Tail gas absorption tower
By integrating water washing and methanol washing units into the tail gas absorption tower, the problem of low tail gas treatment efficiency in methylamine production was solved, achieving efficient and environmentally friendly tail gas purification, and reducing cleaning frequency and floor space requirements.
Patent Information
- Application Number
- CN202520406948.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-10
AI Technical Summary
The exhaust gas produced during the production of methylamine contains unreacted volatile organic compounds such as methanol, ammonia, monomethylamine, dimethylamine, and trimethylamine. Direct emission of these compounds poses a threat to the environment and human health, and existing technologies are unable to effectively treat them.
Design an exhaust gas absorption tower that integrates water washing and methanol washing units, including dust removal, drying and adsorption packing layers, to achieve exhaust gas purification through multi-stage treatment, including dust removal, methanol and water washing, and optimize the treatment effect by utilizing a gas circulation and recovery system.
It improves the efficiency of exhaust gas treatment, reduces the footprint of the absorption tower, lowers the cleaning frequency, enhances the ability to treat dust, ensures full contact between gas molecules and solution, and improves the absorption efficiency of exhaust gas components.
Smart Images
Figure CN223861607U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to tail gas treatment technical field, concretely is a tail gas absorption tower. BACKGROUND
[0002] Methylamine is an important chemical raw material, which is widely used in pesticides, medicines, rubber, leather and other fields. However, a certain amount of tail gas will be produced in the production process of methylamine. If these tail gases are directly discharged without treatment, it will have a serious impact on the environment. The tail gas produced in the production process of methylamine mainly includes unreacted methanol, ammonia, monomethylamine, dimethylamine, trimethylamine and other volatile organic compounds (VOCs). These substances are not only harmful to the environment, but also pose a threat to human health. Therefore, the development of effective tail gas treatment device is of great importance to the realization of methylamine production environmental protection and sustainability. SUMMARY
[0003] The utility model aims at overcoming the prior art's insufficient, provide a kind of tail gas absorption tower, the tail gas generated in the production process of methylamine can be efficiently treated to reduce the influence of tail gas on environment.
[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows:
[0005] A kind of tail gas absorption tower, including absorption tower body, gas outlet and gas inlet respectively located at the upper and lower ends of absorption tower body, the inside of absorption tower body includes water washing unit, methanol washing unit and dust removal unit sequentially arranged from top to bottom, dust removal unit includes filter chamber, and dust removal bag separating filter chamber and methanol washing unit;Gas inlet is communicated with filter chamber.
[0006] Further, the dust removal unit further includes a gas pipe arranged above the dust removal bag, a plurality of air blowers opened on the gas pipe, a compressed air tank connected to one end of the gas pipe, and an electromagnetic valve arranged at the outlet of the compressed air tank;The lower end of the filter chamber is provided with a dust discharging port.
[0007] Further, the methanol washing unit includes a first tray arranged inside the absorption tower body, a methanol spraying pipe arranged above the first tray, a first gas passage penetrating the first tray, a first cap arranged at the top end of the first gas passage and opening downward, and a methanol overflow outlet and a methanol outlet opened on the absorption tower body;There is a gap between the first cap and the first gas passage, the methanol overflow outlet is lower than the top end of the first gas passage, and the methanol outlet is flush with the first tray.
[0008] Further, a methanol recovery unit connected to the methanol overflow outlet is further provided, and a methanol pump connected to the methanol recovery unit;The methanol pump is connected to the methanol spraying pipe.
[0009] Furthermore, the structure of the water washing unit is the same as that of the methanol washing unit, and the corresponding structural names are: second tray, water spray pipe, second gas passage, second cap, water overflow outlet and water outlet.
[0010] Furthermore, a water recycling unit connected to the water overflow outlet and a water pump connected to the water recycling unit are also provided; the water pump is connected to the water spray pipe.
[0011] Furthermore, a drying packing layer and an adsorption packing layer are also provided at the upper end of the absorption tower body.
[0012] Furthermore, a sampling port is provided at the gas outlet of the absorption tower body.
[0013] Furthermore, the exhaust gas absorption tower is also equipped with a gas circulation pipeline that connects the gas outlet to the dust removal unit, methanol washing unit, or water washing unit.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] (1) This utility model integrates alcohol washing and water washing into one absorption tower to achieve absorption and treatment of methanol, ammonia, monomethylamine, dimethylamine, trimethylamine and other substances generated during the production of methylamine. This can reduce the floor space of the absorption tower and improve the efficiency of the absorption tower in treating tail gas.
[0016] (2) Since exhaust gas usually contains some dust particles, if it is not treated, it will adhere to the inside of the absorption tower, and the inside of the absorption tower needs to be cleaned from time to time, which increases the workload. The dust removal mechanism of this utility model can block the dust particles in the exhaust gas, which can greatly reduce the number of times the absorption tower needs to be cleaned.
[0017] (3) In this utility model, the exhaust gas enters the methanol washing unit or water washing unit through the gas channel and overflows from the top of the gas channel. Under the action of the cap, the gas escapes from the methanol (or water), which can fully ensure the contact between the gas molecules and the methanol (or water). The gas overflowing from the water is then treated by spraying methanol (or water) for a second time, which can further absorb the components in the exhaust gas and effectively improve the efficiency of exhaust gas absorption. Attached Figure Description
[0018] Figure 1 The overall structural diagram of the exhaust gas absorption tower provided by this utility model.
[0019] The corresponding names of the attached figures are as follows: 1-Absorption tower body, 2-Inlet, 3-Outlet, 4-Filter chamber, 5-Dust collector bag, 6-Gas pipe, 7-Blowing port, 8-Compressed air manifold, 9-Solenoid valve, 10-Ash discharge port, 11-First tower plate, 12-First gas channel, 13-First cap, 14-Methanol spray pipe, 15-Methanol overflow port, 16-Methanol outlet, 17-Methanol recovery unit, 18-Methanol pump, 19-Second tower plate, 20-Water spray pipe, 21-Second gas channel, 22-Second cap, 23-Water overflow port, 24-Water outlet, 25-Water recovery unit, 26-Water pump, 27-Drying packing layer, 28-Adsorption packing layer, 29-Gas circulation pipe, 30-Sampling port. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.
[0021] Example 1
[0022] like Figure 1 As shown, this embodiment provides a tail gas absorption tower, including an absorption tower body 1. The upper end of the absorption tower body 1 is provided with an air outlet 3, and the lower end is provided with an air inlet 2. The interior of the absorption tower body 1, from top to bottom, consists of a water washing unit, a methanol washing unit, and a dust removal unit. The dust removal unit includes a filter chamber 4 and a dust collection bag 5. The dust collection bag 5 separates the filter chamber 4 from the methanol washing unit. The air inlet 2 is connected to the filter chamber 4. An air pipe 6 is installed above the dust collection bag 5. Multiple air blowing ports 7 are opened on the air pipe 6. Multiple dust collection bags 5 are also correspondingly provided, and each air blowing port 7 corresponds to one dust collection bag 5. One end of the air pipe 6 is connected to a compressed air manifold 8. The intake and exhaust of compressed air are controlled by a solenoid valve 9 installed at the outlet of the compressed air manifold 8. A dust discharge port 10 is provided at the lower end of the filter chamber 4. The exhaust gas enters the absorption tower through the inlet 2. The dust removal unit removes particulate matter from the exhaust gas, ensuring the cleanliness of the gas entering the absorption tower. This allows the absorption tower to remain clean even after long-term use. The dust removal unit is equipped with an air pipe 6, an air outlet 7, and a compressed air tank 8. Compressed air can be blown into the dust collection bag 5 through the action of the solenoid valve 9, thereby blowing off the dust particles on the surface of the dust collection bag 5. The dust particles can then be collected through the ash discharge port 10. In this embodiment, in order to keep the dust collection bag 5 in a hanging state, a support net is provided inside the dust collection bag 5 to ensure that the dust collection bag 5 does not deform after repeated use.
[0023] The methanol washing unit includes a first tray 11 disposed inside the absorption tower body 1. A first gas channel 12 is disposed through the first tray 11. A first cap 13 with its opening facing downward is disposed at the top of the first gas channel 12. There is a gap between the first cap 13 and the first gas channel 12. A methanol spray pipe 14 is also disposed, which is a distance higher than the first cap 13 and the first gas channel 12. The first cap 13 is connected to the top of the first gas channel 12 by a support frame. After being treated by the dust removal unit, the tail gas enters the methanol washing unit through the first gas channel 12. The methanol sprayed by the methanol spray pipe 14 is collected on the first tray 11, submerging part of the first cap 13. The tail gas escaping from the first gas channel 12 escapes from the methanol under the action of the first cap. After the tail gas has been initially washed by methanol, it is then subjected to a secondary cleaning by the methanol sprayed by the methanol spray pipe 14. This embodiment also includes a methanol overflow port 15 and a methanol outlet 16 on the absorption tower body 1. The methanol overflow port 15 is lower than the top of the first gas channel 12 to ensure that the methanol solution does not flow from the first gas channel 12 to the dust removal unit. The methanol outlet 16 is flush with the first tower plate 11, allowing residual methanol in the methanol washing unit to be discharged from the methanol outlet 16 after the tail gas treatment is completed. A methanol recovery unit 17 is connected to the methanol overflow port 15 to recover methanol from the outflowing solution. The recovered methanol is pumped to the methanol spray pipe 14 by a methanol pump 18, realizing the recycling of methanol. The waste liquid generated by the methanol recovery unit 17 enters the waste liquid treatment center. Alternatively, the methanol outlet 16 can also be connected to the methanol recovery unit 17.
[0024] The structure of the water washing unit is the same as that of the methanol washing unit, and the corresponding structural names are: second tray 19, water spray pipe 20, second gas passage 21, second cap 22, water overflow port 23, and water outlet 24. A water recovery unit 25 is connected to the water overflow port 23 to recover water from the outflowing solution. A water pump 26 is used to transport the recovered water and alcohol to the water spray pipe 20 to achieve water recycling. The waste liquid generated by the water recovery unit 25 also enters the waste liquid treatment center. The water outlet 24 can also be connected to the water recovery unit 25.
[0025] In this embodiment, a drying filling layer 27 and an adsorption filling layer 28 are also provided at the upper end of the absorption tower body 1 to absorb water vapor and other harmful components in the exhaust gas. The exhaust gas after being treated by the absorption tower can be discharged into the atmosphere.
[0026] Example 2
[0027] Based on Example 1, a sampling port 30 is provided at the outlet 3 of the absorption tower body 1 to sample the treated exhaust gas and test whether it meets the emission standards. Additionally, a gas circulation pipeline 29 is provided connecting the outlet 3 to the dust removal unit, methanol washing unit, or water washing unit. A valve is installed on the gas circulation pipeline 29. If the exhaust gas fails to meet the emission standards after testing, the valve can be opened to return the treated exhaust gas to the dust removal unit, methanol washing unit, or water washing unit until the exhaust gas meets the emission standards.
[0028] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.
Claims
1. A tail gas absorption tower, comprising an absorption tower body (1), an outlet (3) and an inlet (2) located at the upper and lower ends of the absorption tower body (1), characterized in that, The interior of the absorption tower body (1) includes a water washing unit, a methanol washing unit and a dust removal unit arranged sequentially from top to bottom. The dust removal unit includes a filter chamber (4) and a dust removal bag (5) that separates the filter chamber (4) from the methanol washing unit. The air inlet (2) is connected to the filter chamber (4).
2. The tail gas absorption tower according to claim 1, characterized in that, The dust removal unit also includes an air pipe (6) located above the dust bag (5), multiple air blowing ports (7) opened on the air pipe (6), a compressed air manifold (8) connected to one end of the air pipe (6), and a solenoid valve (9) located at the outlet of the compressed air manifold (8); the lower end of the filter chamber (4) is provided with a dust discharge port (10).
3. The tail gas absorption tower according to claim 2, characterized in that, The methanol washing unit includes a first tray (11) disposed inside the absorber body (1), a methanol spray pipe (14) disposed above the first tray (11), a first gas channel (12) disposed through the first tray (11), a first cap (13) disposed at the top of the first gas channel (12) with its opening facing downward, and a methanol overflow port (15) and a methanol outlet (16) opened on the absorber body (1); there is a gap between the first cap (13) and the first gas channel (12), the methanol overflow port (15) is lower than the top of the first gas channel (12), and the methanol outlet (16) is flush with the first tray (11).
4. The tail gas absorption tower according to claim 3, characterized in that, A methanol recovery unit (17) connected to a methanol overflow port (15) and a methanol pump (18) connected to the methanol recovery unit (17) are provided; the methanol pump (18) is connected to a methanol spray pipe (14).
5. A tail gas absorption tower according to claim 2 or 4, characterized in that, The structure of the water washing unit is the same as that of the methanol washing unit. The corresponding structural names are: second tray (19), water spray pipe (20), second gas passage (21), second cap (22), water overflow port (23) and water outlet (24).
6. A tail gas absorption tower according to claim 5, characterized in that, A water recycling unit (25) connected to a water overflow outlet (23) and a water pump (26) connected to the water recycling unit (25) are provided; the water pump (26) is connected to a water spray pipe (20).
7. A tail gas absorption tower according to claim 6, characterized in that, A drying packing layer (27) and an adsorption packing layer (28) are also provided at the upper end of the absorption tower body (1).
8. A tail gas absorption tower according to claim 7, characterized in that, A sampling port (30) is provided at the gas outlet (3) of the absorption tower body (1).
9. A tail gas absorption tower according to claim 8, characterized in that, A gas circulation pipe (29) is provided that connects the gas outlet (3) to the dust removal unit, methanol washing unit, or water washing unit.