CN101805649A - Natural gas liquefaction process with lithium bromide precooling - Google Patents
Natural gas liquefaction process with lithium bromide precooling Download PDFInfo
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- CN101805649A CN101805649A CN201010128254A CN201010128254A CN101805649A CN 101805649 A CN101805649 A CN 101805649A CN 201010128254 A CN201010128254 A CN 201010128254A CN 201010128254 A CN201010128254 A CN 201010128254A CN 101805649 A CN101805649 A CN 101805649A
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- natural gas
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- lithium bromide
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Abstract
The invention relates to a natural gas liquefaction process with lithium bromide precooling. At present, the precooling mode frequently applied to natural gas liquefaction is a propane or Freon precooling mode, wherein the propane precooling mode has more complicated process form and more equipment than those of the Freon precooling mode; and a Freon compressor used in a Freon precooling process has poor reliability, and circulated precooling agent Freon is harmful to environment. The invention comprises the following steps of: preparing lithium bromide used as an absorbent in a cold water machine set into cooling medium water with the temperature of 5-7 DEG C by utilizing the principle of steam absorption; importing the cooling medium water into a precooling heat exchanger through a pipeline for precooling natural gas and a mixed refrigerant coming out of a refrigerant compressor to 9-11 DEG C, returning the cooling medium water heated to 4-6 DEG C to a lithium bromide cold water machine set for next-time circulation, respectively importing the precooled natural gas and the mixed refrigerant to a liquefaction ice tank through the pipeline, then changing the natural gas to liquefied natural gas to be outputted by the pipeline, and making the mixed refrigerant enter the refrigerant compressor through the pipeline after being cooled through the ice tank. The method of the invention is used for natural gas liquefaction.
Description
Technical field:
The present invention relates to a kind of natural gas liquefaction process with lithium bromide precooling.
Background technology:
Sweet natural gas is a kind of important energy source, because of the few clean energy that is called as of its environmental pollution.The volume of natural gas liquids (LNG) has only with 1/625 of amount gas volume, thereby after its liquefaction, can reduce and store and transportation cost, and can improve the combustion value of unit volume.Since last century, the application that the natural gas liquefaction flow process of various different types obtains is divided into following three kinds of modes with refrigeration modes: 1, cascade type liquefaction flow process; 2, mix refrigerant liquefaction flow path; 3, the liquefaction flow path of band decompressor.Along with developing rapidly of natural gas liquids chemical industry, this has higher requirement to the natural gas liquefaction technology, therefore selects which kind of liquefaction flow path mode, directly has influence on the economy of LNG factory construction and operation thereof.
For a LNG factory, select liquefaction flow path mainly to consider following factor: 1, flow scheme design is simple, equipment is few, cost is low; 2, energy consumption is low, can adapt to the variation of feed gas composition and atmospheric environment; 3, environmentally friendly; 4, equipment is chosen easily.Because of Sweet natural gas is a multicomponent mixture, the component more complicated, for characteristics such as the liquefaction flow path that makes design accomplish that energy consumption is low, environmentally safe, adaptability are strong, since the seventies in 20th century, various dissimilar natural gas liquefaction flow process modes have obtained using and improving.At present in the natural gas liquefaction flow scheme design, the hybrid refrigeration liquefaction flow path is used many, specific energy consumption is higher mutually but the mix refrigerant liquefaction flow path is with the cascade type liquefaction flow process, in order to cut down the consumption of energy, occurred the mix refrigerant liquefaction flow path of band precooling on this basis again, and obtained using widely.
Using more precooling mode at present is propane or freonll-11 precooling, and wherein the propane precooling is more more than freonll-11 precooling flow process complex forms, equipment; Propane or the used compressor reliability of freonll-11 precooling flow process are poor, and circulation precooling agent freonll-11 has harm to environment.
Summary of the invention:
The natural gas liquefaction process of the band lithium bromide precooling that the present invention proposes that a kind of technical process is simple, energy consumption is low, equipment is reliable, environment is safe from harm.
Above-mentioned purpose realizes by following technical scheme:
The natural gas liquefaction process of band lithium bromide precooling, its technological process is: handpiece Water Chilling Units is absorption agent with the lithiumbromide, utilize the principle of vapor absorption to make 5～7 ℃ chilled water, described chilled water is reached the mix refrigerant that comes out from coolant compressor by pipeline input precool heat exchanger device to Sweet natural gas be pre-chilled to 9-11 ℃, return the lithium bromide cooling-water machine group after 4-6 ℃ of the chilled water temperature rise circulates next time, import the liquefaction ice chest by pipeline respectively through Sweet natural gas after the precooling and mix refrigerant, Sweet natural gas becomes natural gas liquids to be exported by pipeline, and mix refrigerant enters coolant compressor from ice chest cooling back by pipeline.
Beneficial effect:
1. the present invention is provided with the precooling program, and what will use always be that the unit cooler of refrigeration agent changed into the lithiumbromide with propane or freonll-11 is the handpiece Water Chilling Units of absorption agent, make equipment reliable and stable, propane or freonll-11 precooling unit need use compressor, the motor-driven equipment of lithium bromide refrigerating has only 2 pumps, and the reliability of pump is considerably beyond compressor.
2. energy consumption and annual operating cost are low.Propane or the utilization of freonll-11 precooling unit be secondary energy, and the utilization of lithium bromide cooling-water machine group is primary energy source, the energy conversion rate height.
Economical efficiency is analyzed as follows:
| MR compressor shaft power kw | Precooling power consumption kw | Lithium bromide refrigerator Sweet natural gas consumption Nm 3/h | Power consumption kw | Working cost unit/hour | |
| No precooling | ??6.94 | ??6.9977 | ??3.8487 | ||
| The freonll-11 precooling | ??5.98 | ??0.6 | ??6.58 | ??3.619 | |
| Lithium bromide precooling | ??5.98 | ??0.1944 | ??5.98 | ??3.5573 |
Basis: liquefied natural gas (LNG)-throughput 1kmol/h, raw natural gas pressure 5.4Mpa, 0.55 yuan/kwh of electricity price, 1.38 yuan/cubic metre of gas prices, main heat exchanger integration temperature difference 7k.
With 30 * 10
4Sm
3/ dLNG device is an example, year operation 8000 hours, and annual operating cost is as follows:
| No precooling | The freonll-11 precooling | Lithium bromide precooling | |
| Working cost: unit/year | ??16,008,884 | ??15,053,434 | ??14,796,789 |
3. good to environment.The used precooling agent of freonll-11 precooling unit has pollution to atmospheric layer, does not meet environmental protection; And the used refrigeration agent of lithium bromide refrigerator is a water, and absorption agent is the lithiumbromide environmentally safe.
4. for northern area, when winter temperature was low, lithium bromide refrigerating water unit can be factory the heat supply of producing and live is provided, and saves plant investment.
Description of drawings:
Accompanying drawing 1 is a process flow sheet of the present invention.
Embodiment:
Embodiment 1:
The natural gas liquefaction process of band lithium bromide precooling, its technological process is: handpiece Water Chilling Units is absorption agent with the lithiumbromide, utilize the principle of vapor absorption to make 5～7 ℃ chilled water, described chilled water is reached the mix refrigerant that comes out from coolant compressor by pipeline input precool heat exchanger device to Sweet natural gas be pre-chilled to 9-11 ℃, return the lithium bromide cooling-water machine group after 4-6 ℃ of the chilled water temperature rise circulates next time, import the liquefaction ice chest by pipeline respectively through Sweet natural gas after the precooling and mix refrigerant, Sweet natural gas becomes natural gas liquids to be exported by pipeline, and mix refrigerant enters coolant compressor from ice chest cooling back by pipeline.
Claims (1)
1. natural gas liquefaction process with lithium bromide precooling, it is characterized in that: its technological process is: handpiece Water Chilling Units is absorption agent with the lithiumbromide, utilize the principle of vapor absorption to make 5～7 ℃ chilled water, described chilled water is reached the mix refrigerant that comes out from coolant compressor by pipeline input precool heat exchanger device to Sweet natural gas be pre-chilled to 9-11 ℃, return the lithium bromide cooling-water machine group after 4-6 ℃ of the chilled water temperature rise circulates next time, import the liquefaction ice chest by pipeline respectively through Sweet natural gas after the precooling and mix refrigerant, Sweet natural gas becomes natural gas liquids to be exported by pipeline, and mix refrigerant enters coolant compressor from ice chest cooling back by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010128254A CN101805649A (en) | 2010-03-19 | 2010-03-19 | Natural gas liquefaction process with lithium bromide precooling |
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| CN201010128254A CN101805649A (en) | 2010-03-19 | 2010-03-19 | Natural gas liquefaction process with lithium bromide precooling |
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| CN101805649A true CN101805649A (en) | 2010-08-18 |
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| CN201010128254A Pending CN101805649A (en) | 2010-03-19 | 2010-03-19 | Natural gas liquefaction process with lithium bromide precooling |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889752A (en) * | 2012-09-24 | 2013-01-23 | 瑞诺威（北京）工程技术有限公司 | Methane-rich gas liquefying device provided with ammonia absorption type refrigerator for precooling and methane-rich gas liquefying technology |
| CN103031170A (en) * | 2012-12-14 | 2013-04-10 | 贵州盘江煤层气开发利用有限责任公司 | Production method for concentrating low-concentration gas to prepare LNG (liquefied natural gas) |
| CN103574981A (en) * | 2012-07-20 | 2014-02-12 | 中国石油化工集团公司 | Framework system and method for preparing low-temperature refrigerant |
| CN106123486A (en) * | 2016-08-05 | 2016-11-16 | 成都赛普瑞兴科技有限公司 | The natural gas liquefaction being combined with distributed energy and system |
| CN106440656A (en) * | 2016-11-02 | 2017-02-22 | 中国寰球工程有限公司 | Natural gas liquefying system for carbon dioxide precooling double-stage nitrogen expansion |
| CN106500459A (en) * | 2016-10-28 | 2017-03-15 | 银川天佳能源科技股份有限公司 | A kind of mixed refrigeration process for being applied to natural gas cryogenic liquefying field |
| CN106500458A (en) * | 2016-11-03 | 2017-03-15 | 成都赛普瑞兴科技有限公司 | Pre-cooling type natural gas liquefaction process and system |
| CN108980618A (en) * | 2018-08-20 | 2018-12-11 | 中海石油气电集团有限责任公司 | A kind of chilldown system and method for LNG receiving station large diameter pipeline |
| US11624555B2 (en) | 2017-11-27 | 2023-04-11 | Air Products And Chemicals, Inc. | Method and system for cooling a hydrocarbon stream |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574981A (en) * | 2012-07-20 | 2014-02-12 | 中国石油化工集团公司 | Framework system and method for preparing low-temperature refrigerant |
| CN103574981B (en) * | 2012-07-20 | 2015-12-02 | 中国石油化工集团公司 | A kind of construction system and method preparing low temperature refrigerant |
| CN102889752B (en) * | 2012-09-24 | 2015-06-10 | 瑞诺威（北京）工程技术有限公司 | Methane-rich gas liquefying device provided with ammonia absorption type refrigerator for precooling and methane-rich gas liquefying technology |
| CN102889752A (en) * | 2012-09-24 | 2013-01-23 | 瑞诺威（北京）工程技术有限公司 | Methane-rich gas liquefying device provided with ammonia absorption type refrigerator for precooling and methane-rich gas liquefying technology |
| CN103031170A (en) * | 2012-12-14 | 2013-04-10 | 贵州盘江煤层气开发利用有限责任公司 | Production method for concentrating low-concentration gas to prepare LNG (liquefied natural gas) |
| CN106123486A (en) * | 2016-08-05 | 2016-11-16 | 成都赛普瑞兴科技有限公司 | The natural gas liquefaction being combined with distributed energy and system |
| CN106500459B (en) * | 2016-10-28 | 2019-07-30 | 宁夏凯添燃气发展股份有限公司 | A kind of hybrid refrigeration process applied to natural gas cryogenic liquefying field |
| CN106500459A (en) * | 2016-10-28 | 2017-03-15 | 银川天佳能源科技股份有限公司 | A kind of mixed refrigeration process for being applied to natural gas cryogenic liquefying field |
| CN106440656A (en) * | 2016-11-02 | 2017-02-22 | 中国寰球工程有限公司 | Natural gas liquefying system for carbon dioxide precooling double-stage nitrogen expansion |
| CN106440656B (en) * | 2016-11-02 | 2022-02-15 | 中国寰球工程有限公司 | Carbon dioxide precooling two-stage nitrogen expansion natural gas liquefaction system |
| CN106500458A (en) * | 2016-11-03 | 2017-03-15 | 成都赛普瑞兴科技有限公司 | Pre-cooling type natural gas liquefaction process and system |
| US11624555B2 (en) | 2017-11-27 | 2023-04-11 | Air Products And Chemicals, Inc. | Method and system for cooling a hydrocarbon stream |
| CN108980618A (en) * | 2018-08-20 | 2018-12-11 | 中海石油气电集团有限责任公司 | A kind of chilldown system and method for LNG receiving station large diameter pipeline |
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Application publication date: 20100818 |