CN102538389A - Mixed refrigerant pre-cooling system applied to base-load natural gas liquefaction plant - Google Patents
Mixed refrigerant pre-cooling system applied to base-load natural gas liquefaction plant Download PDFInfo
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- CN102538389A CN102538389A CN2011104278099A CN201110427809A CN102538389A CN 102538389 A CN102538389 A CN 102538389A CN 2011104278099 A CN2011104278099 A CN 2011104278099A CN 201110427809 A CN201110427809 A CN 201110427809A CN 102538389 A CN102538389 A CN 102538389A
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Abstract
The invention discloses a mixed refrigerant pre-cooling system applied to a base-load natural gas liquefaction plant, which comprises a cold box, a first compression mechanism, a second compression mechanism, a third compression mechanism and a throttle mechanism and can be suitable for the base-load natural gas liquefaction plant with annual yield liquefied natural gas (LNG) as 500,000-5000,000 tons. The mixed refrigerant pre-cooling system supplies cold energy to qualified natural gas passing preprocessing and copious cooling mixed refrigerants, and cools the natural gas and the mixed refrigerants to the target pre-cooling temperature. The qualified natural gas passing preprocessing after desulfuration, decarbonization, mercury removal and dehydration meets quality requirements for the natural gas entering a liquefaction unit of the base-load natural gas liquefaction plant. The adjusting range of the pre-cooling temperature that the pre-cooling system can provide is from -35 DEGC to -60 DEG C. The mixed refrigerant pre-cooling system is wide in adjustment range of the pre-cooling temperature, low in energy consumption, simple in flow path and easy to control and manufacture, and the pre-cooling system has strong adaptability to natural gas components.
Description
Technical field
The present invention relates to a kind of mix refrigerant chilldown system that is applied to basic lotus type natural gas liquefaction plant, the natural gas liquefaction technical field.
Background technology
Large-scale natural gas liquefaction device mainly adopts propane precooling and mix refrigerant precooling technology at present.Adopt the precooling technology of propane influenced by the propane rerum natura, precooling temperature can not be lower than-38 ℃, and is relatively poor to the adaptability of environment temperature and natural gas, and the heat exchanger quantity of propane chilldown system is more, system complex; The technological process of more representational in the world employing mix refrigerant precooling at present be Shell company DMR technology and the Liquefin technology of Axens company; Reason owing to selected mix refrigerant component; Need to adopt multi-level throttle, make the difficulty of operation and control increase.
Summary of the invention
The purpose of this invention is to provide a kind of mix refrigerant chilldown system that is applied to basic lotus type natural gas liquefaction plant.
A kind of mix refrigerant chilldown system that is applied to basic lotus type natural gas liquefaction plant provided by the invention comprises ice chest, first compressing mechanism, second compressing mechanism, the 3rd compressing mechanism and throttle mechanism;
Said first compressing mechanism comprises surge tank a, first compressor and first cooler that connects successively, and the inlet of said surge tank is connected with said ice chest, and the top of said ice chest is located in this junction;
Said second compressing mechanism comprises gas-liquid separator a and exports second compressor and the liquid pump a that is connected with the gaseous phase outlet of this gas-liquid separator a with liquid phase respectively that the outlet of said second compressor and liquid pump a all is connected with second cooler; The outlet of said first cooler is connected with the inlet of said gas-liquid separator a;
Said the 3rd compressing mechanism comprises gas-liquid separator b and exports the 3rd compressor and the liquid pump b that is connected with the gaseous phase outlet of this gas-liquid separator b with liquid phase respectively that the outlet of said the 3rd compressor and liquid pump b all is connected with the 3rd cooler; The outlet of said second cooler is connected with the inlet of said gas-liquid separator b;
The outlet of said the 3rd cooler is connected with surge tank b, and the outlet of said surge tank b is connected with said ice chest, and the top of said ice chest is located in this connection place;
Said throttle mechanism comprises choke valve and the gas-liquid separator c that connects successively, and the inlet of said choke valve all is connected with said ice chest with gaseous phase outlet and the liquid phase outlet of said gas-liquid separator c, and the bottom of said ice chest all is located in this connection place.
In the above-mentioned mix refrigerant chilldown system, be provided with plate-fin heat exchanger in the said ice chest.
Mix refrigerant chilldown system provided by the invention is applicable to producing the basic lotus type natural gas liquefaction plant of LNG scale ten thousand tons of 50-500 per year, and natural gas and the deep cooling mix refrigerant qualified for preliminary treatment provide cold, and it is cooled to the target precooling temperature; The preliminary treatment sales-quality gas is meant through satisfying basic lotus type natural gas liquefaction plant after desulfurization, decarburization, demercuration, the dehydration to getting into the quality requirement of liquefaction unit natural gas; The adjusting orientation of the available precooling temperature of this chilldown system is-35 ℃～-60 ℃; When using mix refrigerant chilldown system provided by the invention, mix refrigerant can be selected ethene, propane and isopentane for use.
The precooling temperature adjustable range of mix refrigerant chilldown system provided by the invention is wide, energy consumption is low, and gas component is had stronger adaptability, and flow process is simple simultaneously, control operation is easy, energy consumption is low.
Description of drawings
Fig. 1 is the structural representation of mix refrigerant chilldown system provided by the invention.
Each parts is following among the figure: 1 ice chest, 2 surge tank a, 3 first compressors, 4 first coolers, 5 gas-liquid separator a, 6 second coolers, 7 liquid pump a, 8 second coolers, 9 gas-liquid separator b, 10 the 3rd compressors, 11 liquid pump b, 12 the 3rd coolers, 13 surge tank b, 14 choke valves, 15 gas-liquid separator c, 16 pipeline a, 17 pipeline b, 18 pipeline c, 19 pipeline d.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described further, but the present invention is not limited to following examples.
Mix refrigerant chilldown system provided by the invention comprises ice chest 1, first compressing mechanism, second compressing mechanism, the 3rd compressing mechanism and throttle mechanism; Be provided with plate-fin heat exchanger in the ice chest 1; First compressing mechanism comprises surge tank a2, first compressor 3 and first cooler 4 that connects successively, and the inlet of surge tank a2 is connected with ice chest 1, and the top of ice chest 1 is located in this connection place; Second compressing mechanism comprises gas-liquid separator a5 and second compressor 6 and liquid pump a7 that is connected with gaseous phase outlet and the liquid phase outlet of this gas-liquid separator a5 respectively, and the outlet of second compressor 6 and liquid pump a7 all is connected with the inlet of second cooler 8; The outlet of first cooler 4 is connected with the inlet of gas-liquid separator a5; The 3rd compressing mechanism comprises gas-liquid separator b9 and the 3rd compressor 10 and liquid pump b11 that is connected with gaseous phase outlet and the liquid phase outlet of this gas-liquid separator b9 respectively, and the outlet of the 3rd compressor 10 and liquid pump b11 all is connected with the inlet of the 3rd cooler 12; The outlet of second cooler 8 is connected with the inlet of gas-liquid separator b9; The outlet of the 3rd cooler 12 is connected with surge tank b13, and the outlet of this surge tank b13 is connected with ice chest 1, and the top of ice chest 1 is located in this connection place; Throttle mechanism comprises the choke valve 14 and gas-liquid separator c15 that connects successively, and the inlet of this choke valve 14 is connected with ice chest 1, and the gaseous phase outlet of gas-liquid separator c15 and liquid phase outlet all are connected with ice chest 1, and the bottom of ice chest 1 all is located in above-mentioned connection place.
Use above-mentioned mix refrigerant chilldown system that the raw natural gas and the deep cooling mix refrigerant in gas field, the Persian Gulf are carried out precooling to extremely-50 ℃; Feed gas composition is 93.5% methane, 2.46% ethene, 3.1% nitrogen; 0.51% propane; Butane 0.13%, iso-butane 0.12%, C5+ component 0.18%; The mix refrigerant that adopts is made up of 35% ethene, 45% propane, 20% isopentane, can carry out according to following step:
The pressure of the arrival end mix refrigerant of surge tank a2 is 270kPa, and temperature is 35 ℃, and through carrying out first section compression behind the surge tank a2, the pressure of compression back mix refrigerant is 850kPa, and temperature is 83.5 ℃, gets into then in first cooler 4 and is cooled to 38 ℃; Cooled mix refrigerant is the gas-liquid two-phase state; Through the second section compression of the gas phase mix refrigerant after the knockout drum a5 separation through second compressor 6; The pressure of compression back mix refrigerant is 1750kPa; The mix refrigerant after liquid pressurizes through liquid pump 7 and the gas of second compressor, 6 outlets are mixed in second cooler 8; The gas-liquid two-phase mix refrigerant that is cooled to 38 ℃ gets into gas-liquid separator b9 again, and the gas mix refrigerant gets into the 3rd compressor 10, and the azeotrope pressure after the compression is 3350kPa; Liquid mixing cryogen 213 is through liquid pump b11 supercharging; Liquid-phase mixing cryogen after the supercharging mixes with the gas of the 3rd compressor 10 outlets, and mixed two phase refrigerant gets into and is condensed into 38 ℃ liquid-phase mixing cryogen in the 3rd cooler 12, becomes high pressure liquid through condensation and mixes cold cold-producing medium entering surge tank b13 mutually; High pressure liquid phase mix refrigerant gets into the plate-fin heat exchanger in the ice chest 1 from top to bottom, and the high pressure low temperature mix refrigerant that flows out in the plate-fin heat exchanger bottom gets into choke valve 14, is depressured to 330KPa; Low pressure mix refrigerant temperature after the throttling is-53.25 ℃; Be two phase states this moment, is evenly distributed in order to guarantee anti-stream in the plate-fin heat exchanger of azeotrope in ice chest 1, and gas-liquid separator c15 need be set; Low-pressure vapor phase mix refrigerant after separating and low pressure liquid-phase mixing cold-producing medium flow into ice chest 1 respectively from the bottom; Flow through plate-fin heat exchanger from bottom to top after in ice chest 1 runner, mixing, for heat exchanger provides cold, temperature is heated to normal temperature behind the low pressure mix refrigerant released cold quantity that flows out from ice chest 1 top; Get into surge tank a2 again, promptly accomplish a closed cycle.
Raw natural gas and deep cooling mix refrigerant be the different runners of a16 and pipeline c18 entering heat exchanger by the road respectively; The precooling plate-fin heat exchanger of flowing through from top to bottom then; Natural gas and high pressure mixing refrigerant temperature through after the precooling are all reduced to-50 ℃, and other technology outflow of b17 and pipeline d19 entering is by the road further cooled off respectively then.
Claims (2)
1. mix refrigerant chilldown system that is applied to basic lotus type natural gas liquefaction plant, it is characterized in that: said chilldown system comprises ice chest, first compressing mechanism, second compressing mechanism, the 3rd compressing mechanism and throttle mechanism;
Said first compressing mechanism comprises surge tank a, first compressor and first cooler that connects successively, and the inlet of said surge tank is connected with said ice chest, and the top of said ice chest is located in this junction;
Said second compressing mechanism comprises gas-liquid separator a and exports second compressor and the liquid pump a that is connected with the gaseous phase outlet of this gas-liquid separator a with liquid phase respectively that the outlet of said second compressor and liquid pump a all is connected with second cooler; The outlet of said first cooler is connected with the inlet of said gas-liquid separator a;
Said the 3rd compressing mechanism comprises gas-liquid separator b and exports the 3rd compressor and the liquid pump b that is connected with the gaseous phase outlet of this gas-liquid separator b with liquid phase respectively that the outlet of said the 3rd compressor and liquid pump b all is connected with the 3rd cooler; The outlet of said second cooler is connected with the inlet of said gas-liquid separator b;
The outlet of said the 3rd cooler is connected with surge tank b, and the outlet of said surge tank b is connected with said ice chest, and the top of said ice chest is located in this connection place;
Said throttle mechanism comprises choke valve and the gas-liquid separator c that connects successively, and the inlet of said choke valve all is connected with said ice chest with gaseous phase outlet and the liquid phase outlet of said gas-liquid separator c, and the bottom of said ice chest all is located in this connection place.
2. mix refrigerant chilldown system according to claim 1 is characterized in that: be provided with plate-fin heat exchanger in the said ice chest.
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| CN2011104278099A CN102538389A (en) | 2011-12-19 | 2011-12-19 | Mixed refrigerant pre-cooling system applied to base-load natural gas liquefaction plant |
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| CN2011104278099A CN102538389A (en) | 2011-12-19 | 2011-12-19 | Mixed refrigerant pre-cooling system applied to base-load natural gas liquefaction plant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245149A (en) * | 2013-05-23 | 2013-08-14 | 重庆耐德能源装备集成有限公司 | Mixed refrigerant circulation liquefied natural gas device and mixed refrigerant recovery device |
| CN113532020A (en) * | 2021-07-28 | 2021-10-22 | 重庆天原化工有限公司 | Chloromethane compression system |
| CN114950014A (en) * | 2022-05-17 | 2022-08-30 | 浙江本源醇氢科技有限公司 | Membrane separation hydrogen purification device for skid-mounted methanol hydrogen production device |
| CN116518648A (en) * | 2023-05-08 | 2023-08-01 | 霍娟娟 | Liquefied petroleum gas separation treatment system and treatment process |
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| US3964891A (en) * | 1972-09-01 | 1976-06-22 | Heinrich Krieger | Process and arrangement for cooling fluids |
| US4303427A (en) * | 1976-06-23 | 1981-12-01 | Heinrich Krieger | Cascade multicomponent cooling method for liquefying natural gas |
| WO2000036350A2 (en) * | 1998-12-18 | 2000-06-22 | Exxonmobil Upstream Research Company | Dual refrigeration cycles for natural gas liquefaction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103245149A (en) * | 2013-05-23 | 2013-08-14 | 重庆耐德能源装备集成有限公司 | Mixed refrigerant circulation liquefied natural gas device and mixed refrigerant recovery device |
| CN113532020A (en) * | 2021-07-28 | 2021-10-22 | 重庆天原化工有限公司 | Chloromethane compression system |
| CN114950014A (en) * | 2022-05-17 | 2022-08-30 | 浙江本源醇氢科技有限公司 | Membrane separation hydrogen purification device for skid-mounted methanol hydrogen production device |
| CN116518648A (en) * | 2023-05-08 | 2023-08-01 | 霍娟娟 | Liquefied petroleum gas separation treatment system and treatment process |
| CN116518648B (en) * | 2023-05-08 | 2023-11-17 | 环西汀新材料(江苏)有限公司 | Liquefied petroleum gas separation treatment system and treatment process |
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Application publication date: 20120704 |