CN101838568A - Natural gas liquefaction process by utilizing night electricity - Google Patents

Natural gas liquefaction process by utilizing night electricity Download PDF

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Publication number
CN101838568A
CN101838568A CN201010116744A CN201010116744A CN101838568A CN 101838568 A CN101838568 A CN 101838568A CN 201010116744 A CN201010116744 A CN 201010116744A CN 201010116744 A CN201010116744 A CN 201010116744A CN 101838568 A CN101838568 A CN 101838568A
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China
Prior art keywords
water
natural gas
temperature
normal
pipeline
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Application number
CN201010116744A
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Chinese (zh)
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CN101838568B (en
Inventor
赵德泉
杨光达
于艳君
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LIAONING CIMC HASHENLENG GAS LIQUEFACTION EQUIPMENT CO., LTD.
Original Assignee
HARBIN CYOGENIC GASES LIQUEFYING EQUIPMENT CO Ltd
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Priority to CN 201010116744 priority Critical patent/CN101838568B/en
Publication of CN101838568A publication Critical patent/CN101838568A/en
Application granted granted Critical
Publication of CN101838568B publication Critical patent/CN101838568B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a natural gas liquefaction process by utilizing night electricity. A refrigeration technology which utilizes cheap night electricity requires a larger cold accumulation space and more cold accumulation materials, and one-time investment is large, thus limiting the application. The process is as follows: normal-temperature water which is accumulated in a normal-temperature pool when electricity is not expensive at night is sucked by a normal-temperature water pump through a pipeline (1) to enter a water chiller unit through a pipeline (2), in the water chiller unit, after being cooled from the normal temperature, the normal-temperature water as chilled water enters a low-temperature pool through a pipeline (3), and low-temperature water required by continuous operation of a natural gas liquefaction device enters a low-temperature water pump through a pipeline (4) and is then transported into the natural gas liquefaction device through a pipeline (5) to be pre-cooled; redundant low-temperature water is accumulated in the low-temperature pool; and after being heated to the normal temperature in the natural gas liquefaction device, the low-temperature water flows to the normal-temperature pool through a pipeline (6), the normal-temperature water pump and the water chiller unit are started when the electricity is not expensive to make the low-temperature water, and the cycle is repeated. The method is applied to natural gas liquefaction.

Description

Utilize the natural gas liquefaction process of night electricity
Technical field:
The present invention relates to a kind of natural gas liquefaction process that utilizes night electricity.
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, power consumption constantly reduces, and the potentiality of energy-saving and cost-reducing aspect are more and more littler.And the electricity charge account for total production cost more than 70% in the natural gas liquids tooling cost.All adopt by the time disjunction with different electricity price charging ways in most areas in the world wide, and the electricity charge at night are very cheap.Utilize night cheap some equipment of power start to produce unnecessary cold and store, again this part cold is discharged the purpose that reduces the operation electricity charge to reach when the electricity charge are higher in the daytime.Utilize the Refrigeration Technique of cheap electric power at night to require that bigger cold-storage space and more cool storage material are arranged, its one-time investment is bigger, thereby has limited its application.
Summary of the invention:
The present invention proposes a kind of natural gas liquefaction process good reliability of utilizing night electricity, investment is little, working cost is low.
Above-mentioned purpose realizes by following technical scheme:
Utilize the natural gas liquefaction process of night electricity, being accumulated in normal-temperature water in the normal temperature pond night during trough electricity price is sucked by the normal temperature water pump from pipeline (1) and enters handpiece Water Chilling Units by pipeline (2), normal-temperature water enters low temperature pond as chilled water through pipeline (3) by the normal temperature back that is cooled in handpiece Water Chilling Units, and natural gas liquefaction device moves required water at low temperature continuously and enters low temperature water pump through pipeline (4) and carry out precooling after pipeline (5) is transported to natural gas liquefaction device; Unnecessary water at low temperature is accumulated in the low temperature pond; Water at low temperature is flow in the normal temperature pond by pipeline (6) be heated to normal temperature in natural gas liquefaction device after, and startup normal temperature water pump and handpiece Water Chilling Units are produced water at low temperature during the trough electricity price, so circulation.
The described natural gas liquefaction process that utilizes night electricity, the chilled water that described handpiece Water Chilling Units provides is the water at low temperature more than 0 ℃, or having added 0 ℃~-35 ℃ later deep hypothermia water of frostproofer, described two pool volumes depend on the trough electricity price time length.
The described natural gas liquefaction process that utilizes night electricity, described frostproofer are ethylene glycol or calcium chloride.
Beneficial effect of the present invention:
1. handpiece Water Chilling Units of the present invention was worked during the trough electricity price at night, shut down when par and crest electricity price, and the water at low temperature that work schedule is got is except that feeding mechanism, and unnecessary cold water is stored in the low temperature pond.When handpiece Water Chilling Units is shut down again with the Cold water supply liquefying plant of accumulating in the low temperature pond.The normal-temperature water that is heated by device flows in the normal temperature pond to be accumulated.The handpiece Water Chilling Units on period is given handpiece Water Chilling Units with normal-temperature water with the normal-temperature water pump delivery again.
The invention solves other and utilize the bigger shortcoming of cheap electric refrigeration flow process investment at night.
2. the ingenious characteristics of having utilized natural gas liquefaction plant to be equipped with fire-water pond of the present invention, but two water reservoir double as fire-water ponds of increase or not investment and floor space in addition, have not only utilized night cheap electric power to reduce working cost but also do not increase too many.Economic benefit of investment is analyzed as follows:
Circularly cooling compressor shaft power kw Precooling power kw Working time every day h Installed capacity kw Working cost unit/sky Power consumption kwh/Nm 3
Conventional precooling ??856.7 ??178 ??24 ??1034.7 ??14900 ??0.248
Night electricity ??856.7 ??544 Wherein handpiece Water Chilling Units 8 ??1400.7 ??13207 ??0.22
Annotate: power consumption is meant the unit consumption when adopting the expense conversion of saving after the night electricity technology to be the reduction power consumption.
Basis:
1.LNG output 186kmol/h (side's every days 100,000), raw natural gas pressure 5.0Mpa;
2. electricity price: 0.6 yuan/kwh of average price, every day 22 is up to 0.2 yuan of paddy electricity price early 6 o'clock next day.
Description of drawings:
Accompanying drawing 1 is a process flow sheet of the present invention.
Embodiment:
Embodiment 1:
Utilize the natural gas liquefaction process of night electricity, being accumulated in normal-temperature water in the normal temperature pond night during trough electricity price is sucked by the normal temperature water pump from pipeline 1 and enters handpiece Water Chilling Units by pipeline 2, normal-temperature water enters low temperature pond as chilled water through pipeline 3 by the normal temperature back that is cooled in handpiece Water Chilling Units, and natural gas liquefaction device moves required water at low temperature continuously and enters low temperature water pump through pipeline 4 and carry out precooling after pipeline 5 is transported to natural gas liquefaction device; Unnecessary water at low temperature is accumulated in the low temperature pond; Water at low temperature is flow in the normal temperature pond by pipeline 6 be heated to normal temperature in natural gas liquefaction device after, and startup normal temperature water pump and handpiece Water Chilling Units are produced water at low temperature during the trough electricity price, so circulation.
Embodiment 2:
The embodiment 1 described natural gas liquefaction process that utilizes night electricity, the chilled water that described handpiece Water Chilling Units provides is the water at low temperature more than 0 ℃, or added after the frostproofer even at-35 ℃ of also uncongealable deep hypothermia water, described two pool volumes depend on the trough electricity price time length.
Described frostproofer is ethylene glycol or calcium chloride.

Claims (3)

1. natural gas liquefaction process that utilizes night electricity, it is characterized in that: be accumulated in normal-temperature water in the normal temperature pond night during trough electricity price and suck by the normal temperature water pump from pipeline (1) and enter handpiece Water Chilling Units by pipeline (2), normal-temperature water enters low temperature pond as chilled water through pipeline (3) by the normal temperature back that is cooled in handpiece Water Chilling Units, and natural gas liquefaction device moves required water at low temperature continuously and enters low temperature water pump through pipeline (4) and carry out precooling after pipeline (5) is transported to natural gas liquefaction device; Unnecessary water at low temperature is accumulated in the low temperature pond; Water at low temperature is flow in the normal temperature pond by pipeline (6) be heated to normal temperature in natural gas liquefaction device after, and startup normal temperature water pump and handpiece Water Chilling Units are produced water at low temperature during the trough electricity price, so circulation.
2. the natural gas liquefaction process that utilizes night electricity according to claim 1, it is characterized in that: the chilled water that described handpiece Water Chilling Units provides is the water at low temperature more than 0 ℃, or having added 0 ℃~-35 ℃ later deep hypothermia water of frostproofer, described two pool volumes depend on the trough electricity price time length.
3. the natural gas liquefaction process that utilizes night electricity according to claim 2 is characterized in that: described frostproofer is ethylene glycol or calcium chloride.
CN 201010116744 2010-03-03 2010-03-03 Natural gas liquefaction process by utilizing night electricity Expired - Fee Related CN101838568B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201010116744 CN101838568B (en) 2010-03-03 2010-03-03 Natural gas liquefaction process by utilizing night electricity

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Application Number Priority Date Filing Date Title
CN 201010116744 CN101838568B (en) 2010-03-03 2010-03-03 Natural gas liquefaction process by utilizing night electricity

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CN101838568B CN101838568B (en) 2013-11-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108266962A (en) * 2018-01-16 2018-07-10 中科睿凌江苏低温设备有限公司 Utilize the natural gas liquefaction device of night electricity

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2593132Y (en) * 2003-03-28 2003-12-17 王全龄 Multisource heat pump air conditioner
CN2632559Y (en) * 2003-06-26 2004-08-11 扶承发 Cold storage air-conditioner water hot pump system combined with extinguishing pool
CN101201198A (en) * 2006-12-11 2008-06-18 南京理工大学 Refrigerant mechanical circulation type ice storage cold-hot pump air-conditioning unit
CN201289172Y (en) * 2008-10-27 2009-08-12 东莞市友美电源设备有限公司 Water cold storage air conditioner energy-conserving system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2593132Y (en) * 2003-03-28 2003-12-17 王全龄 Multisource heat pump air conditioner
CN2632559Y (en) * 2003-06-26 2004-08-11 扶承发 Cold storage air-conditioner water hot pump system combined with extinguishing pool
CN101201198A (en) * 2006-12-11 2008-06-18 南京理工大学 Refrigerant mechanical circulation type ice storage cold-hot pump air-conditioning unit
CN201289172Y (en) * 2008-10-27 2009-08-12 东莞市友美电源设备有限公司 Water cold storage air conditioner energy-conserving system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108266962A (en) * 2018-01-16 2018-07-10 中科睿凌江苏低温设备有限公司 Utilize the natural gas liquefaction device of night electricity

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Owner name: LIAONING HARBIN DEEP COLD GAS LIQUIFACTION EQUIPME

Free format text: FORMER OWNER: HARBIN COOL-GAS LIQUEFACTION EQUIPMENT CO., LTD.

Effective date: 20130923

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Free format text: CORRECT: ADDRESS; FROM: 150040 HARBIN, HEILONGJIANG PROVINCE TO: 112300 TIELING, LIAONING PROVINCE

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Effective date of registration: 20130923

Address after: 112300 North Zone, Kaiyuan Industrial Park, Liaoning, Tieling

Applicant after: Liaoning Harbin Shenleng Gas Liquefaction Equipment Co., Ltd.

Address before: Wanggang village Nangang District 150040 Heilongjiang satellite city of Harbin Province

Applicant before: Harbin Cyogenic Gases Liquefying Equipment Co., Ltd.

C14 Grant of patent or utility model
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C56 Change in the name or address of the patentee
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Address after: 112300, Kaiyuan Tieling Kaiyuan Economic Development Zone, Liaoning Province, North First Street, a

Patentee after: LIAONING CIMC HASHENLENG GAS LIQUEFACTION EQUIPMENT CO., LTD.

Address before: 112300 North Zone, Kaiyuan Industrial Park, Liaoning, Tieling

Patentee before: Liaoning Harbin Shenleng Gas Liquefaction Equipment Co., Ltd.

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131106

Termination date: 20210303