CN104110939A - Liquefied natural gas cold energy recycling system - Google Patents
Liquefied natural gas cold energy recycling system Download PDFInfo
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- CN104110939A CN104110939A CN201310137057.1A CN201310137057A CN104110939A CN 104110939 A CN104110939 A CN 104110939A CN 201310137057 A CN201310137057 A CN 201310137057A CN 104110939 A CN104110939 A CN 104110939A
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- natural gas
- liquefied natural
- cold energy
- heat exchanger
- heater
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
- F25J3/0426—The cryogenic component does not participate in the fractionation
- F25J3/04266—The cryogenic component does not participate in the fractionation and being liquefied hydrocarbons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/04351—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
- F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a liquefied natural gas cold energy recycling system comprising an air separating device, a cold storage recovery device and a low-temperature power circulating device. The air separating device is serially connected to the cold storage recovery device and the low-temperature power circulating device. After the liquefied natural gas passes the air separating device, part of the liquefied natural gas enters the low-temperature power circulating device, and the retained part of the liquefied natural gas enters the cold storage recovery device; the air separating device is used for extracting the cold energy of the liquefied natural gas and utilizing the cold energy to liquefy and separate the air internal components; the low-temperature power circulating device is used for extracting the cold energy of the liquefied natural gas and converting the cold energy into other available energy; the cold storage recovery device is used for extracting the cold energy of the liquefied natural gas for a cold storage for usage. According to the system, after the liquefied natural gas passes the air separating device, part of the liquefied natural gas enters the low-temperature power circulating device for cold energy recycling, and part of the liquefied natural gas enters the cold storage recovery device for cold energy recycling; the cold energy can be recycled in a multistage manner, and the utilization rate is increased.
Description
Technical field
The present invention relates to energy-saving and emission-reduction field, particularly a kind of cold energy of liquefied natural gas recycling system.
Background technology
Natural gas is as one of the world's three large energy pillars, and in energy resource structure, proportion surpasses 24%, and with advantages such as its environmental protection, safety, this year, its consumption figure sharply rose.China is the big country of coal more than, few oil, lean gas, in lasting economic development, faces the severe situation that natural gas is in short supply, and this is just in the urgent need in a large amount of natural gas importer abroad.In order better to tackle transportation and the storage problem of natural gas, LNG(Liquefied Natural Gas liquefied natural gas) development is rapidly.
In the outside course of conveying of LNGCong receiving station, need first LNG to be gasified, and cold energy in LNG is along with gasification discharges simultaneously, approximately can reach 830-860kJ/kg, cold energy refers in normal temperature environment, naturally the low temperature heat energy existing, in fact refers under field conditions (factors), can utilize the resulting energy of a fixed difference difference; At present, due to reasons such as equipment, environment, cause this part cold energy conventionally with seawater or air stream, to lose, lack and recycle.
In realizing process of the present invention, inventor finds that prior art at least exists following problem:
The loss of a large amount of LNG cold energy, not only causes the significant wastage of the energy, make to produce the cost utilizing higher, and the cold energy running off also causes pollution to a certain degree to environment.
Summary of the invention
In order to solve the problem that in prior art LNG, cold energy runs off, the embodiment of the present invention provides a kind of cold energy of liquefied natural gas recycling system.Described technical scheme is as follows:
A kind of cold energy of liquefied natural gas recycling system, described recycling system comprises: air-separating plant, freezer retracting device and cryogenic power generation cycle device, described air-separating plant respectively with described freezer retracting device, described cryogenic power generation cycle device series connection, liquefied natural gas is by after described air-separating plant, described liquefied natural gas partly enters described cryogenic power generation cycle device, the remainder of described liquefied natural gas enters described freezer retracting device, described air-separating plant is for extracting the cold energy of described liquefied natural gas, and by this cold energy, the liquefaction of inside air composition is separated, described cryogenic power generation cycle device is for extracting the cold energy of described liquefied natural gas, and this cold energy is converted into other applicable energy, described freezer retracting device uses for freezer for extracting the cold energy of described liquefied natural gas.
Particularly, as preferably, described air-separating plant comprises: air compressor machine, cooler, First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger and air separation column, described air compressor machine, described the 3rd heat exchanger, described cooler, described First Heat Exchanger is connected in turn with described air separation column, air is through described air compressor machine, described the 3rd heat exchanger, described cooler, described First Heat Exchanger and described air separation column liquefy separated, described First Heat Exchanger is also connected with described the second heat exchanger separately from beginning to end, described the second heat exchanger respectively with described freezer retracting device, described cryogenic power generation cycle device connects, described liquefied natural gas flows into respectively described freezer retracting device and described cryogenic power generation cycle device through described the second heat exchanger, described the second heat exchanger is for extracting the cold energy of described liquefied natural gas and this cold energy being transferred to described First Heat Exchanger.
As preferably, described cold energy of liquefied natural gas recycling system also comprises flow regulator, described flow regulator is arranged between described the second heat exchanger and described cryogenic power generation cycle device, and described flow regulator is for regulating described liquefied natural gas to flow into the flow proportional of described cryogenic power generation cycle device and described freezer retracting device.
Further, described cold energy of liquefied natural gas recycling system also comprises compressor, described compressor is arranged between described First Heat Exchanger and described the second heat exchanger, described compressor is connected with described First Heat Exchanger, described the second heat exchanger respectively, and described compressor is used to the transmission of cold energy between described the second heat exchanger and described First Heat Exchanger that power is provided.
Particularly, as preferably, described cryogenic power generation cycle device comprises: condenser, primary heater, the first expansion turbine, secondary heater and the second expansion turbine, described condenser, described primary heater, described the first expansion turbine, described secondary heater is connected in turn with described the second expansion turbine, described condenser is also connected with described the second heat exchanger, described condenser is for extracting the cold energy of described liquefied natural gas, described primary heater and described secondary heater are all for heating described liquefied natural gas, described the first expansion turbine and described the second expansion turbine are all other applicable energy for the power-conversion that described liquefied natural gas is produced.
Further, described cold energy of liquefied natural gas recycling system also comprises the 3rd heater and the 3rd expansion turbine, described condenser, described the 3rd heater and described the 3rd expansion turbine in turn head and the tail are connected, described the 3rd expansion turbine is also connected with described the second expansion turbine, and described the 3rd heater and described the 3rd expansion turbine are jointly for being converted into other applicable energy by the cold energy of the described liquefied natural gas of described condenser extraction.
As preferably, described cold energy of liquefied natural gas recycling system also comprises the 4th heater, described the 4th heater is connected with described the second expansion turbine, user, described cooler respectively, described liquefied natural gas is delivered to described user through described the second expansion turbine and described the 4th heater successively, described the 4th heater is for extracting the cold energy of described liquefied natural gas and transferring to described cooler, and this cold energy is separated for auxiliary described air liquefaction.
Particularly, as preferably, described cold energy of liquefied natural gas recycling system also comprises voltage-stablizer, and described voltage-stablizer is connected with described the second expansion turbine, and described voltage-stablizer carries out voltage stabilizing for the liquefied natural gas that described the second expansion turbine is flowed out.
As preferably, described cold energy of liquefied natural gas recycling system also comprises booster, and described booster is connected with described the second heat exchanger, and during work, described liquefied natural gas first flows into described the second heat exchanger through described booster.
As preferably, described primary heater, described secondary heater, described the 3rd heater and the 4th heater all utilize seawater to heat.
As preferably, in described the second heat exchanger and described First Heat Exchanger, all there is nitrogen, the cold energy of the described liquefied natural gas described the second heat exchanger being extracted by flowing of described nitrogen transfers to described First Heat Exchanger.
As preferably, between described condenser, the 3rd heater and described the 3rd expansion turbine, there is secondary refrigerant, the cold energy of the described liquefied natural gas described condenser being extracted by flowing of described secondary refrigerant transfers to described the 3rd expansion turbine.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
The present invention makes liquefied natural gas be undertaken after cold energy recovery by air-separating plant, liquefied natural gas partly enters cryogenic power generation cycle device and carries out cold energy recovery, remainder enters freezer retracting device and carries out cold energy recovery, thereby the cold energy of liquefied natural gas is carried out to multistage recycling, utilization rate improves greatly, reduce the waste of the energy, reduced and produced the cost utilizing, can also reach the effect of environmental protection simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the cold energy of liquefied natural gas recycling system that provides of the embodiment of the present invention.
Wherein: 1 air-separating plant,
11 air compressor machines, 12 coolers, 13 First Heat Exchangers, 14 air separation columns, 15 second heat exchangers,
16 compressors, 17 the 3rd heat exchangers,
2 cryogenic power generation cycle devices,
21 condensers, 22 primary heaters, 23 first expansion turbines, 24 secondary heaters,
25 second expansion turbines, 26 the 3rd heaters, 27 the 3rd expansion turbines,
28 flow regulators, 29 the 4th heaters,
3 boosters,
4 freezer retracting devices.
The specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
As shown in Figure 1, a kind of cold energy of liquefied natural gas recycling system that the embodiment of the present invention provides, described recycling system comprises: air-separating plant 1, freezer retracting device 4 and cryogenic power generation cycle device 2, described air-separating plant 1 respectively with described freezer retracting device 4, described cryogenic power generation cycle device 2 series connection, liquefied natural gas is by after described air-separating plant 1, described liquefied natural gas partly enters and described cryogenic power generation cycle device 2, the remainder of described liquefied natural gas enters described freezer retracting device 4, described air-separating plant 1 is for extracting the cold energy of described liquefied natural gas, and by this cold energy, the liquefaction of inside air composition is separated, described cryogenic power generation cycle device 2 is for again extracting the cold energy of described liquefied natural gas, and this cold energy is converted into other applicable energy, described freezer retracting device 4 uses for freezer for extracting the cold energy of described liquefied natural gas.
Wherein, 4 effects of freezer retracting device are the liquefied natural gas by LNG(Liquefied Natural Gas) introducing freezer, and carry out cold energy extraction, by the cold energy extracting for freezer, those skilled in the art are known, the implementation of freezer retracting device 4 has multiple, can comprise the structures such as shunt conduit, freezer and heat exchanger; Flow through the last current-sharing access customer of liquefied natural gas of cryogenic power generation cycle device 2 and freezer retracting device 4, for user, LNG is through air-separating plant 1, freezer retracting device 4 and cryogenic power generation cycle device 2, LNG itself does not produce loss, the invention is intended to the cold energy of LNG to carry out abundant extraction and application.
The present invention makes liquefied natural gas be undertaken after cold energy recovery by air-separating plant 1, liquefied natural gas partly enters cryogenic power generation cycle device 2 and carries out cold energy recovery, remainder enters freezer retracting device 4 and carries out cold energy recovery, thereby the cold energy of LNG is carried out to multistage recycling, utilization rate improves greatly, reduce the waste of the energy, reduced and produced the cost utilizing, can also reach the effect of environmental protection simultaneously.
As shown in Figure 1, particularly, as preferably, described air-separating plant 1 comprises: air compressor machine 11, cooler 12, First Heat Exchanger 13, the second heat exchanger 15, the 3rd heat exchanger 17 and air separation column 14, described air compressor machine 11, described the 3rd heat exchanger 17, described cooler 12, described First Heat Exchanger 13 is connected in turn with described air separation column 14, air is through described air compressor machine 11, described the 3rd heat exchanger 17, described cooler 12, described First Heat Exchanger 13 and described air separation column 14 liquefy separated, described First Heat Exchanger 13 is also connected with described the second heat exchanger 15 head and the tail, described the second heat exchanger 15 respectively with described freezer retracting device 4, described cryogenic power generation cycle device 2 connects, described liquefied natural gas flows into respectively described freezer retracting device 4 and described cryogenic power generation cycle device 2 through described the second heat exchanger 15, described the second heat exchanger 15 is for extracting the cold energy of described liquefied natural gas and this cold energy being transferred to described First Heat Exchanger 13.Air compressor machine 11 is for the mobile power that provides of air is provided, and the 3rd heat exchanger 17 and cooler 12 are for processing that air is lowered the temperature, and air carries out energy exchange in First Heat Exchanger 13, and it is separated at air separation column 14, to liquefy.
As preferably, described cold energy of liquefied natural gas recycling system also comprises flow regulator 28, described flow regulator 28 is arranged between described the second heat exchanger 15 and described cryogenic power generation cycle device 2, and described flow regulator 28 is for regulating described liquefied natural gas to flow into the flow proportional of described cryogenic power generation cycle device 2 and described freezer retracting device 4.
In the embodiment of the present invention, flow regulator 28 can adopt independent control valve, is used for regulating the assignment of traffic of LNG by control valve, and then regulates the cold energy of LNG to distribute; Open regulating valve flow greatly night, when LNG passes through the second heat exchanger 15, by 2 outputs of cryogenic power generation cycle device, increases, and the flow that flows into accordingly freezer retracting device 4 reduces, and adapts to higher power load and lower freezer chilling requirement; Suitably turn regulating valve flow down daytime, LNG reduces by 2 outputs of cryogenic power generation cycle device, the corresponding flow that flows into freezer retracting device 4 will increase, thereby by effective adjusting of control valve, make cryogenic power generation cycle device 2 and freezer retracting device 4 reasonable distribution utilize LNG cold energy, finally realize classification, the high efficiente callback utilization of LNG cold energy, reduce the waste of LNG cold energy.
As shown in Figure 1, further, described cold energy of liquefied natural gas recycling system also comprises compressor 16, described compressor 16 is arranged between described First Heat Exchanger 13 and described the second heat exchanger 15, described compressor 16 is connected with described First Heat Exchanger 13, described the second heat exchanger 15 respectively, and described compressor 16 is used to the transmission of cold energy between described the second heat exchanger 15 and described First Heat Exchanger 13 that power is provided.
Wherein, compressor 16, First Heat Exchanger 13 and the second heat exchanger 15 form separately a circulation, medium mobile in circulation is generally selected nitrogen, a booster 3 was generally set before the second heat exchanger 15, LNG first boosts through this booster 3, LNG release portion cryogenic cold energy during again through the second heat exchanger 15, the temperature of LNG raises simultaneously, and nitrogen in circulation is while flowing through the second heat exchanger 15, this cold energy is lowered the temperature and is made it become liquid nitrogen the nitrogen of circulation, liquid nitrogen flows into First Heat Exchanger 13 under the promotion of compressor 16, now, through air compressor machine 11 and cooler 12, outside air is pressed into First Heat Exchanger 13, in First Heat Exchanger 13, the liquid nitrogen flowing into passes to cold energy the air being pressed into, thereby make air cooling-down liquefaction, after completing, the cold energy transmission of the liquid nitrogen in circulation becomes again nitrogen, and under the promotion of compressor 16, continue to circulate to enter in the second heat exchanger 15, inside air composition is separated and enters air separation column 14, general main component is liquid oxygen and liquid nitrogen, in circulation, constantly extract the cold energy of LNG, thereby cold energy is offered to air, make its liquefaction, complete the elementary recycling to LNG cold energy.
As shown in Figure 1, particularly, as preferably, described cryogenic power generation cycle device 2 comprises: condenser 21, primary heater 22, the first expansion turbine 23, secondary heater 24 and the second expansion turbine 25, described condenser 21, described primary heater 22, described the first expansion turbine 23, described secondary heater 24 is connected in turn with described the second expansion turbine 25, described condenser 21 is also connected with described the second heat exchanger 15, described condenser 21 is for extracting the cold energy of described liquefied natural gas, described primary heater 22 and described secondary heater 24 are all for heating described liquefied natural gas, described the first expansion turbine 23 is all other applicable energy for the power-conversion that described liquefied natural gas is produced with described the second expansion turbine 25.
As shown in Figure 1, further, described cold energy of liquefied natural gas recycling system also comprises the 3rd heater 26 and the 3rd expansion turbine 27, described condenser 21, described the 3rd heater 26 and described the 3rd expansion turbine 27 in turn head and the tail are connected, described the 3rd expansion turbine 27 is also connected with described the second expansion turbine 25, and described the 3rd heater 26 and described the 3rd expansion turbine 27 are jointly for being converted into other applicable energy by the cold energy of the described liquefied natural gas of described condenser 21 extractions.
As preferably, described cold energy of liquefied natural gas recycling system also comprises the 4th heater 29, described the 4th heater 29 is connected with described the second expansion turbine 25, user, described cooler 12 respectively, described liquefied natural gas is delivered to described user through described the second expansion turbine 25 and described the 4th heater 29 successively, described the 4th heater 29 is for extracting the cold energy of described liquefied natural gas and transferring to described cooler 12, and this cold energy is separated for auxiliary described air liquefaction.
Wherein, LNG flow to the 4th heater 29 through the second expansion turbine 25, then flow to user place, the 4th heater 29 is also connected with cooler 12, object is the cold energy of the LNG of the 4th heater 29 extractions to be passed to cooler 12 places, separated in order to auxiliary air liquefaction, thus realize the multistage utilization of cold energy of LNG, cut the waste.
Particularly, as preferably, described cold energy of liquefied natural gas recycling system also comprises voltage-stablizer, and described voltage-stablizer is connected with described the second expansion turbine 25, and described voltage-stablizer carries out voltage stabilizing for the liquefied natural gas that described the second expansion turbine 25 is flowed out.
As shown in Figure 1, as preferably, described cold energy of liquefied natural gas recycling system also comprises booster 3, and described booster 3 is connected with described the second heat exchanger 15, and during work, described liquefied natural gas first flows into described the second heat exchanger 15 through described booster 3.
As preferably, described primary heater 22, described secondary heater 24, described the 3rd heater 26 and the 4th heater 29 all utilize seawater to heat.
As preferably, described the second heat exchanger 15 and described First Heat Exchanger 13 be interior all has nitrogen, and the cold energy of the described liquefied natural gas described the second heat exchanger 15 being extracted by flowing of described nitrogen transfers to described First Heat Exchanger 13.
As preferably, between described condenser 21, the 3rd heater 26 and described the 3rd expansion turbine 27, have secondary refrigerant, the cold energy of the described liquefied natural gas described condenser 21 being extracted by flowing of described secondary refrigerant transfers to described the 3rd expansion turbine 27.
Wherein, on the one hand, condenser 21, the 3rd heater 26 is connected with the 3rd expansion turbine 27, form separately the circulation that another one circulatory mediator is secondary refrigerant, with circulation in air-separating plant 1 as a same reason, when LNG flows out into cryogenic power generation cycle device 2 from the second heat exchanger 15, be introduced in condenser 21, first condenser 21 can extract again to the cold energy of LNG, the circulation of this cold energy meeting supplying secondary refrigerant, offer secondary refrigerant power cycle low-temperature receiver, the cold energy extracting by condenser 21 carrys out cooling secondary refrigerant, the temperature of LNG further raises simultaneously, generally between condenser 21 and the 3rd heater 26, a booster 3 is set, after cooled secondary refrigerant boosts by booster 3, through the 3rd heater 26, absorb heat to normal temperature again, then secondary refrigerant promotes the 3rd expansion turbine 27 and makes its external outputting power, do work, make cold energy be converted into other energy, after secondary refrigerant acting, heat up and again enter the cold energy that condenser 21 continues to extract LNG, circulate successively, on the other hand, LNG is after condenser 21 flows out, enter successively primary heater 22, the first expansion turbine 23, secondary heater 24 and the second expansion turbine 25, first LNG discharges cold energy through primary heater 22 heating, now LNG gasification is gaseous natural gas, after rising to normal temperature, promote the external outputting power of the first expansion turbine 23, the outlet of the first expansion turbine 23 is connected to secondary heater 24, gaseous natural gas again discharges cold energy after heat rises to normal temperature again, thereby promote the external outputting power of the second expansion turbine 25, the outlet pressure of the second expansion turbine 25 is reduced to supplies with the needed pressure of user, gaseous natural gas flows out the second expansion turbine 25 and through the 4th heater 29, again extracts cold energy again, finally by crossing the rear user of supply of heating up, finally realize the multistage recycling of LNG cold energy, reduce the waste of LNG cold energy.
Certainly, those skilled in the art are known, also can according to actual needs, a plurality of air-separating plants 1 be set and be connected with cryogenic power generation cycle device 2, thereby LNG cold energy is fully recycled.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a cold energy of liquefied natural gas recycling system, it is characterized in that, described cold energy of liquefied natural gas recycling system comprises: air-separating plant, freezer retracting device and cryogenic power generation cycle device, described air-separating plant respectively with described freezer retracting device, described cryogenic power generation cycle device series connection, liquefied natural gas is by after described air-separating plant, described liquefied natural gas partly enters described cryogenic power generation cycle device, the remainder of described liquefied natural gas enters described freezer retracting device, described air-separating plant is for extracting the cold energy of described liquefied natural gas, and utilize this cold energy that the liquefaction of inside air composition is separated, described cryogenic power generation cycle device is for extracting the cold energy of described liquefied natural gas, and this cold energy is converted into other applicable energy, described freezer retracting device uses for freezer for extracting the cold energy of described liquefied natural gas.
2. cold energy of liquefied natural gas recycling system according to claim 1, it is characterized in that, described air-separating plant comprises: air compressor machine, cooler, First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger and air separation column, described air compressor machine, described the 3rd heat exchanger, described cooler, described First Heat Exchanger is connected in turn with described air separation column, air is through described air compressor machine, described the 3rd heat exchanger, described cooler, described First Heat Exchanger and described air separation column liquefy separated, described First Heat Exchanger is also connected with described the second heat exchanger separately from beginning to end, described the second heat exchanger respectively with described freezer retracting device, described cryogenic power generation cycle device connects, described liquefied natural gas flows into respectively described freezer retracting device and described cryogenic power generation cycle device through described the second heat exchanger, described the second heat exchanger is for extracting the cold energy of described liquefied natural gas and this cold energy being transferred to described First Heat Exchanger.
3. cold energy of liquefied natural gas recycling system according to claim 2, it is characterized in that, described cold energy of liquefied natural gas recycling system also comprises flow regulator, described flow regulator is arranged between described the second heat exchanger and described cryogenic power generation cycle device, and described flow regulator is for regulating described liquefied natural gas to flow into the flow proportional of described cryogenic power generation cycle device and described freezer retracting device.
4. cold energy of liquefied natural gas recycling system according to claim 3, it is characterized in that, described cryogenic power generation cycle device comprises: condenser, primary heater, the first expansion turbine, secondary heater and the second expansion turbine, described condenser, described primary heater, described the first expansion turbine, described secondary heater is connected in turn with described the second expansion turbine, described condenser is also connected with described the second heat exchanger, described condenser is for extracting the cold energy of described liquefied natural gas, described primary heater and described secondary heater are all for heating described liquefied natural gas, described the first expansion turbine and described the second expansion turbine are all other applicable energy for the power-conversion that described liquefied natural gas is produced.
5. cold energy of liquefied natural gas recycling system according to claim 2, it is characterized in that, described cold energy of liquefied natural gas recycling system also comprises the 3rd heater and the 3rd expansion turbine, described condenser, described the 3rd heater and described the 3rd expansion turbine in turn head and the tail are connected, described the 3rd expansion turbine is also connected with described the second expansion turbine, and described the 3rd heater and described the 3rd expansion turbine are jointly for being converted into other applicable energy by the cold energy of the described liquefied natural gas of described condenser extraction.
6. cold energy of liquefied natural gas recycling system according to claim 5, it is characterized in that, described cold energy of liquefied natural gas recycling system also comprises the 4th heater, described the 4th heater is connected with described the second expansion turbine, user, described cooler respectively, described liquefied natural gas is delivered to described user through described the second expansion turbine and described the 4th heater successively, described the 4th heater is for extracting the cold energy of described liquefied natural gas and transferring to described cooler, and this cold energy is separated for auxiliary described air liquefaction.
7. cold energy of liquefied natural gas recycling system according to claim 6, it is characterized in that, described cold energy of liquefied natural gas recycling system also comprises booster, described booster is connected with described the second heat exchanger, during work, described liquefied natural gas first flows into described the second heat exchanger through described booster.
8. cold energy of liquefied natural gas recycling system according to claim 7, is characterized in that, described primary heater, described secondary heater, described the 3rd heater and the 4th heater all utilize seawater to heat.
9. cold energy of liquefied natural gas recycling system according to claim 8, it is characterized in that, in described the second heat exchanger and described First Heat Exchanger, all there is nitrogen, along with flowing of described nitrogen transfers to described First Heat Exchanger by the cold energy of the described liquefied natural gas of described the second heat exchanger extraction.
10. cold energy of liquefied natural gas recycling system according to claim 9, it is characterized in that, between described condenser, the 3rd heater and described the 3rd expansion turbine, have secondary refrigerant, the cold energy of the described liquefied natural gas described condenser being extracted by flowing of described secondary refrigerant transfers to described the 3rd expansion turbine.
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