according to claim 1, characterized in that The method further comprises a water replenishing step S9, which comprises: Step S91: whether the low water level sensor (341) senses the water level, if yes, repeat step S91, otherwise, execute step S92; Step S92: Open the water replenishment valve (351) to replenish water, and then execute step S93; Step S93: Compare and judge the preset water replenishment time t1 and the sensing feedback of the water level sensor (340); if the high water level sensor (342) senses the water level and the water replenishment time is ≤ t1, execute step S931; if the preset water replenishment time t1 has passed and the low water level sensor (341) has no water level, execute step S932; if the preset water replenishment time t1 has passed and the low water level sensor (341) has a water level and the high water level sensor (342) has no water level, execute step S933; Step S931: stop replenishing water, and repeat step S91; Step S932: abnormal alarm; Step S933: adjust the water replenishment valve (351) to replenish water at a low water volume, and repeat step S93.

4. A low-carbon and high-efficiency purification system for benzoquinone-containing waste gas, characterized in that The method according to any one of claims 1 to 3 is adopted, wherein the low-carbon and high-efficiency purification system comprises: an air inlet (100) for inputting waste gas and an air outlet (160) for discharging purified air, and a water-cooled condenser (110), a blower (120), a spray tower (130), a three-phase separator (140), and a VOCs catalytic reactor (150) are sequentially arranged along the air path from the air inlet (100) to the air outlet (160); and further comprises a pressure-stabilizing pump (210) for transporting superheated water after heat exchange in the condenser (110) to the spray tower, a sedimentation tank (300) for recovering waste water in the spray tower (130) and the three-phase separator (140), and transporting clean water produced after precipitation in the sedimentation tank (300) to the condenser (110). A booster pump (220) is provided; and a closed-loop circulating water circuit is formed along the condenser (110), the pressure-stabilizing pump (210), the spray tower (130), the three-phase separator (140), the sedimentation tank (300), and the booster pump (220).

5. The low-carbon and high-efficiency purification system for benzoquinone-containing waste gas according to claim 4, characterized in that A flow sensor (211) for sensing water flow is provided in the water channel between the spray tower (130) and the pressure-stabilizing pump (210).

6. The low-carbon and high-efficiency purification system for benzoquinone-containing waste gas according to claim 4, characterized in that The water channel between the spray tower (130) and the pressure-stabilizing pump (210) is provided with a temperature sensor (212) for sensing water temperature, and the water channel between the condenser (110) and the spray tower (130) is provided with an auxiliary heater (213).

7. The low-carbon and high-efficiency purification system for benzoquinone-containing waste gas according to claim 5, characterized in that The sedimentation tank (300) is provided with a sedimentation area (310) and a clean water area (320), a mud retaining platform (330) with a top inclined upward toward the clean water area is provided between the sedimentation area (310) and the clean water area (320), the spray tower (130) and the three-phase separator (140) are connected to the sedimentation area (310), and the booster pump (220) is connected to the clean water area (320).

8. The low-carbon and high-efficiency purification system for benzoquinone-containing waste gas according to claim 7, characterized in that The clean water area (320) is provided with a water level sensor (340), and the sedimentation area (310) is provided with a water replenishment port (350).

9. The low-carbon and high-efficiency purification system for benzoquinone-containing waste gas according to claim 7, characterized in that The VOCs catalytic reactor (150) is a plurality of non-combustion catalytic reactors arranged in series, a VOCs detector (151) is provided between two adjacent VOCs catalytic reactors (150), and the VOCs catalytic reactor (150) at the rear end can be selectively opened or closed according to the detection value of the VOCs detector (151).

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