High-concentration methanol waste gas treatment system

Abstract

The utility model relates to a high-concentration methanol waste gas treatment system which comprises a first-stage water washing tower and a second-stage water washing tower, a secondary water washing tower; a first-stage zeolite rotating wheel; a second-stage zeolite rotating wheel; a rectifying tower; the air outlet end of the first-stage water washing tower is connected with the air inlet end of the second-stage water washing tower, the air outlet end of the second-stage water washing tower is connected with the air inlet end of the first-stage zeolite rotating wheel, and the air outlet end of the first-stage zeolite rotating wheel is connected with the air inlet end of the second-stage zeolite rotating wheel; the water outlet end of the primary water washing tower is connected with the water inlet end of the rectifying tower, the water outlet end of the rectifying tower is connected with the water inlet end of the secondary water washing tower, and the water outlet end of the secondary water washing tower is connected with the water inlet end of the primary water washing tower. Compared with the prior art, the device is high in methanol adsorption efficiency, and adopts a two-stage washing tower absorption and two-stage zeolite runner adsorption process for treatment; the desorption waste gas of the first-stage zeolite rotating wheel is high in concentration and can be absorbed by the washing tower; the desorption waste gas concentration of the second-stage zeolite rotating wheel is relatively low, and the desorption waste gas can be adsorbed by the first-stage zeolite rotating wheel.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a high-concentration methanol waste gas treatment system. Background Art

[0002] In recent years, as the country's environmental protection requirements have become increasingly stringent, environmental emission standards have also become increasingly higher, and many production enterprises' waste gas is facing the need for upgrading. For the waste gas from a certain gluing workshop, the main component is methanol, and the methanol concentration is as high as 7% (volume fraction). Methanol is an organic matter that is easily soluble in water and has a low boiling point of 64.8°C. For these physical properties of methanol, the commonly used treatment methods are: water washing absorption method, activated carbon adsorption method, etc., but these methods are not suitable for treating high-concentration methanol waste gas. For the condensation treatment process, although some methanol can be condensed, the condensation temperature is extremely low, the operating cost is high, and the emission cannot meet the standard. If the combustion treatment process is adopted, the waste gas concentration needs to be diluted to below 25% LEL before combustion treatment can be carried out. The operating cost is high and the recovery value cannot be realized.

[0003] Patent CN201520572779.4 discloses a methanol waste gas recovery system. In view of the problems of high energy consumption and low recovery rate in the methanol waste gas recovery process, a high-efficiency, integrated recovery equipment integrating absorption and adsorption is developed, and it is proposed to directly use water as an absorbent to absorb methanol waste gas. The methanol waste gas recovery equipment effectively overcomes the adsorption heat of the adsorbent, prolongs the service life of the adsorbent, has good safety, and uses water to absorb methanol waste gas, with low energy consumption; in addition, through data processing and gas analysis workstation online analysis and automatic control equipment, the gas collection, absorption, adsorption and desorption operations are controlled. However, the adsorption efficiency is low and the recovered methanol concentration is low. Utility Model Content

[0004] The purpose of the utility model is to provide a high-concentration methanol waste gas treatment system in order to overcome the defects of the above-mentioned prior art. It has high efficiency in methanol adsorption and adopts a two-stage washing tower absorption + two-stage zeolite wheel adsorption process for treatment; the first-stage zeolite wheel desorbs waste gas with a high concentration, which can be absorbed by the washing tower. The second-stage zeolite wheel desorbs waste gas with a relatively low concentration, which can be adsorbed by the first-stage zeolite wheel; a distillation tower is used to treat a methanol and water mixed solution, and the recovered methanol has a high purity; the water separated by the distillation tower can be used to supplement water for the washing tower to achieve water recycling.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The utility model takes high-concentration methanol waste gas as a starting point to recover methanol in the waste gas, and the methanol recovery efficiency is greater than 95%, thus avoiding the waste of resources when the methanol waste gas is directly burned.

[0007] The utility model provides a high-concentration methanol waste gas treatment system, comprising: a primary water washing tower, a secondary water washing tower, a primary zeolite wheel, a secondary zeolite wheel, and a distillation tower;

[0008] The air inlet end of the primary water scrubber is connected to the input pipeline of the methanol waste gas, the air outlet end of the primary water scrubber is connected to the air inlet end of the secondary water scrubber, the air outlet end of the secondary water scrubber is connected to the air inlet end of the adsorption zone of the primary zeolite rotor, and the air outlet end of the adsorption zone of the primary zeolite rotor is connected to the air inlet end of the adsorption zone of the secondary zeolite rotor;

[0009] The water outlet of the primary water washing tower is connected to the water inlet of the distillation tower, the water outlet of the distillation tower is connected to the water inlet of the secondary water washing tower, and the water outlet of the secondary water washing tower is connected to the water inlet of the primary water washing tower.

[0010] Preferably, a dehumidification packing layer is provided in both the primary water washing tower and the secondary water washing tower.

[0011] Furthermore, the water outlet of the primary water washing tower is connected to the first heat exchanger, and the first heat exchanger is used to reduce the temperature of the circulating liquid at the bottom of the primary water washing tower.

[0012] Furthermore, a first water pump is provided between the water outlet of the primary water washing tower and the first heat exchanger.

[0013] Furthermore, the water outlet of the secondary water washing tower is connected to the second heat exchanger, and the second heat exchanger is used to reduce the temperature of the circulating liquid at the bottom of the secondary water washing tower.

[0014] Furthermore, a second water pump is provided between the water outlet of the secondary water washing tower and the second heat exchanger.

[0015] Further, the gas outlet of the adsorption zone of the secondary zeolite wheel is connected to the exhaust pipe, and the gas outlet of the cooling zone of the secondary zeolite wheel is connected to the heater. Preferably, a second fan is provided between the gas outlet of the adsorption zone of the secondary zeolite wheel and the exhaust pipe.

[0016] Furthermore, the heater is connected to the air inlet end of the desorption zone of the first-stage zeolite wheel and the air inlet end of the desorption zone of the second-stage zeolite wheel.

[0017] Further, the outlet of the desorption zone of the secondary zeolite wheel is connected to the inlet of the adsorption zone of the primary zeolite wheel. Preferably, a third fan is provided between the outlet of the desorption zone of the secondary zeolite wheel and the inlet of the adsorption zone of the primary zeolite wheel.

[0018] Further, the outlet of the desorption zone of the primary zeolite wheel is connected to the air inlet of the primary water washing tower. Preferably, a first fan is provided between the outlet of the desorption zone of the primary zeolite wheel and the air inlet of the primary water washing tower.

[0019] Furthermore, a methanol-containing wastewater storage tank is provided between the water outlet of the primary water washing tower and the water inlet of the distillation tower; a distilled water storage tank and a third heat exchanger are provided in sequence between the water outlet of the distillation tower and the water inlet of the secondary water washing tower; and the upper gas outlet of the distillation tower is connected to the methanol storage tank.

[0020] Here’s how it works:

[0021] The high-concentration methanol waste gas (volume fraction 7%) generated in the production workshop is collected through the air duct, and then the waste gas enters the primary water scrubber, which absorbs part of the methanol. The circulating liquid at the bottom of the primary water scrubber is cooled by the first heat exchanger, and the circulating water is used for heat exchange to improve the absorption efficiency. Then the waste gas enters the secondary water scrubber to further absorb methanol. The circulating liquid at the bottom of the secondary water scrubber is cooled by the second heat exchanger, and the chilled water is used for heat exchange. The waste gas enters the primary zeolite wheel for adsorption, and then enters the secondary zeolite wheel for adsorption. Finally, part of the purified waste gas is discharged through the exhaust pipe, and part of the purified gas is heated by the heater to 180°C and enters the primary zeolite wheel for desorption. The other part of the purified gas is heated by the heater to 190°C and goes to the secondary zeolite wheel for desorption.

[0022] The temperature of the gas desorbed by the secondary zeolite wheel is about 65°C. It enters the entrance of the primary zeolite wheel adsorption pipeline. After the gas is mixed, the temperature of the exhaust gas increases, the relative humidity of the exhaust gas increases, and the adsorption efficiency is improved. The temperature of the gas desorbed by the primary zeolite wheel is about 60°C. It enters the entrance of the primary water scrubber and mixes with the exhaust gas from the workshop. After mixing, it enters the primary water scrubber for absorption.

[0023] Pure water is added from the secondary water washing tower, the methanol-containing wastewater produced by the secondary water washing tower enters the primary water washing tower for recirculation and absorption, the methanol-containing wastewater discharged from the primary water washing tower enters the methanol-containing wastewater storage tank, the methanol-containing wastewater in the methanol-containing wastewater storage tank is rectified by the distillation tower, the methanol recovered by the distillation enters the methanol storage tank, the water obtained by the distillation enters the distilled water storage tank, and then enters the secondary water washing tower through the third heat exchanger to realize water circulation.

[0024] Compared with the prior art, the utility model has the following advantages:

[0025] (1) The methanol adsorption efficiency is high. Considering that the volume fraction of methanol in the exhaust gas is as high as 7%, a two-stage scrubber absorption + two-stage zeolite wheel adsorption process is used for treatment.

[0026] (2) The scrubbing tower can absorb methanol in the workshop exhaust gas and can also absorb the high-concentration methanol gas desorbed by the first-stage zeolite wheel. The scrubbing tower has a dual absorption function.

[0027] (3) A heat exchanger is set up for the circulating liquid at the bottom of the secondary scrubber, and chilled water is used for heat exchange to reduce the exhaust gas outlet temperature of the scrubber. The higher temperature gas desorbed by the secondary zeolite wheel is mixed with the gas at the outlet of the secondary scrubber to increase the gas temperature. By first cooling and then heating, the relative humidity of the gas can be reduced, and the adsorption efficiency of the primary zeolite wheel can be improved.

[0028] (4) The concentration of the waste gas desorbed by the primary zeolite wheel is relatively high and can be absorbed by the scrubber. The concentration of the waste gas desorbed by the secondary zeolite wheel is relatively low and can be adsorbed by the primary zeolite wheel.

[0029] (5) A distillation tower is used to treat a mixed solution of methanol and water, and the recovered methanol has high purity.

[0030] (6) The water separated by the distillation tower can be used to replenish water in the washing tower, thus realizing the recycling of water. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the high-concentration methanol waste gas treatment system.

[0032] Figure markings: 1-primary water washing tower; 2-secondary water washing tower; 3-primary zeolite rotor; 4-secondary zeolite rotor; 5-first heat exchanger; 6-second heat exchanger; 7-exhaust pipe; 8-first water pump; 9-first fan; 10-second fan; 11-third fan; 12-second water pump; 13-distillation tower; 14-methanol storage tank; 15-distilled water storage tank; 16-third heat exchanger; 17-methanol-containing wastewater storage tank. DETAILED DESCRIPTION

[0033] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0034] Example 1

[0035] This embodiment provides a high-concentration methanol waste gas treatment system. Figure 1 As shown, it includes: a primary water washing tower 1, a secondary water washing tower 2, a primary zeolite rotor 3, a secondary zeolite rotor 4, and a distillation tower 13;

[0036] The air inlet end of the primary water washing tower 1 is connected to the input pipeline of the methanol waste gas, the air outlet end of the primary water washing tower 1 is connected to the air inlet end of the secondary water washing tower 2, the air outlet end of the secondary water washing tower 2 is connected to the air inlet end of the adsorption zone of the primary zeolite rotor 3, and the air outlet end of the adsorption zone of the primary zeolite rotor 3 is connected to the air inlet end of the adsorption zone of the secondary zeolite rotor 4;

[0037] The water outlet of the primary water washing tower 1 is connected to the water inlet of the distillation tower 13 , the water outlet of the distillation tower 13 is connected to the water inlet of the secondary water washing tower 2 , and the water outlet of the secondary water washing tower 2 is connected to the water inlet of the primary water washing tower 1 .

[0038] In a specific embodiment, both the primary water washing tower 1 and the secondary water washing tower 2 are provided with a dehumidification packing layer.

[0039] In a specific embodiment, the water outlet end of the primary water washing tower 1 is connected to the first heat exchanger 5 , and the first heat exchanger 5 is used to reduce the temperature of the bottom circulating liquid of the primary water washing tower 1 .

[0040] In a specific implementation, a first water pump 8 is provided between the water outlet of the primary water washing tower 1 and the first heat exchanger 5 .

[0041] In a specific embodiment, the water outlet of the secondary water washing tower 2 is connected to the second heat exchanger 6 , and the second heat exchanger 6 is used to reduce the temperature of the circulating liquid at the bottom of the secondary water washing tower 2 .

[0042] In a specific implementation, a second water pump 12 is provided between the water outlet of the secondary water washing tower 2 and the second heat exchanger 6 .

[0043] In a specific embodiment, the adsorption zone outlet of the secondary zeolite wheel 4 is connected to the exhaust pipe 7, and the cooling zone outlet of the secondary zeolite wheel 4 is connected to the heater. A second fan 10 is provided between the adsorption zone outlet of the secondary zeolite wheel 4 and the exhaust pipe 7.

[0044] In a specific implementation manner, the heater is connected to the air inlet end of the desorption zone of the first zeolite wheel 3 and the air inlet end of the desorption zone of the second zeolite wheel 4 .

[0045] In a specific embodiment, the desorption zone outlet of the secondary zeolite rotor 4 is connected to the adsorption zone inlet of the primary zeolite rotor 3. Preferably, a third fan 11 is provided between the desorption zone outlet of the secondary zeolite rotor 4 and the adsorption zone inlet of the primary zeolite rotor 3.

[0046] In a specific embodiment, the outlet end of the desorption zone of the primary zeolite rotor 3 is connected to the inlet end of the primary water washing tower 1. Preferably, a first fan is provided between the outlet end of the desorption zone of the primary zeolite rotor 3 and the inlet end of the primary water washing tower 1.

[0047] In a specific embodiment, a methanol-containing wastewater storage tank 17 is provided between the water outlet of the primary water washing tower 1 and the water inlet of the distillation tower 13; a distilled water storage tank 15 and a third heat exchanger 16 are provided in sequence between the water outlet of the distillation tower 13 and the water inlet of the secondary water washing tower 2; and the upper gas outlet of the distillation tower 13 is connected to the methanol storage tank 14.

[0048] Here’s how it works:

[0049] The high-concentration methanol waste gas (volume fraction 7%) generated in the production workshop is collected through the air duct, and then the waste gas enters the primary water washing tower 1, the primary water washing tower 1 absorbs part of the methanol, the circulating liquid at the bottom of the primary water washing tower 1 is cooled by the first heat exchanger 5, and the circulating water is used for heat exchange to improve the absorption efficiency, and then the waste gas enters the secondary water washing tower 2 to further absorb methanol, and the circulating liquid at the bottom of the secondary water washing tower 2 is cooled by the second heat exchanger 6, and the chilled water is used for heat exchange. The waste gas enters the primary zeolite wheel 3 for adsorption, and then enters the secondary zeolite wheel 4 for adsorption. Finally, part of the purified waste gas is discharged through the exhaust pipe 7, part of the purified gas is heated by the heater to 180°C, and enters the primary zeolite wheel 3 for desorption, and the other part of the purified gas is heated by the heater to 190°C and goes to the secondary zeolite wheel 4 for desorption.

[0050] The temperature of the gas desorbed by the secondary zeolite wheel 4 is about 65°C, and it enters the inlet of the adsorption pipe of the primary zeolite wheel 3. After the gas is mixed, the temperature of the exhaust gas increases, the relative humidity of the exhaust gas is increased, and the adsorption efficiency is improved. The temperature of the gas desorbed by the primary zeolite wheel 3 is about 60°C, and it enters the inlet of the primary water washing tower 1, where it is mixed with the exhaust gas from the workshop, and then enters the primary water washing tower 1 for absorption.

[0051] Pure water is added from the secondary water washing tower 2, the methanol-containing wastewater produced by the secondary water washing tower 2 enters the primary water washing tower 1 for recirculation and absorption, the methanol-containing wastewater discharged from the primary water washing tower 1 enters the methanol-containing wastewater storage tank 17, the methanol-containing wastewater in the methanol-containing wastewater storage tank 17 is rectified by the distillation tower 13, the methanol recovered by the distillation enters the methanol storage tank 14, the water obtained by the distillation enters the distilled water storage tank 15, and then enters the secondary water washing tower 2 through the third heat exchanger 16 to realize water circulation.

[0052] A production workshop produces high-concentration methanol waste gas (volume fraction 7%) with a waste gas volume of 8000Nm 3 / hAfter being treated by two-stage scrubbers, the methanol exhaust gas concentration is reduced to 1200mg / m 3 After two-stage wheel adsorption treatment, the methanol exhaust gas concentration is reduced to 20 mg / m 3 The amount of methanol recovered is 0.76t / h, and the recovery rate is 95%.

[0053] Example 2

[0054] This embodiment provides a high-concentration methanol waste gas treatment system. Figure 1 As shown, it includes: a primary water washing tower 1, a secondary water washing tower 2, a primary zeolite rotor 3, a secondary zeolite rotor 4, and a distillation tower 13;

[0055] The air inlet end of the primary water washing tower 1 is connected to the input pipeline of the methanol waste gas, the air outlet end of the primary water washing tower 1 is connected to the air inlet end of the secondary water washing tower 2, the air outlet end of the secondary water washing tower 2 is connected to the air inlet end of the adsorption zone of the primary zeolite rotor 3, and the air outlet end of the adsorption zone of the primary zeolite rotor 3 is connected to the air inlet end of the adsorption zone of the secondary zeolite rotor 4;

[0056] The water outlet of the primary water washing tower 1 is connected to the water inlet of the distillation tower 13 , the water outlet of the distillation tower 13 is connected to the water inlet of the secondary water washing tower 2 , and the water outlet of the secondary water washing tower 2 is connected to the water inlet of the primary water washing tower 1 .

[0057] In a specific embodiment, both the primary water washing tower 1 and the secondary water washing tower 2 are provided with a dehumidification packing layer.

[0058] In a specific embodiment, the water outlet end of the primary water washing tower 1 is connected to the first heat exchanger 5 , and the first heat exchanger 5 is used to reduce the temperature of the bottom circulating liquid of the primary water washing tower 1 .

[0059] In a specific implementation, a first water pump 8 is provided between the water outlet of the primary water washing tower 1 and the first heat exchanger 5 .

[0060] In a specific embodiment, the water outlet of the secondary water washing tower 2 is connected to the second heat exchanger 6 , and the second heat exchanger 6 is used to reduce the temperature of the circulating liquid at the bottom of the secondary water washing tower 2 .

[0061] In a specific implementation, a second water pump 12 is provided between the water outlet of the secondary water washing tower 2 and the second heat exchanger 6 .

[0062] In a specific embodiment, the adsorption zone outlet of the secondary zeolite wheel 4 is connected to the exhaust pipe 7, and the cooling zone outlet of the secondary zeolite wheel 4 is connected to the heater. A second fan 10 is provided between the adsorption zone outlet of the secondary zeolite wheel 4 and the exhaust pipe 7.

[0063] In a specific implementation manner, the heater is connected to the air inlet end of the desorption zone of the first zeolite wheel 3 and the air inlet end of the desorption zone of the second zeolite wheel 4 .

[0064] In a specific embodiment, the desorption zone outlet of the secondary zeolite rotor 4 is connected to the adsorption zone inlet of the primary zeolite rotor 3. Preferably, a third fan 11 is provided between the desorption zone outlet of the secondary zeolite rotor 4 and the adsorption zone inlet of the primary zeolite rotor 3.

[0065] In a specific embodiment, the outlet end of the desorption zone of the primary zeolite rotor 3 is connected to the inlet end of the primary water washing tower 1. Preferably, a first fan 9 is provided between the outlet end of the desorption zone of the primary zeolite rotor 3 and the inlet end of the primary water washing tower 1.

[0066] In a specific embodiment, a methanol-containing wastewater storage tank 17 is provided between the water outlet of the primary water washing tower 1 and the water inlet of the distillation tower 13; a distilled water storage tank 15 and a third heat exchanger 16 are provided in sequence between the water outlet of the distillation tower 13 and the water inlet of the secondary water washing tower 2; and the upper gas outlet of the distillation tower 13 is connected to the methanol storage tank 14.

[0067] Here’s how it works:

[0068] The high-concentration methanol waste gas (volume fraction 7%) generated in the production workshop is collected through the air duct, and then the waste gas enters the primary water washing tower 1, the primary water washing tower 1 absorbs part of the methanol, the circulating liquid at the bottom of the primary water washing tower 1 is cooled by the first heat exchanger 5, and the circulating water is used for heat exchange to improve the absorption efficiency, and then the waste gas enters the secondary water washing tower 2 to further absorb methanol, and the circulating liquid at the bottom of the secondary water washing tower 2 is cooled by the second heat exchanger 6, and the chilled water is used for heat exchange. The waste gas enters the primary zeolite wheel 3 for adsorption, and then enters the secondary zeolite wheel 4 for adsorption. Finally, part of the purified waste gas is discharged through the exhaust pipe 7, part of the purified gas is heated by the heater to 180°C, and enters the primary zeolite wheel 3 for desorption, and the other part of the purified gas is heated by the heater to 190°C and goes to the secondary zeolite wheel 4 for desorption.

[0069] The temperature of the gas desorbed by the secondary zeolite wheel 4 is about 65°C, and it enters the inlet of the adsorption pipe of the primary zeolite wheel 3. After the gas is mixed, the temperature of the exhaust gas increases, the relative humidity of the exhaust gas is increased, and the adsorption efficiency is improved. The temperature of the gas desorbed by the primary zeolite wheel 3 is about 60°C, and it enters the inlet of the primary water washing tower 1, where it is mixed with the exhaust gas from the workshop, and then enters the primary water washing tower 1 for absorption.

[0070] Pure water is added from the secondary water washing tower 2, the methanol-containing wastewater produced by the secondary water washing tower 2 enters the primary water washing tower 1 for recirculation and absorption, the methanol-containing wastewater discharged from the primary water washing tower 1 enters the methanol-containing wastewater storage tank 17, the methanol-containing wastewater in the methanol-containing wastewater storage tank 17 is rectified by the distillation tower 13, the methanol recovered by the distillation enters the methanol storage tank 14, the water obtained by the distillation enters the distilled water storage tank 15, and then enters the secondary water washing tower 2 through the third heat exchanger 16 to realize water circulation.

[0071] A production workshop produces high-concentration methanol waste gas (volume fraction 5%) with a waste gas volume of 10000Nm 3 / hAfter being treated by two-stage scrubbers, the methanol exhaust gas concentration is reduced to 1070mg / m 3 After two-stage wheel adsorption treatment, the methanol exhaust gas concentration is reduced to 15mg / m 3 The amount of methanol recovered is 0.76t / h, and the recovery rate is 96%.

[0072] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0073] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A high concentration methanol waste gas treatment system, characterized in that: include: A primary water washing tower (1), a secondary water washing tower (2), a primary zeolite rotor (3), a secondary zeolite rotor (4), and a distillation tower (13); The air inlet end of the primary water scrubber (1) is connected to the input pipeline of the methanol waste gas, the air outlet end of the primary water scrubber (1) is connected to the air inlet end of the secondary water scrubber (2), the air outlet end of the secondary water scrubber (2) is connected to the air inlet end of the adsorption zone of the primary zeolite rotor (3), and the air outlet end of the adsorption zone of the primary zeolite rotor (3) is connected to the air inlet end of the adsorption zone of the secondary zeolite rotor (4); The water outlet end of the primary water washing tower (1) is connected to the water inlet end of the distillation tower (13), the water outlet end of the distillation tower (13) is connected to the water inlet end of the secondary water washing tower (2), and the water outlet end of the secondary water washing tower (2) is connected to the water inlet end of the primary water washing tower (1).

2. A high-concentration methanol waste gas treatment system according to claim 1, characterized in that: The water outlet end of the primary water washing tower (1) is connected to a first heat exchanger (5), and the first heat exchanger (5) is used to reduce the temperature of the circulating liquid at the bottom of the primary water washing tower (1).

3. A high-concentration methanol waste gas treatment system according to claim 2, characterized in that: A first water pump (8) is provided between the water outlet end of the primary water washing tower (1) and the first heat exchanger (5).

4. A high-concentration methanol waste gas treatment system according to claim 1, characterized in that: The water outlet end of the secondary water washing tower (2) is connected to a second heat exchanger (6), and the second heat exchanger (6) is used to reduce the temperature of the circulating liquid at the bottom of the secondary water washing tower (2).

5. A high-concentration methanol waste gas treatment system according to claim 4, characterized in that: A second water pump (12) is provided between the water outlet end of the secondary water washing tower (2) and the second heat exchanger (6).

6. A high-concentration methanol waste gas treatment system according to claim 1, characterized in that: The gas outlet end of the adsorption zone of the secondary zeolite wheel (4) is connected to the exhaust pipe (7), and the gas outlet end of the cooling zone of the secondary zeolite wheel (4) is connected to the heater.

7. A high-concentration methanol waste gas treatment system according to claim 6, characterized in that: The heater is connected to the air inlet end of the desorption zone of the first zeolite wheel (3) and the air inlet end of the desorption zone of the second zeolite wheel (4).

8. A high concentration methanol waste gas treatment system according to claim 1, characterized in that: The gas outlet end of the desorption zone of the secondary zeolite rotor (4) is connected to the gas inlet end of the adsorption zone of the primary zeolite rotor (3).

9. A high-concentration methanol waste gas treatment system according to claim 1, characterized in that: The gas outlet end of the desorption zone of the primary zeolite rotor (3) is connected to the gas inlet end of the primary water washing tower (1).

10. A high concentration methanol waste gas treatment system according to claim 1, characterized in that: A methanol-containing wastewater storage tank (17) is provided between the water outlet of the primary water washing tower (1) and the water inlet of the distillation tower (13); a distilled water storage tank (15) and a third heat exchanger (16) are provided in sequence between the water outlet of the distillation tower (13) and the water inlet of the secondary water washing tower (2); and the upper gas outlet of the distillation tower (13) is connected to the methanol storage tank (14).

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