CN104373165A - System for generating power through liquefied natural gas cold energy - Google Patents
System for generating power through liquefied natural gas cold energy Download PDFInfo
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- CN104373165A CN104373165A CN201410567493.7A CN201410567493A CN104373165A CN 104373165 A CN104373165 A CN 104373165A CN 201410567493 A CN201410567493 A CN 201410567493A CN 104373165 A CN104373165 A CN 104373165A
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Abstract
The invention discloses a system for generating power through liquefied natural gas cold energy. The system comprises a first LNG pump, a second LNG pump, a third LNG pump, a low-pressure natural gas condenser, a medium-pressure natural gas condenser, a low-pressure coolant condenser, a first liquid coolant pump, a second liquid coolant pump, a third liquid coolant pump, a coolant vaporizer, a high-pressure natural gas heater, a high-pressure natural gas superheater, a coolant expander, a natural gas expander, a secondary medium-pressure coolant condenser and a medium-pressure coolant condenser. The whole power generation process includes two parts of a natural gas medium Rankine cycle and a mixed coolant medium Rankine cycle. Useful energy loss generated in the LNG cold energy recycling process is reduced and the power generation efficiency of LNG cold energy is improved.
Description
Technical field
The present invention relates to new energy field, in particular to a kind of system utilizing cold energy of liquefied natural gas to generate electricity.
Background technique
LNG (Liquefied Natural Gas, LNG Liquefied natural gas) cold energy is a kind of clean energy resource of very high-quality, rock gas needs the electric energy of consumption 500 ~ 600kW h/t in the process of liquefaction, can discharge about 230kW h/t cold energy when gasification.LNG cold energy generation is technique more ripe in LNG cold energy use; LNG is utilized to gasify as the pressure energy discharged in the cold energy that discharges in gaseous state process and pipe network downstream user pressure regulation process generates electricity; be the mode that a kind of large-scale recovery utilizes receiving station's cold energy, a large amount of low-carbon (LC), green electric energy can be provided for the coastal area of energy scarcity simultaneously.
At present utilize the Rankine of the refrigerant circulation of LNG low temperature cold to generate electricity about utilizing the technology of LNG cold energy generation to mainly contain, utilize LNG pressure can direct expansion generating and the combination method generating of comprehensive these two kinds of technology.
1, direct expansion method
Direct expansion method is a kind of mode utilizing the pressure energy of LNG to generate electricity.In storage tank, the LNG of normal pressure is forced into pipe network discharge pressure through pump, utilizes high-pressure natural gas Direct driver turbo-expander after vaporizer heating and gasifying, and drive electrical generators generates electricity.Vaporizer thermal source can adopt seawater, also can use other thermals source.Such as Tokyo Electric Power utilizes LNG differential pressure power generation station, i.e. direct expansion method generates electricity.First LNG improves pressure through pump pressurization, then by vaporizer heating and gasifying, then enters turbine engine expansion work.Direct expansion method generation mode system is simple, it is low to invest, but efficiency is not high, and generated output is less, and the generated energy of LNG per ton is at about 25.0 ~ 30.0kWh, and energy efficiency is about 26 ~ 31%.
2, the Rankine cycle method of intermediate heat carrier
The Rankine cycle method of intermediate heat carrier is the mode utilizing LNG low temperature cold to generate electricity, its process is that LNG is transformed into cold on a certain refrigerant by condenser, utilize the temperature difference between LNG and environment, promote refrigerant and carry out Steam Power Circulation, thus generating of externally doing work.There is the Rankine cycle system of single working medium Rankine cycle system, mixed working fluid in the generating of wherein Rankine cycle method, usually with the mixture of lower boiling R12, R13, R22 or ethane, propane or multicomponent hydro carbons for refrigerant, take seawater as thermal source, take LNG as low-temperature receiver, carry out organic rankie cycle generating.US Patent No. 6089028A describes a kind of Rankine cycle utilizing 50% methane to add the mixture coolant media of 50% ethane composition, high pressure LNG gasifies the cold energy part that discharges for the cascade EDFA of LNG vapor compression in that patent, another part is used for the condensation of 50%-50% methane and ethane mixing cold media air, again by after supercharging after the condensation of mixing refrigerant, the external heat source such as seawater are utilized to be heated gasification, then expansion work in turbine is entered, and the generating of driving electric machine.
3, combination method
Combination method combines direct expansion method and Rankine cycle method.First LNG is enhanced pressure, then discharges to refrigerant by condenser by cold, and promotion refrigerant carries out Rankine cycle and externally does work, and the rock gas of gasification is done work by turbine expansion again.
Direct expansion-mono-working medium Rankine cycle system that spring north LNG base low-temperature electricity-generating factory such as belonging to Osaka, Japan Gas Company adopts.First LNG Liquefied natural gas is improved pressure by compression, then discharges to refrigerant by condenser by cold, and promotion refrigerant carries out Rankine cycle and externally does work, and the rock gas of gasification is done work by turbine expansion again.
In above-mentioned technology, the efficiency of direct expansion method single utilization pressure energy or cold energy generation is all lower, for LNG receiving station, substantially all require that the rock gas after gasifying can directly enter high-pressure natural gas pipe network, pressure is at about 7 ~ 10MPa, therefore in most cases, in order to ensure that suction pressure all cannot utilize direct expansion method to utilize the pressure energy of high-pressure natural gas to generate electricity in LNG receiving station.
And utilize in the Rankine cycle electricity-generating method of LNG cold energy, select to adopt single hydro carbons to be that coolant media is to reclaim cold energy, because the liquefaction curve of single coolant media differs more with the gasification curve of LNG, cause exergy loss in cold energy callback course comparatively large, cause generating efficiency lower.The generated energy of LNG per ton at about 20.0 ~ 24.0kWh, energy efficiency 21 ~ 25%.Combination method electrification technique as well as generally also will adopt heating of seawater, consume a large amount of seawater, the cold transferring to seawater is not also utilized, simultaneously because of the restriction by ocean temperature, the temperature that working medium can heat by seawater is not high, make the thermal efficiency of turbo-expander lower, the utilization of generated energy and LNG cold is restricted.
Summary of the invention
The invention provides a kind of system utilizing cold energy of liquefied natural gas to generate electricity, in order to improve utilization ratio and the generated energy of LNG cold.
For achieving the above object, the invention provides a kind of system utilizing cold energy of liquefied natural gas to generate electricity, comprise: the first LNG pump, the second LNG pump, the 3rd LNG pump, low pressure natural gas condenser, middle pressure rock gas condenser, low pressure refrigerant condenser, first liquid refrigerant pump, second liquid refrigerant pump, the 3rd liquid coolant pump, refrigerant vaporizer, high-pressure natural gas heater, high-pressure natural gas superheater, refrigerant decompressor, Natural gas expander, secondary middle pressure refrigerant condenser and middle pressure refrigerant condenser, wherein:
Described low pressure natural gas condenser is connected with described first LNG pump, described second LNG pump, described Natural gas expander respectively, the low temperature LNG entered in it is pressurized to the high pressure LNG that 9 ~ 10MPa obtains and sends into described low pressure natural gas condenser by described first LNG pump, the low pressure NG that its end is discharged is sent into described low pressure natural gas condenser by described Natural gas expander, this high pressure LNG and this low pressure NG carries out heat exchange in described low pressure natural gas condenser, and this low pressure NG after heat exchange is liquefied as low pressure LNG and enters described second LNG pump supercharging;
Described middle pressure rock gas condenser is connected with three-way valve, described Natural gas expander, described 3rd LNG pump respectively, high pressure LNG after the heat exchange of described low pressure natural gas condenser enters described middle pressure rock gas condenser with the liquid NG after described second LNG pump supercharging after three-way valve converges, the middle pressure NG that described Natural gas expander is extracted out enters described middle pressure rock gas condenser, mixed high pressure LNG and the middle NG of pressure carries out heat exchange in described middle pressure rock gas condenser, and the middle pressure NG after heat exchange is liquefied as middle pressure LNG and enters described 3rd LNG pump supercharging;
Described low pressure refrigerant condenser respectively with three-way valve, described refrigerant decompressor, described first liquid refrigerant pump is connected, high pressure LNG after the heat exchange of described middle pressure rock gas condenser enters described low pressure refrigerant condenser with the LNG after described 3rd LNG pump supercharging after three-way valve converges, the low-pressure gas refrigerant that described refrigerant decompressor exports enters described low pressure refrigerant condenser, mixed high pressure LNG and low-pressure gas refrigerant carry out heat exchange in described low pressure refrigerant condenser, high pressure LNG gasifies and produces high pressure NG, low-pressure gas refrigerant absorbs cold liquefaction and is low pressure liquid refrigerant and enters the supercharging of described first liquid refrigerant pump,
In described time pressure refrigerant condenser respectively with described low pressure refrigerant condenser, described first liquid refrigerant pump, described refrigerant decompressor, described second liquid refrigerant pump is connected, high pressure NG after gasification enters pressure refrigerant heat exchanger in described time, highly pressurised liquid refrigerant after the supercharging of described first liquid refrigerant pump enters pressure refrigerant condenser in described time, the secondary medium pressure refrigerant gas that described refrigerant decompressor exports enters pressure refrigerant condenser in described time, low pressure liquid refrigerant after high pressure NG and supercharging, secondary medium pressure refrigerant gas generation heat exchange, secondary medium pressure refrigerant gas absorbs cold energy liquefaction and is time middle press liquid refrigerant and enters the supercharging of described second liquid refrigerant pump,
Described middle pressure refrigerant condenser respectively with three-way valve, pressure refrigerant condenser in described time, described refrigerant decompressor, described 3rd liquid coolant pump is connected, secondary middle press liquid refrigerant after the supercharging of described second liquid refrigerant pump with from described time, to press refrigerant condenser out, low pressure liquid refrigerant after supercharging enters described middle pressure refrigerant condenser after three-way valve converges, medium pressure refrigerant gas is sent into described middle pressure refrigerant condenser by described refrigerant decompressor, the mixed solution of the secondary middle press liquid refrigerant from described time after pressure refrigerant condenser high pressure NG out and supercharging and the low pressure liquid refrigerant after supercharging, medium pressure refrigerant gas carries out heat exchange in described middle pressure refrigerant condenser, become middle press liquid refrigerant after medium pressure refrigerant gas heat exchange to enter described 3rd liquid coolant pump and carry out supercharging,
Described refrigerant vaporizer is connected with three-way valve, described refrigerant decompressor, after three-way valve converges, enter described refrigerant vaporizer from described middle pressure refrigerant condenser highly pressurised liquid refrigerant out with press liquid refrigerant after supercharging, heating and gasifying is that gaseous state enters the acting of described refrigerant decompressor;
Described high-pressure natural gas heater is connected with described middle pressure refrigerant condenser, described high-pressure natural gas superheater respectively, described high-pressure natural gas heater is entered from the high pressure NG after the heat exchange out of described middle pressure refrigerant condenser, go to gas distributing system with heat medium water heat exchange rear portion, a part is gone to and is sent to described Natural gas expander after high-pressure natural gas superheater heats further and carries out circulating generation.
Further, described refrigerant vaporizer, described high-pressure natural gas heater and described high-pressure natural gas superheater adopt heat medium water heat exchange.
Further, said system also comprises the heat exchanger of heat medium water and cigarette factory gas, from the heat exchanger of described heat medium water and cigarette factory gas out enter described refrigerant vaporizer with the heat medium water after flue gas heat exchange respectively by three-way valve, described high-pressure natural gas superheater carries out heat exchange, from described refrigerant vaporizer, enter described high-pressure natural gas heater after described high-pressure natural gas superheater heat medium water is out converged by three-way valve and carry out heat exchange, the heat exchanger entering described heat medium water and cigarette factory gas from described high-pressure natural gas heater heat medium water out further carries out thermal cycle.
Further, the refrigerant that said system adopts is hydrocarbon mixture.
The present invention is relative to prior art, and tool has the following advantages:
1, improve LNG cold recovery rate, the present invention devises the Rankine cycle system of two media, gas medium can directly with the rock gas obtained after LNG gasification, without the need to purchasing in addition, and make use of low pressure natural gas, middle pressure rock gas, low pressure refrigerant, secondary middle pressure refrigerant and middle pressure refrigerant and LNG heat exchange step by step, achieve the utilization step by step of LNG cold energy;
2, the Rankine cycle of refrigerant medium of the present invention, can adopt hydrocarbon mixture as refrigerant, makes the gasification curve of the liquefaction curve of coolant media and LNG as far as possible close, reduces exergy loss in cold energy callback course, improves generating efficiency;
3, the recycling of low temperature exhaust heat, by the low temperature exhaust heat drawing-in system of plant gas, is used for heated natural gas and refrigerant medium, improves the temperature that rock gas and low temperature refrigerant medium enter turbo-expander, thus improves the generating efficiency of system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the system schematic utilizing cold energy of liquefied natural gas to generate electricity of one embodiment of the invention.
Number in the figure illustrates: 1,3, and 5 is liquefied natural gas pump; 2 is low pressure natural gas condensers, and 4 is middle pressure rock gas condensers; 6 is low pressure refrigerant condensers; 7,8,9 is liquid coolant pumps; 10 is refrigerant vaporizers; 11 is high-pressure natural gas heaters; 12 is high-pressure natural gas superheaters; 13 is refrigerant decompressors; 14 is Natural gas expanders; 15 is time middle pressure refrigerant condensers; 16 is middle pressure refrigerant condensers; 17 is heat exchangers of heat medium water and cigarette factory gas.
Following numbering is made in relevant logistics: 101 is the LNG Liquefied natural gas (LNG) after supercharging; 102 be with low pressure natural gas heat exchange after high pressure LNG; 103 be with middle pressure heat exchange gas after high pressure LNG; 104 be with low pressure refrigerant heat exchange after high pressure LNG gasify after the high pressure NG that produces; 105 be with secondary middle pressure refrigerant steam and the heat exchange of highly pressurised liquid refrigerant after high pressure NG; 106 be with middle pressure refrigerant steam and the heat exchange of highly pressurised liquid refrigerant after high pressure NG; 107 be with heat medium water heat exchange after high pressure NG; The 108 high pressure NG going to pipe network; 109 is the high pressure NG for circulating generation; 110 be with heat medium water heat exchange after high pressure NG; 111 is middle pressure NG that rock gas turbo-expander is extracted out; 112 is the low pressure NG turbo-expander; 113 is the low pressure LNG after rock gas condenser; 114 be liquid NG increase after with high pressure LNG mix logistics; 115 is the middle pressure LNG after rock gas condenser; 116 are high pressure LNG of flowing out in middle pressure rock gas condenser with 103 mix logistics; 201 be with heat medium water heat exchange after pressurized gas refrigerant; 202 is medium pressure refrigerant gas; 203 is time medium pressure refrigerant gas; 204 is low-pressure gas refrigerants; 205 is low pressure liquid refrigerants; 206 is time middle press liquid refrigerants; 207 be time in after the supercharging of press liquid refrigerant with 205 superchargings after mixing material refrigerant; 208 is middle press liquid refrigerants; 209 is the mixing material refrigerants with highly pressurised liquid refrigerant after the supercharging of middle pressure refrigerant; 301 is the heat medium waters with high pressure NG heat exchange; 302 be with flue gas heat exchange after heat medium water; 303 is that heating is used for the heat medium water of high pressure NG of circulating generation; 304 are used to the heat medium water heating low temperature refrigerant.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the system schematic utilizing cold energy of liquefied natural gas to generate electricity of one embodiment of the invention, and as shown in the figure, the whole power generation process of this system comprises gas medium Rankine cycle and mixing coolant media Rankine cycle two parts.
1, gas medium Rankine cycle
First need the low temperature LNG gasified to be pressurized to 9 ~ 10MPa through LNG pump 1 after, become highly pressurised liquid 101,101 discharges with rock gas turbo-expander end 112 in heat exchange gas device 2, there is heat exchange, 112 liquefy is low pressure LNG113; 113 after LNG pump 3 supercharging and from 2 logistics 102 equipressure be out mixed to form logistics 114; 114 with after there is heat exchange in the middle NG111 of pressure gone out in Natural gas expander, and middle pressure NG111 is liquefied as middle pressure LNG115, after supercharging, be mixed to form high pressure LNG mixing logistics 116 with 103 equipressures.High pressure LNG mixing logistics 116 absorbs heat in coolant media Rankine cycle, is all gasificated into high pressure NG.Again after the heat medium water heating of gas heater 107, be then divided into the high-pressure natural gas medium 109 for circulating generation by shunt, remaining enters gas distributing system 108.108 again with heat medium water heat exchange after, enter expansion work in rock gas turbo-expander, the middle pressure NG111 extracted out in the middle of decompressor and decompressor end outlet low pressure NG112.
2, coolant media Rankine cycle
Low pressure refrigerant steam 204 heat exchange that high pressure LNG mixing logistics 116 end outlet in refrigerant condenser 6 and from refrigerant turbo-expander obtained in gas medium Rankine cycle is discharged, after absorbing heat, high pressure LNG gasifies, and then enters time middle pressure refrigerant heat exchanger; And low pressure refrigerant steam is all liquefied as 205 after also absorbing cold, heat exchange is there is through secondary middle pressure refrigerant heat exchanger and the high pressure NG just now gasified and secondary middle pressure refrigerant steam 203 after supercharging, secondary middle pressure refrigerant also becomes liquid refrigerants 206, after supercharging, become middle pressure liquid refrigerants, form 207 after mixing with high-pressure liquid refrigerant and with high pressure NG105 and middle pressure refrigerant steam 202, heat exchange occurs in middle pressure refrigerant heat exchanger.Middle pressure refrigerant vapor liquid changes into 208 after supercharging, therefrom presses the liquid refrigerants of refrigerant heat exchanger flow process to be mixed to form high-pressure liquid refrigerant 209.High-pressure liquid refrigerant, through refrigerant heater, is all gasificated into gaseous state, then enters turbo-expander acting.
In whole power generation process, after heat medium water and the gas generation heat exchange of high temperature cigarette factory, be divided into two-part, a part is used for refrigerant heater heat exchange, another part is used for the heater heating in gas medium Rankine cycle, then, after the mixing of two-part heat medium water and after heat exchange occurs in logistics 107, return and the heat exchange again of cigarette factory gas.
Such scheme of the present invention is on the basis of existing combination method generation technology, carries out the Optimal improvements improving LNG cold generating efficiency, comprises Rankine cycle power generation system two parts of gas medium Rankine cycle and mixing refrigerant medium.Low-temperature heat source involved in two circulations, can adopt the heat medium water of 60 ~ 80 DEG C, and this heat medium water can be formed after recovery is built in the waste heat of the plant gas flue gas near LNG receiving station.
The present invention is relative to prior art, and tool has the following advantages:
1, improve LNG cold recovery rate, the present invention devises the Rankine cycle system of two media, gas medium can directly with the rock gas obtained after LNG gasification, without the need to purchasing in addition, and make use of low pressure natural gas, middle pressure rock gas, low pressure refrigerant, secondary middle pressure refrigerant and middle pressure refrigerant and LNG heat exchange step by step, achieve the utilization step by step of LNG cold energy;
2, the Rankine cycle of refrigerant medium of the present invention, can adopt hydrocarbon mixture as refrigerant, makes the gasification curve of the liquefaction curve of coolant media and LNG as far as possible close, reduces exergy loss in cold energy callback course, improves generating efficiency;
3, the recycling of low temperature exhaust heat, by the low temperature exhaust heat drawing-in system of plant gas, is used for heated natural gas and refrigerant medium, improves the temperature that rock gas and low temperature refrigerant medium enter turbo-expander, thus improves the generating efficiency of system.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device in embodiment can describe according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Last it is noted that above embodiment is only in order to illustrate technological scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technological scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technological scheme.
Claims (4)
1. the system utilizing cold energy of liquefied natural gas to generate electricity, it is characterized in that, comprise: the first LNG pump, the second LNG pump, the 3rd LNG pump, low pressure natural gas condenser, middle pressure rock gas condenser, low pressure refrigerant condenser, first liquid refrigerant pump, second liquid refrigerant pump, the 3rd liquid coolant pump, refrigerant vaporizer, high-pressure natural gas heater, high-pressure natural gas superheater, refrigerant decompressor, Natural gas expander, secondary middle pressure refrigerant condenser and middle pressure refrigerant condenser, wherein:
Described low pressure natural gas condenser is connected with described first LNG pump, described second LNG pump, described Natural gas expander respectively, the low temperature LNG entered in it is pressurized to the high pressure LNG that 9 ~ 10MPa obtains and sends into described low pressure natural gas condenser by described first LNG pump, the low pressure NG that its end is discharged is sent into described low pressure natural gas condenser by described Natural gas expander, this high pressure LNG and this low pressure NG carries out heat exchange in described low pressure natural gas condenser, and this low pressure NG after heat exchange is liquefied as low pressure LNG and enters described second LNG pump supercharging;
Described middle pressure rock gas condenser is connected with three-way valve, described Natural gas expander, described 3rd LNG pump respectively, high pressure LNG after the heat exchange of described low pressure natural gas condenser enters described middle pressure rock gas condenser with the liquid NG after described second LNG pump supercharging after three-way valve converges, the middle pressure NG that described Natural gas expander is extracted out enters described middle pressure rock gas condenser, mixed high pressure LNG and the middle NG of pressure carries out heat exchange in described middle pressure rock gas condenser, and the middle pressure NG after heat exchange is liquefied as middle pressure LNG and enters described 3rd LNG pump supercharging;
Described low pressure refrigerant condenser respectively with three-way valve, described refrigerant decompressor, described first liquid refrigerant pump is connected, high pressure LNG after the heat exchange of described middle pressure rock gas condenser enters described low pressure refrigerant condenser with the liquid NG after described 3rd LNG pump supercharging after three-way valve converges, the low-pressure gas refrigerant that described refrigerant decompressor exports enters described low pressure refrigerant condenser, mixed high pressure LNG and low-pressure gas refrigerant carry out heat exchange in described low pressure refrigerant condenser, high pressure LNG gasifies and produces high pressure NG, low-pressure gas refrigerant absorbs cold liquefaction and is low pressure liquid refrigerant and enters the supercharging of described first liquid refrigerant pump,
In described time pressure refrigerant condenser respectively with described low pressure refrigerant condenser, described first liquid refrigerant pump, described refrigerant decompressor, described second liquid refrigerant pump is connected, high pressure NG after gasification enters pressure refrigerant heat exchanger in described time, highly pressurised liquid refrigerant after the supercharging of described first liquid refrigerant pump enters pressure refrigerant condenser in described time, the secondary medium pressure refrigerant gas that described refrigerant decompressor exports enters pressure refrigerant condenser in described time, low pressure liquid refrigerant after high pressure NG and supercharging, secondary medium pressure refrigerant gas generation heat exchange, secondary medium pressure refrigerant gas absorbs cold energy liquefaction and is time middle press liquid refrigerant and enters the supercharging of described second liquid refrigerant pump,
Described middle pressure refrigerant condenser respectively with three-way valve, pressure refrigerant condenser in described time, described refrigerant decompressor, described 3rd liquid coolant pump is connected, secondary middle press liquid refrigerant after the supercharging of described second liquid refrigerant pump with from described time, to press refrigerant condenser out, low pressure liquid refrigerant after supercharging enters described middle pressure refrigerant condenser after three-way valve converges, medium pressure refrigerant gas is sent into described middle pressure refrigerant condenser by described refrigerant decompressor, the mixed solution of the secondary middle press liquid refrigerant from described time after pressure refrigerant condenser high pressure NG out and supercharging and the low pressure liquid refrigerant after supercharging, medium pressure refrigerant gas carries out heat exchange in described middle pressure refrigerant condenser, become middle press liquid refrigerant after medium pressure refrigerant gas heat exchange to enter described 3rd liquid coolant pump and carry out supercharging,
Described refrigerant vaporizer is connected with three-way valve, described refrigerant decompressor, after three-way valve converges, enter described refrigerant vaporizer from described middle pressure refrigerant condenser highly pressurised liquid refrigerant out with press liquid refrigerant after supercharging, heating and gasifying is that gaseous state enters the acting of described refrigerant decompressor;
Described high-pressure natural gas heater is connected with described middle pressure refrigerant condenser, described high-pressure natural gas superheater respectively, described high-pressure natural gas heater is entered from the high pressure NG after the heat exchange out of described middle pressure refrigerant condenser, go to gas distributing system with heat medium water heat exchange rear portion, a part is gone to and is sent to described Natural gas expander after high-pressure natural gas superheater heats further and carries out circulating generation.
2. system according to claim 1, is characterized in that, described refrigerant vaporizer, described high-pressure natural gas heater and described high-pressure natural gas superheater adopt heat medium water heat exchange.
3. system according to claim 2, it is characterized in that, also comprise the heat exchanger of heat medium water and cigarette factory gas, from the heat exchanger of described heat medium water and cigarette factory gas out enter described refrigerant vaporizer with the heat medium water after flue gas heat exchange respectively by three-way valve, described high-pressure natural gas superheater carries out heat exchange, from described refrigerant vaporizer, enter described high-pressure natural gas heater after described high-pressure natural gas superheater heat medium water is out converged by three-way valve and carry out heat exchange, the heat exchanger entering described heat medium water and cigarette factory gas from described high-pressure natural gas heater heat medium water out further carries out thermal cycle.
4. system according to claim 1, is characterized in that, the refrigerant adopted is hydrocarbon mixture.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545391A (en) * | 2016-02-05 | 2016-05-04 | 新地能源工程技术有限公司 | Process and device for generating power through LNG cold energy |
| CN108331627A (en) * | 2018-03-09 | 2018-07-27 | 江苏中圣压力容器装备制造有限公司 | A kind of method and system of single cycle twin-stage LNG cold energy generations and ice making |
| CN110185506A (en) * | 2019-05-27 | 2019-08-30 | 西南石油大学 | A kind of natural gas pressure regulating station pressure energy utilization system |
| CN110847989A (en) * | 2019-11-15 | 2020-02-28 | 中国科学院理化技术研究所 | Cold energy utilization system |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060185367A1 (en) * | 2005-02-23 | 2006-08-24 | Kabushiki Kaisha Toshiba | LNG power plant and operation method thereof |
| CN102996378A (en) * | 2012-12-03 | 2013-03-27 | 中国石油大学(北京) | Generating method utilizing hydrocarbon mixture as working medium to recover liquefied natural gas cold energy |
| CN103075250A (en) * | 2012-11-08 | 2013-05-01 | 暨南大学 | Method for generating by graded use of cold energy of liquefied natural gas |
| CN204238992U (en) * | 2014-10-22 | 2015-04-01 | 中国寰球工程公司 | A kind of system utilizing cold energy of liquefied natural gas to generate electricity |
-
2014
- 2014-10-22 CN CN201410567493.7A patent/CN104373165A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060185367A1 (en) * | 2005-02-23 | 2006-08-24 | Kabushiki Kaisha Toshiba | LNG power plant and operation method thereof |
| CN103075250A (en) * | 2012-11-08 | 2013-05-01 | 暨南大学 | Method for generating by graded use of cold energy of liquefied natural gas |
| CN102996378A (en) * | 2012-12-03 | 2013-03-27 | 中国石油大学(北京) | Generating method utilizing hydrocarbon mixture as working medium to recover liquefied natural gas cold energy |
| CN204238992U (en) * | 2014-10-22 | 2015-04-01 | 中国寰球工程公司 | A kind of system utilizing cold energy of liquefied natural gas to generate electricity |
Non-Patent Citations (4)
| Title |
|---|
| 杨红昌: "《液化天然气（LNG）冷能发电系统的优化研究》", 《北京理工大学硕士学位论文》 * |
| 熊永强等: "《液化天然气冷量利用的集成优化》", 《华南理工大学学报（自然科学版）》 * |
| 王弢: "《利用LNG冷能的朗肯循环适用工质的理论研究》", 《上海交通大学硕士学位论文》 * |
| 舒丹、孙恒: "《混合工质回热朗肯循环回收天然气冷量的模拟》", 《化学工程》 * |
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| CN105545391A (en) * | 2016-02-05 | 2016-05-04 | 新地能源工程技术有限公司 | Process and device for generating power through LNG cold energy |
| CN105545391B (en) * | 2016-02-05 | 2017-05-31 | 新地能源工程技术有限公司 | Using the technique and device of LNG cold energy generations |
| CN108331627A (en) * | 2018-03-09 | 2018-07-27 | 江苏中圣压力容器装备制造有限公司 | A kind of method and system of single cycle twin-stage LNG cold energy generations and ice making |
| CN108331627B (en) * | 2018-03-09 | 2023-04-28 | 江苏中圣压力容器装备制造有限公司 | Single-cycle two-stage LNG cold energy power generation and ice making method and system |
| 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 |
| CN110185506A (en) * | 2019-05-27 | 2019-08-30 | 西南石油大学 | A kind of natural gas pressure regulating station pressure energy utilization system |
| CN110847989A (en) * | 2019-11-15 | 2020-02-28 | 中国科学院理化技术研究所 | Cold energy utilization system |
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