CN105202866A - Low-concentration gas liquefying device and method thereof - Google Patents
Low-concentration gas liquefying device and method thereof Download PDFInfo
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- CN105202866A CN105202866A CN201510660931.9A CN201510660931A CN105202866A CN 105202866 A CN105202866 A CN 105202866A CN 201510660931 A CN201510660931 A CN 201510660931A CN 105202866 A CN105202866 A CN 105202866A
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Abstract
The invention provides a low-concentration gas liquefying device which comprises a booster compressor. A purifying device is arranged at the front end of the booster compressor. The rear end of the booster compressor is connected with a dehydration device through a gas-liquid separator. The low-concentration gas liquefying device is characterized in that an enriching device is connected to the rear end of the dehydration device, and the rear end of the enriching device is connected with a high-pressure jet liquefying device through a joint compressor. The low-concentration gas liquefying device has the advantages of being suitable for liquefying 20%-40% low-concentration gas, enlarging the gas utilization range, being small in investment and high in liquid output speed, and having high economic benefits.
Description
Technical field
The present invention relates to device in Gas preparing liquefied natural gas technical field; Be specifically related to a kind of low concentration (methane concentration is 20% ~ 40%) device in Gas concentration liquid gasifying device and method thereof.
Background technology
Coal bed gas is commonly called as device in Gas, and its main component is methane.It is not only a kind of clean energy resource of preciousness, is also a kind of important industrial chemicals.China's device in Gas rich reserves is the third-largest reserves state after Russia, Canada in the world.But, China's device in Gas utilization rate is not high.For 2012, methane output 126.02 billion cubic meter, utilization rate was only 41.72%.At present, the device in Gas of utilization is mainly high concentration coal bed gas (methane concentration is between 80% ~ 98%), and it is used to civilian or industrial combustion gas; But most of low concentration gas gas is not utilized but directly to sky discharge, not only greatly exacerbates greenhouse effects and damage the ozone layer, but also causing huge hidden danger to the safety in production in colliery.
On January 21st, 2010, Work Safety Supervision Bureau of country has promulgated " decision about amendment (safety regulations in coal mine) part clause ", wherein according to the relevant criterion that the announced light concentration mash gas safety of national Work Safety Supervision Bureau utilizes, by in former " safety regulations in coal mine " about the regulation of " utilizing device in Gas; its methane concentration must not lower than 30% " be revised as " the mash gas methane concentration of extraction lower than 30% time, must not directly as fuel gas buring; During for internal combustion engine generating or as other purposes, utilization, the conveying of gas by the regulation of related standards, and must formulate technical safety measures "; This regulation eliminates the restriction utilized low concentration gas gas, and the utilization of low concentration gas gas will become the emphasis of device in Gas utilization.And it is high to there is equipment investment cost in the utilization of low concentration gas gas, complex process, and tapping rate is low, the defects such as period of cost recovery is long.
Summary of the invention
Technical problem to be solved by this invention is the situation for prior art, provides a kind of and is applicable to methane concentration 20% ~ 40% and the low concentration gas gas liquefaction devices and methods therefor of better economic benefit.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of low concentration gas gas liquefaction device, and comprise booster compressor, the front end of this booster compressor arranges purifier; The rear end of described booster compressor is connected with dewater unit by gas-liquid separator; It is characterized in that: the rear end of described dewater unit connects concentration unit, the rear end of this concentration unit is connected with high-pressure spray liquefying plant by associating compressor.
In order to ensure the security of low concentration gas gas in pressurization, described booster compressor is water spray helical-lobe compressor.
The rear end of described high-pressure spray liquefying plant is provided with the muffler device in Gas be not liquefied being back to associating compressor inlet; The device in Gas be not liquefied is back to associating compressor by return duct and constantly circulates and compress and liquefy.
The rear end of described high-pressure spray liquefying plant connects fluid reservoir.
Described concentration unit comprises one-level concentration unit, secondary concentration unit and three grades of concentration units.
The front end of described purifier arranges fire retardant device.When source of the gas or device are blasted, fire retardant device can stop spreading of flame, the safety of protective device or source of the gas.
The present invention adopts supercharging, pressure-changed adsorption concentrating device and high-pressure spray liquefying plant to produce liquefied natural gas, be applicable to the concentrate liquefaction of 20% ~ 40% low concentration gas gas, and this covering device cost of investment is few, fluid is fast, main dynamic equipment only has booster compressor and associating two, compressor, convenient later maintenance, operating cost is low; There is higher economic benefit.
A kind of low concentration gas gas liquefaction method, its concrete steps are as follows:
(1) process for purifying: gas unstripped gas enters purifier and carries out dedusting, the dust in removing gas unstripped gas;
(2) pressurizing processes: the gas unstripped gas through purification is carried out supercharging by booster compressor, is pressurized to 0.4 ~ 0.6MPa; Enter gas-liquid separator after supercharging and carry out gas-liquid separation;
(3) dewatering process: enter dewater unit through the gas unstripped gas of supercharging and gas-liquid separation and carry out deep dehydration;
(4) extracting and concentrating technology: by through deep dehydration methane concentration be 20% ~ 40% gas unstripped gas by concentration unit concentrate to 95% more than;
(5) liquefaction process: the gas unstripped gas through concentration unit concentrate to 95% methane concentration enters associating compressor compresses to 20 ~ 25MPa; Enter the high-pressure spray liquefying plant degree of depth again and be cooled to less than-120 DEG C, the LNG storage of output is to fluid reservoir, and the entrance that the device in Gas be not liquefied is back to associating compressor carries out circulation and compresses and liquefies.
In order to ensure the security of low concentration gas gas in pressurization, described booster compressor is water spray helical-lobe compressor.
Gas unstripped gas is dried to pressure leak source-2 DEG C ~ 10 DEG C by described dewater unit.
Described concentration unit comprises one-level concentration unit, secondary concentration unit and three grades of concentration units, and one-level concentration unit is by gas unstripped gas concentrate to 60% ~ 63% of methane concentration 20% ~ 40%; Secondary concentration unit is by device in Gas concentrate to 82% ~ 85% after one-level concentrate; Three grades of concentration units are by more than the device in Gas concentrate to 95% after secondary concentrate.
Low concentration gas gas liquefaction method of the present invention adopts purification, supercharging, concentrate and high-pressure spray liquefaction process, this process is simple, instant effect has very high economic benefit, and is applicable to 20% ~ 40% low concentration gas gas, extends the scope that device in Gas utilizes.
Accompanying drawing explanation
Fig. 1 is structure chart of the present invention;
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Fig. 1 illustrates an embodiment of the invention, and it comprises booster compressor 5, and the front end of this booster compressor 5 arranges purifier 4; The rear end of described booster compressor 5 is connected with dewater unit 7 by rearmounted gas-liquid separator 6.The front end of described purifier 4 is connected with fire retardant device 3.
The gas unstripped gas 1 come from colliery enters purifier 4 by fire retardant device 3; This purifier 4 is used for removing the dust in gas unstripped gas 1; When device is blasted, fire retardant device 3 can stop propagation of flame.Enter booster compressor 5 through the gas unstripped gas of purified treatment and be pressurized to 0.4 ~ 0.6MPa.This booster compressor 5 is water spray helical-lobe compressor; The import of water spray helical-lobe compressor sprays into a certain amount of water and can guarantee the security of device in Gas in pressurization.The outlet of booster compressor 5 connects gas-liquid separator 6, and this gas-liquid separator 6 is used for divided gas flow and liquid.Gas unstripped gas 1 after gas-liquid separation enters dewater unit 7 and carries out deep dehydration, and this dewater unit 7 dehydrating effect can reach pressure leak source-2 DEG C ~ 10 DEG C.
The rear end of described dewater unit 7 connects concentration unit 20, and this concentration unit comprises one-level concentration unit 8, secondary concentration unit 9 and three grades of concentration units 10; One-level concentration unit 8, secondary concentration unit 9 and three grades of concentration units 10 all adopt pressure swing adsorption technique.One-level concentration unit 8 is by gas unstripped gas concentrate to 60% ~ 63% of methane concentration 20% ~ 40%; Secondary concentration unit 9 is by device in Gas concentrate to 82% ~ 85% after one-level concentrate; Three grades of concentration units 10 are by more than the device in Gas concentrate to 95% after secondary concentrate.
Described concentration unit 20 rear end connects associating compressor 11, and the high concentration gas gas after concentrate is pressurized to 20 ~ 25MPa by this associating compressor 11.The rear end of associating compressor 11 connects high-pressure spray liquefying plant 12; The rear end of this high-pressure spray liquefying plant 12 connects fluid reservoir 13, and described high-pressure spray liquefying plant 12 is also provided with the muffler 14 device in Gas that is not liquefied being back to associating compressor 11 import.High pressrue jet apparatus utilizes the throttling expansion principle of high-pressure spray device, by secondary or three grades of high-pressure spray devices by the device in Gas throttling expansion of 20 ~ 25MPa to about 0.5MPa, device in Gas can be chilled to less than-120 DEG C, output liquefied natural gas; LNG storage is to fluid reservoir 13, and the import that the device in Gas be not liquefied is back to associating compressor 11 constantly circulates and compresses and liquefies.
The present invention adopts supercharging, pressure-changed adsorption concentrating device and high-pressure spray liquefying plant to produce liquefied natural gas, and can be applicable to the concentrate liquefaction of 20% ~ 40% low concentration gas gas, and this covering device cost of investment is little, fluid is fast, and maintenance cost is low; There is very high economic benefit.
Be described in detail below in conjunction with the embodiment of said apparatus to low concentration gas gas liquefaction method of the present invention.
A kind of low concentration gas gas liquefaction method, its concrete steps are as follows:
(1) process for purifying: gas unstripped gas 1 enters purifier 4 and carries out dedusting, the dust in removing gas unstripped gas;
(2) pressurizing processes: the gas unstripped gas through purification is carried out supercharging by booster compressor 5, is pressurized to 0.4 ~ 0.6MPa; Described booster compressor 5 is preferably sprayed water helical-lobe compressor; Enter gas-liquid separator 6 after supercharging and carry out gas-liquid separation;
(3) dewatering process: the gas unstripped gas through supercharging and gas-liquid separation enters dewater unit 7, and gas unstripped gas is dried to pressure leak source-2 DEG C ~ 10 DEG C;
(4) extracting and concentrating technology: by through deep dehydration methane concentration be 20% ~ 40% gas unstripped gas by concentration unit concentrate to 95% more than; This concentration unit 20 is three grades of pressure-swing absorption apparatus, and one-level concentration unit 8 is by gas unstripped gas concentrate to 60% ~ 63% of methane concentration 20% ~ 40%; Secondary concentration unit 9 is by device in Gas concentrate to 82% ~ 85% after one-level concentrate; Three grades of concentration units 10 are by more than the device in Gas concentrate to 95% after secondary concentrate;
(5) liquefaction process: the gas unstripped gas through concentration unit 20 concentrate to 95% methane concentration enters associating compressor compresses to 20 ~ 25MPa; Enter high-pressure spray liquefying plant 12 degree of depth again and be cooled to less than-120 DEG C, the LNG storage of output is to fluid reservoir 13, and the entrance that the device in Gas be not liquefied is back to associating compressor carries out circulation liquefaction.
Low concentration gas gas liquefaction method of the present invention adopts concentrate and high-pressure spray liquefaction process, and this process is simple, and output has very high economic benefit soon, and is applicable to 20% ~ 40% low concentration gas gas, extends the scope that device in Gas utilizes.
Claims (10)
1. a low concentration gas gas liquefaction device, comprises booster compressor (5), and the front end of this booster compressor (5) arranges purifier (4); The rear end of described booster compressor (5) is connected with dewater unit (7) by gas-liquid separator (6); It is characterized in that: the rear end of described dewater unit (7) connects concentration unit (20), the rear end of this concentration unit (20) is connected with high-pressure spray liquefying plant (12) by associating compressor (11).
2. low concentration gas gas liquefaction device according to claim 1, is characterized in that: described booster compressor (5) is water spray helical-lobe compressor.
3. low concentration gas gas liquefaction device according to claim 1 and 2, is characterized in that: the rear end of described high-pressure spray liquefying plant (12) is provided with the muffler (14) device in Gas be not liquefied being back to associating compressor (11) import.
4. low concentration gas gas liquefaction device according to claim 3, is characterized in that: the rear end of described high-pressure spray liquefying plant (12) connects fluid reservoir (13).
5. low concentration gas gas liquefaction device according to claim 4, is characterized in that: described concentration unit (20) comprises one-level concentration unit (8), secondary concentration unit (9) and three grades of concentration units (10).
6. low concentration gas gas liquefaction device according to claim 5, is characterized in that: the front end of described purifier (4) arranges fire retardant device (3).
7. a low concentration gas gas liquefaction method, its concrete steps are as follows:
(1) process for purifying: gas unstripped gas (1) enters purifier (4) and carries out dedusting, the dust in removing gas unstripped gas;
(2) pressurizing processes: the gas unstripped gas through purification is carried out supercharging by booster compressor (5), is pressurized to 0.4 ~ 0.6MPa; Enter gas-liquid separator (6) after supercharging and carry out gas-liquid separation;
(3) dewatering process: enter dewater unit (7) through the gas unstripped gas of supercharging and gas-liquid separation and carry out deep dehydration;
(4) extracting and concentrating technology: will be that the gas unstripped gas of 20% ~ 40% is by more than concentration unit (20) concentrate to 95% through deep dehydration methane concentration;
(5) liquefaction process: the gas unstripped gas through concentration unit (20) concentrate to 95% methane concentration enters associating compressor (11) and is compressed to 20 ~ 25MPa; Enter high-pressure spray liquefying plant (12) degree of depth again and be cooled to less than-120 DEG C, the LNG storage of output is to fluid reservoir (13), and the entrance that the device in Gas be not liquefied is back to associating compressor (11) carries out circulation and compresses and liquefies.
8. low concentration gas gas liquefaction method according to claim 7, is characterized in that: described booster compressor (5) is water spray helical-lobe compressor.
9. low concentration gas gas liquefaction method according to claim 7, is characterized in that: gas unstripped gas is dried to pressure leak source-2 DEG C ~ 10 DEG C by described dewater unit (7).
10. low concentration gas gas liquefaction method according to claim 7, it is characterized in that: described concentration unit (20) comprises one-level concentration unit (8), secondary concentration unit (9) and three grades of concentration units (10), and described one-level concentration unit (8) is by gas unstripped gas concentrate to 60% ~ 63% of methane concentration 20% ~ 40%; Described secondary concentration unit (9) is by device in Gas concentrate to 82% ~ 85% after one-level concentrate; Described three grades of concentration units (10) are by more than the device in Gas concentrate to 95% after secondary concentrate.
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| CN201510660931.9A CN105202866A (en) | 2015-10-12 | 2015-10-12 | Low-concentration gas liquefying device and method thereof |
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| CN201510660931.9A CN105202866A (en) | 2015-10-12 | 2015-10-12 | Low-concentration gas liquefying device and method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105698486A (en) * | 2016-04-07 | 2016-06-22 | 重庆鲍斯可燃气工程有限公司 | Gas cryogenic liquefying system |
| US11460244B2 (en) | 2016-06-30 | 2022-10-04 | Baker Hughes Oilfield Operations Llc | System and method for producing liquefied natural gas |
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Patent Citations (7)
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| KR20020051315A (en) * | 2000-12-22 | 2002-06-29 | 이구택 | A preparing method of argon gas with high purity |
| CN101135506A (en) * | 2007-10-10 | 2008-03-05 | 中国船舶重工集团公司第七一一研究所 | Middle and small mixed working substance natural gas liquefaction cooling cycle system with injector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105698486A (en) * | 2016-04-07 | 2016-06-22 | 重庆鲍斯可燃气工程有限公司 | Gas cryogenic liquefying system |
| CN105698486B (en) * | 2016-04-07 | 2017-11-10 | 重庆鲍斯可燃气工程有限公司 | A kind of gas cryogenic liquefying system |
| US11460244B2 (en) | 2016-06-30 | 2022-10-04 | Baker Hughes Oilfield Operations Llc | System and method for producing liquefied natural gas |
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Application publication date: 20151230 |