CN102996378B - Generating method utilizing hydrocarbon mixture as working medium to recover liquefied natural gas cold energy - Google Patents
Generating method utilizing hydrocarbon mixture as working medium to recover liquefied natural gas cold energy Download PDFInfo
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- CN102996378B CN102996378B CN201210510111.8A CN201210510111A CN102996378B CN 102996378 B CN102996378 B CN 102996378B CN 201210510111 A CN201210510111 A CN 201210510111A CN 102996378 B CN102996378 B CN 102996378B
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Abstract
The invention relates to a generating method utilizing a hydrocarbon mixture as a working medium to recover liquefied natural gas cold energy. The method comprises the following steps of: entering a mixed working medium and liquefied natural gas after boosting to a heat exchanger to carry out heat transfer; boosting the mixed working medium after heat transfer, then, returning to the heat exchanger so as to carry out heat transfer again, and entering the mixed working medium after heat transfer again to a turboexpander to carry out expansion apply work so as to drive a generator to generate electricity; and returning the mixed working medium passing through the turboexpander to the heat exchanger so as to carry out next circulation, outputting liquefied natural gas after heat transfer, and outward delivering or supplying gas. The invention also provides a generating system utilizing the hydrocarbon mixture as the working medium to recover the liquefied natural gas cold energy, which is used for the method. The method provided by the invention is a power cycle process flow for generating electricity; and an LNG (liquefied natural gas) is utilized as a lower-temperature heat source, surrounding environment and industrial exhaust heat and the like are utilized as high-temperature heat sources, and the energy such as cold energy of the LNG is recovered so as to generate mechanical energy to drive the generator to generate electric power.
Description
Technical field
The present invention relates to a kind of method taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating, belong to liquefaction Technology of Natural Gas field.
Background technique
The technology that utilizes of the cold energy of general LNG Liquefied natural gas (LNG) comprises LNG generating, air separation, freezer low-temperature receiver, desalination of sea water, lighter hydrocarbons separation, cold drying etc.Cold energy generation technology, as one of LNG cold energy use major way, plays an important role.Utilizing the basic principle of LNG cold energy generation to be generally by a cryogenic power generation cycle process, is low temperature cold source with LNG, and the mechanical work utilizing cryogenic power generation cycle to produce drives generator set to produce electric power.How obtaining higher cold energy use efficiency is wherein important technical problem, has multiple method be disclosed in this technical field.
201120294959.2 a number utility model patent discloses a kind of LNG cold energy level Four recycling system.This system adopts the Rankine cycle of two-stage cascade formula to produce electric power, and be in series by two separate low temperature Rankine cycles, technological process is comparatively complicated.
200910047533.4 number application for a patent for invention discloses and a kind ofly utilizes temperature-difference power generation module of LNG cold energy and preparation method thereof.The technological scheme that this patent application adopts based on principle diverse with power cycle, employing be thermoelectricity thermoelectric generation.Owing to directly utilizing the latent heat of LNG or sensible heat and air or water heat exchange to be infeasible in low temperature central air-conditioning system and freezer, so, in the middle of technological scheme disclosed in this patent application needs, cool storage medium reduces heat-exchange temperature, adopts thermoelectricity thermo-electric generation.Low temperature temperature-difference power generation module is arranged on the temperature difference pipeline of this system, between the import and export pipeline as heat exchanger.This temperature-difference power generation module adopts full static heat electric material thermo-electric generation mode, has simple, movement-less part, conveniently carries out the advantages such as series and parallel connections combination.
200720007870.7 a number utility model patent discloses a kind of LNG cold energy cascade integration and utilizes system.This system is a kind of LNG cold energy gradient, integrated utilization system, comprises cold energy service company, freezer company, icerink and four, cooling water air conditioner control zone part, can realize cold energy step, utilize fully.This system is a kind of step cold energy use scheme of LNG cold energy, and only some is used for producing electric power LNG cold energy, and this some electrical power is working medium with butane, utilizes a butane Rankine cycle that the cold energy of LNG is converted into electric energy.
201210112919.0 number application for a patent for invention discloses a kind of fuel cell based on LNG cold energy use and organic Rankine bottoming cycle combined generating system.Technological scheme disclosed in this patent application is also a kind of step cold energy use scheme of LNG cold energy, only some is used for producing electric power LNG cold energy, this some electrical power be with a certain organic substance for working medium, utilize Rankine cycle reclaim the cold energy of LNG and the waste heat of flue gas and be converted into electric energy.
No. 201120294858.5 utility model patents disclose a kind of multistage recycling system of LNG cold energy being applicable to boats and ships.This system is the LNG cold energy Multi-class propagation system being applicable to boats and ships.The combining form of what power generation part in this system adopted the is Rankine cycle of two-stage cascade formula and rock gas expansion cycle, wherein Rankine cycle is in series by two separate low temperature Rankine cycles, and technological process is comparatively complicated.
201010123728.5 number application for a patent for invention discloses a kind of integrated optimization method improving generation efficiency of liquefied natural gas cold energy.The method is also a kind of step cold energy use scheme of LNG cold energy, and wherein cold energy generation part is made up of basic single-stage Rankine cycle and rock gas expansion cycle.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of method taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating, it is by adopting hydrocarbon mixture to reclaim cold energy as working medium, only adopts one-level Rankine cycle just can obtain very high generating efficiency.
The present invention also aims to provide a kind of system taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating.
For achieving the above object, the present invention provide firstly a kind of method taking hydrocarbon mixture as working medium and reclaim LNG cold energy generation, and it comprises the following steps:
(1) make mixed working fluid and the LNG Liquefied natural gas through boosting enter heat exchanger and carry out heat exchange (or claiming first time heat exchange);
(2) mixed working fluid through heat exchange boosts, and then get back to heat exchanger and carry out heat exchange again (or claiming second time heat exchange), the mixed working fluid again after heat exchange enters turbo-expander expansion work and drive electrical generators generating;
(3) get back to heat exchanger through the mixed working fluid of turbo-expander and carry out next one circulation;
(4) LNG Liquefied natural gas through heat exchange is exported, outwards to carry or air feed.
The method with hydrocarbon mixture being working medium reclaims cold energy of liquefied natural gas generating provided by the present invention is that persistent loop carries out, and wherein, mixed working fluid carries out continuous print circulation always, and LNG Liquefied natural gas to be also lasting input heat exchanger carry out heat exchange.Said method can be called again the circulation recovery method of the cold energy of LNG Liquefied natural gas.
According to specific embodiment of the invention scheme, preferably, in the above-mentioned methods, with molar percent, the mixed working fluid adopted comprises following one-tenth and is grouped into: methane 20%-40%, ethane or ethene 35%-55%, propane 20-35%, each composition sum meets 100%; More preferably, with molar percent, mixed working fluid comprises following one-tenth and is grouped into: methane 23%-30%, ethane or ethene 40%-50%, propane 23-32%, and each composition sum meets 100%.Undertaken adjusting the requirement that can adapt to defeated outside different its natural gas liquid, pressure, rock gas or supply gas pressure etc. by being grouped into the one-tenth of mixed working fluid, the heat exchange loss of heat exchanger can be reduced so as far as possible, improve the efficiency of whole technological process, produce more electric power.
According to specific embodiment of the invention scheme, preferably, in step (2), through the pressure of pressure needed for 8-15MPa or conveying or air feed of the LNG Liquefied natural gas of boosting.Needed for conveying or air feed, pressure depends on the requirement of receiving station, generally matches with the ductwork pressure of outside, station.
According to specific embodiment of the invention scheme, preferably, in upper step (2), the pressure of mixed working fluid before boosting through heat exchange (first time heat exchange) is 105-300kPa, is preferably 120-150kPa.
According to specific embodiment of the invention scheme, preferably, in upper step (2), the pressure of mixed working fluid after boosting through heat exchange (first time heat exchange) is 800-3000kPa, is preferably 1000-1800kPa.
According to specific embodiment of the invention scheme, preferably, in upper step (2), the temperature through the LNG Liquefied natural gas of heat exchange (first time heat exchange) is-80 DEG C to 30 DEG C, is preferably-60 DEG C to-15 DEG C.
According to specific embodiment of the invention scheme, preferably, in upper step (2), the temperature through the mixed working fluid of heat exchange (first time heat exchange) is-160 DEG C to-100 DEG C, is preferably-150 DEG C to-110 DEG C.
According to specific embodiment of the invention scheme, preferably, in upper step (2), the temperature through the mixed working fluid of heat exchange again (second time heat exchange) is-90 DEG C to-30 DEG C, is preferably-60 DEG C to-35 DEG C.
In said method provided by the invention, higher efficiency can be obtained by control temperature, generally that the flow of such as air, the temperature of refrigerant, flow etc., concrete control mode can be carried out with reference to existing method by controlling to carry out with it the temperature of the medium of heat exchange and flow carries out.
According to specific embodiment of the invention scheme, preferably, in upper step (4), the LNG Liquefied natural gas through heat exchange leaving heat exchanger first carries out heat exchange with refrigerant, and then exports; Or, the LNG Liquefied natural gas through heat exchange leaving heat exchanger first with refrigerant heat exchange, then with external environment or industrial exhaust heat heat exchange, enter turbo-expander expansion work more afterwards and drive electrical generators generating, and then export.In said method provided by the invention, the flow process of LNG can be: after LNG is promoted to pressure (can be boosted by LNG pump) needed for outwards conveying or air feed, enter heat exchanger and mixed working fluid heat exchange and heated, outwards to be carried or air feed after air-conditioning provides cold by the refrigerant heat exchange with routine afterwards, or from heat exchanger out after directly to outer conveying or air feed; Above-mentioned flow process also can be: LNG first increases to a very high pressure, be generally 8MPa to 15MPa, enter heat exchanger again vaporize and heat up, then carry out heat exchange with conventional refrigerant and provide cold to air-conditioning, and then with environment or industrial exhaust heat heat exchange, enter Natural gas expander expansion work afterwards, rock gas is depressurized to the backward outer conveying of pressure or air feed needed for outwards conveying or air feed, wherein, the mechanical work that Natural gas expander produces also may be used for generating.
In the above-mentioned methods, the mixed working fluid of gaseous state enters the cold energy that heat exchanger absorbs LNG through heat exchange (first time heat exchange) and is condensed into liquid, after pressurization, enter heat exchanger again carry out heat exchange (second time heat exchange) and heated (can being liquid state after heating, gas or gas-liquid two-phase, be generally gas-liquid two-phase), enter turbo-expander expansion work (also can be introduced into after another heat exchanger heats (or claiming third time heat exchange) further and enter turbo-expander expansion work again) afterwards, drive electrical generators produces electric power, get back to heat exchanger from decompressor gaseous state mixed working fluid out and complete circulation.In step (2), preferably, mixed working fluid again after heat exchange first carries out heat exchange (third time heat exchange) with one or more in external environment, refrigerant and industrial exhaust heat, and then enters turbo-expander expansion work and drive electrical generators generating.This third time heat exchange can in the following ways: another heat exchanger, carry out heat exchange through the mixed working fluid of heat exchange again from heat exchanger with surrounding environment, here both heat exchange can be carried out with air with surrounding environment heat exchange, also can using water as intermediary, make mixed working fluid and water first carry out heat exchange, water is again with air heat-exchange or be disposed to beyond factory; Or, heat exchange (wherein refrigerant can adopt water, salt solution, ethylene glycol, propylene glycol, glycerine etc. conventional air-conditioning system) is first carried out with refrigerant through the mixed working fluid of heat exchange again from heat exchanger, mixed working fluid is heated, the cold discharged passes to refrigerant, and transmits cold via refrigerant to air-conditioning system.
According to specific embodiment of the invention scheme, preferably, the third time heat exchange of mixed working fluid can be carried out according to following steps: first carry out heat exchange to-10 DEG C to 10 DEG C with refrigerant from the heat exchanger mixed working fluid through heat exchange again out, heat exchange is carried out again with external environment condition, recycling industrial exhaust heat is heated to 40 DEG C to 150 DEG C, then enters turbo-expander; Wherein, preferably utilize industrial exhaust heat to be heated to 40 DEG C to 90 DEG C, be more preferably 50 DEG C to 80 DEG C.
In said method provided by the invention, the heat exchanger realizing the heat exchange (first time heat exchange, second time heat exchange) of mixed working fluid and LNG can be any type of cryogenic heat exchanger, such as, as long as the heat exchange of three fluid streams can be realized and makes it reach temperature required separately, plate and fin type cryogenic heat exchanger etc.The heat exchanger that the heat exchange (third time heat exchange) of mixed working fluid and external environment, refrigerant, industrial exhaust heat adopts also can any type of heat exchanger that can realize above-mentioned heat exchange.
Present invention also offers a kind of system taking hydrocarbon mixture as working medium and reclaim LNG cold energy generation, it comprises: First Heat Exchanger, mixed working fluid pump, liquefied natural gas pump, turbo-expander, generator, rock gas input pipeline, rock gas output pipeline; Wherein:
First Heat Exchanger has first flow, the second runner, the 3rd runner, and the entrance of first flow is communicated with rock gas input pipeline, and the outlet of first flow is communicated with rock gas output pipeline, and LNG Liquefied natural gas input pipeline is provided with liquefied natural gas pump;
The outlet of turbo-expander is communicated with the entrance of the 3rd runner, and the outlet of the 3rd runner is communicated with the entrance of mixed working fluid pump, and mixed working fluid delivery side of pump is communicated with the entrance of the second runner, and the outlet of the second runner is communicated with the entrance of turbo-expander;
Generator is connected with turbo-expander, for generating electricity under the drive of turbo-expander.
In said system, preferably, the pipeline between the outlet of the second runner and the entrance of turbo-expander is provided with at least one heat exchanger and/or rock gas output pipeline is provided with at least one heat exchanger.That is, in said system, the pipeline between the outlet of the second runner and the entrance of turbo-expander can be provided with at least one heat exchanger, for realizing the third time heat exchange of mixed working fluid and external environment, refrigerant, industrial exhaust heat etc.; Rock gas output pipeline also can be provided with at least one heat exchanger, for realizing the heat exchange of rock gas and refrigerant.In same system, the one in above-mentioned two kinds of heat exchangers both can be set separately, this two kinds of heat exchangers also can be set simultaneously.
In said system, the First Heat Exchanger realizing the heat exchange (first time heat exchange, second time heat exchange) of mixed working fluid and LNG can be any type of cryogenic heat exchanger, as long as the heat exchange of three fluid streams can be realized and make it reach temperature required separately, preferably, above-mentioned First Heat Exchanger is plate and fin type cryogenic heat exchanger.
The heat exchanger that the heat exchange (third time heat exchange) of mixed working fluid and external environment, refrigerant, industrial exhaust heat adopts also can any type of heat exchanger that can realize above-mentioned heat exchange.
In said system, preferably, the pipeline between the outlet of the second runner and the entrance of turbo-expander is provided with two heat exchangers.One is carried out heat exchange for making mixed working fluid and refrigerant, and another heat exchanger is used for making mixed working fluid and external environment or industrial exhaust heat carry out heat exchange, and wherein, mixed working fluid first heats up with refrigerant heat exchange, and then heats up with external environment condition or industrial exhaust heat heat exchange.
In said system, preferably, rock gas output pipeline is provided with two heat exchangers.A heat exchanger is used for making rock gas and refrigerant heat exchange, and another heat exchanger is used for making rock gas and external environment or industrial exhaust heat carry out heat exchange, and wherein, rock gas is general first to heat up with refrigerant heat exchange, and then heats up with external environment condition or industrial exhaust heat heat exchange.
In said system, 3rd runner of First Heat Exchanger, mixed working fluid pump, the second runner, the second heat exchanger, turbo-expander form the circulation loop of mixed working fluid, and the first flow of rock gas input pipeline, First Heat Exchanger, rock gas output pipeline form the passage of rock gas.
The method with hydrocarbon mixture being working medium reclaims cold energy of liquefied natural gas generating provided by the invention be a kind of take hydrocarbon mixture as working medium, technological process by recovery waste heat and LNG cold energy generation, it can only adopt one-level refrigeration cycle to realize, there is flow process simple, the feature that energy efficiency is higher.The method be a kind of can in order to generating power cycle technological process, with the LNG of low temperature for low-temperature heat source, using surrounding environment, industrial exhaust heat etc. as high temperature heat source, by reclaiming the cold energy of LNG, the low grade heat energy homenergic of industrial exhaust heat produces mechanical energy and drive electrical generators produces electric power.In the method, by the proportioning of Reasonable adjustment mixed working fluid, very high cold energy use efficiency can be obtained, and, the method may be used solely to generating, also can with LNG direct expansion electrification technique as well as conbined usage.
Accompanying drawing explanation
What Fig. 1 provided for embodiment 1 take hydrocarbon mixture as the structural representation of system that working medium reclaims cold energy of liquefied natural gas generating;
What Fig. 2 provided for embodiment 2 take hydrocarbon mixture as the structural representation of system that working medium reclaims cold energy of liquefied natural gas generating;
What Fig. 3 provided for embodiment 4 take hydrocarbon mixture as the structural representation of system that working medium reclaims cold energy of liquefied natural gas generating.
Main Reference label declaration:
First Heat Exchanger 1 mixed working fluid pump 2 second heat exchanger 3 first turbo-expander 4 generator 5 liquefied natural gas pump 6 rock gas input pipeline 7 rock gas output pipeline 8 the 3rd heat exchanger 9 the 4th heat exchanger 10 the 5th heat exchanger 11 second turbo-expander 12
Embodiment
In order to there be understanding clearly to technical characteristics of the present invention, object and beneficial effect, existing following detailed description is carried out to technological scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment 1
Present embodiments provide a kind of system taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating, its structure as shown in Figure 1.This system comprises First Heat Exchanger 1, mixed working fluid pump 2, second heat exchanger 3, first turbo-expander 4, generator 5, liquefied natural gas pump 6, rock gas input pipeline 7, rock gas output pipeline 8, wherein:
First Heat Exchanger 1 is plate and fin type cryogenic heat exchanger, it has three runners, be followed successively by first flow, the second runner, the 3rd runner in FIG from right to left, the entrance of first flow is communicated with rock gas input pipeline 7, the outlet of first flow is communicated with rock gas output pipeline 8, further, rock gas input pipeline 7 is provided with liquefied natural gas pump 6;
The outlet of the first turbo-expander 4 is communicated with the entrance of the 3rd runner, the outlet of the 3rd runner is communicated with the entrance of mixed working fluid pump 2, the outlet of mixed working fluid pump 2 is communicated with the entrance of the second runner, and the outlet of the second runner is communicated with the entrance of the first turbo-expander 4;
Generator 5 is connected with the first turbo-expander 4, for generating electricity under the drive of turbo-expander 4.
In above-mentioned recirculation system, 3rd runner of First Heat Exchanger 1, mixed working fluid pump 2, second runner, the second heat exchanger 3, first turbo-expander 4 form the circulation loop of mixed working fluid, and the first flow of rock gas input pipeline 7, First Heat Exchanger 1, rock gas output pipeline 8 form the passage of rock gas.
The present embodiment additionally provides a kind of method taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating, and it adopts said system to carry out, and specifically comprises the following steps:
The LNG inputted by rock gas input pipeline 7 is promoted to after pressure needed for outwards conveying or air feed through liquefied natural gas pump 6, and the first flow entering First Heat Exchanger 1 carries out heat exchange and heated, then by rock gas output pipeline 8 outwards conveying or air feed;
The 3rd runner that the mixed working fluid of gaseous state enters First Heat Exchanger 1 absorbs LNG cold energy and is condensed into liquid, the the second runner heating entering First Heat Exchanger 1 after mixed working fluid pump 2 pressurizes again (can for liquid after heating, gas or gas-liquid two-phase, be generally gas-liquid two-phase), enter the second heat exchanger and air (i.e. external environment) heat exchange afterwards, the first turbo-expander 4 expansion work is entered after mixed working fluid temperature, drive electrical generators 5 produces electric power, the 3rd runner getting back to First Heat Exchanger 1 from the first turbo-expander 4 gaseous state mixed working fluid out completes a circulation, enter next circulation.
Embodiment 2
Present embodiments provide a kind of system taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating, its structure as shown in Figure 2.This system be embodiment 1 provide with hydrocarbon mixture be working medium reclaim cold energy of liquefied natural gas generating system basis on the pipeline between second runner exit and the entrance of the second heat exchanger 3 of First Heat Exchanger 1, add the 3rd heat exchanger 9, rock gas output pipeline 8 adds the 4th heat exchanger 10, and other are identical with embodiment 1.
The present embodiment additionally provides a kind of method taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating, and it is that the said system adopting the present embodiment to provide is carried out, and specifically comprises the following steps:
The LNG inputted by rock gas input pipeline 7 is promoted to after pressure needed for outwards conveying or air feed through liquefied natural gas pump 6, the first flow entering First Heat Exchanger 1 carries out heat exchange and is heated, afterwards by carrying out heat exchange with ethylene glycol (refrigerant) in the 4th heat exchanger 10, cold is passed to ethylene glycol and provides cold by ethylene glycol to air-conditioning again, then by rock gas output pipeline 8 outwards conveying or air feed;
The 3rd runner that the mixed working fluid of gaseous state enters First Heat Exchanger absorbs LNG cold energy and is condensed into liquid, the the second runner heating entering First Heat Exchanger 1 after mixed working fluid pump 2 pressurizes again (can for liquid after heating, gas or gas-liquid two-phase, be generally gas-liquid two-phase), enter the 3rd heat exchanger 9 and ethylene glycol (refrigerant) heat exchange afterwards, cold is passed to ethylene glycol and provides cold by ethylene glycol to air-conditioning again, then mixed working fluid enters the second heat exchanger 3 and air heat-exchange again, mixed working fluid temperature rises to and enter the first turbo-expander 4 expansion work after ambient temperature 3-5 DEG C, drive electrical generators 5 produces electric power, the 3rd runner getting back to First Heat Exchanger 1 from the mixed working fluid of the first turbo-expander 4 gaseous state out completes a circulation, enter next circulation.
In this embodiment, the mixture that the mixed working fluid adopted is methane, ethene and propane form, wherein, with the molar percent of this mixed working fluid, the content of methane is 34%, and the content of ethene is 24%, and the content of propane is 42%.In this embodiment, LNG Liquefied natural gas per ton approximately can produce 47-51 degree electricity.
Embodiment 3
The present embodiment additionally provide a kind of with hydrocarbon mixture be working medium reclaim cold energy of liquefied natural gas generating method, its be adopt embodiment 2 provide with hydrocarbon mixture be working medium reclaim cold energy of liquefied natural gas generating system carry out, specifically comprise the following steps:
The LNG inputted by rock gas input pipeline 7 is promoted to after pressure needed for outwards conveying or air feed through liquefied natural gas pump 6, the first flow entering First Heat Exchanger 1 carries out heat exchange and is heated, afterwards by carrying out heat exchange with ethylene glycol (refrigerant) in the 4th heat exchanger 10, cold is passed to ethylene glycol and provides cold by ethylene glycol to air-conditioning again, then by rock gas output pipeline 8 outwards conveying or air feed;
The 3rd runner that the mixed working fluid of gaseous state enters First Heat Exchanger absorbs LNG cold energy and is condensed into liquid, the the second runner heating entering First Heat Exchanger 1 after mixed working fluid pump 2 pressurizes again (can for liquid after heating, gas or gas-liquid two-phase, be generally gas-liquid two-phase), enter the 3rd heat exchanger 9 and ethylene glycol (refrigerant) heat exchange afterwards, cold is passed to ethylene glycol and provides cold by ethylene glycol to air-conditioning again, then mixed working fluid enters the second heat exchanger 3 again and reclaims industrial exhaust heat, mixed working fluid temperature enters the first turbo-expander 4 expansion work after rising to 50-80 DEG C, drive electrical generators 5 produces electric power, the 3rd runner getting back to First Heat Exchanger 1 from the mixed working fluid of the first turbo-expander 4 gaseous state out completes a circulation, enter next circulation.
In this embodiment, the mixture that the mixed working fluid adopted is methane, ethene and propane form, wherein, with the molar percent of this mixed working fluid, the content of methane is 28%, and the content of ethene is 38%, and the content of propane is 34%.In this embodiment, LNG Liquefied natural gas per ton approximately can produce 58-63 degree electricity.
Embodiment 4
Present embodiments provide a kind of system taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating, its structure as shown in Figure 3.This system be embodiment 2 provide with hydrocarbon mixture be working medium reclaim the system of cold energy of liquefied natural gas generating basis on turn increase one the 5th heat exchanger 11 and the second turbo-expander 12 outside the 4th heat exchanger 10 on rock gas output pipeline 8, other are identical with embodiment 2.
The present embodiment additionally provides a kind of method taking hydrocarbon mixture as working medium and reclaim cold energy of liquefied natural gas generating, and it is that the said system adopting the present embodiment to provide is carried out, and specifically comprises the following steps:
The LNG inputted by rock gas input pipeline 7 is after liquefied natural gas pump 6 boosts to 10MPa, the first flow entering First Heat Exchanger 1 carries out heat exchange and is heated, afterwards by carrying out heat exchange with ethylene glycol (refrigerant) in the 4th heat exchanger 10, cold is passed to ethylene glycol and provides cold by ethylene glycol to air-conditioning again, rock gas rises to after lower than ambient temperature 3-5 DEG C with air heat-exchange at the 5th heat exchanger 11 more afterwards, enter the second rock gas turbo-expander 12 and be expanded to pressure needed for outer defeated or air feed, then by rock gas output pipeline 8 outwards conveying or air feed;
The 3rd runner that the mixed working fluid of gaseous state enters First Heat Exchanger absorbs LNG cold energy and is condensed into liquid, the the second runner heating entering First Heat Exchanger 1 after mixed working fluid pump 2 pressurizes again (can for liquid after heating, gas or gas-liquid two-phase, be generally gas-liquid two-phase), enter the 3rd heat exchanger 9 and ethylene glycol (refrigerant) heat exchange afterwards, cold is passed to ethylene glycol and provides cold by ethylene glycol to air-conditioning again, then mixed working fluid enters the second heat exchanger 3 and air heat-exchange again, mixed working fluid temperature rises to and enter turbo-expander 4 expansion work after ambient temperature 3-5 DEG C, drive electrical generators 5 produces electric power, the 3rd runner getting back to First Heat Exchanger 1 from the mixed working fluid of turbo-expander 4 gaseous state out completes a circulation, enter next circulation.
In this embodiment, the mixture that the mixed working fluid adopted is methane, ethane and propane form, wherein, with the molar percent of this mixed working fluid, the content of methane is 37.5%, and the content of ethene is 13%, and the content of propane is 49.5%.In this embodiment, LNG Liquefied natural gas per ton approximately can produce 62-67 degree electricity.
Embodiment 5
Present embodiments provide a kind of with hydrocarbon mixture be working medium reclaim cold energy of liquefied natural gas generating method, its be adopt embodiment 4 provide with hydrocarbon mixture be working medium reclaim cold energy of liquefied natural gas generating system carry out, specifically comprise the following steps:
The LNG inputted by rock gas input pipeline 7 is after liquefied natural gas pump 6 boosts to 10MPa, the first flow entering First Heat Exchanger 1 carries out heat exchange and is heated, afterwards by carrying out heat exchange with ethylene glycol (refrigerant) in the 4th heat exchanger 10, cold is passed to ethylene glycol and provides cold by ethylene glycol to air-conditioning again, and after rock gas intensification, entering the 5th heat exchanger 11 again utilizes industrial exhaust heat to be heated to 60-70 DEG C, enter the second turbo-expander 12 afterwards and be expanded to pressure needed for outer defeated or air feed, then by rock gas output pipeline 8 outwards conveying or air feed;
The 3rd runner that the mixed working fluid of gaseous state enters First Heat Exchanger absorbs LNG cold energy and is condensed into liquid, the the second runner heating entering First Heat Exchanger 1 after mixed working fluid pump 2 pressurizes again (can for liquid after heating, gas or gas-liquid two-phase, be generally gas-liquid two-phase), enter the 3rd heat exchanger 9 and ethylene glycol (refrigerant) heat exchange afterwards, cold is passed to ethylene glycol and provides cold by ethylene glycol to air-conditioning again, then mixed working fluid enters the second heat exchanger 3 and air heat-exchange again, mixed working fluid temperature rises to and enter turbo-expander 4 expansion work after ambient temperature 3-5 DEG C, drive electrical generators 5 produces electric power, the 3rd runner getting back to First Heat Exchanger 1 from the mixed working fluid of turbo-expander 4 gaseous state out completes a circulation, enter next circulation.
In this embodiment, the mixture that the mixed working fluid adopted is methane, ethane and propane form, wherein, with the molar percent of this mixed working fluid, the content of methane is 36%, and the content of ethene is 16%, and the content of propane is 48%.In this embodiment, LNG Liquefied natural gas per ton approximately can produce 85-90 degree electricity.
Claims (12)
1. be the method that working medium reclaims cold energy of liquefied natural gas generating with hydrocarbon mixture, it comprises the following steps:
Make mixed working fluid enter heat exchanger with the LNG Liquefied natural gas through boosting and carry out heat exchange;
Mixed working fluid through heat exchange boosts, and then gets back to heat exchanger and carries out heat exchange again, and the mixed working fluid again after heat exchange enters turbo-expander expansion work and drive electrical generators generating;
Get back to heat exchanger through the mixed working fluid of turbo-expander and carry out next one circulation;
LNG Liquefied natural gas through heat exchange is exported, outwards to carry or air feed;
The described LNG Liquefied natural gas through heat exchange leaving heat exchanger first with refrigerant heat exchange, then with external environment or industrial exhaust heat heat exchange, enter turbo-expander expansion work more afterwards and drive electrical generators generating, and then export;
Wherein, with molar percent, described mixed working fluid comprises following one-tenth and is grouped into: methane 20%-40%, ethane or ethene 35%-55%, propane 20-35%, and each composition sum meets 100%;
The pressure of mixed working fluid before boosting through heat exchange is 105-300kPa; The pressure of mixed working fluid after boosting through heat exchange is 800-3000kPa;
Temperature through the LNG Liquefied natural gas of heat exchange is-80 DEG C to 30 DEG C; The temperature of the mixed working fluid again after heat exchange is-90 DEG C to-30 DEG C; The temperature of the described mixed working fluid through heat exchange is-160 DEG C to-100 DEG C.
2. method according to claim 1, wherein, with molar percent, described mixed working fluid has following one-tenth and is grouped into: methane 23%-30%, ethane or ethene 40%-50%, propane 23-32%, and each composition sum meets 100%.
3. method according to claim 1, wherein, the described pressure of LNG Liquefied natural gas through boosting be 8-15MPa or, conveying or the pressure needed for air feed.
4. the method according to claim 1 or 3, wherein, the pressure of mixed working fluid before boosting through heat exchange is 120-150kPa; The pressure of mixed working fluid after boosting through heat exchange is 1000-1800kPa.
5. method according to claim 1, wherein, the temperature through the LNG Liquefied natural gas of heat exchange is-60 DEG C to-15 DEG C; The temperature of the mixed working fluid again after heat exchange is-60 DEG C to-35 DEG C; The temperature of the described mixed working fluid through heat exchange is-150 DEG C to-110 DEG C.
6. method according to claim 1 or 5, wherein, the mixed working fluid after described heat exchange again first carries out heat exchange with one or more in external environment, refrigerant and industrial exhaust heat, and then enters turbo-expander expansion work and drive electrical generators generating.
7. method according to claim 1, wherein, the mixed working fluid after described heat exchange again first carries out heat exchange to-10 DEG C to 10 DEG C with refrigerant, then carries out heat exchange with external environment condition, recycling industrial exhaust heat is heated to 40 DEG C to 150 DEG C, then enters turbo-expander.
8. method according to claim 6, wherein, the mixed working fluid after described heat exchange again first carries out heat exchange to-10 DEG C to 10 DEG C with refrigerant, then carries out heat exchange with external environment condition, recycling industrial exhaust heat is heated to 40 DEG C to 150 DEG C, then enters turbo-expander.
9. the method according to claim 7 or 8, wherein, utilizes industrial exhaust heat to be heated to 40 DEG C to 90 DEG C.
10. method according to claim 9, wherein, utilizes industrial exhaust heat to be heated to 50 DEG C to 80 DEG C.
11. 1 kinds is the system that working medium reclaims LNG cold energy generation with hydrocarbon mixture, and it comprises: First Heat Exchanger, mixed working fluid pump, liquefied natural gas pump, turbo-expander, generator, rock gas input pipeline, rock gas output pipeline; Wherein:
Described First Heat Exchanger has first flow, the second runner, the 3rd runner, the entrance of described first flow is communicated with described rock gas input pipeline, the outlet of described first flow is communicated with described rock gas output pipeline, further, described LNG Liquefied natural gas input pipeline is provided with liquefied natural gas pump;
The outlet of described turbo-expander is communicated with the entrance of described 3rd runner, the outlet of described 3rd runner is communicated with the entrance of described mixed working fluid pump, described mixed working fluid delivery side of pump is communicated with the entrance of described second runner, and the outlet of described second runner is communicated with the entrance of described turbo-expander;
Described generator is connected with described turbo-expander, for generating electricity under the drive of described turbo-expander;
Rock gas output pipeline is provided with two heat exchangers, and a heat exchanger is used for making rock gas and refrigerant heat exchange, and another heat exchanger is used for making rock gas and external environment or industrial exhaust heat carry out heat exchange.
12. systems according to claim 11, wherein, the pipeline between the outlet of described second runner and the entrance of described turbo-expander is provided with at least one heat exchanger and/or described rock gas output pipeline is provided with at least one heat exchanger.
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| EP3022410B1 (en) * | 2013-07-19 | 2021-04-21 | ITM Power (Research) Limited | Pressure reduction system |
| CN103362579A (en) * | 2013-08-08 | 2013-10-23 | 华北科技学院 | Two-stage expansion power generation device and method for recovering liquefied natural gas cold energy |
| CN104373165A (en) * | 2014-10-22 | 2015-02-25 | 中国寰球工程公司 | System for generating power through liquefied natural gas cold energy |
| CN104989473B (en) * | 2015-05-27 | 2016-10-19 | 上海交通大学 | A kind of electricity generation system and electricity-generating method based on this system |
| 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 |
| CN107556969B (en) * | 2016-06-30 | 2020-09-08 | 中石化洛阳工程有限公司 | Working medium for liquefied natural gas cold energy organic Rankine cycle power generation |
| CN109184837B (en) * | 2018-08-15 | 2021-02-09 | 江苏科技大学 | Fuel cold energy full-power generation cascade utilization system and method for LNG power ship |
| CN110847987B (en) * | 2019-12-24 | 2024-04-05 | 青岛中稷龙源能源科技有限公司 | LNG cold energy power generation and comprehensive utilization system and method for mixed working medium |
| CN114263511B (en) * | 2021-12-21 | 2024-01-26 | 西安石油大学 | Light hydrocarbon separation coupling parallel backheating organic Rankine cycle power generation system utilizing LNG cold energy |
| CN117052619B (en) * | 2023-10-11 | 2024-01-23 | 浙江博旭新能源科技有限公司 | LNG cold energy and photo-thermal hot water low-temperature heat energy combined power generation system and method |
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