CN205243570U - System for use multipurposely LNG energy - Google Patents

Abstract

The utility model relates to a system for use multipurposely LNG energy. Still there is not a system for use multipurposely LNG energy at present. The utility model discloses a system: the LNG storage tank, a valve, the one -level heat exchanger, the second grade heat exchanger, air heater, no. Two thermo detectors and combustion chamber connect gradually on the feed of fuel pipe, exhaust -heat boiler, the draught fan, no. Ten valves and second grade heat exchanger connect gradually on the flue gas output tube, the air -blower, no. Four valves, the second grade heat exchanger, no. Two flowmeters and air compressor connect gradually on the air transportation pipe, exhaust -heat boiler, the draught fan, no. Ten valves and second grade heat exchanger connect gradually on the flue gas output tube, exhaust -heat boiler, steam turbine, condenser and water -feeding pump connect gradually on the steam circulating pipe, no. Two valves, the one -level heat exchanger, the refrigerant storage tank, the refrigerant pump, no. Eight valves, no. Three flowmeters and freezer connect gradually on the refrigerant circulating pipe. The utility model provides a LNG cold energy and heat energy are by make full use of.

Description

A kind of system that fully utilizes LNG energy

Technical field

The utility model relates to a kind of system of the LNG of comprehensive utilization energy, and the natural gas after main utilization gasification generates electricity and heat supply, belongs to the comprehensive utilization technique of LNG cold energy and heat energy.

Background technology

Liquefied natural gas (LNG) is the super-low liquid of-162 DEG C under normal pressure, produce 1 ton of LNG and need the about 850kWh of electric energy, the LNG of 1 ton is from-162 DEG C of gasifications to 0 DEG C, can discharge the cold of 230～240kWh, if so large cold is recycled, there are very considerable economic and social benefits.

Open day is on 09 01st, 2010, the patent No. is in the Chinese patent of 200920238201.X, a kind of freezer running gear that utilizes cold energy of liquefied natural gas refrigeration is disclosed, this freezer running gear uses liquefied ammonia as refrigerant, reclaim LNG cold energy for freezer refrigerating by liquefied ammonia and LNG direct heat transfer, the cold energy of LNG can be used to-25～-30 DEG C from-162 DEG C, effectively extract the cold energy of LNG for freezer cooling, also to have adopted the cold-working of voltage contraction be low-temperature receiver for subsequent use to freezer simultaneously. But this patent has only been considered LNG cold energy use system, do not consider the comprehensive utilization of the rear natural gas heat energy of LNG gasification.

Open day is on October 02nd, 2013, application number is in 201310295858.0 Chinese patent, a kind of LNG energy comprehensive utilization system is disclosed, in this utilization system, first by cold energy reclaimer, LNG cold energy is reclaimed and is stored in cold accumulating device by ice, then cold energy is passed to air conditioner cold water by cold accumulating device by ice, gives 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, belong to 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 frigiopyretic dysentery method.

Combustion machine is exerted oneself very responsive to atmospheric temperature, and atmospheric temperature rising can cause compressor pressure ratio to decline, and compressor consumption rate merit increases, and MAF reduces, and the effective merit of unit declines. General atmosphere temperature rising 1K, combustion machine power output reduces approximately 1%, and 10 DEG C of every reductions of air themperature, Gas Turbine Output on average increases by 10%, system effectiveness also can improve 2% left and right, therefore fire the cooling ability of exerting oneself that can effectively improve combustion machine of machine air inlet, especially for the combustion machine operating under summer condition.

Utility model content

The purpose of this utility model is the problem in order to solve LNG cold energy and heat integration difficulty, and a kind of system of the LNG of comprehensive utilization energy is provided. This system is by recycling LNG cold energy with cold unit, then the natural gas after gasification enters gas power device combustion power generation and UTILIZATION OF VESIDUAL HEAT IN, LNG cold energy and the heat energy of supplying with this system are fully utilized, do not have unnecessary natural gas to return to main gas pipe network, system is exported unnecessary electric power and hot water or cold water, and low-temperature flue gas enters atmosphere.

The technical scheme in the invention for solving the above technical problem is: the system of this comprehensive utilization LNG energy comprises valve No. one, a flowmeter, LNG storage tank, LNG pump and fuel-supply pipe, its design feature is: also comprise valve No. two, 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 thermo detector, No. two thermo detectors, feed pump, refrigerant pump, air-introduced machine, air blast, first-class heat exchanger, secondary heat exchanger, condenser, waste heat boiler, freezer, coolant storage tank, steam turbine, gas turbine, air compressor, combustion chamber, alternating current generator, air heater, flue gas input pipe, flue gas efferent duct, smoke exhaust 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 thermo detectors and combustion chamber are connected in turn on fuel-supply pipe, described air blast, 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 combustion chamber by pipeline, this combustion chamber is connected with gas turbine by pipeline, and described gas turbine is connected with waste heat boiler by flue gas input pipe, described waste heat boiler, air-introduced machine, No. ten valves and secondary heat exchanger are connected in turn on flue gas efferent duct, and one end of described smoke exhaust pipe is connected on the flue gas efferent duct between air-introduced machine and No. ten valves, described ride on Bus No. 11 valve installation on smoke exhaust pipe, described waste heat boiler, steam turbine, condenser and feed pump are connected in turn on steam circulating pipe, described steam turbine, alternating current generator, 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 thermo detector is arranged on freezer.

As preferably, the utility model also comprises valve, ice making station and ice making station tube connector No. nine, one end of described ice making station tube connector is connected on the refrigerant circulation pipe between refrigerant pump and No. eight valves, the other end of this ice making station tube connector 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 tube connector of ice making station.

As preferably, the utility model 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 utility model also comprises No. five valves and a bypass, one end of a described bypass is connected on the air delivery pipe between air blast 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 utility model also comprises No. six valves and cool water heating pipe, and described cool water heating pipe is connected with waste heat boiler, and described No. six valve installations are on cool water heating pipe.

A kind of method that uses described system to fully utilize LNG energy, its feature is: the step of described method is: the LNG transferring out by fuel-supply pipe by first-class heat exchanger, secondary heat exchanger respectively with refrigerant circulation pipe in refrigerant, the air inlet in gas turbine carry out heat exchange, pass through afterwards air heater and No. two thermo detectors, formed LNG cold energy recovery unit, the air that preparation enters gas turbine passes through air blast successively by pipeline, No. four valves, secondary heat exchanger, No. two flowmeter enters air compressor, and burn after mixing with natural gas in combustion chamber, flue gas after burning passes through gas turbine successively, waste heat boiler, air-introduced machine, No. ten valves and secondary heat exchanger enter atmosphere and/or pass through successively gas turbine, waste heat boiler, air-introduced machine, ride on Bus No. 11 valve enters atmosphere, waste heat boiler steam out passes through steam turbine successively simultaneously, condenser and feed pump, again enter afterwards waste heat boiler and form vapor recycle, cold water is heated to be hot water after No. six valves and waste heat boiler, more than form the fuel engine power generation unit with the cooling and UTILIZATION OF VESIDUAL HEAT IN of air inlet, refrigerant after refrigeration first reclaims LNG cold energy through No. two valves, first-class heat exchanger and/or through No. three valves, electric compression refrigerating apparatus successively along pipeline, again successively through No. seven valves, coolant storage tank, refrigerant pump, then enter freezer and/or enter ice making station refrigeration through No. nine valves through No. eight valves, No. three flowmeters, after refrigeration, enter next circulation, above formation has the freezer unit that ice making regulates and electricity for subsequent use freezes.

As preferably, first the utility model determines the LNG quantity delivered of this system by the refrigeration duty of the cold unit of main use, then determines the installed capacity of gas power device according to the amount of natural gas after gasification; Otherwise, also can determine required amount of natural gas according to the installed capacity of gas power device, thereby determine the LNG quantity delivered of this system, then determine the mainly refrigeration duty with cold unit by LNG quantity delivered.

As preferably, the utility model cold energy recycle process is coordinated neatly mutually, to meet different use energy objects, LNG gasification cold energy recycle process is divided into two parts: A. reclaims cryogenic cold energy by first-class heat exchanger and supplies with refrigeration duty, and B. reclaims remaining cryogenic cold energy in order to the cooling air that enters gas turbine by secondary heat exchanger; In the time that fluctuation occurs the refrigeration duty of freezer, by the adjusting at ice making station, make the LNG amount of vaporization of first-class heat exchanger keep stable; In the time that needs increase combustion machine is exerted oneself, by reducing the cold medium flux of first-class heat exchanger, reduce its refrigeration duty, reduce the natural gas temperature entering in secondary heat exchanger, thereby reduce the chilling temperature of gas turbine inlet air, improve exerting oneself of gas turbine.

As preferably, system of the present utility model has taken into full account measure for subsequent use, when lower, adopts air heater or fume afterheat to heat to ensure that LNG gasifies main by cold cell failure or environment temperature; Stop using or gas turbine is operated in while being less than declared working condition when first-class heat exchanger breaks down, freezer need to be enabled electric compression refrigerating apparatus for subsequent use.

As preferably, the utility model heat energy utilization process mainly comprises: acting generating in gas turbine after combustion of natural gas, waste heat boiler is produced the steam generating of doing work in steam turbine, waste heat boiler is produced hot water, under the lower operating mode of environment temperature, fume afterheat heats natural gas in secondary heat exchanger, flue gas loss is less, and the thermal efficiency of system is high.

As preferably, the air that the utility model air blast is sent is adopting through No. four valves, secondary heat exchangers No. five valves that play bypass effect, in the time that environment temperature is lower, gas turbine inlet air does not need, through sub-cooled more than LNG, directly to enter air compressor by No. five valves, No. two flowmeters; Air-introduced machine flue gas out, drain into atmosphere by ride on Bus No. 11 valve, adopted No. ten valves that play bypass effect, in the time that environment temperature is lower, air heater can not be heated to NG the temperature of gas turbine requirement, need to make flue gas send into and in secondary heat exchanger, heat NG through No. ten valves.

The utility model compared with prior art, has the following advantages and effect: this system is mainly made up of LNG cold energy recovery unit, the cold unit of main use that utilizes LNG cold energy, the distributed energy station with gas power device and low-grade cooling and heating load unit. Whole system is first recycled LNG cold energy, then the generating of the combustion of natural gas after gasification and UTILIZATION OF VESIDUAL HEAT IN, mainly mate with the required LNG amount of vaporization in cold unit and gas power device consumption amount of natural gas moment, LNG cold energy and the heat energy of supplying with this system are fully utilized, do not have unnecessary natural gas to return to main gas pipe network, system is exported unnecessary electric power and hot water or cold water, and low-temperature flue gas enters atmosphere.

The main cryogenic cold energy with cold unit by using LNG, natural gas temperature after utilization is-40 DEG C of left and right, remaining this part remaining cryogenic cold energy is difficult to by the cold unit by using of low temperature main, but can recycle by the distributed energy station 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 parts: 1. by LNG and the heat exchange of low temperature refrigerant, reclaiming the cryogenic cold energy of LNG supplies with mainly with cold unit (low temperature cold load), after utilizing, LNG gasifies into about the natural gas of-40 DEG C, and remaining this part remaining cryogenic cold energy is difficult to be utilized by low temperature cold load; 2. the remaining cryogenic cold energy that reclaims LNG by the air inlet heat exchange of NG and gas power device, in order to the cooling air (remaining low temperature cold load) that enters gas power device, improves generated output. The utilization of LNG heat energy mainly realizes by gas power device generating and UTILIZATION OF VESIDUAL HEAT IN in distributed energy station.

Cold energy use is combined with gas power device generated output, by regulating the low temperature cold of the cold unit of main use load the intake air temperature of regulating gas power set, thus realize by LNG cold energy between low temperature cold load and remaining low temperature cold load mutually coupling reach the object that regulating gas power set are exerted oneself.

Mainly reclaim the cryogenic cold energy of LNG by the heat exchange of low temperature refrigerant with cold unit, but for ensureing that mainly the cooling with cold unit is stable, need a set of electric compression refrigerating apparatus for subsequent use, normally gasify at LNG, in the situation that without interruption, mainly all supplied with by LNG with the required cold energy in cold unit, only in the time that LNG can not regular supply, open electric compression refrigerating apparatus for subsequent use.

Self-regulation system by the cold unit of main use is stablized refrigeration duty, also can stablize LNG amount of vaporization by the coupling between low temperature cold load in LNG cold energy recovery unit and remaining low temperature cold load. Because gas power device generating requires gas supply steady, and mainly may fluctuate because of the variation of refrigeration duty by the required LNG cryogenic cold energy in cold unit, as the refrigeration duty of freezer can fluctuate along with the variation of warehouse goods amount, the preparation amount of dry ice can regulate preparation amount because of the market demand. Therefore in order to ensure LNG gasification continuously, mainly need to build supporting refrigeration duty regulating system with cold unit and carry out equilibrium fluctuations, as freezer can be by coordinating ice making to stablize refrigeration duty.

On the basis of the hot and cold total energy approach of LNG, system has taken into full account various measures for subsequent use, ensures security of system, stable operation under different operating modes. When mainly with cold cell failure or stoppage in transit, adopt the fume afterheat of air heater or gas power device to ensure LNG gasification; In the time of LNG cold energy recovery unit fault or gas power device stoppage in transit, adopt electricity refrigeration for subsequent use to supply with and mainly use cold unit.

By regulating the low temperature cold of the cold unit of main use load the intake air temperature of regulating gas power set, thus realize by LNG cold energy between low temperature cold load and remaining low temperature cold load mutually coupling reach the object that regulating gas power set are exerted oneself. Because being divided into cryogenic cold energy, LNG cold energy recovery unit supplies with mainly by cold unit and remaining cryogenic cold energy the cooling two parts of gas power device air inlet, can by regulate mainly with in cold unit with the cold medium flux of LNG heat exchange, regulate LNG to supply with the cold energy size of low temperature cold load, thereby regulate the outlet temperature of the natural gas after low temperature cold load cooling, also the natural gas temperature of supplying with remaining low temperature load, regulates the intake air temperature of gas power device thereby realize. This method not only can regulating gas power set intake air temperature, is also to solve because of main to cause gasify a kind of method of fluctuation problem of LNG with the fluctuation of cold unit refrigeration duty.

Brief description of the drawings

Fig. 1 is the principle schematic that fully utilizes the system of LNG energy in the utility model embodiment.

Fig. 2 is the structural representation that fully utilizes the system of LNG energy in the utility model embodiment.

Detailed description of the invention

Below in conjunction with accompanying drawing and by embodiment, the utility model is described in further detail, and following examples are to explanation of the present utility model and the utility model is not limited to following examples.

Embodiment.

Referring to Fig. 1 to Fig. 2, the system that fully utilizes LNG energy in the present embodiment comprises valve 1 No. one, 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 thermo detector 15, No. two thermo detectors 16, feed pump 17, refrigerant pump 18, air-introduced machine 19, air blast 20, LNG storage tank 21, first-class heat exchanger 22, secondary heat exchanger 23, condenser 24, waste 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, combustion chamber 34, alternating current generator 35, air heater 36, fuel-supply pipe 37, flue gas input pipe 38, flue gas efferent duct 39, smoke exhaust 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 tube connector 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 thermo detectors 16 and combustion chamber 34 are connected in turn on fuel-supply pipe 37, air blast 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 combustion chamber 34 by pipeline, this combustion chamber 34 is connected with gas turbine 32 by pipeline, and gas turbine 32 is connected with waste heat boiler 25 by flue gas input pipe 38, waste heat boiler 25, air-introduced machine 19, No. ten valves 10 and secondary heat exchanger 23 are connected in turn on flue gas efferent duct 39, and one end of smoke exhaust pipe 40 is connected on the flue gas efferent duct 39 between air-introduced machine 19 and No. ten valves 10, and ride on Bus No. 11 valve 11 is arranged on smoke exhaust pipe 40, waste heat boiler 25, steam turbine 31, condenser 24 and feed pump 17 are connected in turn on steam circulating pipe 43, steam turbine 31, alternating current generator 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 No. one thermo detector 15 is arranged on freezer 28.

One end of ice making station tube connector 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 tube connector 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 tube connector 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 air blast 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 valve 5 is arranged in a bypass 42. Cool water heating pipe 44 is connected with waste heat boiler 25, and No. six valve 6 is arranged on cool water heating pipe 44.

The step that uses the system of comprehensive utilization LNG energy to fully utilize the method for LNG energy in the present embodiment is: the LNG transferring out by fuel-supply pipe 37 by first-class heat exchanger 22, secondary heat exchanger 23 respectively with refrigerant circulation pipe 45 in refrigerant, the air inlet in gas turbine 32 carry out heat exchange, pass through afterwards air heater 36 and No. two thermo detectors 16, formed LNG cold energy recovery unit, the air that preparation enters gas turbine 32 passes through air blast 20 successively by pipeline, No. four valves 4, secondary heat exchanger 23, No. two flowmeter 13 enters air compressor 33, and burn after mixing with natural gas in combustion chamber 34, flue gas after burning passes through gas turbine 32 successively, waste heat boiler 25, air-introduced machine 19, No. ten valves 10 and secondary heat exchanger 23 enter atmosphere and/or pass through successively gas turbine 32, waste heat boiler 25, air-introduced machine 19, ride on Bus No. 11 valve 11 enters atmosphere, waste heat boiler 25 steam out passes through steam turbine 31 successively simultaneously, condenser 24 and feed pump 17, again enter afterwards waste heat boiler 25 and form vapor recycle, cold water is heated to be hot water after No. six valves 6 and waste heat boiler 25, more than form the fuel engine power generation unit with the cooling and UTILIZATION OF VESIDUAL HEAT IN of air inlet, refrigerant after refrigeration first reclaims LNG cold energy through No. two valves 2, first-class heat exchanger 22 and/or through No. three valves 3, electric compression refrigerating apparatus 27 successively along pipeline, again successively through No. seven valves 7, coolant storage tank 30, refrigerant pump 18, then enter freezer 28 and/or enter ice making station 29 through No. nine valves 9 and freeze through No. eight valves 8, No. three flowmeters 14, after refrigeration, enter next circulation, above formation has the freezer unit that ice making regulates and electricity for subsequent use freezes.

Cold energy recycle process is coordinated neatly mutually, to meet different use energy objects, LNG gasification cold energy recycle process is divided into two parts: A. reclaims cryogenic cold energy by first-class heat exchanger 22 and supplies with refrigeration duty, and B. reclaims remaining cryogenic cold energy in order to the cooling air that enters gas turbine 32 by secondary heat exchanger 23; In the time that fluctuation occurs the refrigeration duty of freezer 28, by the adjusting at ice making station 29, make the LNG amount of vaporization of first-class heat exchanger 22 keep stable; In the time that needs increase combustion machine is exerted oneself, by reducing the cold medium flux of first-class heat exchanger 22, reduce its refrigeration duty, reduce the natural gas temperature entering in secondary heat exchanger 23, thereby reduce the chilling temperature of gas turbine 32 air inlets, improve exerting oneself of gas turbine 32. Certainly, while there is fluctuation in the refrigeration duty of freezer 28, if in fluctuation range hour, also can not regulate by ice making, result can cause the intake air temperature of gas turbine 32 to change, the fluctuation in more among a small circle of exerting oneself of gas turbine 32, specifically tackles the mode of freezer 28 load fluctuations and need to select according to actual conditions.

When lower, adopt air heater 36 or fume afterheat to heat to ensure that LNG gasifies by cold cell failure or environment temperature main; Stop using or gas turbine 32 is operated in while being less than declared working condition when first-class heat exchanger 22 breaks down, freezer 28 need to be enabled 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, waste heat boiler 25 is produced the steam generating of doing work in steam turbine 31, waste heat boiler 25 is produced hot water, under the lower operating mode of environment temperature, fume afterheat heats natural gas in secondary heat exchanger 23, flue gas loss is less, and the thermal efficiency of system is high.

The air that air blast 20 is sent is adopting through No. four valves 4, secondary heat exchangers 23 No. five valves 5 that play bypass effect, in the time that environment temperature is lower, gas turbine 32 air inlets do not need through sub-cooled more than LNG, directly enter air compressor 33 by No. five valves 5, No. two flowmeters 13; Air-introduced machine 19 flue gas out, drain into atmosphere by ride on Bus No. 11 valve 11, No. ten valves 10 that play bypass effect are adopted, in the time that environment temperature is lower, air heater 36 can not be heated to NG the temperature that gas turbine 32 requires, and need to make flue gas send in secondary heat exchanger 23 and heat NG through No. ten valves 10.

The LNG amount of vaporization consuming according to gas turbine 32 in the present embodiment designs the refrigeration duty scale of freezer 28. Cold energy and the comprehensive utilization system for heat energy of LNG mainly comprises (a) LNG accumulating unit; (b) heat exchanger unit of LNG cold energy removal process; (c) there is the freezer unit that ice making regulates and electricity for subsequent use freezes; (d) there is the gas turbine power generation unit of the cooling and UTILIZATION OF VESIDUAL HEAT IN of air inlet.

LNG accumulating unit mainly comprises: carry the LNG coming to enter LNG storage tank 21 by tank car or LNG conveyance conduit, the gasification flow that regulates LNG by flowmeter 12 and LNG pump 26, the gasification flow of LNG depends primarily on the size that gas turbine 32 is loaded.

LNG cold energy removal process heat exchanger unit comprises: the first-class heat exchanger 22 of LNG and refrigerant R717 heat exchange, the secondary heat exchanger 23 of NG and gas turbine 32 air inlet heat exchange, air heater 36 for subsequent use, and No. two thermo detectors 16. The flow that the refrigeration duty of first-class heat exchanger 22 and secondary heat exchanger 23 can enter refrigerant R717 in first-class heat exchanger 22 by control regulates, and mutually mates thereby realize refrigeration duty between two-stage heat exchanger.

First the effect of air heater 36 is for subsequent use as LNG heating and gasifying, stops transport or when first-class heat exchanger 22 breaks down, is directly used for heating the natural gas temperature that LNG requires to gas turbine 32 at freezer 28; Secondly, freezer 28LNG cooling and gas turbine 32 air inlets cooling between in the mutual adjustment process of cold energy, because the excursion of the excess air coefficient of gas turbine 32 is less, in the time 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 further to heat. Natural gas temperature after No. two thermo detector 16 monitoring gasifications, thus the flue gas flow in air mass flow or the secondary heat exchanger 23 of adjusting air heater 36 makes natural gas temperature meet the requirement of gas turbine 32.

There is the freezer unit that ice making regulates and electricity for subsequent use freezes: freezer unit is the basic refrigeration duty in the present embodiment, the present embodiment is by the scale of the installed capacity design freezer 28 of gas turbine 32, supporting ice making station 29 is used for regulating the refrigeration duty of freezer 28 simultaneously, electricity compression refrigerating apparatus 27, as the unit for subsequent use of freezer 28, is enabled in the time that 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 boosting, refrigerant pump 18 sends into freezer 28, a thermo detector 15 is monitored the temperature of freezer 28, No. three flowmeters 14 are monitored the flow of refrigerant, regulate the unlatching size of No. eight valves 8 according to the variation of storehouse temperature, thereby control the cold medium flux that enters freezer 28; During when the refrigeration duty generation fluctuation of freezer 28 or lower than Design cooling load, No. nine valve 9 is 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, by ice making this part cold energy of dissolving. The refrigerant R717 discharging after cold energy turns back to condensation in first-class heat exchanger 22, starts next circulation.

There is the gas turbine power generation unit of the cooling and UTILIZATION OF VESIDUAL HEAT IN of air inlet: under the higher operating mode of environment temperature, natural gas (NG) side of gas turbine 32, from first-class heat exchanger 22, NG out enters secondary heat exchanger 23, remaining cryogenic cold energy is discharged to the air inlet of cooling gas turbine 32, then NG enters in air heater 36 and is further heated to the required temperature of gas turbine 32, and the combustion chamber 34 that enters afterwards gas turbine 32 participates in burning. The air side of gas turbine 32, No. five valves 5 and No. six valves 6 are closed, No. four valve 4 is opened, air is sent to secondary heat exchanger 23 through air blast 20 and is cooled, No. two flowmeters 13 are measured air mass flow simultaneously, thereby by the excess air coefficient of air blast 20 regulating gas turbines 32, air is after secondary heat exchanger 23 is cooling, enter compression in air compressor 33, then enter in combustion chamber 34 and participate in burning. Gas turbine 32 fume side, No. ten valve 10 is closed, ride on Bus No. 11 valve 11 is opened, from combustion chamber 34 flue gas out, enter gas turbine 32 acting generatings, enter afterwards waste heat boiler 25 and produce steam and hot water, the qualified steam of production enters steam turbine 31 acting generatings, enters atmosphere from waste heat boiler 25 flue gas out through air-introduced machine 19. Under the lower operating mode of environment temperature, No. four valve 4 is closed, No. five valves 5, No. ten valves 10 and ride on Bus No. 11 valve 11 are opened, air is sent into air compressor 33 through air blast 20 by No. five valves 5, because environment temperature is lower, air heater 36 cannot be heated to NG the temperature that gas turbine 32 requires, and air-introduced machine 19 partial fume out need to be sent to secondary heat exchanger 23 by No. ten valves 10 and heat NG. Monitor the NG temperature after flue gas by No. two thermo detectors 16, control the aperture of No. ten valves 10, thereby regulate the flue gas flow of sending into secondary heat exchanger 23, another part flue gas enters atmosphere through ride on Bus No. 11 valve 11, and all the other processes are similar to the higher operating mode of environment temperature.

Secondary heat exchanger 23 is received low temperature more than NG next time in the higher operating mode of environment temperature, realizes air inlet cooling, improves gas turbine 32 and exerts oneself, and increases generated energy; Under the lower operating mode of environment temperature, gas turbine 32 itself is exerted oneself higher, do not need extra air inlet cooling, and simultaneously air heater 36 cannot be heated to NG gas turbine 32 and requires temperature, under this operating mode, secondary heat exchanger 23 Main Functions are Mist heat recovering heating NG, make it meet the fuel gas temperature that gas turbine 32 requires.

The system coordination of comprehensive utilization LNG energy: can mutually mate between the charge-cooling refrigeration duty of gas turbine 32 and freezer 28 and the refrigeration duty of ice making, improve the flexibility of LNG cold energy use. The required LNG amount of vaporization of gas turbine 32 is more stable, and the required LNG cold of freezer 28 is stored goods quantitative limitation, and ice making is the part the most easily regulating in cold energy use system. If do not need regulating gas turbine 32 air inlet chilling temperatures, ice making is mainly used in regulating freezer 28 to load, control respectively by No. eight valves 8 and No. nine valves 9 cold medium flux that enters freezer 28 and ice making station 29 and realize, resultant effect makes the heat exchange steady load of LNG-R717 first-class heat exchanger 22; If desired regulating gas turbine 32 air inlet chilling temperatures, regulate the heat exchange load of first-class heat exchanger 22 by increasing or reduce ice-making capacity, thereby change the heat exchange load of NG-gas turbine 32 air inlet secondary heat exchangers 23. Under accidental conditions, freezer 28 and ice making station 29 can be completely complete by reclaiming LNG cold energy, and ice making can effectively regulate freezer load fluctuation, and the air that enters gas turbine 32 can obtain cooling preferably, and gas turbine 32 has the larger ability of exerting oneself.

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 be completely by electric compression refrigerating apparatus 27 coolings for subsequent use, the gasification of LNG realizes by secondary heat exchanger 23 and air heater 36 completely, has ensured the normal supply of natural gas. In system, all wasted work equipment all can be supplied with by natural gas power unit, has ensured the self-sufficient of electric energy.

The environmental protection and energy saving of the system of comprehensive utilization LNG energy: under nominal situation, the required cold energy of freezer 28 and ice making station 29 is supplied with by LNG completely, than traditional electrical compression refrigerating apparatus 27, has saved voltage contracting wasted work, and refrigeration system is energy-conservation more than 50%. Distribution of Natural formula energy source station passes through Gas-steam Combined Cycle, exhaust gas temperature is about 160 DEG C, exhaust gas temperature can be down to 80 DEG C of left and right by producing hot water, then low-temperature flue gas removes the natural gas after heating and gasifying again, can make flue-gas temperature continue to decline 1～2 DEG C. Therefore native system flue gas loss is less, less to environmental thermal pollution.

On the one hand, in the utility model, the cryogenic cold energy of LNG is supplied with the cold unit of low temperature level main, then by mainly recycling by the distributed energy station with gas power device by the remaining cryogenic cold energy that cold unit is difficult to utilize, improve LNG comprehensive utilization rate of energy source; On the other hand, the utility model by the classification heat exchanger in LNG cold energy recovery unit by mainly by the refrigeration duty of cold unit with affect the relevant cooling procedure that gas power device exerts oneself and combine, make mainly can mutually regulate, effectively mate with exerting oneself of gas power device by the refrigeration duty of cold unit, simultaneously for ensureing security of system, stable operation, measure for subsequent use has all been considered in each unit, the independence of the each unit of effective guarantee system. Therefore, the utility model, on the basis of comprehensive utilization LNG cold energy and heat energy, can, according to different use energy objects, regulate the degree of utilizing of LNG cold energy and heat energy.

In addition, it should be noted that, the specific embodiment described in this description, shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this description is only to the explanation of the utility model structure example. All equivalence variation or simple change of doing according to described structure, feature and the principle of the utility model patent design, are included in the protection domain of the utility model patent. The utility model person of ordinary skill in the field can make various amendments or supplements or adopt similar mode to substitute described specific embodiment; only otherwise depart from structure of the present utility model or surmount this scope as defined in the claims, all should belong to protection domain of the present utility model.

Claims (5)

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 thermo detector (15), No. two thermo detectors (16), feed pump (17), refrigerant pump (18), air-introduced machine (19), air blast (20), first-class heat exchanger (22), secondary heat exchanger (23), condenser (24), waste heat boiler (25), freezer (28), coolant storage tank (30), steam turbine (31), gas turbine (32), air compressor (33), combustion chamber (34), alternating current generator (35), air heater (36), flue gas input pipe (38), flue gas efferent duct (39), smoke exhaust 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), it is upper that No. two thermo detectors (16) and combustion chamber (34) are connected to fuel-supply pipe (37) in turn, described air blast (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 combustion chamber (34) by pipeline, this combustion chamber (34) is connected with gas turbine (32) by pipeline, described gas turbine (32) is connected with waste heat boiler (25) by flue gas input pipe (38), described waste heat boiler (25), air-introduced machine (19), No. ten valves (10) and secondary heat exchanger (23) are connected in turn on flue gas efferent duct (39), one end of described smoke exhaust pipe (40) is connected on the flue gas efferent duct (39) being positioned between air-introduced machine (19) and No. ten valves (10), it is upper that described ride on Bus No. 11 valve (11) is arranged on smoke exhaust pipe (40), described waste heat boiler (25), steam turbine (31), it is upper that condenser (24) and feed pump (17) are connected to steam circulating pipe (43) in turn, described steam turbine (31), alternating current generator (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), it is upper that No. three flowmeters (14) and freezer (28) are connected to refrigerant circulation pipe (45) in turn, and a described thermo detector (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 tube connector (46), one end of described ice making station tube connector (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 tube connector (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 tube connector (46).

3. the system of comprehensive utilization LNG energy according to claim 1, it is characterized in that: also comprise No. three valves (3), electric compression refrigerating apparatus (27) and No. two bypasses (47), 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), and described No. three valves (3) and electric compression refrigerating apparatus (27) are all connected in No. two bypasses (47).

4. the system of comprehensive utilization LNG energy according to claim 1, it is characterized in that: also comprise No. five valves (5) and a bypass (42), one end of a described bypass (42) is connected on the air delivery pipe (41) between air blast (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 in a bypass (42).

5. 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 waste heat boiler (25), and described No. six valves (6) are arranged on cool water heating pipe (44).