Efficient methanol storage tank waste gas purification and recovery system

Abstract

The utility model provides an efficient methanol storage tank waste gas purification and recovery system. The efficient methanol storage tank waste gas purification and recovery system comprises a centrifugal fan, a first-stage water washing tower, a second-stage water washing tower and a third-stage water washing tower, one end of the centrifugal fan is communicated with the waste gas output end of the efficient methanol storage tank, and the other end is communicated with the gas input end of the primary water scrubber; the gas output end of the first-stage water scrubber is communicated with the gas input end of the second-stage water scrubber, the liquid output end of the first-stage water scrubber is communicated with the first methanol aqueous solution collecting module, and the input end of the first-stage water scrubber spraying device is communicated with the liquid output end of the second-stage water scrubber; the gas output end of the second-stage water scrubber is communicated with the gas input end of the third-stage water scrubber, and the input end of the second-stage water scrubber spraying device is communicated with the liquid output end of the third-stage water scrubber. According to the efficient methanol storage tank waste gas purification and recovery system, methanol and effective components can be recycled, pollutant emission is reduced, and efficient treatment, energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] The present application relates to the field of efficient methanol storage tank waste gas recovery, and in particular to a high-efficiency methanol storage tank waste gas purification and recovery system. Background Art

[0002] In order to ensure that enterprises improve quality and efficiency, vigorously promote the goal of green development, ease resource and environmental constraints, promote further optimization of the economic structure, industrial transformation and upgrading, adhere to saving resources and protecting the environment, adhere to sustainable development, and accelerate the realization of the goal of building a resource-based and environmentally friendly society, it is necessary to control volatile organic compound waste gas in the coal chemical industry.

[0003] During the production and operation of coal-to-methanol technology, intermediate materials or final products such as crude methanol, refined methanol, sulfur-containing methanol and fusel oil will be produced and stored in corresponding storage tanks. During the operation of the storage tank, in order to stabilize the pressure in the tank, waste gas containing volatile organic compounds such as nitrogen, a small amount of methanol, nitrogen, carbon monoxide, hydrogen sulfide, and carbon dioxide will be produced, which will be directly discharged into the atmosphere through the storage tank breathing valve.

[0004] In the prior art, it is impossible to achieve standard emission for waste gases with different components through a single treatment method. Different treatment methods need to be adopted according to different gases, which results in low treatment efficiency, high resource consumption and low resource utilization. Utility Model Content

[0005] In response to the above problems, the present application provides a high-efficiency methanol storage tank waste gas purification and recovery system, which can realize centralized treatment of volatile waste gas from methanol storage tanks, and recover and reuse the methanol and effective components in the waste gas, reduce pollutant emissions, and achieve efficient treatment and energy saving and consumption reduction.

[0006] To achieve the purpose of this application, this application provides the following technical solutions:

[0007] The present application provides a high-efficiency methanol storage tank waste gas purification and recovery system, including: a centrifugal fan, a primary water washing tower, a secondary water washing tower, and a tertiary water washing tower;

[0008] One end of the centrifugal fan is connected to the exhaust gas output end of the high-efficiency methanol storage tank, and the other end is connected to the gas input end of the primary water scrubber;

[0009] The gas output end of the primary water scrubber is connected to the gas input end of the secondary water scrubber, the liquid output end of the primary water scrubber is connected to the first methanol aqueous solution collection module, and the input end of the primary water scrubber spray device is connected to the liquid output end of the secondary water scrubber;

[0010] The gas output end of the secondary water scrubber is connected to the gas input end of the tertiary water scrubber, and the input end of the spray device of the secondary water scrubber is connected to the liquid output end of the tertiary water scrubber;

[0011] The gas output end of the three-stage water scrubber is communicated with the gas collection module, and the input end of the spray device of the three-stage water scrubber is communicated with the desalted water output module.

[0012] In a possible implementation, the high-efficiency methanol storage tank waste gas purification and recovery system also includes: a gas-water separator; the input end of the gas-water separator is connected to the gas output end of the three-stage water washing tower, which is used to separate the gas into gas and liquid, and the gas output end of the gas-water separator is connected to the gas collection module; the liquid output end of the gas-water separator is connected to the second methanol-water solution collection module.

[0013] In a possible implementation, the high-efficiency methanol storage tank waste gas purification and recovery system also includes: a compressor; the input end of the compressor is connected to the gas output end of the three-stage water washing tower, for compressing the gas, the cooling water input end of the compressor is connected to the cooling return water output module, the cooling water output end of the compressor is connected to the cooling return water collection module, and the output end of the compressor is connected to the gas collection module.

[0014] In a possible implementation, the high-efficiency methanol storage tank waste gas purification and recovery system further includes: a refrigeration separation system, including: a cooler, an outlet liquid separation tank;

[0015] The input end of the cooler is connected to the gas output end of the three-stage water scrubber for cooling the gas; the cooling water input end of the cooler is connected to the cooling return water output module, and the cooling water output end of the cooler is connected to the cooling return water collection module;

[0016] The gas output end of the outlet liquid separator is communicated with the compressed gas collection module, and the liquid output end of the outlet liquid separator is communicated with the second methanol-water solution collection module.

[0017] In a possible implementation, a first delivery pump is provided on the connecting pipe between the liquid output end of the primary water washing tower and the first methanol-water solution collecting module.

[0018] In a possible implementation, a second delivery pump is provided on the connecting pipe between the input end of the first-level water washing tower spray device and the liquid output end of the second-level water washing tower.

[0019] In a possible implementation, a third delivery pump is provided on the connecting pipe between the input end of the secondary water washing tower spray device and the liquid output end of the tertiary water washing tower.

[0020] In a possible implementation, the secondary water scrubber has a first circulation pipe at one end close to the gas input end of the secondary water scrubber, and the first circulation pipe is connected to the connecting pipe between the primary water scrubber and the second delivery pump.

[0021] In a possible implementation, the third-stage water scrubber has a second circulation pipe at one end close to the gas input end of the third-stage water scrubber, and the second circulation pipe is connected to the connecting pipe between the secondary water scrubber and the third delivery pump.

[0022] In a possible implementation, a third circulation pipeline is further provided on the communication pipeline between the cooler and the outlet liquid separation tank, and the third circulation pipeline is communicated with the input end of the cooler.

[0023] Beneficial effects:

[0024] Through the high-efficiency methanol storage tank waste gas purification and recovery system provided in the present application, the waste gas generated by the methanol storage tank can be centrally treated, and the methanol therein can be recovered and sent to the distillation section, thereby improving the yield of methanol and generating certain economic benefits; and, by utilizing the characteristics of the combustion value of components such as carbon monoxide and hydrogen in the waste gas, the waste gas is pressurized and sent to the boiler as fuel for combustion assistance, thereby reducing exhaust gas emissions while reducing production costs, thereby achieving the purpose of reducing costs and increasing efficiency; finally, by recycling and reusing the exhaust gas emitted by the methanol storage tank, the unorganized emissions of volatile organic compounds are reduced, and the environmental pressure is reduced, which has certain environmental benefits and far-reaching promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0026] Figure 1 A schematic structural diagram of a high-efficiency methanol storage tank waste gas purification and recovery system provided in an embodiment of the present application.

[0027] Figure markings: 1-centrifugal fan; 2-primary water washing tower; 3-secondary water washing tower; 4-tertiary water washing tower; 5-third delivery pump; 6-second delivery pump; 7-first delivery pump; 8-gas-water separator; 9-compressor; 10-cooler; 11-export separator tank; 12-desalted water output module; 13-methanol storage tank waste gas output end; 14-first methanol-water solution collection module; 15-cooling return water collection module; 16-gas collection module; 17-second methanol-water solution collection module; 18-cooling return water output module. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0030] Example 1

[0031] Figure 1 An efficient methanol storage tank waste gas purification and recovery system provided in the embodiment of the present application comprises: a centrifugal fan 1, a primary water washing tower 2, a secondary water washing tower 3, and a tertiary water washing tower 4;

[0032] One end of the centrifugal fan 1 is connected to the exhaust gas output end 13 of the high-efficiency methanol storage tank, and the other end is connected to the gas input end of the primary water scrubber 2;

[0033] The gas output end of the primary water scrubber 2 is connected to the gas input end of the secondary water scrubber 3, the liquid output end of the primary water scrubber 2 is connected to the first methanol aqueous solution collecting module 14, and the input end of the spray device of the primary water scrubber 2 is connected to the liquid output end of the secondary water scrubber 3;

[0034] The gas output end of the secondary water scrubber 3 is connected to the gas input end of the tertiary water scrubber 4, and the input end of the spray device of the secondary water scrubber 3 is connected to the liquid output end of the tertiary water scrubber 4;

[0035] The gas output end of the three-stage water washing tower 4 is communicated with the gas collecting module 16 , and the input end of the spraying device of the three-stage water washing tower 4 is communicated with the desalted water output module 12 .

[0036] Optionally, the waste gas output end 13 of the high-efficiency methanol storage tank is the waste gas output end at the top of the high-efficiency methanol storage tank, and the waste gas is pumped to the primary water washing tower 2 through the centrifugal fan 1. The gas input end of the primary water washing tower 2 is located in the middle of the primary water washing tower 2, and the primary water washing tower 2 treats the waste gas by spraying desalted water.

[0037] Optionally, the gas collection module 16 is a device capable of storing and using uncompressed gas, such as a negative pressure gas storage tank, a vacuum gas storage tank, a boiler combustion chamber, etc.

[0038] In a possible embodiment, the high-efficiency methanol storage tank waste gas purification and recovery system also includes: a gas-water separator 8; the input end of the gas-water separator 8 is connected to the gas output end of the three-stage water washing tower 4, which is used to separate the gas from the liquid, and the gas output end of the gas-water separator 8 is connected to the gas collection module 16; the liquid output end of the gas-water separator 8 is connected to the second methanol water solution collection module 17. This embodiment can separate the gas and liquid of the waste gas after water treatment.

[0039] Optionally, the gas-water separator 8 further has a fourth circulation pipeline for re-introducing the gas entering the gas-water separator 8 into the third-stage water washing tower 4 for re-washing.

[0040] In a possible embodiment, the high-efficiency methanol storage tank waste gas purification and recovery system also includes: a compressor 9; the input end of the compressor 9 is connected to the gas output end of the three-stage water washing tower 4, for compressing the gas, the cooling water input end of the compressor 9 is connected to the cooling return water output module 18, the cooling water output end of the compressor 9 is connected to the cooling return water collection module 15, and the output end of the compressor 9 is connected to the gas collection module 16.

[0041] Among them, the compressed gas can be passed into a normal pressure gas tank for storage.

[0042] Optionally, the cooling return water output module 18 is connected to the cooling return water collection module 15 for easy recycling.

[0043] In a possible implementation, the high-efficiency methanol storage tank waste gas purification and recovery system further includes: a refrigeration separation system, including: a cooler 10, an outlet liquid separation tank 11;

[0044] The input end of the cooler 10 is connected to the gas output end of the three-stage water scrubber 4 for cooling the gas; the cooling water input end of the cooler 10 is connected to the cooling return water output module 18, and the cooling water output end of the cooler 10 is connected to the cooling return water collection module 15;

[0045] The gas output end of the outlet liquid separator 11 is communicated with the compressed gas collection module 16 , and the liquid output end of the outlet liquid separator 11 is communicated with the second methanol-water solution collection module 17 .

[0046] In a possible implementation, a first delivery pump 7 is provided on the connecting pipe between the liquid output end of the primary water washing tower 2 and the first methanol aqueous solution collecting module 14. This implementation can provide a pumping force for the liquid.

[0047] In a possible implementation, a second delivery pump 6 is provided on the connecting pipe between the input end of the spray device of the primary water washing tower 2 and the liquid output end of the secondary water washing tower 3. This implementation can provide pumping force for the liquid.

[0048] In a possible implementation, a third delivery pump 5 is provided on the connecting pipe between the input end of the spray device of the secondary water washing tower 3 and the liquid output end of the tertiary water washing tower 4. This implementation can provide pumping force for the liquid.

[0049] In a possible embodiment, the secondary water scrubber 3 has a first circulation pipe at one end close to the gas input end of the secondary water scrubber 3, and the first circulation pipe is connected to the connecting pipe between the primary water scrubber 2 and the second delivery pump 6. This embodiment can realize the circulation of liquid or gas through the second circulation pipe.

[0050] In a possible embodiment, the third-stage water scrubber 4 has a second circulation pipe at one end close to the gas input end of the third-stage water scrubber 4, and the second circulation pipe is connected to the connecting pipe between the secondary water scrubber 3 and the third delivery pump 5. This embodiment can realize the circulation of liquid or gas through the second circulation pipe.

[0051] In a possible embodiment, a third circulation pipe is provided on the connecting pipe between the cooler 10 and the outlet liquid separator 11, and the third circulation pipe is connected to the input end of the cooler 10. This embodiment can realize the circulation of liquid or gas through the second circulation pipe.

[0052] In a possible implementation, the first methanol-water solution collecting module 14 and the second methanol-water solution collecting module 17 may be any device capable of storing, using or processing methanol-water solution, such as a storage tank, a methanol purification device, or a concentration device.

[0053] In a possible implementation, the cooling water return collection module 15 and the cooling water return output module 18 may be any device capable of storing, providing, using or processing cooling water, such as a circulating water pipe or a water tank.

[0054] In a possible implementation, the gas collection module 16 may be any device such as a boiler or a gas storage device that can store, use or process combustible gases such as carbon monoxide and hydrogen.

[0055] In a possible implementation, the desalted water output module 12 may be any device capable of storing and providing desalted water, such as a water pipe or a water tank.

[0056] In a possible implementation manner, all of the above pipelines are provided with valves.

[0057] Working principle:

[0058] Open the desalted water output module 12 and the valve on the pipeline connected to it, open the primary, secondary and tertiary water washing towers, wait until water is sprayed out from the spray device of the primary water washing tower 2, open the exhaust gas output end 13 of the methanol storage tank and the valve on the pipeline connected to it, the exhaust gas enters the primary water washing tower 2 through the pipeline, enters the secondary water washing tower 3 after being washed, and the washing liquid enters the first methanol aqueous solution collection module 14; the exhaust gas enters the tertiary water washing tower 3 after being washed by the secondary water washing tower 3, and the washing liquid enters the spray device of the primary water washing tower 2 for spraying; the exhaust gas enters the gas-water separator 8 after being washed by the tertiary water washing tower 4, The washing liquid enters the spray device of the secondary water washing tower 3 for spraying; the liquid entering the gas-water separator 8 will be separated into gas and liquid after cooling, the liquid enters the tertiary water washing tower 4, the gas enters the compressor 9, and after being compressed by the compressor 9, the gas enters the cooler 10 of the refrigeration separation system for further cooling and gas-liquid separation in the outlet liquid separator 11. The separated gas contains combustible gases such as carbon monoxide and hydrogen, which are passed into a boiler for combustion assistance or into a gas collection module 16 such as a gas collection device. The separated liquid is passed into the second methanol aqueous solution collection module 17 to make full use of the exhaust gas from the methanol storage tank.

[0059] In the several embodiments provided in the present application, it should be understood that the disclosed systems, modules and methods can be implemented in other ways. For example, the module embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, modules or units, which can be electrical, mechanical or other forms.

[0060] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A highly efficient methanol storage tank waste gas purification and recovery system, It is characterized in that include: Centrifugal fan (1), primary water washing tower (2), secondary water washing tower (3), tertiary water washing tower (4); One end of the centrifugal fan (1) is connected to the waste gas output end (13) of the high-efficiency methanol storage tank, and the other end is connected to the gas input end of the primary water scrubber (2); The gas output end of the primary water scrubber (2) is connected to the gas input end of the secondary water scrubber (3), the liquid output end of the primary water scrubber (2) is connected to the first methanol aqueous solution collecting module (14), and the input end of the spray device of the primary water scrubber (2) is connected to the liquid output end of the secondary water scrubber (3); The gas output end of the secondary water scrubber (3) is connected to the gas input end of the tertiary water scrubber (4), and the input end of the spray device of the secondary water scrubber (3) is connected to the liquid output end of the tertiary water scrubber (4); The gas output end of the three-stage water washing tower (4) is in communication with the gas collecting module (16), and the input end of the spraying device of the three-stage water washing tower (4) is in communication with the desalted water output module (12).

2. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 1, It is characterized in that Also includes: A gas-water separator (8); the input end of the gas-water separator (8) is connected to the gas output end of the three-stage water washing tower (4) for performing gas-liquid separation on the gas, and the gas output end of the gas-water separator (8) is connected to the gas collection module (16); the liquid output end of the gas-water separator (8) is connected to the second methanol-water solution collection module (17).

3. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 1, It is characterized in that Also includes: A compressor (9); the input end of the compressor (9) is connected to the gas output end of the three-stage water washing tower (4) for compressing the gas, the cooling water input end of the compressor (9) is connected to the cooling return water output module (18), the cooling water output end of the compressor (9) is connected to the cooling return water collection module (15), and the output end of the compressor (9) is connected to the gas collection module (16).

4. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 1, It is characterized in that Also includes: A refrigeration separation system comprises: a cooler (10) and an outlet liquid separation tank (11); The input end of the cooler (10) is in communication with the gas output end of the three-stage water scrubber (4) for cooling the gas; the cooling water input end of the cooler (10) is in communication with the cooling return water output module (18), and the cooling water output end of the cooler (10) is in communication with the cooling return water collection module (15); The gas output end of the outlet liquid separator (11) is in communication with a compressed gas collection module (16), and the liquid output end of the outlet liquid separator (11) is in communication with a second methanol-water solution collection module (17).

5. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 1, It is characterized in that A first delivery pump (7) is provided on the connecting pipeline between the liquid output end of the primary water washing tower (2) and the first methanol aqueous solution collecting module (14).

6. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 1, It is characterized in that A second delivery pump (6) is provided on the connecting pipe between the input end of the spray device of the primary water washing tower (2) and the liquid output end of the secondary water washing tower (3).

7. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 1, It is characterized in that A third delivery pump (5) is provided on the connecting pipe between the input end of the spray device of the secondary water washing tower (3) and the liquid output end of the tertiary water washing tower (4).

8. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 6, It is characterized in that The secondary water scrubber (3) also has a first circulation pipeline at one end close to the gas input end of the secondary water scrubber (3), and the first circulation pipeline is connected to the connecting pipeline between the primary water scrubber (2) and the second delivery pump (6).

9. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 7, It is characterized in that The third-stage water scrubber (4) also has a second circulation pipeline at one end close to the gas input end of the third-stage water scrubber (4), and the second circulation pipeline is connected to the connecting pipeline between the second-stage water scrubber (3) and the third delivery pump (5).

10. The high-efficiency methanol storage tank waste gas purification and recovery system according to claim 4, It is characterized in that The communicating pipe between the cooler (10) and the outlet liquid separation tank (11) is also provided with a third circulating pipe, and the third circulating pipe is connected to the input end of the cooler (10).

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