CN101838568B - Natural gas liquefaction process by utilizing night electricity - Google Patents
Natural gas liquefaction process by utilizing night electricity Download PDFInfo
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- CN101838568B CN101838568B CN 201010116744 CN201010116744A CN101838568B CN 101838568 B CN101838568 B CN 101838568B CN 201010116744 CN201010116744 CN 201010116744 CN 201010116744 A CN201010116744 A CN 201010116744A CN 101838568 B CN101838568 B CN 101838568B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 230000005611 electricity Effects 0.000 title claims abstract description 35
- 239000003345 natural gas Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 230000002631 hypothermal effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 1
- 230000003203 everyday effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
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- Separation By Low-Temperature Treatments (AREA)
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
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) only has 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 less.And in the natural gas liquids tooling cost, the electricity charge account for total production cost more than 70%.Most areas all adopt by the time disjunction with different electricity price charging ways in world wide, and the electricity charge at night are very cheap.Utilize night cheap some equipment of power start to produce unnecessary cold and be stored up, again this part cold is discharged to reach the purpose that reduces operation power charge when the electricity charge are higher in the daytime.Utilize the Refrigeration Technique of cheap electric power at night to require that larger cold-storage space and more cool storage material are arranged, its one-time investment is larger, 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, it is little to invest, working cost is low.
Above-mentioned purpose realizes by following technical scheme:
Utilize the natural gas liquefaction process of night electricity, the normal-temperature water be accumulated in during the trough electricity price night in the normal temperature pond is sucked and is entered handpiece Water Chilling Units by pipeline (2) by the normal temperature water pump from pipeline (1), in handpiece Water Chilling Units, normal-temperature water enters the low temperature pond as chilled water through pipeline (3) after being cooled by normal temperature, and natural gas liquefaction device moves continuously required water at low temperature and enters low temperature water pump through pipeline (4) and be transported to natural gas liquefaction device by pipeline (5) and carry out precooling; Unnecessary water at low temperature is accumulated in the low temperature pond; Water at low temperature after being heated to normal temperature in natural gas liquefaction device in pipeline (6) flows to the normal temperature pond, start normal temperature water pump and handpiece Water Chilling Units during the trough electricity price and produce water at low temperature, 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 the later deep hypothermia water of 0 ℃～-35 ℃ 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 is 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, when par and crest electricity price, shut down, and the water at low temperature that work schedule is got is except feeding mechanism, and unnecessary cold water is stored in the low temperature pond.When handpiece Water Chilling Units is shut down again by the Cold water supply liquefying plant of accumulating in the low temperature pond.The normal-temperature water heated by device flows in the normal temperature pond to be accumulated.The handpiece Water Chilling Units on period uses the normal-temperature water pump delivery to handpiece Water Chilling Units normal-temperature water again.
The invention solves other and utilize the larger 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, two water reservoirs of increase can double as fire-water pond, separately do not increase investment and floor space, 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/day | 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 refers to that adopting the expense conversion of saving after the night electricity technology is the unit consumption while reducing 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.
The accompanying drawing explanation:
Accompanying drawing 1 is process flow sheet of the present invention.
Embodiment:
Embodiment 1:
Utilize the natural gas liquefaction process of night electricity, the normal-temperature water be accumulated in during the trough electricity price night in the normal temperature pond is sucked and is entered handpiece Water Chilling Units by pipeline 2 by the normal temperature water pump from pipeline 1, in handpiece Water Chilling Units, normal-temperature water enters the low temperature pond as chilled water through pipeline 3 after being cooled by normal temperature, and natural gas liquefaction device moves continuously required water at low temperature and enters low temperature water pump through pipeline 4 and be transported to natural gas liquefaction device by pipeline 5 and carry out precooling; Unnecessary water at low temperature is accumulated in the low temperature pond; Water at low temperature is being flow in the normal temperature pond by pipeline 6 after being heated to normal temperature in natural gas liquefaction device, and during the trough electricity price, startup normal temperature water pump and handpiece Water Chilling Units are produced water at low temperature, so circulation.
Embodiment 2:
The described natural gas liquefaction process that utilizes night electricity of embodiment 1, the chilled water that described handpiece Water Chilling Units provides is the water at low temperature more than 0 ℃, or having added frostproofer later 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 (1)
1.
a kind of natural gas liquefaction process that utilizes night electricity, it is characterized in that: two water reservoirs in normal temperature pond and low temperature pond are set, described water reservoir doubles as fire-water pond, the normal-temperature water be accumulated in during the trough electricity price night in the normal temperature pond is sucked and is entered handpiece Water Chilling Units through pipeline (2) by the normal temperature water pump from pipeline (1), in handpiece Water Chilling Units, normal-temperature water enters the low temperature pond as chilled water through pipeline (3) after being cooled by normal temperature, the natural gas liquefaction device continuously required water at low temperature of operation enters low temperature water pump from the low temperature pond through pipeline (4) and is transported to natural gas liquefaction device by pipeline (5) and carries out precooling, water at low temperature after being heated to normal temperature in natural gas liquefaction device in pipeline (6) flows to the normal temperature pond, start normal temperature water pump and handpiece Water Chilling Units during the trough electricity price and produce water at low temperature, so circulation, handpiece Water Chilling Units was worked during the trough electricity price at night, when par and crest electricity price, shut down, and the water at low temperature that work schedule is got is except the supply natural gas liquefaction device, and unnecessary water at low temperature is stored in the low temperature pond, again the water at low temperature of accumulating in the low temperature pond is supplied with to natural gas liquefaction device when handpiece Water Chilling Units is shut down, the normal-temperature water heated by natural gas liquefaction device flows in the normal temperature pond to be accumulated, and the handpiece Water Chilling Units on period uses the normal-temperature water pump delivery to handpiece Water Chilling Units normal-temperature water again, the chilled water that described handpiece Water Chilling Units provides is the water at low temperature more than 0 ℃, or has added ethylene glycol or the later deep hypothermia water of 0 ℃ ~-35 ℃ of calcium chloride, and described two water reservoir volumes depend on the trough electricity price time length.
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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| Publication Number | Publication Date |
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| CN101838568A CN101838568A (en) | 2010-09-22 |
| CN101838568B true CN101838568B (en) | 2013-11-06 |
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| CN 201010116744 Expired - Fee Related CN101838568B (en) | 2010-03-03 | 2010-03-03 | Natural gas liquefaction process by utilizing night electricity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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)
| 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 |
-
2010
- 2010-03-03 CN CN 201010116744 patent/CN101838568B/en not_active Expired - Fee Related
Patent Citations (4)
| 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 |
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| CN101838568A (en) | 2010-09-22 |
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
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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| TA01 | Transfer of patent application right |
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. |
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| C14 | Grant of patent or utility model | ||
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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. |
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| 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 |