Methylhydrazine waste gas adsorption device

Abstract

The utility model belongs to the technical field of methylhydrazine production, and particularly relates to a methylhydrazine waste gas adsorption device which comprises a washing mechanism, a silk screen filter, an adsorption mechanism and a condensation mechanism, the condensation mechanism is connected with the adsorption mechanism and the silk screen filter, the silk screen filter is connected with a heat exchange condenser, and the heat exchange condenser is connected with the adsorption mechanism. The heat exchange condenser is connected with a solvent storage tank, the solvent storage tank is connected with a silk screen filter, the silk screen filter is connected with a washing mechanism, the input end of the washing mechanism is connected with a waste gas exhaust device, and the output end of the silk screen filter is connected to the input end of an adsorption mechanism. And the output end of the adsorption mechanism is connected with a gas discharge device. According to the organic waste gas treatment device, organic waste gas generated by methyl hydrazine is effectively circularly treated and is discharged until NMHC (non-methane hydrocarbons) in the discharged gas is lower than the national discharge standard value, so that the treatment effect and efficiency of the organic waste gas are effectively improved, and meanwhile, the problem of environmental pollution is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of methylhydrazine production, and specifically relates to a methylhydrazine waste gas adsorption device. Background Art

[0002] During the production process of methylhydrazine, organic waste gas containing methanol vapor, methylhydrazine vapor, hydrazine hydrate vapor, etc. will be generated. Organic waste gas will cause great harm to the atmosphere and human health, and needs to be treated before it can be discharged. At present, the treatment technologies of organic waste gas include adsorption, combustion, chemical catalysis, biological removal, low-temperature plasma, membrane separation and other methods. These methods have some problems to varying degrees, such as: membrane separation is rarely used on a large scale in industrialization, biological removal takes a long time to process, low-temperature plasma has a large investment and has purification limitations, adsorption, combustion and chemical catalysis have problems such as low efficiency and high energy consumption, and it is difficult to meet national emission standards.

[0003] There are studies on the problems of organic waste gas treatment technology in the prior art, such as patent application CN112546841A - a method and equipment for treating acidic mixed organic waste gas from cobalt extraction, which adopts a process of secondary alkali washing + water washing + activated carbon adsorption + condensation recovery to make the waste gas emission value far lower than the national standard, solving the problems of the current organic waste gas treatment technology. However, the existing organic waste gas treatment method can only treat the acidic mixed organic waste gas generated during cobalt extraction, but it is difficult to effectively treat the organic waste gas containing methanol vapor, methylhydrazine vapor, hydrazine hydrate vapor, etc. generated in the production of methylhydrazine, making it difficult to meet the national emission standards. Therefore, a new technical solution is needed to solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a methylhydrazine waste gas adsorption device to solve the problem that the current organic waste gas treatment method proposed in the above background technology is difficult to effectively treat organic waste gas containing methanol vapor, methylhydrazine vapor, hydrazine hydrate vapor, etc. generated in the production of methylhydrazine, making it difficult to meet the national emission standards.

[0005] To achieve the above object, the present utility model provides the following technical solutions: A methylhydrazine waste gas adsorption device, comprising a water washing mechanism, a wire mesh filter, an adsorption mechanism, and a condensation mechanism. The input end of the condensation mechanism is connected to the waste gas output end of the adsorption mechanism, the output end of the condensation mechanism is connected to the circulating input end of the wire mesh filter, the waste liquid output end of the wire mesh filter is connected to a heat exchange condenser, the output end of the heat exchange condenser is connected to a solvent storage tank, the exhaust end of the solvent storage tank is connected to the input end A of the wire mesh filter, the input end B of the wire mesh filter is connected to the output end of the water washing mechanism, the input end of the water washing mechanism is connected to a waste gas discharging device, the output end of the wire mesh filter is connected to a fan A and is divided into two paths through the fan A: One path is connected to a gas discharging device; the other path is connected to the input end of the adsorption mechanism, and the output end of the adsorption mechanism is connected to a gas discharging device.

[0006] Further, the water washing mechanism includes a water washing tower A and a water washing tower B. The gas output end of the water washing tower A is connected to the gas input end of the water washing tower B, and the gas output end of the water washing tower B is connected to the input end B of the wire mesh filter; the input end A of the water washing tower A is connected to an alkali washing device, the output end B of the water washing tower A is connected to the waste gas discharging device, the water inlet end of the water washing tower A is connected to a tap water storage tank, both the side and the bottom of the water washing tower A are connected to a waste water pipe A and are communicated with a waste water pool through the waste water pipe A; the water inlet end of the water washing tower B is connected to the tap water storage tank, both the side and the bottom of the water washing tower B are connected to a waste water pipe B and are communicated with the waste water pool through the waste water pipe B.

[0007] Further, the adsorption mechanism includes a resin adsorption tank A and a resin adsorption tank B. The input end A of the resin adsorption tank A or the resin adsorption tank B is connected to the output end of the wire mesh filter through the fan A. When the resin adsorption tank A is in the working state, the resin adsorption tank B is in the standby state. When the resin adsorption tank A is in the standby state, the resin adsorption tank B is in the working state.

[0008] Further, the input B end of the resin adsorption tank A is connected to a blower B and is connected to an air discharge device through the blower B. The steam end of the resin adsorption tank A is connected to a steam generator. The gas output end of the resin adsorption tank A is connected to a gas discharge device. The waste liquid output end of the resin adsorption tank A is connected to the input end of a heat exchange condenser and is connected to the input end of a solvent storage tank through the heat exchange condenser. The waste gas output end of the resin adsorption tank A is connected to the input end of a condensation mechanism. The input B end of the resin adsorption tank B is connected to a blower B and is connected to an air discharge device through the blower B. The steam end of the resin adsorption tank B is connected to a steam generator. The gas output end of the resin adsorption tank B is connected to a gas discharge device. The waste liquid output end of the resin adsorption tank B is connected to the input end of a heat exchange condenser and is connected to the input end of a solvent storage tank through the heat exchange condenser. The waste gas output end of the resin adsorption tank B is connected to the input end of a condensation mechanism.

[0009] Further, the condensation mechanism includes a condenser A and a condenser B. The input end of the condenser A is connected to the waste gas output end of the resin adsorption tank A or the waste gas output end of the resin adsorption tank B. The output end of the condenser A is connected to the input end of the condenser B. The waste gas output end of the condenser B is connected to the circulating input end of a wire mesh filter. The waste liquid output end of the condenser B is connected to the input end of a heat exchange condenser and is connected to the input end of a solvent storage tank through the heat exchange condenser. The output end of the solvent storage tank is connected to a waste liquid collection tank.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. The present utility model adopts a treatment process of water washing, filtering, adsorption, condensation cycle and recovery, enabling the organic waste gas generated by methylhydrazine to be effectively recycled until the NMHC (non-methane hydrocarbons) in the discharged gas is lower than the national emission standard value for discharge. This effectively improves the treatment effect and efficiency of the organic waste gas, and also effectively avoids environmental pollution. By connecting the output end of the condensation mechanism to the circulating input end of the wire mesh filter, the gas generated after the cooling and separation of the gas-liquid mixture by the condensation mechanism can be recycled into the wire mesh filter for circulating treatment, making the use of the condensation mechanism safer. By connecting the exhaust end of the solvent storage tank to the input A end of the wire mesh filter, the gas generated after the heat exchange of the waste liquid can be recovered into the wire mesh filter for treatment, making the recovery of the waste liquid safer and ensuring the effectiveness, reliability and safety of the treatment of methylhydrazine organic waste gas;

[0012] 2. The utility model is provided with waste water pipes connected to both the side and bottom of the water washing tower, enabling the waste water generated during the water washing process of the organic waste gas to be discharged in a timely manner, thereby ensuring the treatment effect of the water washing tower. By connecting a tap water storage tank to the water inlet end of the water washing tower, the water washing of the organic waste gas becomes more convenient and fast, ensuring the efficiency of the water washing treatment of the organic waste gas;

[0013] 3. Through the setting that the output end of the wire mesh filter is divided into two paths, the waste gas adsorption device can urgently discharge gas when in a fault state, enabling the waste gas adsorption device to promptly eliminate the fault and ensuring the safety of the use of the waste gas adsorption device;

[0014] 4. The utility model uses resin as the adsorbent, effectively improving the adsorption effect of the organic waste gas. Through the standby function of resin adsorption tank A and resin adsorption tank B, the waste gas adsorption device can always be in a working state, ensuring the treatment efficiency of methyl hydrazine organic waste gas. By adopting a two-stage condenser treatment method, the gas-liquid mixture generated in resin adsorption tank A or resin adsorption tank B can be fully separated under the action of cooling, enabling the separated gas to enter the wire mesh filter for cyclic treatment, and the waste liquid can also be recycled, ensuring the treatment effect and efficiency of the organic waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall structural schematic diagram of the utility model;

[0016] Figure 2 is the structural schematic diagram of the utility model in the state of urgently discharging gas;

[0017] Figure 3 is the structural schematic diagram of the utility model in the working state of resin adsorption tank A;

[0018] Figure 4 is the structural schematic diagram of the utility model in the working state of resin adsorption tank B.

[0019] Wherein: 1. Water washing mechanism; 101. Water washing tower A; 102. Water washing tower B; 2. Wire mesh filter; 3. Adsorption mechanism; 301. Resin adsorption tank A; 302. Resin adsorption tank B; 4. Condensation mechanism; 401. Condenser A; 402. Condenser B; 5. Heat exchange condenser; 6. Solvent storage tank; 7. Waste gas discharge device; 8. Fan A; 9. Gas discharge device; 10. Alkali washing device; 11. Tap water storage tank; 12. Waste water pipe A; 13. Waste water tank; 14. Waste water pipe B; 15. Fan B; 16. Air discharge device; 17. Steam generator; 18. Waste liquid collection tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following embodiments are used to further illustrate the content of the present utility model and do not limit the application of the present utility model.

[0021] Please refer to Figures 1-4 , the present utility model provides a methylhydrazine waste gas adsorption device, which includes a water washing mechanism 1 for washing organic waste gas with water, a wire mesh filter 2 for filtering the dust of the organic waste gas after water washing, an adsorption mechanism 3 for adsorbing harmful substances in the organic waste gas, and a condensation mechanism 4 for gas-liquid separation. The input end of the condensation mechanism 4 is connected to the waste gas output end of the adsorption mechanism 3, the output end of the condensation mechanism 4 is connected to the circulating input end of the wire mesh filter 2, the waste liquid output end of the wire mesh filter 2 is connected with a heat exchange condenser 5 for waste liquid heat exchange, the output end of the heat exchange condenser 5 is connected with a solvent storage tank 6 for storing waste liquid, the exhaust end of the solvent storage tank 6 is connected to the input A end of the wire mesh filter 2, the input B end of the wire mesh filter 2 is connected to the output end of the water washing mechanism 1, the input end of the water washing mechanism 1 is connected with a waste gas discharging device 7, the output end of the wire mesh filter 2 is connected with a fan A 8 for providing power and is divided into two paths through the fan A 8: one path is connected with a gas discharging device 9 for discharging gas; the other path is connected to the input end of the adsorption mechanism 3, the output end of the adsorption mechanism 3 is connected with the gas discharging device 9;

[0022] The water washing mechanism 1 includes a water washing tower A 101 and a water washing tower B 102. The input A end of the water washing tower A 101 is connected with an alkali washing device 10 for alkali washing with sodium hydroxide. The output B end of the water washing tower A 101 is connected with the waste gas discharging device 7. The water inlet end of the water washing tower A 101 is connected with a tap water storage tank 11 for conveying spray water. The side and bottom of the water washing tower A 101 are both connected with a waste water pipe A 12 and are communicated with a waste water tank 13 for storing waste water through the waste water pipe A 12. The gas output end of the water washing tower A 101 is connected to the gas input end of the water washing tower B 102. The water inlet end of the water washing tower B 102 is connected with the tap water storage tank 11. The side and bottom of the water washing tower B 102 are both connected with a waste water pipe B 14 and are communicated with the waste water tank 13 through the waste water pipe B 14. The gas output end of the water washing tower B 102 is connected to the input B end of the wire mesh filter 2;

[0023] The adsorption mechanism 3 includes a resin adsorption tank A 301 and a resin adsorption tank B 302. When the resin adsorption tank A 301 is in the working state, the resin adsorption tank B 302 is in the standby state. When the resin adsorption tank A 301 is in the standby state, the resin adsorption tank B 302 is in the working state;

[0024] The input A end of the resin adsorption tank A301 is connected to the output end of the wire mesh filter 2 through the fan A8. The input B end of the resin adsorption tank A301 is connected to the fan B15 for providing power and is connected to the air discharge device 16 for providing positive pressure through the fan B15. The steam end of the resin adsorption tank A301 is connected to the steam generator 17 for providing steam. The gas output end of the resin adsorption tank A301 is connected to the gas discharge device 9. The waste liquid output end of the resin adsorption tank A301 is connected to the input end of the heat exchange condenser 5 and is connected to the input end of the solvent storage tank 6 through the heat exchange condenser 5. The waste gas output end of the resin adsorption tank A301 is connected to the input end of the condensation mechanism 4;

[0025] The input A end of the resin adsorption tank B302 is connected to the output end of the wire mesh filter 2 through the fan A8. The input B end of the resin adsorption tank B302 is connected to the fan B15 and is connected to the air discharge device 16 through the fan B15. The steam end of the resin adsorption tank B302 is connected to the steam generator 17. The gas output end of the resin adsorption tank B302 is connected to the gas discharge device 9. The waste liquid output end of the resin adsorption tank B302 is connected to the input end of the heat exchange condenser 5 and is connected to the input end of the solvent storage tank 6 through the heat exchange condenser 5. The waste gas output end of the resin adsorption tank B302 is connected to the input end of the condensation mechanism 4;

[0026] The condensation mechanism 4 includes a condenser A401 and a condenser B402. The input end of the condenser A401 is connected to the waste gas output end of the resin adsorption tank A301 or the waste gas output end of the resin adsorption tank B302. The output end of the condenser A401 is connected to the input end of the condenser B402. The waste gas output end of the condenser B402 is connected to the circulation input end of the wire mesh filter 2. The waste liquid output end of the condenser B402 is connected to the input end of the heat exchange condenser 5 and is connected to the input end of the solvent storage tank 6 through the heat exchange condenser 5. The output end of the solvent storage tank 6 is connected to the waste liquid collection tank 18 for collecting waste liquid.

[0027] The working principle and usage process of the present utility model: As Figures 1-4 shown in the schematic diagram, after the methylhydrazine waste gas adsorption device is assembled, the operator installs the entire methylhydrazine waste gas adsorption device on the methylhydrazine production line, so that the organic waste gas generated by methylhydrazine can be effectively recycled until the NMHC (non-methane hydrocarbons) in the discharged gas is lower than the national emission standard value for discharge, effectively improving the treatment effect and efficiency of the organic waste gas, and at the same time solving the problem of environmental pollution;

[0028] When organic waste gas is generated during the production of methyl hydrazine, the operator discharges the organic waste gas (the concentration of NMHC in the organic waste gas is 15788 ppmC) into the water scrubber A101 through the waste gas discharge device 7. At the same time, the tap water in the tap water storage tank 11 will be discharged into the water scrubber A101 through the spray heads in the water scrubber A101, and the sodium hydroxide in the alkali washing device 10 will also be discharged into the water scrubber A101 to conduct alkali washing and water washing on the organic waste gas to remove the acidic substances in the organic waste gas (the washed organic waste gas will be contaminated with the excess sodium hydroxide solution). Then, the wastewater generated after washing will be discharged into the wastewater tank 13 through the wastewater pipe A12, and the washed organic waste gas will be discharged into the water scrubber B102 to continue the water washing process to remove the soluble gases in the washed organic waste gas. The wastewater generated after washing will be discharged into the wastewater tank 13 through the wastewater pipe B14, and the organic waste gas after removing the soluble gases will be discharged into the wire mesh filter 2 through the output end of the water scrubber B102 for filtration to remove the impurities in the organic waste gas. At the same time, the cooling gas discharged by the condenser B402 is used for cooling treatment. After cooling, a little waste liquid will be generated in the wire mesh filter 2, and the waste liquid will be discharged into the heat exchange condenser 5 through the waste liquid output end of the wire mesh filter 2 for heat exchange treatment and then discharged into the solvent storage tank 6, and then discharged into the waste liquid collection tank 18 through the solvent storage tank 6. When gas is generated in the solvent storage tank 6 during the discharge of the waste liquid after heat exchange, the gas will be transported to the wire mesh filter 2 again through the exhaust end of the solvent storage tank 6 for filtration treatment. When the resin adsorption tank B302 is in standby state, the organic waste gas after removing impurities will be pumped into the resin adsorption tank A301 by the fan A8 for adsorption treatment. During the adsorption process, the steam of the steam generator 17 will be discharged into the resin adsorption tank A301 to provide steam pressure. At the same time, air is discharged into the resin adsorption tank A301 through the fan B15 to provide positive pressure and displace the air in the resin adsorption tank A301. At the same time, the gas after adsorption treatment will also be discharged into the gas discharge device 9 through the gas output end of the resin adsorption tank A301 (the concentration of NMHC in the gas discharged into the gas discharge device 9 is reduced to 3689 ppmC). The generated waste liquid will be discharged into the heat exchange condenser 5 through the waste liquid output end of the resin adsorption tank A301 for heat exchange treatment and then discharged into the solvent storage tank 6, and then discharged into the waste liquid collection tank 18 through the solvent storage tank 6. The generated gas-liquid mixture will be discharged into the condenser A401 through the exhaust gas output end of the resin adsorption tank A301 for the first-stage condensation treatment, and then discharged into the condenser B402 through the output end of the condenser A401 for the second-stage condensation treatment. The gas after the second-stage condensation treatment will be discharged into the wire mesh filter 2 through the exhaust gas output end of the condenser B402 and the circulation input end of the wire mesh filter 2 for circulation treatment, and the liquid after the second-stage condensation treatment will be discharged into the heat exchange condenser 5 through the waste liquid output end of the condenser B402 for heat exchange treatment and then discharged into the solvent storage tank 6, and then discharged into the waste liquid collection tank 18 through the solvent storage tank 6 (the structural diagram of this treatment process,For example, Figure 3 as shown); when the resin adsorption tank A301 is in standby state, the organic waste gas with impurities removed will be sent into the resin adsorption tank B302 by the fan A8 for adsorption treatment. During the adsorption process, the steam from the steam generator 17 will be discharged into the resin adsorption tank B302 to provide steam pressure. At the same time, air will be discharged into the device 16 by the fan B15 and then into the resin adsorption tank B302 to provide positive pressure and displace the air in the resin adsorption tank B302. The gas after adsorption treatment will be discharged into the gas emission device 9 through the gas output end of the resin adsorption tank B302 (the concentration of NMHC in the gas discharged into the gas emission device 9 is reduced to 3689 ppmC). The generated waste liquid will be discharged into the heat exchange condenser 5 through the waste liquid output end of the resin adsorption tank B302 for heat exchange treatment and then into the solvent storage tank 6, and then into the waste liquid collection tank 18 through the solvent storage tank 6. The generated gas-liquid mixture will be discharged into the condenser A401 through the waste gas output end of the resin adsorption tank B302 for the first-stage condensation treatment, and then into the condenser B402 through the output end of the condenser A401 for the second-stage condensation treatment. The gas after the second-stage condensation treatment will be discharged into the wire mesh filter 2 through the waste gas output end of the condenser B402 and the circulation input end of the wire mesh filter 2 for circulation treatment. The liquid after the second-stage condensation treatment will be discharged into the heat exchange condenser 5 through the waste liquid output end of the condenser B402 for heat exchange treatment and then into the solvent storage tank 6, and then into the waste liquid collection tank 18 through the solvent storage tank 6 (the structural diagram of this treatment process is as Figure 4 shown); when the methylhydrazine waste gas adsorption device fails, the organic waste gas with impurities removed will be urgently sent into the gas emission device 9 by the fan A8, and then the methylhydrazine waste gas adsorption device will be repaired.

Claims

1. A methylhydrazine waste gas adsorption device, comprising a water washing mechanism, a wire mesh filter, an adsorption mechanism, and a condensation mechanism, wherein the input end of the condensation mechanism is connected to the waste gas output end of the adsorption mechanism, characterized in that: The output end of the condensation mechanism is connected to the circulation input end of the wire mesh filter, the waste liquid output end of the wire mesh filter is connected to a heat exchange condenser, the output end of the heat exchange condenser is connected to a solvent storage tank, the exhaust end of the solvent storage tank is connected to the input A end of the wire mesh filter, the input B end of the wire mesh filter is connected to the output end of the water washing mechanism, the input end of the water washing mechanism is connected to a waste gas discharge device, the output end of the wire mesh filter is connected to the input end of the adsorption mechanism, and the output end of the adsorption mechanism is connected to a gas discharge device.

2. A methylhydrazine waste gas adsorption device according to claim 1, characterized in that: The water washing mechanism comprises a water washing tower A and a water washing tower B, wherein the gas output end of the water washing tower A is connected to the gas input end of the water washing tower B, and the gas output end of the water washing tower B is connected to the input B end of the wire mesh filter.

3. A methylhydrazine waste gas adsorption device according to claim 2, characterized in that: The input A end of the water scrubber A is connected to an alkali washing device, the output B end of the water scrubber A is connected to a waste gas discharge device, the water inlet end of the water scrubber A is connected to a tap water storage tank, and the side and bottom of the water scrubber A are connected to a wastewater pipe A and are connected to a wastewater tank through the wastewater pipe A.

4. A methylhydrazine waste gas adsorption device according to claim 3, characterized in that: The water inlet end of the water washing tower B is connected to the tap water storage tank, and the side and bottom of the water washing tower B are connected to the wastewater pipe B and are connected to the wastewater pool through the wastewater pipe B.

5. The methylhydrazine waste gas adsorption device according to claim 1, characterized in that: The output end of the wire mesh filter is connected to a fan A and is divided into two paths through the fan A: one path is connected to the gas exhaust device; the other path is connected to the input end of the adsorption mechanism.

6. A methylhydrazine waste gas adsorption device according to claim 5, characterized in that: The adsorption mechanism comprises a resin adsorption tank A and a resin adsorption tank B. The input A end of the resin adsorption tank A or the resin adsorption tank B is connected to the output end of the wire mesh filter through a fan A.

7. A methylhydrazine waste gas adsorption device according to claim 6, characterized in that: The input B end of the resin adsorption tank A is connected to a fan B and is connected to an air exhaust device through the fan B. The steam end of the resin adsorption tank A is connected to a steam generator. The gas output end of the resin adsorption tank A is connected to the gas exhaust device. The waste liquid output end of the resin adsorption tank A is connected to the input end of the heat exchange condenser and is connected to the input end of the solvent storage tank through the heat exchange condenser. The waste gas output end of the resin adsorption tank A is connected to the input end of the condensation mechanism.

8. A methylhydrazine waste gas adsorption device according to claim 6, characterized in that: The input B end of the resin adsorption tank B is connected to a fan B and is connected to an air exhaust device through the fan B. The steam end of the resin adsorption tank B is connected to a steam generator. The gas output end of the resin adsorption tank B is connected to the gas exhaust device. The waste liquid output end of the resin adsorption tank B is connected to the input end of the heat exchange condenser and is connected to the input end of the solvent storage tank through the heat exchange condenser. The waste gas output end of the resin adsorption tank B is connected to the input end of the condensation mechanism.

9. A methylhydrazine waste gas adsorption device according to claim 7 or 8, characterized in that: The condensation mechanism includes a condenser A and a condenser B, wherein the output end of the condenser A is connected to the input end of the condenser B, the waste gas output end of the condenser B is connected to the circulation input end of the wire mesh filter, the waste liquid output end of the condenser B is connected to the input end of the heat exchange condenser and is connected to the input end of the solvent storage tank through the heat exchange condenser, and the output end of the solvent storage tank is connected to a waste liquid collection tank.

10. A methylhydrazine waste gas adsorption device according to claim 9, characterized in that: The input end of the condenser A is connected to the exhaust gas output end of the resin adsorption tank A or the exhaust gas output end of the resin adsorption tank B.

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