CN202250272U - Liquefied natural gas (LNG) cold energy four-stage recycling system - Google Patents
Liquefied natural gas (LNG) cold energy four-stage recycling system Download PDFInfo
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- CN202250272U CN202250272U CN2011202949592U CN201120294959U CN202250272U CN 202250272 U CN202250272 U CN 202250272U CN 2011202949592 U CN2011202949592 U CN 2011202949592U CN 201120294959 U CN201120294959 U CN 201120294959U CN 202250272 U CN202250272 U CN 202250272U
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Abstract
The utility model discloses a liquefied natural gas (LNG) cold energy four-stage recycling system, which comprises an LNG vaporization temperature-rising expansion main return circuit, a first-stage Rankine cycle power-generating unit, a second-stage Rankine cycle power-generating unit, an expansion power-generating unit and a low temperature ice-storage cooling unit. The LNG vaporization temperature-rising expansion main return circuit is composed of an LNG storage tank (1), a booster pump (2), a first condenser (3), a second condenser (8), a third expansion turbine (13) and a heat exchanger (15). The first-stage Rankine cycle power-generating unit is composed of the first condenser (3), a first compressor (4), a first evaporator (5), a first expansion turbine (6) and a first generator (7). The second-stage Rankine cycle power-generating unit, an expansion power-generating unit is composed of a second condenser (8), a second compressor (9), a second expansion turbine (11) and a second generator (1). The expansion power-generating unit is composed of the third expansion turbine (13) and a third generator (14). The low temperature ice-storage cooling unit is composed of the heat exchanger (15), a circulating pump (16) and an ice storage groove (17). The theoretical calculation shows that the comprehensive utilization ratio of LNG cold energy of the system can reach more than 38% under working pressure of 8MPa.
Description
Technical field
The utility model relates to the conversion using field of energy, particularly a kind of LNG (LNG Liquefied natural gas) cold energy level Four recycling system.This system to the mode that the LNG cold energy adopts level Four to recycle, has improved the recovery utilization rate of LNG cold energy according to the vaporizing property curve of LNG.
Background technique
Along with country improves with the requirement that improves energy-saving efficiency reducing carbon emission day by day, the energy consumption structure of China will be relied on rock gas more for counsel.In the supply of following rock gas, oversea LNG proportion accounts for than great share.No matter be LNG from overseas import, or the LNG that produces of China, when vaporization, to emit a large amount of cold energy, be generally 830-860kJ/kg.The approaches and methods that improves LNG cold energy use rate is all being made great efforts to explore in countries in the world, and wherein generating and cooling are main paties.At present, utilize the method for LNG cold energy generation to mainly contain direct expansion circulation, Lang Ken circulation or the combined cycle of the two etc.Because LNG cold energy release temperature span is big, the heat transfer temperature difference great disparity causes cold fire big with loss, and LNG cold energy use efficient is difficult to improve, and general LNG cold energy use rate has only about 30%.
Summary of the invention
The purpose of the utility model provides a kind of LNG cold energy level Four recycling system.This system to the mode that the LNG cold energy adopts level Four to recycle, has improved the recovery utilization rate of LNG cold energy according to the vaporizing property curve of LNG.
Described LNG cold energy level Four recycling system comprises:
1), the LNG vaporization intensification expansion major loop that constitutes by LNG storage tank, compression pump, first condenser, second condenser, the 3rd expansion turbine and heat exchanger, this major loop is connected with gas distributing system or user;
2) first order Lang Ken circulating generation unit that, constitutes by first condenser, first compressor, first vaporizer, first expansion turbine and first generator;
3) the Lang Ken circulating generation unit, the second level that, constitutes by second condenser, second compressor, second vaporizer, second expansion turbine and second generator;
4) the expansion power generation unit that, constitutes by the 3rd expansion turbine and the 3rd generator;
5) the low temperature ice storage cooling unit that, constitutes by heat exchanger, recycle pump and ice storage tank;
In said LNG vaporization intensification expansion major loop, the LNG storage tank is connected with heat exchanger with compression pump, first condenser, second condenser, the 3rd expansion turbine through pipeline successively;
In said first order Lang Ken circulating generation unit; First condenser is connected and gets back to the circulation loop of first condenser formation sealing successively with first compressor, first vaporizer and first expansion turbine through pipeline; In this circulation loop, be filled with refrigerant medium I; First expansion turbine is connected with first generator through mechanical axis, and first vaporizer is connected with low temperature cooling pipeline through another pipeline;
In Lang Ken circulating generation unit, the said second level; Second condenser is connected and gets back to the circulation loop of second condenser formation sealing successively with second compressor, second vaporizer and second expansion turbine through pipeline; In this circulation loop, be filled with refrigerant medium II; Second expansion turbine is connected with second generator through mechanical axis, and second vaporizer is connected with low temperature cooling pipeline through another pipeline;
In said expansion power generation unit, the 3rd expansion turbine is connected with the 3rd generator through mechanical axis;
In said low temperature ice storage cooling unit; Heat exchanger is connected and gets back to the circulation loop of heat exchanger formation sealing successively with ice storage tank with recycle pump through pipeline; In this circulation loop, be filled with refrigerant medium III, ice storage tank is connected with low temperature cooling pipeline through another pipeline.
Preferably, said refrigerant medium I comprises methane, ethane, propane, butane, isobutane, ethene, propylene, difluoromethane, fluoroform, Difluoroethane, HFC-143a, HFC-134a or pentafluoroethane.
Preferably, said refrigerant medium II comprises methane, ethane, propane, butane, isobutane, ethene, propylene, difluoromethane, fluoroform, Difluoroethane, HFC-143a, HFC-134a or pentafluoroethane.
Preferably, said refrigerant medium III comprises methane, ethane, propane, butane, isobutane, ethene, propylene, difluoromethane, fluoroform, Difluoroethane, HFC-143a, HFC-134a or pentafluoroethane.
In said LNG vaporization intensification expansion major loop; The LNG of LNG storage tank output delivers to first condenser after the compression pump pressurization; The heat of LNG absorption refrigerant medium I is vaporizated into the saturated vapour of rock gas in first condenser; This saturated vapour absorbs in second condenser and gets into the acting of expanding of the 3rd expansion turbine behind the heat of refrigerant medium II; Rock gas expansion acting cooling back gets into heat exchanger, and the heat of rock gas absorption refrigerant medium III heats up in heat exchanger, and the rock gas after the intensification gets into pipe network or user.
In said first order Lang Ken circulating generation unit; Refrigerant medium I is condensed into low-pressure liquid in first condenser;, first compressor pressurizes gets into first vaporizer then after being high-pressure liquid; To absorb the heat of vaporization of said low temperature cooling pipeline be high-pressure gaseous to refrigerant medium I in first vaporizer; The refrigerant medium I of this high-pressure gaseous gets into first expansion turbine; The acting step-down of in first expansion turbine, expanding is the refrigerant medium I of low pressure gaseous state, and the refrigerant medium I of this low pressure gaseous state gets into first condenser and is condensed into low-pressure liquid continuation circulation next time once more, and refrigerant medium I institute's work in first expansion turbine is converted into mechanical energy and drives first generator for electricity generation through mechanical axis.
In Lang Ken circulating generation unit, the said second level; Refrigerant medium II is condensed into low-pressure liquid in second condenser;, second compressor pressurizes gets into second vaporizer then after being high-pressure liquid; To absorb the heat of vaporization of said low temperature cooling pipeline be high-pressure gaseous to refrigerant medium II in second vaporizer; The refrigerant medium II of this high-pressure gaseous gets into second expansion turbine; The acting step-down of in second expansion turbine, expanding is the refrigerant medium II of low pressure gaseous state, and the refrigerant medium II of this low pressure gaseous state gets into second condenser and is condensed into low-pressure liquid continuation circulation next time once more, and refrigerant medium II institute's work in second expansion turbine is converted into mechanical energy and drives second generator for electricity generation through mechanical axis.
In said expansion power generation unit, rock gas institute's work in the 3rd expansion turbine is converted into mechanical energy and drives the 3rd generator for electricity generation through mechanical axis.
In said low temperature ice storage cooling unit; Refrigerant medium III is the rock gas release heat in LNG vaporization intensification expansion major loop in heat exchanger; Drive through recycle pump then and get into ice storage tank, in ice storage tank, get into heat exchanger once more behind the heat of refrigerant medium III absorption low temperature cooling pipeline and continue circulation next time.
The utlity model has following beneficial effect:
The utility model has made up two-stage Lang Ken circulation and one-level expansion cycle generator unit according to the segmentation characteristic of LNG vaporization curve, and is provided with low temperature cooling unit for improving LNG cold energy use rate, has realized the recycling of LNG cold energy level Four.Theoretical calculation shows that under the working pressure of 8MPa, the comprehensive utilization ratio of the LNG cold energy of said system can reach more than 38%, and as reducing working pressure, the comprehensive utilization ratio of LNG cold energy also can further improve.
Description of drawings
Fig. 1 is the schematic representation of the utility model embodiment 1 LNG cold energy level Four recycling system.
Embodiment
Below in conjunction with accompanying drawing and embodiment the summary of the invention of the utility model is done further to describe.
Embodiment 1
As shown in Figure 1, the LNG cold energy level Four recycling system that the utility model provides comprises:
1), by the LNG vaporization intensification expansion major loop that LNG storage tank 1, compression pump 2, first condenser 3, second condenser 8, the 3rd expansion turbine 13 and heat exchanger 15 constitute, this major loop is connected with gas distributing system or user;
2) first order Lang Ken circulating generation unit that, constitutes by first condenser 3, first compressor 4, first vaporizer 5, first expansion turbine 6 and first generator 7;
3) the Lang Ken circulating generation unit, the second level that, constitutes by second condenser 8, second compressor 9, second vaporizer 10, second expansion turbine 11 and second generator 12;
4) the expansion power generation unit that, constitutes by the 3rd expansion turbine 13 and the 3rd generator 14;
5) the low temperature ice storage cooling unit that, constitutes by heat exchanger 15, recycle pump 16 and ice storage tank 17.
In said LNG vaporization intensification expansion major loop, LNG storage tank 1 is connected with heat exchanger 15 with compression pump 2, first condenser 3, second condenser 8, the 3rd expansion turbine 13 through pipeline successively.
In said first order Lang Ken circulating generation unit; First condenser 3 through pipeline successively with first compressor 4, first vaporizer 5 is connected with first expansion turbine 6 and get back to the circulation loop that first condenser 3 constitutes sealing; In this circulation loop, be filled with refrigerant medium I; First expansion turbine 6 is connected with first generator 7 through mechanical axis, and first vaporizer 5 is connected with low temperature cooling pipeline through another pipeline.
In Lang Ken circulating generation unit, the said second level; Second condenser 8 through pipeline successively with second compressor 9, second vaporizer 10 is connected with second expansion turbine 11 and get back to the circulation loop that second condenser 8 constitutes sealing; In this circulation loop, be filled with refrigerant medium II; Second expansion turbine 11 is connected with second generator 12 through mechanical axis, and second vaporizer 10 is connected with low temperature cooling pipeline through another pipeline.
In said expansion power generation unit, the 3rd expansion turbine 13 is connected with the 3rd generator 14 through mechanical axis.
In said low temperature ice storage cooling unit; Heat exchanger 15 is connected and gets back to the circulation loop of heat exchanger 15 formation sealings successively with ice storage tank 17 with recycle pump 16 through pipeline; In this circulation loop, be filled with refrigerant medium III, ice storage tank 17 is connected with low temperature cooling pipeline through another pipeline.
Because component and the content thereof of LNG there are differences; The segmentation characteristic of LNG vaporization curve is also different along with the difference of the working pressure in the LNG vaporescence, and therefore said refrigerant medium I, said refrigerant medium II and said refrigerant medium III need select for use and allocate according to actual conditions.
In said LNG vaporization intensification expansion major loop; The LNG of LNG storage tank 1 output delivers to first condenser 3 after compression pump 2 pressurizations; The heat of LNG absorption refrigerant medium I is vaporizated into the saturated vapour of rock gas in first condenser 3; This saturated vapour absorbs in second condenser 8 and gets into the acting of expanding of the 3rd expansion turbine 13 behind the heat of refrigerant medium II; Rock gas expansion acting cooling back gets into heat exchanger 15, and the heat of rock gas absorption refrigerant medium III heats up in heat exchanger 15, and the rock gas after the intensification gets into pipe network or user.
In said first order Lang Ken circulating generation unit; Refrigerant medium I is condensed into low-pressure liquid in first condenser 3;, first compressor 4 gets into first vaporizer 5 then after being pressurised into high-pressure liquid; To absorb the heat of vaporization of said low temperature cooling pipeline be high-pressure gaseous to refrigerant medium I in first vaporizer 5; The refrigerant medium I of this high-pressure gaseous gets into first expansion turbine 6; The acting step-down of in first expansion turbine 6, expanding is the refrigerant medium I of low pressure gaseous state, and the refrigerant medium I of this low pressure gaseous state gets into first condenser 3 and is condensed into low-pressure liquid continuation circulation next time once more, and refrigerant medium I institute's work in first expansion turbine 6 is converted into mechanical energy and drives 7 generatings of first generator through mechanical axis.
In Lang Ken circulating generation unit, the said second level; Refrigerant medium II is condensed into low-pressure liquid in second condenser 8;, second compressor 9 gets into second vaporizer 10 then after being pressurised into high-pressure liquid; To absorb the heat of vaporization of said low temperature cooling pipeline be high-pressure gaseous to refrigerant medium II in second vaporizer 10; The refrigerant medium II of this high-pressure gaseous gets into second expansion turbine 11; The acting step-down of in second expansion turbine 11, expanding is the refrigerant medium II of low pressure gaseous state, and the refrigerant medium II of this low pressure gaseous state gets into second condenser 8 and is condensed into low-pressure liquid continuation circulation next time once more, and refrigerant medium II institute's work in second expansion turbine 11 is converted into mechanical energy and drives 12 generatings of second generator through mechanical axis.
In said expansion power generation unit, rock gas institute's work in the 3rd expansion turbine 13 is converted into mechanical energy and drives 14 generatings of the 3rd generator through mechanical axis.
In said low temperature ice storage cooling unit; Refrigerant medium III is the rock gas release heat in LNG vaporization intensification expansion major loop in heat exchanger 15; Drive through recycle pump 16 then and get into ice storage tank 17, in ice storage tank 17, get into heat exchanger 15 once more behind the heat of refrigerant medium III absorption low temperature cooling pipeline and continue circulation next time.
Should be appreciated that the above detailed description of the technological scheme of the utility model being carried out by preferred embodiment is schematic and nonrestrictive.Those of ordinary skill in the art can make amendment to the technological scheme that each embodiment put down in writing on the basis of reading the utility model specification, perhaps part technical characteristics wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of each embodiment's technological scheme of essence disengaging the utility model of relevant art scheme.
Claims (4)
1. LNG cold energy level Four recycling system is characterized in that this system comprises:
1), by the LNG vaporization intensification expansion major loop that LNG storage tank (1), compression pump (2), first condenser (3), second condenser (8), the 3rd expansion turbine (13) and heat exchanger (15) constitute, this major loop is connected with gas distributing system or user;
2) first order Lang Ken circulating generation unit that, constitutes by first condenser (3), first compressor (4), first vaporizer (5), first expansion turbine (6) and first generator (7);
3) the Lang Ken circulating generation unit, the second level that, constitutes by second condenser (8), second compressor (9), second vaporizer (10), second expansion turbine (11) and second generator (12);
4) the expansion power generation unit that, constitutes by the 3rd expansion turbine (13) and the 3rd generator (14);
5) the low temperature ice storage cooling unit that, constitutes by heat exchanger (15), recycle pump (16) and ice storage tank (17);
In said LNG vaporization intensification expansion major loop, LNG storage tank (1) is connected with compression pump (2), first condenser (3), second condenser (8), the 3rd expansion turbine (13) and heat exchanger (15) through pipeline successively;
In said first order Lang Ken circulating generation unit; First condenser (3) is connected and gets back to the circulation loop of first condenser (3) formation sealing successively with first compressor (4), first vaporizer (5) and first expansion turbine (6) through pipeline; In this circulation loop, be filled with refrigerant medium I; First expansion turbine (6) is connected with first generator (7) through mechanical axis, and first vaporizer (5) is connected with low temperature cooling pipeline through another pipeline;
In Lang Ken circulating generation unit, the said second level; Second condenser (8) is connected and gets back to the circulation loop of second condenser (8) formation sealing successively with second compressor (9), second vaporizer (10) and second expansion turbine (11) through pipeline; In this circulation loop, be filled with refrigerant medium II; Second expansion turbine (11) is connected with second generator (12) through mechanical axis, and second vaporizer (10) is connected with low temperature cooling pipeline through another pipeline;
In said expansion power generation unit, the 3rd expansion turbine (13) is connected with the 3rd generator (14) through mechanical axis;
In said low temperature ice storage cooling unit; Heat exchanger (15) is connected and gets back to the circulation loop of heat exchanger (15) formation sealing successively with ice storage tank (17) with recycle pump (16) through pipeline; In this circulation loop, be filled with refrigerant medium III, ice storage tank (17) is connected with low temperature cooling pipeline through another pipeline.
2. system according to claim 1; It is characterized in that said refrigerant medium I adopts methane, ethane, propane, butane, isobutane, ethene, propylene, difluoromethane, fluoroform, Difluoroethane, HFC-143a, HFC-134a or pentafluoroethane material.
3. system according to claim 1; It is characterized in that said refrigerant medium II adopts methane, ethane, propane, butane, isobutane, ethene, propylene, difluoromethane, fluoroform, Difluoroethane, HFC-143a, HFC-134a or pentafluoroethane material.
4. system according to claim 1; It is characterized in that said refrigerant medium III adopts methane, ethane, propane, butane, isobutane, ethene, propylene, difluoromethane, fluoroform, Difluoroethane, HFC-143a, HFC-134a or pentafluoroethane material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202949592U CN202250272U (en) | 2011-08-15 | 2011-08-15 | Liquefied natural gas (LNG) cold energy four-stage recycling system |
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| CN2011202949592U CN202250272U (en) | 2011-08-15 | 2011-08-15 | Liquefied natural gas (LNG) cold energy four-stage recycling system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943698A (en) * | 2011-08-15 | 2013-02-27 | 北京天成山泉电子科技有限公司 | LNG (Liquefied Natural Gas) cold energy four-stage recycling system and use method thereof |
| CN103206317A (en) * | 2013-04-24 | 2013-07-17 | 哈尔滨广瀚新能动力有限公司 | Cascaded recycling system for waste heat of internal combustion generating set |
| CN103266924A (en) * | 2013-05-02 | 2013-08-28 | 上海维尔泰克螺杆机械有限公司 | System and method for efficiently generating power from steam |
| CN104595707A (en) * | 2014-12-30 | 2015-05-06 | 西安交通大学 | Gain recycling system of liquefied natural gas (LNG) cold energy |
| CN106014518A (en) * | 2016-07-19 | 2016-10-12 | 泉州装备制造研究所 | Refrigerator truck generating electricity through LNG cold energy gradient utilization |
| CN111237890A (en) * | 2020-01-10 | 2020-06-05 | 中国空间技术研究院 | Liquid nitrogen cold quantity cascade utilization system and control method thereof |
| CN111485965A (en) * | 2019-01-25 | 2020-08-04 | 碧海舟（北京）节能环保装备有限公司 | L NG cold energy recovery power generation method and device based on carbon dioxide working medium |
| CN112833327A (en) * | 2021-01-19 | 2021-05-25 | 华南理工大学 | LNG cold energy utilization process device integrating heat transfer and separation |
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2011
- 2011-08-15 CN CN2011202949592U patent/CN202250272U/en not_active Withdrawn - After Issue
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943698A (en) * | 2011-08-15 | 2013-02-27 | 北京天成山泉电子科技有限公司 | LNG (Liquefied Natural Gas) cold energy four-stage recycling system and use method thereof |
| CN102943698B (en) * | 2011-08-15 | 2015-09-09 | 北京天成山泉电子科技有限公司 | A kind of LNG cold energy level Four recycling system and using method thereof |
| CN103206317A (en) * | 2013-04-24 | 2013-07-17 | 哈尔滨广瀚新能动力有限公司 | Cascaded recycling system for waste heat of internal combustion generating set |
| CN103206317B (en) * | 2013-04-24 | 2014-11-05 | 哈尔滨广瀚新能动力有限公司 | Cascaded recycling system for waste heat of internal combustion generating set |
| CN103266924A (en) * | 2013-05-02 | 2013-08-28 | 上海维尔泰克螺杆机械有限公司 | System and method for efficiently generating power from steam |
| CN104595707A (en) * | 2014-12-30 | 2015-05-06 | 西安交通大学 | Gain recycling system of liquefied natural gas (LNG) cold energy |
| CN104595707B (en) * | 2014-12-30 | 2016-06-29 | 西安交通大学 | A kind of gain recycling system of cold energy of liquefied natural gas |
| CN106014518A (en) * | 2016-07-19 | 2016-10-12 | 泉州装备制造研究所 | Refrigerator truck generating electricity through LNG cold energy gradient utilization |
| CN111485965A (en) * | 2019-01-25 | 2020-08-04 | 碧海舟（北京）节能环保装备有限公司 | L NG cold energy recovery power generation method and device based on carbon dioxide working medium |
| CN111237890A (en) * | 2020-01-10 | 2020-06-05 | 中国空间技术研究院 | Liquid nitrogen cold quantity cascade utilization system and control method thereof |
| CN112833327A (en) * | 2021-01-19 | 2021-05-25 | 华南理工大学 | LNG cold energy utilization process device integrating heat transfer and separation |
| CN112833327B (en) * | 2021-01-19 | 2023-11-03 | 华南理工大学 | LNG cold energy utilization process device integrating heat transfer and separation |
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