Natural gas extraction waste gas purification device

Abstract

The utility model discloses a natural gas extraction waste gas purification device which comprises a first three-way pipeline, an exhaust port of the first three-way pipeline is communicated with a purification assembly used for purifying volatile organic compounds in natural gas extraction waste gas, and one end of the purification assembly is communicated with a first connecting pipeline. One end of the first connecting pipeline is communicated with an SCR reactor, and an exhaust port of the SCR reactor is communicated with an absorption assembly used for absorbing carbon dioxide in natural gas extraction waste gas; through the synergistic effect of all the structures of the purification assembly, volatile organic compounds such as methane, ethane and ethylene in the natural gas extraction waste gas can be efficiently adsorbed and removed, so that pollution of harmful substances to the air environment is remarkably reduced, and through the synergistic effect of all the structures of the absorption assembly, the purification effect is improved. Carbon dioxide in waste gas can be efficiently absorbed, emission of greenhouse gas is effectively reduced, and the problem of global warming can be relieved.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas purification devices, specifically a waste gas purification device for natural gas extraction. Background Technology

[0002] Waste gas refers to toxic and harmful gases emitted by humans during production and daily life. Waste gas generated during natural gas extraction mainly includes sulfur-containing gases (hydrogen sulfide and sulfur dioxide), carbon dioxide, volatile organic compounds (methane, ethane, ethylene, propylene, etc.), nitrogen oxides (nitric oxide and nitrogen dioxide), and solid particulate matter.

[0003] Chinese Patent No. CN214598198U discloses a waste gas purification and environmental protection device, including a base. A mixing box is fixedly installed on the top of the base. An air inlet pipe is fixedly installed on one side of the mixing box, with one end extending into the interior of the mixing box. A water inlet pipe is fixedly installed on the top of the mixing box, with one end extending into the interior of the mixing box. A working box is fixedly installed on the top of the mixing box. This waste gas purification and environmental protection device, through the coordinated use of a desulfurizing agent pipe, a compression plug, a compression box, and a rotating table, prevents harmful substances in the waste gas from entering the environment. For example, waste gas from coking plants produces harmful sulfides. If these are discharged into the air without desulfurization, they will affect the environment and human health. The rotating table can spray the desulfurizing agent through atomization to purify the sulfides in the waste gas and prevent the discharged waste gas from polluting the environment.

[0004] The aforementioned patents also have some shortcomings. While they are very effective in treating particulate matter and sulfur-containing waste gas, they are ineffective in treating volatile organic compounds, nitrogen oxides, and carbon dioxide. If not properly addressed, they will cause significant air pollution. Therefore, we need to propose a natural gas extraction waste gas purification device. Utility Model Content

[0005] The purpose of this invention is to provide a natural gas extraction waste gas purification device that has the advantages of treating volatile organic compounds, nitrogen oxides and carbon dioxide, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a natural gas extraction waste gas purification device, comprising a first three-way pipe, the exhaust port of the first three-way pipe being connected to a purification component for purifying volatile organic compounds in natural gas extraction waste gas, one end of the purification component being connected to a first connecting pipe, one end of the first connecting pipe being connected to an SCR reactor, and the exhaust port of the SCR reactor being connected to an absorption component for absorbing carbon dioxide in natural gas extraction waste gas.

[0007] Preferably, the purification component includes a first pipe and a second three-way pipe. One end of the first pipe is connected to the exhaust port of the first three-way pipe, and a first control valve is connected to the surface of the first pipe. The other end of the first pipe is connected to a purification tower. An activated carbon adsorption layer is installed inside the purification tower. A first gas detector is installed on the upper side of the inner wall of the purification tower near the activated carbon adsorption layer. The top of the purification tower is connected to a second pipe, and a second control valve is connected to the surface of the second pipe. One end of the second pipe is connected to the air inlet of the second three-way pipe, and the exhaust port of the second three-way pipe is connected to one end of a first connecting pipe.

[0008] Preferably, a first vacuum pump is connected to the lower side of the purification tower near the activated carbon adsorption layer, the exhaust port of the first vacuum pump is connected to a first waste gas pipe, and a third control valve is connected to the surface of the first waste gas pipe.

[0009] Preferably, the absorption assembly includes a second connecting pipe, one end of which is connected to the exhaust port of the SCR reactor, the end of which is away from the SCR reactor is connected to an absorption tower and extends to the bottom of the absorption tower, and a fifth control valve is connected to the surface of the second connecting pipe.

[0010] Preferably, an amine absorbent is installed inside the absorption tower, a motor is installed at the top of the absorption tower, the output end of the motor passes through the absorption tower and is equipped with a stirring shaft, and stirring blades are installed on the surface of the stirring shaft.

[0011] Preferably, a second gas detector is installed on the upper side of the inner wall of the absorption tower near the amine absorbent, and the exhaust port of the absorption tower is connected to an exhaust pipe, the surface of which is connected to a sixth control valve.

[0012] Preferably, the absorption tower is internally connected to a second vacuum pump, the exhaust port of the second vacuum pump is connected to a second waste gas pipe, and the surface of the second waste gas pipe is connected to a seventh control valve.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model, through the synergistic effect of various structures in the purification component, can efficiently adsorb and remove volatile organic compounds such as methane, ethane, ethylene, and propylene from natural gas extraction waste gas, thereby significantly reducing the pollution of these harmful substances to the air environment.

[0015] 2. This utility model, through the synergistic effect of various structures in the absorption component, can efficiently absorb carbon dioxide in exhaust gas, effectively reduce greenhouse gas emissions, and help alleviate the problem of global warming.

[0016] 3. This utility model has multiple control valves, which can flexibly adjust the working status of each component to ensure the stability and efficiency of the purification process. At the same time, it is easy to operate, maintain and repair. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the purification component structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the absorption component structure of this utility model;

[0020] Figure 4 This is a cross-sectional view of the adsorption tower structure of this utility model.

[0021] In the diagram: 1. First tee pipe; 2. First connecting pipe; 3. SCR reactor; 4. First pipe; 5. Second tee pipe; 6. First control valve; 7. Purification tower; 8. Activated carbon adsorption layer; 9. First gas detector; 10. Second pipe; 11. Second control valve; 12. First vacuum pump; 13. First exhaust gas pipe; 14. Third control valve; 16. Second connecting pipe; 17. Absorption tower; 18. Fifth control valve; 19. Amine absorbent; 20. Motor; 21. Stirring shaft; 22. Stirring blade; 23. Second gas detector; 24. Exhaust pipe; 25. Sixth control valve; 26. Second vacuum pump; 27. Second exhaust gas pipe; 28. Seventh control valve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4This utility model provides a technical solution: a natural gas extraction waste gas purification device, including a first three-way pipe 1. The exhaust port of the first three-way pipe 1 is connected to a purification component for purifying volatile organic compounds in the natural gas extraction waste gas. One end of the purification component is connected to a first connecting pipe 2, and one end of the first connecting pipe 2 is connected to an SCR reactor 3. The exhaust port of the SCR reactor 3 is connected to an absorption component for absorbing carbon dioxide in the natural gas extraction waste gas. By setting up the SCR reactor 3 and placing a catalyst, such as a catalyst with vanadium-titanium as the active ingredient, in the SCR reactor 3, a reducing agent (such as ammonia) is injected into the waste gas. Under the action of the catalyst, nitrogen oxides react with the reducing agent to generate nitrogen and water, thereby removing nitrogen oxides.

[0024] The purification assembly includes a first pipe 4 and a second three-way pipe 5. One end of the first pipe 4 is connected to the exhaust port of the first three-way pipe 1. A first control valve 6 is connected to the surface of the first pipe 4 to control the flow rate of the exhaust gas in the first pipe 4. The other end of the first pipe 4 is connected to a purification tower 7. Two purification towers 7 are arranged in a mirror image. An activated carbon adsorption layer 8 is installed inside the purification tower 7. A first gas detector 9 is installed on the inner wall of the purification tower 7 near the upper side of the activated carbon adsorption layer 8. The top of the purification tower 7 is connected to a second pipe 10. A second control valve 11 is connected to the surface of the second pipe 10 to control the flow rate of the exhaust gas in the second pipe 10. One end of the second pipe 10 is connected to the air inlet of the second three-way pipe 5. The exhaust port of the second three-way pipe 5 is connected to one end of the first connecting pipe 2.

[0025] A first vacuum pump 12 is connected to the lower side of the purification tower 7 near the activated carbon adsorption layer 8. The exhaust port of the first vacuum pump 12 is connected to a first waste gas pipe 13, and a third control valve 14 is connected to the surface of the first waste gas pipe 13. The content of volatile organic compounds in the waste gas is monitored in real time by a first gas detector 9. When the content of volatile organic compounds in the waste gas reaches a threshold, it indicates that the absorption capacity of the activated carbon adsorption layer 8 is approaching saturation. At this time, the first control valve 6 and the second control valve 11 are closed, and the third control valve 14 is opened. The first vacuum pump 12 is driven to reduce the pressure of the purification tower 7. During the pressure reduction process, volatile organic compounds are desorbed from the activated carbon adsorption layer 8, thereby regenerating the activated carbon adsorption layer 8. The desorbed volatile organic compounds are collected or further processed through the first waste gas pipe 13. By setting two purification towers 7 in a mirror image, one purification tower 7 can be in the process of low-pressure desorption while the other is working normally, thereby improving the efficiency of waste gas treatment.

[0026] The absorption assembly includes a second connecting pipe 16, one end of which is connected to the exhaust port of the SCR reactor 3, and the end of the second connecting pipe 16 away from the SCR reactor 3 is connected to an absorption tower 17 and extends to the bottom of the absorption tower 17. Two absorption towers 17 are arranged in a mirror image. A fifth control valve 18 is connected to the surface of the second connecting pipe 16. The fifth control valve 18 is used to control the flow rate of waste gas through the second connecting pipe 16.

[0027] An amine absorbent 19 (such as an ethanolamine solution) is installed inside the absorption tower 17. A motor 20 is installed at the top of the absorption tower 17. The output end of the motor 20 passes through the absorption tower 17 and is equipped with a stirring shaft 21. Stirring blades 22 are installed on the surface of the stirring shaft 21. The stirring shaft 21 and the stirring blades 22 are in contact with the amine absorbent 19.

[0028] A second gas detector 23 is installed on the inner wall of the absorption tower 17 near the upper side of the amine absorbent 19. The exhaust port of the absorption tower 17 is connected to an exhaust pipe 24. A sixth control valve 25 is connected to the surface of the exhaust pipe 24. The sixth control valve 25 is used to regulate the flow rate of the purified gas through the exhaust pipe 24.

[0029] Specifically, after the natural gas extraction waste gas undergoes desulfurization and particulate matter treatment, the treated waste gas enters the first pipe 4 through the two exhaust ports of the first three-way pipe 1. At this time, the first control valve 6 is opened, and the waste gas enters the interior of the purification tower 7 through the first pipe 4. An activated carbon adsorption layer 8 is installed, utilizing the porous structure and large specific surface area of ​​activated carbon to provide numerous adsorption sites for the physical adsorption of hydrocarbon gases. This adsorption of volatile organic compounds (methane, ethane, ethylene, propylene, etc.) in the waste gas significantly reduces the pollution of the air environment by these harmful substances. After being filtered by the activated carbon adsorption layer 8 and passing the test of the first gas detector 9, the waste gas enters the second pipe 10. By opening the second control valve 11, the waste gas enters the second three-way pipe 5 through the second pipe 10. The gas enters the SCR reactor 3 through the second three-way pipe 5 and the first connecting pipe 2. After nitrogen oxides are removed by the SCR reactor 3, the carbon dioxide-containing waste gas is discharged into the absorption tower 17 containing amine absorbent 19 through the second connecting pipe 16. At this time, the drive motor 20 drives the stirring shaft 21 to rotate, thereby driving the stirring blade 22 to rotate. The stirring blade 22 stirs the amine absorbent 19, making it fully combine with the carbon dioxide-containing waste gas, thereby more effectively absorbing the carbon dioxide in the waste gas, thus improving the efficiency of carbon dioxide removal, effectively reducing greenhouse gas emissions, and helping to alleviate the problem of global warming. The second gas detector 23 detects the gas after it has been fully absorbed by the amine absorbent 19 in real time. When the detection is qualified, the purified gas is discharged into the air through the exhaust pipe 24.

[0030] The absorption tower 17 is internally connected to a second vacuum pump 26, and the exhaust port of the second vacuum pump 26 is connected to a second waste gas pipeline 27. The surface of the first exhaust port of the second waste gas pipeline 27 is connected to a seventh control valve 28. The carbon dioxide content in the waste gas is monitored in real time by a second gas detector 23. When the carbon dioxide content in the waste gas reaches a threshold, it indicates that the absorbency of the amine absorbent 19 is approaching saturation. At this time, the fifth control valve 18 and the sixth control valve 25 are closed, and the seventh control valve 28 is opened. This drives the second vacuum pump 26 to reduce the pressure in the absorption tower 17. During the pressure reduction process, carbon dioxide is desorbed from the amine absorbent 19, thereby regenerating the amine absorbent 19. The desorbed carbon dioxide is collected or further processed through the second waste gas pipeline 27. By mirroring the two absorption towers 17, one absorption tower 17 can be in the process of low-pressure desorption while the other is working normally, thereby improving the efficiency of waste gas treatment.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A natural gas production off-gas purification apparatus comprising a first tee pipe (1), characterized in that: The exhaust port of the first tee pipe (1) is communicated with a purification assembly for purifying volatile organic compounds in natural gas exploitation waste gas, one end of the purification assembly is communicated with a first connecting pipe (2), one end of the first connecting pipe (2) is communicated with an SCR reactor (3), and the exhaust port of the SCR reactor (3) is communicated with an absorption assembly for absorbing carbon dioxide in natural gas exploitation waste gas.

2. A natural gas production off-gas purification apparatus according to claim 1, characterized in that: The purification assembly comprises a first pipe (4) and a second tee pipe (5), one end of the first pipe (4) is communicated with the exhaust port of the first tee pipe (1), the surface of the first pipe (4) is communicated with a first control valve (6), the other end of the first pipe (4) is communicated with a purification tower (7), the inside of the purification tower (7) is installed with an activated carbon adsorption layer (8), the inside wall of the purification tower (7) is installed with a first gas detector (9) near the upper side of the activated carbon adsorption layer (8), the top of the purification tower (7) is communicated with a second pipe (10), the surface of the second pipe (10) is communicated with a second control valve (11), one end of the second pipe (10) is communicated with the gas inlet of the second tee pipe (5), and the exhaust port of the second tee pipe (5) is communicated with one end of the first connecting pipe (2).

3. A natural gas production off-gas purification apparatus according to claim 2, characterized in that: The purification tower (7) is communicated with a first vacuum pump (12) near the lower side of the activated carbon adsorption layer (8), the exhaust port of the first vacuum pump (12) is communicated with a first waste gas pipe (13), and the surface of the first waste gas pipe (13) is communicated with a third control valve (14).

4. A natural gas production off-gas purification apparatus according to claim 3, characterized in that: The absorption assembly comprises a second connecting pipe (16), one end of the second connecting pipe (16) is communicated with the exhaust port of the SCR reactor (3), the end of the second connecting pipe (16) away from the SCR reactor (3) is communicated with an absorption tower (17) and extends to the bottom of the absorption tower (17), and the surface of the second connecting pipe (16) is communicated with a fifth control valve (18).

5. A natural gas production off-gas purification apparatus according to claim 4, characterized in that: The inside of the absorption tower (17) is installed with an amine absorbent (19), the top of the absorption tower (17) is installed with a motor (20), the output end of the motor (20) penetrates through the absorption tower (17) and is installed with a stirring shaft (21), and the surface of the stirring shaft (21) is installed with stirring blades (22).

6. A natural gas production off-gas purification apparatus according to claim 5, characterized in that: The inside wall of the absorption tower (17) is installed with a second gas detector (23) near the upper side of the amine absorbent (19), the exhaust port of the absorption tower (17) is communicated with an exhaust pipe (24), and the surface of the exhaust pipe (24) is communicated with a sixth control valve (25).

7. A natural gas production off-gas purification apparatus according to claim 6, characterized in that: The inside of the absorption tower (17) is communicated with a second vacuum pump (26), the exhaust port of the second vacuum pump (26) is communicated with a second waste gas pipe (27), and the surface of the second waste gas pipe (27) is communicated with a seventh control valve (28).

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