CN211837274U - Natural gas purification and desulfurization system - Google Patents
Natural gas purification and desulfurization system Download PDFInfo
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- CN211837274U CN211837274U CN202020122890.4U CN202020122890U CN211837274U CN 211837274 U CN211837274 U CN 211837274U CN 202020122890 U CN202020122890 U CN 202020122890U CN 211837274 U CN211837274 U CN 211837274U
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Abstract
The utility model provides a natural gas purification and desulfurization system, which comprises a desulfurization absorption tower, a flash tank, a first heat exchanger, an amine liquid regeneration tower and a compressor, the device comprises a first heat exchanger, a first condenser and an expansion valve, wherein a feed inlet of a desulfurization absorption tower is communicated with feed gas, the top of the desulfurization absorption tower is provided with an exhaust port, the bottom of the desulfurization absorption tower is communicated with a liquid inlet of a flash tank, a rich liquid inlet of the first heat exchanger is communicated with a liquid outlet of the flash tank, a rich liquid outlet of the first heat exchanger is communicated with a feed inlet on the upper part of an amine liquid regeneration tower, a lean liquid inlet of the first heat exchanger is communicated with the bottom of the amine liquid regeneration tower, a lean liquid outlet of the first heat exchanger is communicated with a feed inlet on the desulfurization absorption tower, acid gas discharged from the top of the amine liquid regeneration tower is sequentially communicated with a compressor, the first heat exchanger, the first condenser and the expansion valve through pipelines. The system can utilize the heat energy in the acid gas discharged from the top of the amine liquid regeneration tower, and reduce energy loss.
Description
Technical Field
The utility model relates to a natural gas processing technology field, concretely relates to natural gas purifies desulfurization system.
Background
The demand of natural gas as a clean energy source is increasing, but many gas wells often contain acidic gases such as hydrogen sulfide in the mining process, and the hydrogen sulfide can cause corrosion of equipment and pipelines, pollute the environment, is harmful to human health, and influences the gathering, transportation, treatment and use of the natural gas, so that the natural gas is inevitably subjected to desulfurization treatment.
At present, in a sulfur-containing natural gas treatment plant, an alcohol amine process is usually adopted to remove hydrogen sulfide gas in natural gas, wet purified gas after absorbing the hydrogen sulfide gas is sent to a dehydration system for dehydration treatment, and the dehydrated purified natural gas is sent to a user for use through a gas transmission pipeline. The utility model discloses an inventor discovers through the research, the in-process of hydrogen sulfide gas body in adopting the hydramine technology desorption natural gas at present, on the one hand in order to set up the steam generation chamber that needs to consume more energy for the heating of half barren liquor in the amine liquid regenerator column in its inside, on the other hand amine liquid regenerator column top gas vent exhaust sour gas is through cooler cooling and vapour and liquid separator separation back, the amine liquid regenerator column top that flows back again carries out the backflow circulation, nevertheless contain a large amount of heat energy but not utilized in the sour gas of amine liquid regenerator column top exhaust, therefore how to find urgent need to utilize the heat energy that contains in the sour gas for reducing the energy consumption, become the technical problem that waits to solve at present.
SUMMERY OF THE UTILITY MODEL
In-process to hydrogen sulfide gas body in the current hydramine technology desorption natural gas that adopts, in order to set up the steam generation chamber that needs to consume more energy inside it for the heating of half barren liquor in the amine liquid regenerator, contain a large amount of heat energy but not utilized in the amine liquid regenerator top gas vent discharge sour gas simultaneously, consequently how to contain heat energy in to the sour gas and utilize the technical problem with the reduction energy consumption, the utility model provides a natural gas purifies desulfurization system.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a natural gas purifies desulfurization system, includes desulfurization absorption tower, flash tank, first heat exchanger, amine liquid regenerator, compressor, second heat exchanger, condenser and expansion valve, the feed inlet of desulfurization absorption tower is used for letting in the feed gas, the top of desulfurization absorption tower is equipped with the gas vent, the bottom of desulfurization absorption tower is passed through the inlet intercommunication of pipeline with the flash tank, the liquid outlet intercommunication of pipeline and flash tank is passed through in first heat exchanger's rich liquid import, first heat exchanger's rich liquid export is through pipeline and amine liquid regenerator upper portion's last feed inlet intercommunication, first heat exchanger's barren liquid import is passed through pipeline and amine liquid regenerator's bottom intercommunication, first heat exchanger's barren liquid export is passed through pipeline and desulfurization absorption tower's last feed inlet intercommunication, the top of desulfurization absorption tower is equipped with the gas vent, the acid gas of amine liquid regenerator top gas vent discharge passes through pipeline order and compressor, The second heat exchanger, the condenser and the expansion valve are communicated, a liquid outlet of the expansion valve is communicated with the upper part of the amine liquid regeneration tower, the bottom of the amine liquid regeneration tower is also communicated with a barren solution inlet of the second heat exchanger through a pipeline, and a barren solution outlet of the second heat exchanger is communicated with the lower part of the amine liquid regeneration tower through a pipeline.
Compared with the prior art, the utility model provides an among the natural gas purification desulfurization system, pass through pipeline order and compressor with the sour gas of amine liquid regeneration tower top gas vent exhaust, the second heat exchanger, condenser and expansion valve intercommunication, the liquid outlet of expansion valve communicates with the upper portion of amine liquid regeneration tower, the bottom of amine liquid regeneration tower is passed through the pipeline and is still communicate with the barren liquor import of second heat exchanger simultaneously, the barren liquor export of second heat exchanger communicates through the lower part of pipeline with amine liquid regeneration tower, therefore when the higher sour gas of temperature of amine liquid regeneration tower top exhaust after the compressor compression, become the higher gas of pressure and get into the second heat exchanger, because the barren liquor temperature that flows into the second heat exchanger from the amine liquid regeneration tower bottom is low, the gas temperature that gets into the second heat exchanger from the compressor is high, therefore gaseous heat will be transmitted in the second heat exchanger and give the barren liquor, the temperature of the barren solution flowing out of the barren solution outlet of the second heat exchanger and entering the lower part of the amine solution regeneration tower is increased, meanwhile, the temperature of the gas flowing out of the second heat exchanger is reduced, the energy required by heating and steam generation in the amine solution regeneration tower is reduced by the barren solution after the temperature is increased, meanwhile, the gas after the temperature is reduced releases heat again in the condenser and becomes liquid, and the liquid enters the top of the amine solution regeneration tower again for circulation after being expanded and reduced in pressure by the expansion valve, so that the utilization of heat energy in acid gas discharged from the top of the amine solution regeneration tower is realized, and the energy loss of the heating and steam generation in the amine solution regeneration tower is reduced.
Further, a filter is arranged on a pipeline between the liquid outlet of the flash tank and the rich liquid inlet of the first heat exchanger.
Furthermore, a booster pump is arranged on a pipeline between the liquid outlet of the filter and the rich liquid inlet of the first heat exchanger.
Further, amine liquid regenerator's inside has steam generation chamber and steam heating chamber, steam heating chamber is located the top in steam generation chamber, amine liquid regenerator's gas vent is located steam heating chamber's top, steam heating chamber passes through the liquid outlet intercommunication of pipeline respectively with first heat exchanger's rich solution export and expansion valve, steam generation chamber passes through the pipeline respectively with first heat exchanger's barren liquor import and second heat exchanger's barren liquor import and barren liquor export intercommunication.
Drawings
Fig. 1 is a schematic diagram of the composition of the natural gas purification and desulfurization system provided by the utility model.
In the figure, 1, a desulfurization absorption tower; 2. a flash tank; 3. a first heat exchanger; 4. an amine liquid regeneration tower; 41. a steam generating chamber; 42. a steam heating cavity; 5. a compressor; 6. a second heat exchanger; 7. a condenser; 8. an expansion valve; 9. a filter; 10. a booster pump.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the utility model provides a natural gas purification and desulfurization system, including desulfurization absorption tower 1, flash tank 2, first heat exchanger 3, amine liquid regenerator 4, compressor 5, second heat exchanger 6, condenser 7 and expansion valve 8, the feed inlet of desulfurization absorption tower 1 is used for letting in the feed gas, the feed gas gets into desulfurization absorption tower 1 from the feed inlet and contacts with the barren liquor of top-down (being barren amine liquid) countercurrent, almost all acid gases such as hydrogen sulfide in the natural gas are got rid of, the top of desulfurization absorption tower 1 is equipped with the gas vent, and the wet purified gas of getting rid of acid gas is discharged from this gas vent, the bottom of desulfurization absorption tower 1 is communicated with the inlet of flash tank 2 through the pipeline, and rich liquid (being rich amine liquid) that has absorbed the acid gas comes out from desulfurization absorption tower 1 bottom and realizes vaporization and vapor-liquid separation through flash tank 2 decompression, a rich liquid inlet of the first heat exchanger 3 is communicated with a liquid outlet of the flash tank 2 through a pipeline, a rich liquid outlet of the first heat exchanger 3 is communicated with an upper feed inlet at the upper part of the amine liquid regeneration tower 4 through a pipeline, a lean liquid inlet of the first heat exchanger 3 is communicated with the bottom of the amine liquid regeneration tower 4 through a pipeline, a lean liquid outlet of the first heat exchanger 3 is communicated with an upper feed inlet of the desulfurization absorption tower 1 through a pipeline, so that the rich liquid from the bottom of the flash tank 2 and the lean liquid from the bottom of the amine liquid regeneration tower 4 realize heat exchange in the first heat exchanger 3, the lean liquid with reduced temperature enters the upper feed inlet of the desulfurization absorption tower 1, the rich liquid with increased temperature enters the upper feed inlet at the upper part of the amine liquid regeneration tower 4, the rich liquid at the upper part of the amine liquid regeneration tower 4 flows from top to bottom, and acidic gases such as hydrogen sulfide are desorbed through steam stripping from, the acid gas (i.e. the acid gas) discharged from the top exhaust port of the amine liquid regeneration tower 4 is sequentially communicated with a compressor 5, a second heat exchanger 6, a condenser 7 and an expansion valve 8 through pipelines, a liquid outlet of the expansion valve 8 is communicated with the upper part of the amine liquid regeneration tower 4, the bottom of the amine liquid regeneration tower 4 is simultaneously communicated with a barren liquid inlet of the second heat exchanger 6 through a pipeline, a barren liquid outlet of the second heat exchanger 6 is communicated with the lower part of the amine liquid regeneration tower 4 through a pipeline, the compressor 5 is used for compressing the acid gas with higher temperature discharged from the top exhaust port of the amine liquid regeneration tower 4 to ensure that the pressure and the temperature of the compressed acid gas are higher, the second heat exchanger 6 is used for realizing heat exchange between the barren liquid discharged from the bottom of the amine liquid regeneration tower 4 and the acid gas compressed from the compressor 5 to ensure that the heat of the acid gas is transferred to the barren liquid in the second heat exchanger 6, so that the temperature of the lean liquid flowing out of the lean liquid outlet of the second heat exchanger 6 and entering the lower part of the amine liquid regeneration tower 4 is increased, and the temperature of the acid gas flowing out of the second heat exchanger 6 is reduced, the condenser 7 is used for letting the acid gas with reduced temperature release heat again and become liquid, and the expansion valve 8 is used for expanding and reducing the pressure of the liquid and then entering the top of the amine liquid regeneration tower 4 again for circulation so as to maintain the heat balance as the reflux liquid of the amine liquid regeneration tower 4.
Compared with the prior art, the utility model provides an among the natural gas purification desulfurization system, pass through pipeline order and compressor with the sour gas of amine liquid regeneration tower top gas vent exhaust, the second heat exchanger, condenser and expansion valve intercommunication, the liquid outlet of expansion valve communicates with the upper portion of amine liquid regeneration tower, the bottom of amine liquid regeneration tower is passed through the pipeline and is still communicate with the barren liquor import of second heat exchanger simultaneously, the barren liquor export of second heat exchanger communicates through the lower part of pipeline with amine liquid regeneration tower, therefore when the higher sour gas of temperature of amine liquid regeneration tower top exhaust after the compressor compression, become the higher gas of pressure and get into the second heat exchanger, because the barren liquor temperature that flows into the second heat exchanger from the amine liquid regeneration tower bottom is low, the gas temperature that gets into the second heat exchanger from the compressor is high, therefore gaseous heat will be transmitted in the second heat exchanger and give the barren liquor, the temperature of the barren solution flowing out of the barren solution outlet of the second heat exchanger and entering the lower part of the amine solution regeneration tower is increased, meanwhile, the temperature of the gas flowing out of the second heat exchanger is reduced, the energy required by heating and steam generation in the amine solution regeneration tower is reduced by the barren solution after the temperature is increased, meanwhile, the gas after the temperature is reduced releases heat again in the condenser and becomes liquid, and the liquid enters the top of the amine solution regeneration tower again for circulation after being expanded and reduced in pressure by the expansion valve, so that the utilization of heat energy in acid gas discharged from the top of the amine solution regeneration tower is realized, and the energy loss of the heating and steam generation in the amine solution regeneration tower is reduced.
As a specific embodiment, referring to fig. 1, a filter 9 is disposed on a pipeline between the liquid outlet of the flash tank 2 and the rich liquid inlet of the first heat exchanger 3, and the filter 9 is configured to filter out impurities such as solid particles in the amine-rich liquid.
As an embodiment, referring to fig. 1, a booster pump 10 is further disposed on a pipeline between the liquid outlet of the filter 9 and the rich liquid inlet of the first heat exchanger 3, so that the rich liquid from the liquid outlet of the filter 9 can be easily sent to the rich liquid inlet of the first heat exchanger 3 by the booster pump 10, so as to transfer the heat of the lean liquid to the rich liquid in the first heat exchanger 3.
As a specific example, the specific structures of the desulfurization absorbing tower 1, the flash tank 2, the first heat exchanger 3, the amine liquid regeneration tower 4, the compressor 5, the second heat exchanger 6, the condenser 7, and the expansion valve 8 are well known to those skilled in the art. As a specific embodiment, referring to fig. 1, the amine liquid regeneration tower 4 has a steam generation chamber 41 and a steam heating chamber 42 inside, the steam heating chamber 42 is located above the steam generation chamber 41, the exhaust port of the amine liquid regeneration tower 4 is located at the top of the steam heating chamber 42, the steam heating chamber 42 is respectively communicated with the rich liquid outlet of the first heat exchanger 3 and the liquid outlet of the expansion valve 8 through pipes, the steam generation chamber 41 is respectively communicated with the lean liquid inlet of the first heat exchanger 3 and the lean liquid inlet and the lean liquid outlet of the second heat exchanger 6 through pipes, so that the lean liquid heated by the temperature increase entering the lower part of the amine liquid regeneration tower 4 from the lean liquid outlet of the second heat exchanger 6 generates steam in the steam generation chamber 41, and the steam generated in the steam generation chamber 41 can rise into the steam heating chamber 42 to secondarily heat the rich liquid in the chamber, after the temperature of the rich solution is raised, more acidic gases such as hydrogen sulfide and the like can be separated out by steam stripping.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (4)
1. The natural gas purification and desulfurization system is characterized by comprising a desulfurization absorption tower (1), a flash tank (2), a first heat exchanger (3), an amine liquid regeneration tower (4), a compressor (5), a second heat exchanger (6), a condenser (7) and an expansion valve (8), wherein a feed inlet of the desulfurization absorption tower (1) is used for introducing a feed gas, an exhaust port is arranged at the top of the desulfurization absorption tower (1), the bottom of the desulfurization absorption tower (1) is communicated with a liquid inlet of the flash tank (2) through a pipeline, a rich liquid inlet of the first heat exchanger (3) is communicated with a liquid outlet of the flash tank (2) through a pipeline, a rich liquid outlet of the first heat exchanger (3) is communicated with an upper feed inlet at the upper part of the amine liquid regeneration tower (4) through a pipeline, a lean liquid inlet of the first heat exchanger (3) is communicated with the bottom of the amine liquid regeneration tower (4) through a pipeline, the barren liquor of first heat exchanger (3) exports the feed inlet intercommunication on through pipeline and desulfurization absorption tower (1), amine liquid regeneration tower (4) top gas vent exhaust sour gas passes through pipeline order and communicates with compressor (5), second heat exchanger (6), condenser (7) and expansion valve (8), the liquid outlet of expansion valve (8) and the upper portion intercommunication of amine liquid regeneration tower (4), the bottom of amine liquid regeneration tower (4) is passed through the pipeline and is still communicate with the barren liquor import of second heat exchanger (6) simultaneously, the barren liquor export of second heat exchanger (6) passes through the lower part intercommunication of pipeline and amine liquid regeneration tower (4).
2. The natural gas purification and desulfurization system according to claim 1, characterized in that a filter (9) is arranged on a pipeline between the liquid outlet of the flash tank (2) and the rich liquid inlet of the first heat exchanger (3).
3. The natural gas purification and desulfurization system as claimed in claim 2, wherein a booster pump (10) is further arranged on a pipeline between the liquid outlet of the filter (9) and the rich liquid inlet of the first heat exchanger (3).
4. The natural gas purification and desulfurization system according to claim 1, wherein the amine liquid regeneration tower (4) is internally provided with a steam generation chamber (41) and a steam heating chamber (42), the steam heating chamber (42) is positioned above the steam generation chamber (41), the exhaust port of the amine liquid regeneration tower (4) is positioned at the top of the steam heating chamber (42), the steam heating chamber (42) is respectively communicated with the rich liquid outlet of the first heat exchanger (3) and the liquid outlet of the expansion valve (8) through pipelines, and the steam generation chamber (41) is respectively communicated with the lean liquid inlet of the first heat exchanger (3) and the lean liquid inlet and the lean liquid outlet of the second heat exchanger (6) through pipelines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020122890.4U CN211837274U (en) | 2020-01-19 | 2020-01-19 | Natural gas purification and desulfurization system |
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| CN202020122890.4U CN211837274U (en) | 2020-01-19 | 2020-01-19 | Natural gas purification and desulfurization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432887A (en) * | 2021-12-29 | 2022-05-06 | 江苏新海石化有限公司 | Amine liquid regeneration circulation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432887A (en) * | 2021-12-29 | 2022-05-06 | 江苏新海石化有限公司 | Amine liquid regeneration circulation system |
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