CN105401989A - System and method for comprehensively utilizing liquefied natural gas (LNG) energy - Google Patents
System and method for comprehensively utilizing liquefied natural gas (LNG) energy Download PDFInfo
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- CN105401989A CN105401989A CN201510910766.8A CN201510910766A CN105401989A CN 105401989 A CN105401989 A CN 105401989A CN 201510910766 A CN201510910766 A CN 201510910766A CN 105401989 A CN105401989 A CN 105401989A
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000003860 storage Methods 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 239000000446 fuel Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 133
- 239000003507 refrigerant Substances 0.000 claims description 52
- 238000005057 refrigeration Methods 0.000 claims description 49
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 44
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 38
- 239000003546 flue gas Substances 0.000 claims description 38
- 238000001816 cooling Methods 0.000 claims description 23
- 239000003345 natural gas Substances 0.000 claims description 22
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 238000010304 firing Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000002309 gasification Methods 0.000 claims description 16
- 239000011435 rock Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 11
- 239000003517 fume Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 8
- 238000009834 vaporization Methods 0.000 claims description 7
- 230000008016 vaporization Effects 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 abstract 2
- 239000000779 smoke Substances 0.000 abstract 2
- 239000000567 combustion gas Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 20
- 230000008859 change Effects 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
- F22B1/1815—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/60—Application making use of surplus or waste energy
- F05D2220/62—Application making use of surplus or waste energy with energy recovery turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/60—Application making use of surplus or waste energy
- F05D2220/64—Application making use of surplus or waste energy for domestic central heating or production of electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/70—Application in combination with
- F05D2220/76—Application in combination with an electrical generator
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a system and method for comprehensively utilizing the liquefied natural gas (LNG) energy. No system and method for comprehensively utilizing the LNG energy exists at present. The system comprises an LNG storage tank, a first valve, an LNG pump, a first flowmeter, a first-stage heat exchanger, a second-stage heat exchanger, an air heater, a second thermo detector and a combustion chamber which are sequentially connected to a fuel conveying pipe. A heat recovery boiler, an inducing fan, a tenth valve and the second-stage heat exchanger are sequentially connected to a smoke exhaust pipe. The heat recovery boiler, a steam turbine, a condenser and a water feeding pump are sequentially connected to a steam circular pipe. The method comprises the steps that smoke passes through a combustion gas turbine, the heat recovery boiler, the inducing fan, the tenth valve and the second-stage heat exchanger and exhausted to the atmosphere, and steam discharged by the heat recovery boiler sequentially passes through the steam turbine, the condenser and the water feeding pump and then enters the heat recovery boiler again to form a steam cycle. According to the system and method, the LNG cold energy and thermal energy are fully utilized.
Description
Technical field
The present invention relates to a kind of system and method fully utilizing LNG energy, the rock gas after main utilization gasification carries out generating electricity and heat supply, belongs to the comprehensive utilization technique of LNG cold energy and heat energy.
Background technique
LNG Liquefied natural gas (LNG) is the super-low liquid of-162 DEG C at ambient pressure, producing 1 ton of LNG needs electric energy to be about 850kWh, the LNG of 1 ton is from-162 DEG C of gasifications to 0 DEG C, the cold of 230 ~ 240kWh can be discharged, if so large cold is recycled, there are very considerable economic and social benefits.
Publication date is on 09 01st, 2010, the patent No. is in the Chinese patent of 200920238201.X, disclose a kind of freezer running gear utilizing cold energy of liquefied natural gas to freeze, this freezer running gear uses liquefied ammonia as refrigerant, reclaim LNG cold energy by liquefied ammonia and LNG direct heat transfer and be used for freezer refrigerating, the cold energy of LNG can be used-25 ~-30 DEG C from-162 DEG C, effectively be extracted the cold energy of LNG for freezer cooling, freezer additionally uses the cold-working of voltage contraction is simultaneously low-temperature receiver for subsequent use.But this patent only considers LNG cold energy use system, do not consider the comprehensive utilization of the rear rock gas heat energy of LNG gasification.
Publication date is on October 02nd, 2013, application number is in the Chinese patent of 201310295858.0, disclose a kind of LNG energy comprehensive utilization system, first by cold energy recovery plant, the recovery of LNG cold energy is stored in ice cold-storage device in this utilization system, then cold energy is passed to air conditioner cold water by ice cold-storage device, to resident's cooling.LNG cold energy enters the generating of Distribution of Natural formula energy source station and produces hot water, cold water after reclaiming.But LNG cold energy is produced air conditioner cold water by this LNG energy comprehensive utilization system, belongs to by high-grade cold energy for the production of low-grade cold water, there is no the method coordinated mutually between LNG cold energy and heat energy yet, therefore need to consider more efficient cold and hot Application way.
Combustion engine is exerted oneself very responsive to atmospheric temperature, and atmospheric temperature rising can cause compressor pressure ratio to decline, and gas compressor specific consumption merit increases, and MAF reduces, and unit Effective power declines.General atmosphere temperature raises 1K, combustion engine output power reduces about 1%, and air temperature often reduces by 10 DEG C, Gas Turbine Output on average increases by 10%, system effectiveness also can improve about 2%, therefore combustion engine inlet gas cooling effectively can improve the capacity of combustion engine, especially for the combustion engine operated under summer condition.
Summary of the invention
The object of the invention is the problem in order to solve LNG cold energy and heat integration difficulty, and a kind of system and method fully utilizing LNG energy is provided.This system is by recycling LNG cold energy with cold unit, then the rock gas after gasification enters gas power device combustion power generation and UTILIZATION OF VESIDUAL HEAT IN, the LNG cold energy and the heat energy that supply this system are fully utilized, unnecessary rock gas is not had to return main gas pipe network, system exports unnecessary electric power and hot water or cold water, and low-temperature flue gas enters air.
The present invention's adopted technological scheme that solves the problem is: the system of this comprehensive utilization LNG energy comprises a valve, a flowmeter, LNG storage tank, LNG pump and fuel-supply pipe, its structural feature is: also comprise No. two valves, No. four valves, No. seven valves, No. eight valves, No. ten valves, ride on Bus No. 11 valve, No. two flowmeters, No. three flowmeters, a thermoscope, No. two thermoscopes, feed water pump, refrigerant pump, induced draught fan, blower, first-class heat exchanger, secondary heat exchanger, vapour condenser, exhaust heat boiler, freezer, coolant storage tank, steam turbine, gas turbine, air compressor, firing chamber, alternator, air heater, flue gas supplying tube, flue gas exit pipe, smoke-ejecting pipe, air delivery pipe, steam circulating pipe and refrigerant circulation pipe, described LNG storage tank, a valve, LNG pump, a flowmeter, first-class heat exchanger, secondary heat exchanger, air heater, No. two thermoscopes and firing chamber are connected in turn on fuel-supply pipe, described blower, No. four valves, secondary heat exchanger, No. two flowmeters and air compressor are connected in turn on air delivery pipe, described air compressor is connected with firing chamber by pipeline, this firing chamber is connected with gas turbine by pipeline, and described gas turbine is connected with exhaust heat boiler by flue gas supplying tube, described exhaust heat boiler, induced draught fan, No. ten valves and secondary heat exchanger are connected in turn on flue gas exit pipe, and one end of described smoke-ejecting pipe is connected on the flue gas exit pipe between induced draught fan and No. ten valves, described ride on Bus No. 11 valve installation on smoke-ejecting pipe, described exhaust heat boiler, steam turbine, vapour condenser and feed water pump are connected in turn on steam circulating pipe, described steam turbine, alternator, gas turbine is connected successively with air compressor, described No. two valves, first-class heat exchanger, No. seven valves, coolant storage tank, refrigerant pump, No. eight valves, No. three flowmeters and freezer are connected in turn on refrigerant circulation pipe, and a described thermoscope is arranged on freezer.
As preferably, the present invention also comprises No. nine valves, ice making station and ice making station connecting tube, one end of described ice making station connecting tube is connected on the refrigerant circulation pipe between refrigerant pump and No. eight valves, the other end of this ice making station connecting tube is connected on the refrigerant circulation pipe between freezer and No. two valves, and described No. nine valves and ice making station are all connected on the connecting tube of ice making station.
As preferably, the present invention also comprises No. three valves, electric compression refrigerating apparatus and No. two bypasses, one end of described No. two bypasses is connected on the refrigerant circulation pipe between first-class heat exchanger and No. seven valves, the other end of these No. two bypasses is connected on the refrigerant circulation pipe between freezer and No. two valves, and described No. three valves and electric compression refrigerating apparatus are all connected in No. two bypasses.
As preferably, the present invention also comprises No. five valves and a bypass, one end of a described bypass is connected on the air delivery pipe between blower and No. four valves, the other end of this bypass is connected on the air delivery pipe between secondary heat exchanger and No. two flowmeters, and described No. five valve installations are in a bypass.
As preferably, the present invention also comprises No. six valves and cool water heating pipe, and described cool water heating pipe is connected with exhaust heat boiler, and described No. six valve installations are on cool water heating pipe.
A kind of method using described system to carry out fully utilizing LNG energy, its feature is: the step of described method is: the LNG transferred out by fuel-supply pipe carries out heat exchange with the refrigerant in refrigerant circulation pipe, the air inlet in gas turbine respectively by first-class heat exchanger, secondary heat exchanger, afterwards through air heater and No. two thermoscopes, constitute LNG cold energy recovery unit, the air preparing to enter gas turbine by pipeline successively through blower, No. four valves, secondary heat exchanger, No. two flowmeters enter air compressor, and burn after mixing with rock gas in firing chamber, flue gas after burning is successively through gas turbine, exhaust heat boiler, induced draught fan, No. ten valves and secondary heat exchanger enter air and/or successively through gas turbine, exhaust heat boiler, induced draught fan, ride on Bus No. 11 valve enters air, exhaust heat boiler steam is out successively through steam turbine simultaneously, vapour condenser and feed water pump, again enter exhaust heat boiler afterwards and form vapor recycle, cold water is heated to be hot water after No. six valves and exhaust heat boiler, more than form the fuel engine power generation unit with inlet gas cooling and UTILIZATION OF VESIDUAL HEAT IN, refrigerant after refrigeration first reclaims LNG cold energy and/or through No. three valves, electric compression refrigerating apparatus through No. two valves, first-class heat exchanger successively along pipeline, again successively through No. seven valves, coolant storage tank, refrigerant pumps, then enter freezer through No. eight valves, No. three flowmeters and/or enter ice making station refrigeration through No. nine valves, enter next circulation after refrigeration, above formation has the freezer unit of ice making adjustment and standby electricity refrigeration.
As preferably, the present invention first by the main LNG delivery volume determining this system by the refrigeration duty of cold unit, then according to the electric motor power of the amount of natural gas determination gas power device after gasification; Otherwise, also can determine required amount of natural gas according to the electric motor power of gas power device, thus determine the LNG delivery volume of this system, then be determined mainly by the refrigeration duty of cold unit by LNG delivery volume.
As preferably, cold energy recycle process flexible ground of the present invention is coordinated mutually, to meet different use energy objects, LNG gasification cold energy recycle process is divided into two-part: A. reclaims cryogenic cold energy supply refrigeration duty by first-class heat exchanger, and B. reclaims remaining cryogenic cold energy in order to cool the air entering gas turbine by secondary heat exchanger; When fluctuation occurs the refrigeration duty of freezer, by the adjustment at ice making station, the LNG amount of vaporization of first-class heat exchanger is made to keep stable; When needs increase combustion engine is exerted oneself, by reducing the cold medium flux of first-class heat exchanger, reducing its refrigeration duty, reducing the natural gas temperature entered in secondary heat exchanger, thus reduce the chilling temperature of gas turbine inlet air, improve exerting oneself of gas turbine.
As preferably, system of the present invention has taken into full account measure for subsequent use, mainly with cold cell failure or ambient temperature lower time, adopt air heater or fume afterheat heating to ensure that LNG gasifies; When first-class heat exchanger break down stop using or gas turbine be operated in be less than declared working condition time, freezer needs to enable electric compression refrigerating apparatus for subsequent use.
As preferably, heat energy utilization process of the present invention mainly comprises: generating of doing work in the gas turbine after combustion of natural gas, exhaust heat boiler is produced steam and to be done work in steam turbine generating, hot water produced by exhaust heat boiler, fume afterheat heated natural gas in secondary heat exchanger under the lower operating mode of ambient temperature, flue gas loss is less, and the thermal efficiency of system is high.
As preferably, the air that blower of the present invention is sent have employed through No. four valves, secondary heat exchanger No. five valves playing bypass effect, when ambient temperature is lower, gas turbine inlet air does not need low temperature refrigeration more than the LNG, directly enters air compressor by No. five valves, No. two flowmeters; Induced draught fan flue gas out, drain into air by ride on Bus No. 11 valve, have employed No. ten valves playing bypass effect, when ambient temperature is lower, NG can not be heated to the temperature of gas turbine requirement by air heater, needs that flue gas is sent in secondary heat exchanger through No. ten valves and heats NG.
The present invention compared with prior art, has the following advantages and effect: this system forms primarily of LNG cold energy recovery unit, the main cold unit utilizing LNG cold energy, the distributed busbar protection with gas power device and low-grade cooling and heating load unit.Whole system first recycles LNG cold energy, then the combustion of natural gas generating after gasification and UTILIZATION OF VESIDUAL HEAT IN, mainly consume the amount of natural gas moment with LNG amount of vaporization needed for cold unit and gas power device to mate, the LNG cold energy and the heat energy that supply this system are fully utilized, unnecessary rock gas is not had to return main gas pipe network, system exports unnecessary electric power and hot water or cold water, and low-temperature flue gas enters air.
The main cryogenic cold energy utilizing LNG with cold unit, natural gas temperature after utilization is at about-40 DEG C, remaining more than this part cryogenic cold energy be difficult to be utilized by the main cold unit of low temperature, but can be recycled by the distributed busbar protection with gas power device, be used for improving exerting oneself or producing air conditioner cold water of gas power device.LNG cold energy recycle unit is mainly divided into two-part: 1. by LNG and the heat exchange of low temperature refrigerant, reclaim the cryogenic cold energy supply of LNG mainly with cold unit (low temperature cold load), after utilizing, LNG gasification is into about the rock gas of-40 DEG C, remaining more than this part cryogenic cold energy be difficult to be utilized by low temperature cold load; 2. reclaim cryogenic cold energy more than LNG by the air inlet heat exchange of NG and gas power device and, in order to cool the air (remaining low temperature cold load) entering gas power device, improve generated output.The utilization of LNG heat energy realizes mainly through the gas power device generating in distributed busbar protection and UTILIZATION OF VESIDUAL HEAT IN.
Cold energy use is combined with gas power device generated output, by regulating the main intake temperature carrying out regulating gas power plant with the low temperature cold load of cold unit, thus realize between low temperature cold load and remaining low temperature cold load, mutually mating by LNG cold energy the object reaching regulating gas power plant and exert oneself.
Mainly reclaimed the cryogenic cold energy of LNG by the heat exchange of low temperature refrigerant with cold unit, but mainly stablize with the cooling of cold unit for ensureing, need a set of electric compression refrigerating apparatus for subsequent use, normally gasify at LNG, without interruption, mainly all supplied by LNG with the cold energy needed for cold unit, only can not open electric compression refrigerating apparatus for subsequent use during regular supply at LNG.
Carry out stable refrigeration duty by the main self-regulation system with cold unit, also carry out stable LNG amount of vaporization by the coupling in LNG cold energy recovery unit between low temperature cold load and remaining low temperature cold load.Because gas power device power generation requirements gas supply is steady, and mainly may fluctuate because of the change of refrigeration duty by the LNG cryogenic cold energy needed for cold unit, refrigeration duty as freezer can fluctuate along with the change of warehouse goods amount, and the preparation amount of dry ice can regulate preparation amount because of the market demand.Therefore in order to ensure LNG gasification continuously, mainly needing to build supporting refrigeration duty regulating system with cold unit and carrying out equilibrium fluctuations, as freezer can carry out stable refrigeration duty by coordinating ice making.
On the basis of the hot and cold total energy approach of LNG, system has taken into full account various measure for subsequent use, ensures security of system under different operating mode, stable operation.Mainly with cold cell failure or when stopping transport, the fume afterheat of air heater or gas power device is adopted to ensure that LNG gasifies; When LNG cold energy recovery unit fault or gas power device are stopped transport, the supply of standby electricity refrigeration is adopted mainly to use cold unit.
By regulating the main intake temperature carrying out regulating gas power plant with the low temperature cold load of cold unit, thus realize between low temperature cold load and remaining low temperature cold load, mutually mating by LNG cold energy the object reaching regulating gas power plant and exert oneself.Because LNG cold energy recovery unit is divided into the main cold unit of cryogenic cold energy supply and remaining cryogenic cold energy to gas power device inlet gas cooling two-part, can by regulate mainly with in cold unit with the cold medium flux of LNG heat exchange, LNG is regulated to supply the cold energy size of low temperature cold load, thus regulate the outlet temperature of the rock gas after low temperature cold load cooling, also namely supply the natural gas temperature of remaining low temperature load, thus realize regulating the intake temperature of gas power device.This method not only can regulating gas power plant intake temperature, is also to solve because the main LNG that to cause with cold unit refrigeration duty fluctuation gasifies a kind of method of fluctuation problem.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the system fully utilizing LNG energy in the embodiment of the present invention.
Fig. 2 is the structural representation of the system fully utilizing LNG energy in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment.
See Fig. 1 to Fig. 2, the system fully utilizing LNG energy in the present embodiment comprises a valve 1, No. two valves 2, No. three valves 3, No. four valves 4, No. five valves 5, No. six valves 6, No. seven valves 7, No. eight valves 8, No. nine valves 9, No. ten valves 10, ride on Bus No. 11 valve 11, a flowmeter 12, No. two flowmeters 13, No. three flowmeters 14, a thermoscope 15, No. two thermoscopes 16, feed water pump 17, refrigerant pump 18, induced draught fan 19, blower 20, LNG storage tank 21, first-class heat exchanger 22, secondary heat exchanger 23, vapour condenser 24, exhaust heat boiler 25, LNG pump 26, electricity compression refrigerating apparatus 27, freezer 28, ice making station 29, coolant storage tank 30, steam turbine 31, gas turbine 32, air compressor 33, firing chamber 34, alternator 35, air heater 36, fuel-supply pipe 37, flue gas supplying tube 38, flue gas exit pipe 39, smoke-ejecting pipe 40, air delivery pipe 41, a bypass 42, steam circulating pipe 43, cool water heating pipe 44, refrigerant circulation pipe 45, ice making station connecting tube 46 and No. two bypasses 47.
LNG storage tank 21, a valve 1, LNG pump 26, a flowmeter 12, first-class heat exchanger 22, secondary heat exchanger 23, air heater 36, No. two thermoscopes 16 and firing chamber 34 are connected in turn on fuel-supply pipe 37, blower 20, No. four valves 4, secondary heat exchanger 23, No. two flowmeters 13 and air compressor 33 are connected in turn on air delivery pipe 41, air compressor 33 is connected with firing chamber 34 by pipeline, this firing chamber 34 is connected with gas turbine 32 by pipeline, and gas turbine 32 is connected with exhaust heat boiler 25 by flue gas supplying tube 38, exhaust heat boiler 25, induced draught fan 19, No. ten valves 10 and secondary heat exchanger 23 are connected in turn on flue gas exit pipe 39, and one end of smoke-ejecting pipe 40 is connected on the flue gas exit pipe 39 between induced draught fan 19 and No. ten valves 10, and ride on Bus No. 11 valve 11 is arranged on smoke-ejecting pipe 40, exhaust heat boiler 25, steam turbine 31, vapour condenser 24 and feed water pump 17 are connected in turn on steam circulating pipe 43, steam turbine 31, alternator 35, gas turbine 32 is connected successively with air compressor 33, No. two valves 2, first-class heat exchanger 22, No. seven valves 7, coolant storage tank 30, refrigerant pump 18, No. eight valves 8, No. three flowmeters 14 and freezer 28 are connected in turn on refrigerant circulation pipe 45, and a thermoscope 15 is arranged on freezer 28.
One end of ice making station connecting tube 46 is connected on the refrigerant circulation pipe 45 between refrigerant pump 18 and No. eight valves 8, the other end of this ice making station connecting tube 46 is connected on the refrigerant circulation pipe 45 between freezer 28 and No. two valves 2, and No. nine valves 9 and ice making station 29 are all connected on ice making station connecting tube 46.One end of No. two bypasses 47 is connected on the refrigerant circulation pipe 45 between first-class heat exchanger 22 and No. seven valves 7, the other end of these No. two bypasses 47 is connected on the refrigerant circulation pipe 45 between freezer 28 and No. two valves 2, and No. three valves 3 and electric compression refrigerating apparatus 27 are all connected in No. two bypasses 47.
One end of a bypass 42 is connected on the air delivery pipe 41 between blower 20 and No. four valves 4, the other end of this bypass 42 is connected on the air delivery pipe 41 between secondary heat exchanger 23 and No. two flowmeters 13, and No. five valves 5 are arranged in a bypass 42.Cool water heating pipe 44 is connected with exhaust heat boiler 25, and No. six valves 6 are arranged on cool water heating pipe 44.
The step using the system of comprehensive utilization LNG energy to carry out the method fully utilizing LNG energy in the present embodiment is: the LNG transferred out by fuel-supply pipe 37 carries out heat exchange with the air inlet in the refrigerant in refrigerant circulation pipe 45, gas turbine 32 respectively by first-class heat exchanger 22, secondary heat exchanger 23, afterwards through air heater 36 and No. two thermoscopes 16, constitute LNG cold energy recovery unit, the air preparing to enter gas turbine 32 by pipeline successively through blower 20, No. four valves 4, secondary heat exchanger 23, No. two flowmeters 13 enter air compressor 33, and burn after mixing with rock gas in firing chamber 34, flue gas after burning is successively through gas turbine 32, exhaust heat boiler 25, induced draught fan 19, No. ten valves 10 and secondary heat exchanger 23 enter air and/or successively through gas turbine 32, exhaust heat boiler 25, induced draught fan 19, ride on Bus No. 11 valve 11 enters air, exhaust heat boiler 25 steam is out successively through steam turbine 31 simultaneously, vapour condenser 24 and feed water pump 17, again enter exhaust heat boiler 25 afterwards and form vapor recycle, cold water is heated to be hot water after No. six valves 6 and exhaust heat boiler 25, more than form the fuel engine power generation unit with inlet gas cooling and UTILIZATION OF VESIDUAL HEAT IN, refrigerant after refrigeration first reclaims LNG cold energy and/or through No. three valves 3, electric compression refrigerating apparatus 27 through No. two valves 2, first-class heat exchanger 22 successively along pipeline, again successively through No. seven valves 7, coolant storage tank 30, refrigerant pump 18, then enter freezer 28 through No. eight valves 8, No. three flowmeters 14 and/or enter ice making station 29 through No. nine valves 9 and freeze, enter next circulation after refrigeration, above formation has the freezer unit of ice making adjustment and standby electricity refrigeration.
Cold energy recycle process flexible ground is coordinated mutually, to meet different use energy objects, LNG gasification cold energy recycle process is divided into two-part: A. reclaims cryogenic cold energy supply refrigeration duty by first-class heat exchanger 22, and B. reclaims remaining cryogenic cold energy in order to cool the air entering gas turbine 32 by secondary heat exchanger 23; When fluctuation occurs the refrigeration duty of freezer 28, by the adjustment at ice making station 29, the LNG amount of vaporization of first-class heat exchanger 22 is made to keep stable; When needs increase combustion engine is exerted oneself, by reducing the cold medium flux of first-class heat exchanger 22, reducing its refrigeration duty, reducing the natural gas temperature entered in secondary heat exchanger 23, thus reduce the chilling temperature of gas turbine 32 air inlet, improve exerting oneself of gas turbine 32.Certainly, when there is fluctuation in the refrigeration duty of freezer 28, if when wave range is less, also can not be regulated by ice making, result can cause the intake temperature of gas turbine 32 to change, the fluctuation in more among a small circle of exerting oneself of gas turbine 32, the mode of concrete reply freezer 28 fluctuation of load needs to select according to actual conditions.
Mainly with cold cell failure or ambient temperature lower time, adopt air heater 36 or fume afterheat heating to ensure that LNG gasifies; When first-class heat exchanger 22 break down stop using or gas turbine 32 be operated in be less than declared working condition time, freezer 28 needs to enable electric compression refrigerating apparatus 27 for subsequent use.
Heat energy utilization process mainly comprises: acting generating in gas turbine 32 after combustion of natural gas, exhaust heat boiler 25 is produced steam and to be done work in steam turbine 31 generating, hot water produced by exhaust heat boiler 25, fume afterheat heated natural gas in secondary heat exchanger 23 under the lower operating mode of ambient temperature, flue gas loss is less, and the thermal efficiency of system is high.
The air that blower 20 is sent have employed through No. four valves 4, secondary heat exchanger 23 No. five valves 5 playing bypass effect, when ambient temperature is lower, gas turbine 32 air inlet does not need low temperature refrigeration more than the LNG, directly enters air compressor 33 by No. five valves 5, No. two flowmeters 13; Induced draught fan 19 flue gas out, air is drained into by ride on Bus No. 11 valve 11, have employed No. ten valves 10 playing bypass effect, when ambient temperature is lower, NG can not be heated to the temperature that gas turbine 32 requires by air heater 36, needs that flue gas is sent in secondary heat exchanger 23 through No. ten valves 10 and heats NG.
The LNG amount of vaporization consumed according to gas turbine 32 in the present embodiment designs the refrigeration duty scale of freezer 28.The cold energy of LNG and comprehensive utilization system for heat energy mainly comprise (a) LNG accumulating unit; The heat exchanger unit of (b) LNG cold energy callback course; C () has the freezer unit of ice making adjustment and standby electricity refrigeration; D () has the gas turbine power generating unit of inlet gas cooling and UTILIZATION OF VESIDUAL HEAT IN.
LNG accumulating unit mainly comprises: carry the LNG come to enter LNG storage tank 21 by tank car or LNG conveyance conduit, regulated the gasification flow of LNG by a flowmeter 12 and LNG pump 26, the gasification flow of LNG depends primarily on the size of gas turbine 32 load.
LNG cold energy callback course heat exchanger unit comprises: the first-class heat exchanger 22, NG of LNG and refrigerant R717 heat exchange and the secondary heat exchanger 23 of gas turbine 32 air inlet heat exchange, air heater 36 for subsequent use, and No. two thermoscopes 16.The refrigeration duty of first-class heat exchanger 22 and secondary heat exchanger 23 can be regulated by the flow controlling to enter refrigerant R717 in first-class heat exchanger 22, thus realizes refrigeration duty between two-stage heat exchanger and mutually mate.
First the effect of air heater 36 is for subsequent use as LNG heating and gasifying, when freezer 28 is stopped transport or first-class heat exchanger 22 breaks down, is directly used for heating the natural gas temperature that LNG requires to gas turbine 32; Secondly, between freezer 28LNG cooling and gas turbine 32 inlet gas cooling in the mutual adjustment process of cold energy, because the excursion of the excess air coefficient of gas turbine 32 is less, when entering the natural gas temperature step-down of secondary heat exchanger 23, its export gas temperature also can reduce, and therefore needs air heater 36 to heat further.The natural gas temperature after gasification monitored by No. two thermoscopes 16, thus regulates the flue gas flow in the air mass flow of air heater 36 or secondary heat exchanger 23, makes natural gas temperature meet the requirement of gas turbine 32.
There is the freezer unit of ice making adjustment and standby electricity refrigeration: freezer unit is the basic refrigeration duty in the present embodiment, the present embodiment is by the scale of the electric motor power design freezer 28 of gas turbine 32, simultaneously supporting ice making station 29 is used for regulating the refrigeration duty of freezer 28, electricity compression refrigerating apparatus 27, as the unit for subsequent use of freezer 28, is enabled when first-class heat exchanger 22 quits work.The present embodiment adopts refrigerant R717, under design conditions, electricity compression refrigerating apparatus 27 is stopped using, No. three valves 3 and No. nine valves 9 are closed, No. two valves 2, No. seven valves 7 and No. eight valves 8 are opened, refrigerant R717 in first-class heat exchanger 22 with LNG heat exchange after, enter coolant storage tank 30, then after refrigerant pump 18 boosts, freezer 28 is sent into, the temperature of freezer 28 monitored by a thermoscope 15, the flow of refrigerant monitored by No. three flowmeters 14, regulates the unlatching size of No. eight valves 8 according to the change of storehouse temperature, thus controls the cold medium flux entering freezer 28; During when the refrigeration duty generation fluctuation of freezer 28 or lower than Design cooling load, No. nine valves 9 are opened, enter freezer 28 from a refrigerant pump 18 refrigerant part out and meet its refrigeration duty demand, another part refrigerant enters supporting ice making station 29, to be dissolved this part cold energy by ice making.Refrigerant R717 after release cold energy turns back to condensation in first-class heat exchanger 22, starts next circulation.
There is the gas turbine power generating unit of inlet gas cooling and UTILIZATION OF VESIDUAL HEAT IN: under the higher operating mode of ambient temperature, rock gas (NG) side of gas turbine 32, secondary heat exchanger 23 is entered from first-class heat exchanger 22 NG out, by the air inlet of remaining cryogenic cold energy release cooling gas turbine 32, then NG enters in air heater 36 temperature be heated to further needed for gas turbine 32, and the firing chamber 34 entering gas turbine 32 afterwards participates in burning.The air side of gas turbine 32, No. five valves 5 and No. six valves 6 are closed, No. four valves 4 are opened, air is sent to secondary heat exchanger 23 through blower 20 and is cooled, air mass flow measured by No. two flowmeters 13 simultaneously, thus passes through the excess air coefficient of blower 20 regulating gas turbine 32, and air is after secondary heat exchanger 23 cools, enter in air compressor 33 and compress, then enter in firing chamber 34 and participate in burning.Gas turbine 32 fume side, No. ten valves 10 are closed, ride on Bus No. 11 valve 11 is opened, the flue gas out from firing chamber 34, enter gas turbine 32 acting generating, enter exhaust heat boiler 25 afterwards and produce steam and hot water, the qualified steam of production enters steam turbine 31 and to do work generating, enters air from exhaust heat boiler 25 flue gas out through induced draught fan 19.Under the operating mode that ambient temperature is lower, No. four valves 4 are closed, No. five valves 5, No. ten valves 10 and ride on Bus No. 11 valve 11 are opened, air sends into air compressor 33 through blower 20 by No. five valves 5, because ambient temperature is lower, NG cannot be heated to the temperature that gas turbine 32 requires by air heater 36, needs that induced draught fan 19 partial fume is out sent to secondary heat exchanger 23 by No. ten valves 10 and heats NG.The NG temperature after flue gas is monitored by No. two thermoscopes 16, control the aperture of No. ten valves 10, thus regulating the flue gas flow sending into secondary heat exchanger 23, another part flue gas enters air through ride on Bus No. 11 valve 11, and all the other processes are similar to the higher operating mode of ambient temperature.
Secondary heat exchanger 23 receives low temperature more than NG next time in the higher operating mode of ambient temperature, realizes inlet gas cooling, improves gas turbine 32 and exerts oneself, increase generated energy; Under the lower operating mode of ambient temperature, gas turbine 32 itself is exerted oneself higher, do not need extra inlet gas cooling, and simultaneously NG cannot be heated to gas turbine 32 and require temperature by air heater 36, under this operating mode, secondary heat exchanger 23 Main Function is Mist heat recovering heating NG, makes it meet the fuel gas temperature of gas turbine 32 requirement.
The system coordination of comprehensive utilization LNG energy: the charge-cooling refrigeration duty of gas turbine 32 can be mated mutually with between freezer 28 and the refrigeration duty of ice making, improves the flexibility of LNG cold energy use.LNG amount of vaporization needed for gas turbine 32 is more stable, and the LNG cold needed for freezer 28 is by storing goods quantitative limitation, and ice making is the part the most easily regulated in cold energy use system.If do not need regulating gas turbine 32 inlet gas cooling temperature, then ice making is mainly used in regulating freezer 28 load, the cold medium flux controlling to enter freezer 28 and ice making station 29 respectively by No. eight valves 8 and No. nine valves 9 realizes, and General makes the heat exchange steady load of LNG-R717 first-class heat exchanger 22; If desired regulating gas turbine 32 inlet gas cooling temperature, then regulate the heat exchange load of first-class heat exchanger 22 by increasing or reduce ice-making capacity, thus change the heat exchange load of NG-gas turbine 32 air inlet secondary heat exchanger 23.Under accidental conditions, freezer 28 and ice making station 29 can complete by reclaiming LNG cold energy completely, and ice making can effectively regulate freezer fluctuation of load, and the air entering gas turbine 32 can be cooled preferably, and gas turbine 32 has larger capacity.
The independence of the system of comprehensive utilization LNG energy: freezer 28 and ice making station 29 have mutual independence with LNG cold energy use system, if the LNG cold energy use system failure, freezer 28 and ice making station 29 can completely by electric compression refrigerating apparatus 27 coolings for subsequent use, the gasification of LNG is realized by secondary heat exchanger 23 and air heater 36 completely, has ensured the normal supply of rock gas.In system, all wasted work equipment all can be supplied by natural gas power unit, ensure that the self-sufficient of electric energy.
The environmental protection and energy saving of the system of comprehensive utilization LNG energy: under nominal situation, needed for freezer 28 and ice making station 29, cold energy is supplied by LNG completely, compared to traditional electrical compression refrigerating apparatus 27, eliminates voltage contracting wasted work, refrigeration system energy-conservation more than 50%.Distribution of Natural formula energy source station passes through Gas-steam Combined Cycle, temperature of exhaust fume is about 160 DEG C, temperature of exhaust fume can be down to about 80 DEG C by producing hot water, then low-temperature flue gas removes the rock gas after heating and gasifying again, and flue-gas temperature can be made to continue decline 1 ~ 2 DEG C.Therefore native system flue gas loss is less, less to environmental thermal pollution.
On the one hand, in the present invention, cryogenic cold energy supply the main of low temperature level of LNG uses cold unit, then by main be difficult to utilize with cold unit more than cryogenic cold energy recycled by the distributed busbar protection with gas power device, improve LNG comprehensive utilization rate of energy source; On the other hand, the present invention by the classification heat exchanger in LNG cold energy recovery unit by the main refrigeration duty with cold unit with affect the relevant cooling procedure that gas power device exerts oneself and combine, make mainly mutually to regulate with exerting oneself of gas power device by the refrigeration duty of cold unit, effectively mate, simultaneously for ensureing security of system, stable operation, each unit all considers measure for subsequent use, the independence of each unit of effective guarantee system.Therefore, the present invention, on the basis fully utilizing LNG cold energy and heat energy, can use energy object according to different, regulate the producing level of LNG cold energy and heat energy.
In addition, it should be noted that, the specific embodiment described in this specification, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this specification is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (10)
1. fully utilize a system for LNG energy, comprise a valve (1), a flowmeter (12), LNG storage tank (21), LNG pump (26) and fuel-supply pipe (37), is characterized in that: also comprise No. two valves (2), No. four valves (4), No. seven valves (7), No. eight valves (8), No. ten valves (10), ride on Bus No. 11 valve (11), No. two flowmeters (13), No. three flowmeters (14), a thermoscope (15), No. two thermoscopes (16), feed water pump (17), refrigerant pump (18), induced draught fan (19), blower (20), first-class heat exchanger (22), secondary heat exchanger (23), vapour condenser (24), exhaust heat boiler (25), freezer (28), coolant storage tank (30), steam turbine (31), gas turbine (32), air compressor (33), firing chamber (34), alternator (35), air heater (36), flue gas supplying tube (38), flue gas exit pipe (39), smoke-ejecting pipe (40), air delivery pipe (41), steam circulating pipe (43) and refrigerant circulation pipe (45), described LNG storage tank (21), a valve (1), LNG pump (26), a flowmeter (12), first-class heat exchanger (22), secondary heat exchanger (23), air heater (36), No. two thermoscopes (16) and firing chamber (34) are connected in turn on fuel-supply pipe (37), described blower (20), No. four valves (4), secondary heat exchanger (23), No. two flowmeters (13) and air compressor (33) are connected in turn on air delivery pipe (41), described air compressor (33) is connected with firing chamber (34) by pipeline, this firing chamber (34) is connected with gas turbine (32) by pipeline, described gas turbine (32) is connected with exhaust heat boiler (25) by flue gas supplying tube (38), described exhaust heat boiler (25), induced draught fan (19), No. ten valves (10) and secondary heat exchanger (23) are connected in turn on flue gas exit pipe (39), one end of described smoke-ejecting pipe (40) is connected on the flue gas exit pipe (39) that is positioned between induced draught fan (19) and No. ten valves (10), described ride on Bus No. 11 valve (11) is arranged on smoke-ejecting pipe (40), described exhaust heat boiler (25), steam turbine (31), vapour condenser (24) and feed water pump (17) are connected in turn on steam circulating pipe (43), described steam turbine (31), alternator (35), gas turbine (32) is connected successively with air compressor (33), described No. two valves (2), first-class heat exchanger (22), No. seven valves (7), coolant storage tank (30), refrigerant pump (18), No. eight valves (8), No. three flowmeters (14) and freezer (28) are connected in turn on refrigerant circulation pipe (45), and a described thermoscope (15) is arranged on freezer (28).
2. the system of comprehensive utilization LNG energy according to claim 1, it is characterized in that: also comprise No. nine valves (9), ice making station (29) and ice making station connecting tube (46), one end of described ice making station connecting tube (46) is connected on the refrigerant circulation pipe (45) between refrigerant pump (18) and No. eight valves (8), the other end at this ice making station connecting tube (46) is connected on the refrigerant circulation pipe (45) between freezer (28) and No. two valves (2), and described No. nine valves (9) and ice making station (29) are all connected on ice making station connecting tube (46).
3. the system of comprehensive utilization LNG energy according to claim 1, it is characterized in that: also comprise No. three valves (3), electricity compression refrigerating apparatus (27), No. two bypasses (47), No. five valves (5) and a bypass (42), one end of described No. two bypasses (47) is connected on the refrigerant circulation pipe (45) between first-class heat exchanger (22) and No. seven valves (7), the other end of these No. two bypasses (47) is connected on the refrigerant circulation pipe (45) between freezer (28) and No. two valves (2), described No. three valves (3) and electric compression refrigerating apparatus (27) are all connected on No. two bypasses (47), one end of a described bypass (42) is connected on the air delivery pipe (41) between blower (20) and No. four valves (4), the other end of this bypass (42) is connected on the air delivery pipe (41) between secondary heat exchanger (23) and No. two flowmeters (13), and described No. five valves (5) are arranged on a bypass (42).
4. the system of comprehensive utilization LNG energy according to claim 1, it is characterized in that: also comprise No. six valves (6) and cool water heating pipe (44), described cool water heating pipe (44) is connected with exhaust heat boiler (25), and described No. six valves (6) are arranged on cool water heating pipe (44).
5. the method using the system as described in claim as arbitrary in Claims 1 to 4 to carry out fully utilizing LNG energy, it is characterized in that: the step of described method is: the LNG transferred out by fuel-supply pipe (37) carries out heat exchange with the air inlet in the refrigerant in refrigerant circulation pipe (45), gas turbine (32) respectively by first-class heat exchanger (22), secondary heat exchanger (23), afterwards through air heater (36) and No. two thermoscopes (16), constitute LNG cold energy recovery unit, the air that preparation enters gas turbine (32) passes through pipeline successively through blower (20), No. four valves (4), secondary heat exchanger (23), No. two flowmeters (13) enter air compressor (33), and burn after mixing with rock gas in firing chamber (34), flue gas after burning is successively through gas turbine (32), exhaust heat boiler (25), induced draught fan (19), No. ten valves (10) and secondary heat exchanger (23) enter air and/or successively through gas turbine (32), exhaust heat boiler (25), induced draught fan (19), ride on Bus No. 11 valve (11) enters air, exhaust heat boiler (25) steam is out successively through steam turbine (31) simultaneously, vapour condenser (24) and feed water pump (17), again enter exhaust heat boiler (25) afterwards and form vapor recycle, cold water is heated to be hot water after No. six valves (6) and exhaust heat boiler (25), more than form the fuel engine power generation unit with inlet gas cooling and UTILIZATION OF VESIDUAL HEAT IN, refrigerant after refrigeration first reclaims LNG cold energy and/or through No. three valves (3), electric compression refrigerating apparatus (27) through No. two valves (2), first-class heat exchanger (22) successively along pipeline, again successively through No. seven valves (7), coolant storage tank (30), refrigerant pump (18), then enter freezer (28) through No. eight valves (8), No. three flowmeters (14) and/or enter ice making station (29) refrigeration through No. nine valves (9), enter next circulation after refrigeration, above formation has the freezer unit of ice making adjustment and standby electricity refrigeration.
6. the method for comprehensive utilization LNG energy according to claim 5, is characterized in that: first by the main LNG delivery volume determining this system by the refrigeration duty of cold unit, then according to the electric motor power of the amount of natural gas determination gas power device after gasification; Otherwise, also can determine required amount of natural gas according to the electric motor power of gas power device, thus determine the LNG delivery volume of this system, then be determined mainly by the refrigeration duty of cold unit by LNG delivery volume.
7. the method for comprehensive utilization LNG energy according to claim 5, it is characterized in that: cold energy recycle process flexible ground is coordinated mutually, to meet different use energy objects, LNG gasification cold energy recycle process is divided into two-part: A. reclaims cryogenic cold energy supply refrigeration duty by first-class heat exchanger (22), and B. enters the air of gas turbine (32) in order to cooling by the remaining cryogenic cold energy of secondary heat exchanger (23) recovery; When fluctuation occurs the refrigeration duty of freezer (28), by the adjustment of ice making station (29), the LNG amount of vaporization of first-class heat exchanger (22) is made to keep stable; When needs increase combustion engine is exerted oneself, by reducing the cold medium flux of first-class heat exchanger (22), reducing its refrigeration duty, reducing the natural gas temperature entered in secondary heat exchanger (23), thus reduce the chilling temperature of gas turbine (32) air inlet, improve exerting oneself of gas turbine (32).
8. the method for comprehensive utilization LNG energy according to claim 5, it is characterized in that: system has taken into full account measure for subsequent use, mainly with cold cell failure or ambient temperature lower time, adopt air heater (36) or fume afterheat heating to ensure that LNG gasifies; When first-class heat exchanger (22) break down stop using or gas turbine (32) be operated in be less than declared working condition time, freezer (28) needs to enable electric compression refrigerating apparatus (27) for subsequent use.
9. the method for comprehensive utilization LNG energy according to claim 5, it is characterized in that: heat energy utilization process mainly comprises: acting generating in gas turbine (32) after combustion of natural gas, steam acting generating in steam turbine (31) produced by exhaust heat boiler (25), hot water produced by exhaust heat boiler (25), fume afterheat heated natural gas in secondary heat exchanger (23) under the lower operating mode of ambient temperature, flue gas loss is less, and the thermal efficiency of system is high.
10. the method for comprehensive utilization LNG energy according to claim 5, it is characterized in that: the air that blower (20) is sent have employed No. five valves (5) of playing bypass effect through No. four valves (4), secondary heat exchanger (23), when ambient temperature is lower, gas turbine (32) air inlet does not need low temperature refrigeration more than the LNG, directly enters air compressor (33) by No. five valves (5), No. two flowmeters (13); Induced draught fan (19) flue gas out, air is drained into by ride on Bus No. 11 valve (11), have employed No. ten valves (10) of playing bypass effect, when ambient temperature is lower, NG can not be heated to the temperature that gas turbine (32) requires by air heater (36), needs to make flue gas send into heating NG in secondary heat exchanger (23) through No. ten valves (10).
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Application publication date: 20160316 |