CN109931732A - A kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy - Google Patents
A kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy Download PDFInfo
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- CN109931732A CN109931732A CN201811395686.3A CN201811395686A CN109931732A CN 109931732 A CN109931732 A CN 109931732A CN 201811395686 A CN201811395686 A CN 201811395686A CN 109931732 A CN109931732 A CN 109931732A
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Abstract
The present invention relates to a kind of multi-stage temperature refrigerator system, the high-adaptability cold-storage multi-stage temperature refrigerator system of especially a kind of cascade utilization LNG cold energy.The present invention realizes the cascade utilization to LNG cold energy, improves LNG cold energy use rate；According to the automatic control system of optimization, the flow of refrigerant can be adjusted in real time to achieve the purpose that control temperature of ice house；Any collocation operation that a variety of cooling supply modes are realized by the opening and closing of solenoid valve solves the stability problem of the freezer operation using LNG refrigeration；Cold-storage can be carried out by cold accumulation system, the cold energy of storage is released again in low peak period or the high electricity price of natural gas supply, reduces the operating cost of system；It is added to gas-liquid separator, ensure that the normal operation of refrigerant pump and the higher heat exchange efficiency of evaporator；The refrigerant R32 and liquefied ammonia of selection have very high friendly to environment；There is freezing by change of state using refrigerant, can make full use of refrigerant gasification latent heat refrigeration, reduce cold medium flux.
Description
Technical field
The present invention relates to a kind of multi-stage temperature refrigerator system, especially a kind of high-adaptability cold-storage of cascade utilization LNG cold energy is more
Warm refrigeration storage system.
Background technique
Since the pollutant that natural gas discharges in combustion is seldom, China quickly increases the demand of natural gas at present
It is long, it is that convenient transportation natural gas can generally be liquefied as LNG.LNG can be vaporized in supply user before in Vaporizing Station,
The cold energy of about 830KJ/kg can be released during this, and this part cold energy can generally be taken away by air or seawater, not only make
Certain influence can be also generated to environmental ecology at great energy waste.Currently the mode of LNG cold energy use mainly includes
Cold energy generation, low-temperature grinding, lighter hydrocarbons recovery, produces liquid CO at air separation2Or dry ice, sea water desalination, ice making, freezer, air-conditioning
It is different Deng, the temperature as needed for different cold energy use modes, it needs to carry out LNG cold energy to improve the utilization rate of LNG cold energy
The cold energy use mode of cascade utilization, i.e., a variety of different temperatures demands successively utilizes LNG cold energy, and raw in actual industrial
It is difficult to find the case history that cold energy cascade utilization may be implemented in production.
For freezer as power consumption rich and influential family, freezer power consumption expense has accounted for 50% or more of entire freezer operating cost, and due to
Temperature of ice house needed for different product is different, and freezer is often designed as multi-stage temperature refrigerator when building, to meet the system of different product
Cold demand, temperature of ice house range are -60 DEG C -5 DEG C, if the cold energy of LNG is applied in multi-stage temperature refrigerator, LNG may be implemented
The cascade utilization of cold energy improves the utilization efficiency of LNG cold energy.Current LNG cold energy for refrigeration storage system there are the problem of have: supply
Cold mode is single, and system is low to load variations adaptability；Refrigerant and LNG single-stage exchange heat, and LNG cold energy use rate is low；It is not added with storage
Device for cooling, LNG supply are difficult to adjust when unstable；Freezer the degree of automation is not high；Refrigerant uses phase-change-free refrigeration, cold medium flux
Greatly；
Summary of the invention
In order to overcome LNG cold energy use insufficient, system is weak to load and LNG supply variation adaptability and voltage contracts
Freeze bring high power consumption the problems such as, the invention proposes how warm a kind of high-adaptability cold-storage of cascade utilization LNG cold energy is
Refrigeration storage system.The present invention realizes the cascade utilization to LNG cold energy, improves LNG cold energy use rate；Automatic control according to optimization
System processed can adjust the flow of refrigerant in real time not only to achieve the purpose that control temperature of ice house, additionally it is possible to realize a variety of cooling supply
It is run while mode, solves the stability problem of the freezer operation using LNG refrigeration；Natural gas supply peak period or
When low electricity price, the cold accumulation system that can design through the invention carries out cold-storage, low peak period or high electricity price in natural gas supply
When the cold energy of storage is released again, reduce the operating cost of system.
The technical solution adopted by the present invention is that:
A kind of high-adaptability multi-stage temperature refrigerator system that can make full use of LNG cold energy, it includes LNG gasification system, and freezing-is super
Low temperature parallel connection refrigeration storage system utilizes the R32 cycle refrigeration system of LNG cold energy, R32 cold accumulation system, R32 vapor-compression refrigerant cycle
System, refrigerated merchandiser systems utilize the ammonia cycle refrigeration system of LNG cold energy, ice-storage system, ammonia vapor-compression refrigerant cycle system
System；Wherein,
(1) above-mentioned LNG gasification system, including LNG-R32 heat exchanger, LNG-ammonia heat exchanger, heating power expansion valve, electromagnetism
Valve, check-valves, natural gas transportation pipe network, the liquefied natural gas-R32 heat exchanger refrigerant output and input piping connection
It is the R32 cycle refrigeration system using LNG cold energy, the LNG-liquefied ammonia heat exchanger refrigerant outputs and inputs piping connection
The liquefied ammonia cycle refrigeration system using LNG cold energy, the heating power expansion valve can be adjusted according to the heat-exchange temperature of setting into
Enter the LNG stream amount of heat exchanger, the solenoid valve can adjust LNG heat exchange mode, the non-return according to freezer operating mode
Valve can prevent low pressure pipeline refrigerant return.
(2) above-mentioned freezing-ultralow temperature parallel connection refrigeration storage system, solenoid valve and temperature control including connecting threeway valve outlet
Device connects the heating power expansion valve of freezer pipeline electromagnetic valve outlet, connects the freezer of thermal expansion valve outlet, connects freezer
The pressure-regulating valve of outlet, the multiple-way valve of connection pressure-regulating valve outlet, connects the throttling of ultralow cold storage pipeline electromagnetic valve outlet
Valve, the gas-liquid separator of connection throttling valve outlet, connects solenoid valve, check-valves and the multiple-way valve of gas-liquid separator gaseous phase outlet,
The heating power expansion valve of gas-liquid separator liquid-phase outlet is connected, the ultralow cold storage of thermal expansion valve outlet is connected, connects ultralow cold storage
The solenoid valve of outlet, connects the multiple-way valve of electromagnetic valve outlet, and the gas-liquid separator is used to guarantee complete into the refrigerant of evaporator
Portion exists with liquid form, and the solenoid valve and temperature sensor are stablized for adjusting temperature of ice house, and the heating power expansion valve is used
In adjusting cold medium flux, the throttle valve is used to cool down to refrigerant, and the pressure-regulating valve is used to be depressured to refrigerant.
(3) the above-mentioned R32 cycle refrigeration system using LNG cold energy, LNG-R32 including connecting multi-pass valve outlet are changed
Hot device connects the gas-liquid separator of LNG-R32 heat exchanger exit, connects solenoid valve, the check-valves of gas-liquid separator gaseous phase outlet
And multiple-way valve, the refrigerant pump of gas-liquid separator liquid-phase outlet is connected, freezing-ultralow temperature parallel connection freezer system of refrigerant pump discharge is connected
System, the LNG-R32 heat exchanger obtain LNG cold energy for refrigerant, and the gas-liquid separator is used to guarantee into the cold of refrigerant pump
Matchmaker all exists with liquid form.
(4) high pressure of above-mentioned R32 cold accumulation system, including R32 low-temperature storage tank, connection R32 low-temperature storage tank liquid phase entrance is floating
Sub- valve and fluid level controller connect the check-valves and solenoid valve of R32 low-temperature storage tank gas phase entrance, connect R32 low-temperature storage tank liquid phase
The refrigerant pump of outlet connects freezing-ultralow temperature parallel connection refrigeration storage system of refrigerant pump discharge, and the fluid level controller can be real-time
The storage capacity of R32 in monitoring and regulation low-temperature storage tank, guarantee be no more than warning line while storage sufficient amount low temperature R32 with
It is used when opening charge cycle cooling supply.
(5) above-mentioned R32 vapor-compression refrigerant cycle system, the solenoid valve including connecting multi-pass valve outlet, connects electromagnetism
The compressor of valve outlet, the condenser of connect compressor outlet, connects the throttle valve and check-valves of condensator outlet, connects gas-liquid
The check-valves and solenoid valve of separator gaseous phase outlet connect the refrigeration storage system of gas-liquid separator liquid-phase outlet, the gas-liquid separation
Device is used to guarantee that the refrigerant into refrigeration storage system all to exist with liquid form.
(6) above-mentioned refrigerated merchandiser systems, solenoid valve and temperature controller including connecting threeway valve outlet, connect solenoid valve
The heating power expansion valve of outlet connects the freezer of thermal expansion valve outlet, the solenoid valve and multiple-way valve of the outlet of connection freezer, institute
It states solenoid valve and temperature sensor and stablizes for adjusting temperature of ice house, the heating power expansion valve is for adjusting cold medium flux.
(7) the above-mentioned ammonia cycle refrigeration system using LNG cold energy, the LNG- ammonia heat exchange including connecting threeway valve outlet
Device connects LNG-ammonia heat exchanger exit gas-liquid separator, connects the solenoid valve and check-valves of gas-liquid separator gaseous phase outlet,
The refrigerant pump of gas-liquid separator liquid-phase outlet is connected, the refrigerated merchandiser systems of refrigerant pump discharge are connected, the gas-liquid separator is used for
Guarantee that the refrigerant for entering refrigerant pump all exists with liquid form.
(8) above-mentioned ice-storage system, including cold accumulating device by ice are connected to the solenoid valve at cold accumulating device by ice both ends.
(9) above-mentioned ammonia vapor-compression refrigerant cycle system, the solenoid valve including connecting multi-pass valve outlet, connects solenoid valve
The compressor of outlet, the condenser of connect compressor outlet connect the throttle valve and check-valves of condensator outlet, connection gas-liquid point
Check-valves and solenoid valve from device gaseous phase outlet connect the refrigeration storage system of gas-liquid separator liquid-phase outlet, the gas-liquid separator
For guaranteeing that the refrigerant into refrigeration storage system all exists with liquid form.
The beneficial effects of the present invention are:
The present invention realizes the cascade utilization to LNG cold energy, improves the utilization rate to LNG cold energy；According to optimization from
Autocontrol system can adjust the flow of refrigerant in real time not only to achieve the purpose that control temperature of ice house, additionally it is possible to realize a variety of
It is run while cooling supply mode, solves the stability problem of the freezer operation using LNG refrigeration；On the peak of natural gas supply
When phase or low electricity price, the cold accumulation system that can design through the invention carries out cold-storage, in the low peak period or height of natural gas supply
The cold energy of storage is released again when electricity price, reduces the operating cost of system, while having ensured LNG stream amount is few or has a power failure etc.
Freezer being capable of continuous running under extreme case；The refrigerant R32 and liquefied ammonia of selection have very high friendly to environment；Using cold
Matchmaker has freezing by change of state, can make full use of refrigerant gasification latent heat refrigeration, reduces cold medium flux；
The present invention is greatly reduced compared to the cooling flow of general freezer using compressed vapour refrigeration cycle mode freezer
Power consumption, economic value with higher, while automation control system is capable of the working condition of Real-time Feedback freezer,
Guarantee freezer continuous running in a manner of effective.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is a kind of structural representation of the high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy of the invention
Figure；
Fig. 2 is freezing of the invention-ultralow temperature parallel connection refrigeration storage system ideally refrigerant pressure-enthalpy chart；
In figure, 1,6,20,21,28,30,63,71,78,82 be triple valve, 2,4,7,10,15,17,19,25,27,29,
31、36、37、41、45、48、49、50、52、55、56、58、64、66、68、70、72、76、79、81、83、85、86、87、88、90
For solenoid valve, 3,11,33,43,74 be heating power expansion valve, 5 is LNG-R32 heat exchanger, 12 is LNG- ammonia heat exchanger, 8,46,47,
77 be multiple-way valve, and 9 be LNG gasification device, and 13,42,51,53,54,57,62,80,89,94 be check-valves, 14,18,40,65,69
It is refrigerant pump for gas-liquid separator, 16,26,67,22 be high pressure float valve, and 23 be fluid level controller, and 24 be R32 low-temperature storage tank,
32,38,73 be temperature controller, and 34 be freezer, and 35 be pressure-regulating valve, and 44 be ultralow cold storage, and 59,91 be compressor, 60,
92 be condenser, and 39,61,93 be throttle valve, and 75 be freezer, and 84 be cold accumulating device by ice.
Specific embodiment
A specific embodiment of the invention is introduced with reference to the accompanying drawing.
Referring to shown in Fig. 1, the present invention is a kind of high-adaptability multi-stage temperature refrigerator system of energy cascade utilization LNG cold energy, it is wrapped
LNG gasification system is included, freezing-ultralow temperature parallel connection refrigeration storage system utilizes the R32 cycle refrigeration system of LNG cold energy, R32 cold-storage system
System, R32 vapor-compression refrigerant cycle system, refrigerated merchandiser systems, using the ammonia cycle refrigeration system of LNG cold energy, ice-storage system,
Ammonia vapor-compression refrigerant cycle system.
(1) above-mentioned LNG gasification system, including triple valve 1 export the solenoid valve 4 being connected with 1 one end of triple valve, with three
The connected solenoid valve 2 in 1 other end of port valve outlet, exports the heating power expansion valve 3 being connected with solenoid valve 2, exports with heating power expansion valve 3
Connected LNG-R32 heat exchanger 5, the triple valve 6 being connected with 5 outlet end of LNG-R32 heat exchanger export phase with 6 one end of triple valve
Solenoid valve 7 even, exports the solenoid valve 10 being connected with 6 other end of triple valve, exports the heating power expansion valve being connected with solenoid valve 10
11, the LNG- ammonia heat exchanger 12 being connected is exported with heating power expansion valve 11, exports the check-valves 13 being connected with LNG- ammonia heat exchanger 12,
And the multiple-way valve 8 being connected is exported with solenoid valve 4, solenoid valve 7, check-valves 13, the LNG vaporization device being connected is exported with multiple-way valve 8.
The solenoid valve 4 is used to control the on-off of LNG direct gasification pipeline, and the solenoid valve 2 is for controlling LNG mono-
The on-off of grade heat exchanging pipe, heat exchange of the LNG-R32 heat exchanger 5 for realizing LNG pipeline and R32 pipeline, the heat
Power expansion valve 3 is used to control LNG stream amount and then regulate and control the size of LNG pipeline and R32 pipeline heat exchange amount, and the solenoid valve 7 is used
The on-off of direct gasification pipeline after control LNG level-one heat exchange, the solenoid valve 10 is for controlling LNG secondary heat exchange pipeline
On-off, heat exchange of the LNG-ammonia heat exchanger 12 for realizing LNG pipeline and ammonia pipeline, the use of heating power expansion valve 11
In control LNG stream amount and then the size of regulation LNG pipeline and ammonia pipeline heat exchange amount, the check-valves 13 is for preventing refrigerant from returning
Stream, the LNG vaporization device 9 supply user's use for LNG to be gasified totally.
(2) above-mentioned freezing-ultralow temperature parallel connection refrigeration storage system, including triple valve 30, the outlet of connection 30 one end of triple valve
Solenoid valve 31 and temperature controller 32, the heating power expansion valve 33 that connection solenoid valve 31 exports, connection heating power expansion valve 33 export
Freezer 34, the pressure-regulating valve 35 that connection freezer 34 exports, the solenoid valve 36 that connection pressure-regulating valve 35 exports, connection three
The solenoid valve 37 and temperature controller 38 of 30 other end of port valve outlet, the throttle valve 39 that connection solenoid valve 37 exports, connection throttling
The gas-liquid separator 40 that valve 39 exports, connects the solenoid valve 41 of 40 gaseous phase outlet of gas-liquid separator, and connection solenoid valve 41 exports
Check-valves 42 connects the heating power expansion valve 43 of 40 liquid-phase outlet of gas-liquid separator, the ultralow temperature that connection heating power expansion valve 43 exports
Library 44, the solenoid valve 45 that connection ultralow cold storage 44 exports, and connection solenoid valve 36, check-valves 42, solenoid valve 45 export more
Port valve 46.
The triple valve 30 enters freezing-ultralow temperature parallel connection for realizing 32 refrigerant of low temperature that a variety of refrigeration modes obtain
Refrigeration storage system, the solenoid valve 31 and temperature sensor 32 are for maintaining freezer temperature to stablize, the heating power expansion valve
33 for adjusting cold medium flux, and the freezer 34 is used for for realizing LNG cold energy use, the pressure-regulating valve 35 to cold
For matchmaker's decompression to mix with ultralow cold storage outlet low pressure refrigerant, the solenoid valve 36 is used to control the logical of Freezing room refrigeration pipeline
Disconnected, the solenoid valve 37 and temperature sensor 38 is for maintaining ultralow cold storage temperature to stablize, and the throttle valve 39 is for giving
For refrigerant decrease temperature and pressure to reach ultralow cold storage cryogenic temperature requirement, the gas-liquid separator 40 enters ultralow cold storage for guaranteeing
The refrigerant of 44 evaporators all exists with liquid form, and the solenoid valve 41 is used to control the on-off of gas phase refrigerant pipeline, institute
The check-valves 42 stated is for preventing refrigerant return, and the heating power expansion valve 43 is for adjusting cold medium flux, the ultralow temperature
Library 44 is used to control the on-off of ultralow cold storage refrigeration pipeline for realizing the utilization to LNG cold energy, the solenoid valve 45.
(3) the above-mentioned R32 cycle refrigeration system using LNG cold energy, the solenoid valve 48 including the outlet of connection multiple-way valve 47,
LNG-R32 heat exchanger that solenoid valve 48 exports is connected, the gas-liquid separator 14 of LNG-R32 heat exchanger exit is connected, connects gas-liquid
The solenoid valve 50 of 14 gaseous phase outlet of separator, the check-valves 51 that connection solenoid valve 50 exports, connection 14 liquid phase of gas-liquid separator go out
The solenoid valve 15 of mouth, the refrigerant pump 16 that connection solenoid valve 15 exports, the solenoid valve 17 that connection refrigerant pump 16 exports, connection solenoid valve
The triple valve 20,21 of 17 outlets, the R32 cold accumulation system of connection 21 one end of triple valve outlet, the outlet of connection 21 other end of triple valve
Solenoid valve 29, connection solenoid valve 29 export freezing-ultralow temperature parallel connection refrigeration storage system.
The multiple-way valve 47 is used to control the flow into the vapor phase ammonia of ammonia vapor compression refrigeration system, the electromagnetism
Valve 48,49 is used to control the on-off of R32 Yu LNG heat exchanging pipe, and the LNG-R32 heat exchanger 5 is cold for refrigerant acquisition LNG
Can, the gas-liquid separator 14 is used to guarantee that the refrigerant into refrigerant pump all to exist with liquid form, the solenoid valve
50 for controlling the on-off of gas phase refrigerant pipeline, and the check-valves 51 for preventing refrigerant return, use by the refrigerant pump 16
In providing power for entire circulation, the solenoid valve 15,17 is used to control the opening and closing of refrigerant pump 16, and the triple valve 20 is used
Converge in LNG cold energy refrigeration modes and low temperature refrigerant made from vapour compression refrigeration mode, the triple valve 21 is for adjusting
Into R32 cold accumulation system and freezing-ultralow temperature parallel connection refrigeration storage system low temperature refrigerant flow.
(4) above-mentioned R32 cold accumulation system, including R32 low-temperature storage tank 24 connect the height of 24 liquid phase entrance of R32 low-temperature storage tank
Float-controlled valve 22 and fluid level controller 23 are pressed, the triple valve 21 of 22 entrance of high pressure float valve is connected, connects 24 gas phase of R32 low-temperature storage tank
The check-valves 54 of entrance, the solenoid valve 55 that connection check-valves 54 exports, connects the solenoid valve of 24 liquid-phase outlet of R32 low-temperature storage tank
25, the refrigerant pump 26 that connection solenoid valve 25 exports, the solenoid valve 27 that connection refrigerant pump 26 exports connects solenoid valve 27 exports three
Port valve 28, freezing-ultralow temperature parallel connection refrigeration storage system that connection triple valve 28 exports, connection 24 gaseous phase outlet of R32 low-temperature storage tank
Solenoid valve 56, the check-valves 57 that connection solenoid valve 56 exports.
The R32 low-temperature storage tank is used to store the R32 refrigerant that a part has been cooled to low temperature, the triple valve 21
For adjusting the cold medium flux for entering R32 cold accumulation system, the high pressure float valve 22 is for controlling R32 cold accumulation system pipeline
On-off, the fluid level controller 23 are used to monitor in real time and adjust the storage capacity of R32 in low-temperature storage tank, guarantee to be no more than warning
The low temperature R32 of sufficient amount is stored while line to use when opening charge cycle cooling supply, the check-valves 54 is used for
Refrigerant return is prevented, the solenoid valve 55 is used to control the on-off that gas phase R32 refrigerant returns to R32 cold accumulation system pipeline, described
Refrigerant pump 26 provide power when being used for as R32 cold accumulation system to refrigeration storage system cooling supply, the solenoid valve 25,27 is used to control
The opening and closing of refrigerant pump 26, the solenoid valve 56 are described for controlling the on-off that gas phase R32 enters refrigerant cooling system pipeline
Check-valves 27 is for preventing R32 refrigerant return.
(5) above-mentioned R32 vapor-compression refrigerant cycle system, including the solenoid valve 58 that connection multiple-way valve 47 exports, even
Connect the compressor 59 of the outlet of solenoid valve 58, the condenser 60 that connect compressor 59 exports, the throttle valve that connection condenser 60 exports
61, the check-valves 62 that connection throttle valve 61 exports, the gas-liquid separator 18 that connection check-valves 62 exports connects gas-liquid separator 18
The solenoid valve 52 of gaseous phase outlet, the check-valves 53 that connection solenoid valve 52 exports, connects the electromagnetism of 18 liquid-phase outlet of gas-liquid separator
Valve 19, the triple valve 20,21 that connection solenoid valve 19 exports, the R32 cold accumulation system of connection 21 one end of triple valve outlet connect threeway
The solenoid valve 29 of 21 other end of valve outlet, freezing-ultralow temperature parallel connection refrigeration storage system that connection solenoid valve 29 exports.
The multiple-way valve 47 is used to control the flow into the gas phase R32 of R32 vapor compression refrigeration system, the electricity
Magnet valve 58,19 is used to control the on-off of R32 vapor-compression refrigerant cycle pipeline, the compressor 59, condenser 60, throttle valve
61 for realizing R32 refrigerant vapour compression refrigeration, the check-valves 62 is for preventing low pressure R32 refrigerant return, the gas
Liquid/gas separator 18 is used to guarantee that the refrigerant into refrigeration storage system all to exist with liquid form, and the solenoid valve 52 is for controlling
The on-off of gas phase refrigerant pipeline, the check-valves 53 is for preventing refrigerant return.
(6) above-mentioned refrigerated merchandiser systems, including solenoid valve 72 and temperature controller 73 that connection triple valve 71 exports, connection
The heating power expansion valve 74 that solenoid valve 72 exports, the freezer 75 that connection heating power expansion valve 74 exports, connection freezer 75 export
Solenoid valve 76, the multiple-way valve 77 that connection solenoid valve 76 exports.
The triple valve 71 enters refrigerated merchandiser systems for realizing 32 refrigerant of low temperature that a variety of refrigeration modes obtain, described
Solenoid valve 72 and temperature sensor 73 for maintaining cold store temperature to stablize, the heating power expansion valve 74 is for adjusting refrigerant
Flow, for realizing LNG cold energy use, the solenoid valve 76 is used to control the logical of freezer pipeline for the refrigeration Kuku 75
It is disconnected, the multiple-way valve 77 for realizing multiply gas phase R32 refrigerant confluence.
(7) the above-mentioned ammonia cycle refrigeration system using LNG cold energy, the solenoid valve 79 exported including connection triple valve 78,
Connect the triple valve 83 that solenoid valve 79 exports, the solenoid valve 86 that connection triple valve 82 exports, the LNG- that connection solenoid valve 86 exports
Ammonia heat exchanger 12, the solenoid valve 87 that connection LNG-liquefied ammonia heat exchanger 12 exports, the triple valve 63 that connection solenoid valve 87 exports, even
The solenoid valve 64 of the outlet of triple valve 63 is connect, the gas-liquid separator 65 that connection solenoid valve 64 exports connects 65 gas phase of gas-liquid separator
The solenoid valve 81 of outlet, the check-valves 80 that connection solenoid valve 81 exports, connects the solenoid valve 66 of 65 liquid-phase outlet of gas-liquid separator,
Connect the refrigerant pump 67 that solenoid valve 66 exports, the solenoid valve 68 that connection refrigerant pump 67 exports, the threeway that connection solenoid valve 68 exports
Valve 71,72, the refrigerated merchandiser systems that connection triple valve 72 exports.
The triple valve 77 is used to control the flow into the vapor phase ammonia of ammonia vapor compression refrigeration system, the LNG-
Ammonia heat exchanger 12 obtains LNG cold energy for liquefied ammonia refrigerant and LNG heat exchange, the triple valve 63,82 and solenoid valve 79,86,
87,64 between the cold accumulation system using LNG cold energy and the supplying cold directly system using LNG cold energy for switching over, described
Gas-liquid separator 65 be used to guarantee that the refrigerant into refrigerant pump all to exist with liquid form, the solenoid valve 81 is used to control
The on-off of gas phase refrigerant pipeline processed, the check-valves 80 is for preventing refrigerant return, and the refrigerant pump 67 is for being entire
Circulation provides power, and the solenoid valve 66,68 is used to control the opening and closing of refrigerant pump 67, and the triple valve 71 is cold for LNG
Low temperature refrigerant made from energy refrigeration modes and vapour compression refrigeration mode, which is converged, eventually enters into refrigerated merchandiser systems cooling supply.
(8) above-mentioned ice-storage system, including cold accumulating device by ice 84, be connected to cold accumulating device by ice both ends solenoid valve 83,
85。
The cold accumulating device by ice 84 is used to store the cold energy of a part of LNG, the electromagnetism when LNG supply is larger
Valve 83,85 is used to control the on-off of cold accumulating device by ice pipeline.
(9) above-mentioned ammonia vapor-compression refrigerant cycle system, including the solenoid valve 88 that connection triple valve 78 exports, connection
The compressor 91 that solenoid valve 88 exports, the condenser 92 that connect compressor 91 exports, the throttle valve 93 that connection condenser 92 exports,
The check-valves 94 that throttle valve 93 exports is connected, the gas-liquid separator 69 that connection check-valves 94 exports connects 69 gas of gas-liquid separator
The mutually solenoid valve 90 of outlet, the check-valves 89 that connection solenoid valve 90 exports, connects the solenoid valve of 69 liquid-phase outlet of gas-liquid separator
70, the triple valve 71 that connection solenoid valve 70 exports, the refrigeration Kuku system that connection triple valve 71 exports.
The triple valve 77 is used to control the flow into the vapor phase ammonia of ammonia vapor compression refrigeration system, the electromagnetism
Valve 88,70 is used to control the on-off of ammonia vapor-compression refrigerant cycle pipeline, the compressor 91, condenser 92, throttle valve 93
For realizing the vapour compression refrigeration of ammonia refrigerant, the check-valves 94 is for preventing low-pressure ammonia refrigerant return, the electromagnetism
Valve 90 is used to control the on-off of gas phase refrigerant pipeline, and the check-valves 89 is for preventing refrigerant return, the gas-liquid separator
69 for guaranteeing that the refrigerant into refrigeration storage system all exists with liquid form, and the triple valve 71 is used for vapour compression refrigeration
Low temperature refrigerant made from mode and LNG cold energy refrigeration modes, which is converged, eventually enters into refrigerated merchandiser systems cooling supply.
Each process in the invention can be floating by the solenoid valve after preferably, heating power expansion valve, pressure-regulating valve, high pressure
Sub- valve adjusts the variation of flow, and temperature controller is for adjusting temperature of ice house timing constant, and fluid level controller is for guaranteeing liquid
The position moment is in rational position, to achieve the purpose that automation control.
Referring to shown in Fig. 2, freezing of the present invention-ultralow temperature parallel connection refrigeration storage system ideally refrigerant pressure-enthalpy chart, the pressure enthalpy
Figure is made of eight state points of A, B, C, D, E, F, G, H, and the A point is state point when R32 refrigerant is flowed out from multiple-way valve 47,
The B point is state point of the R32 refrigerant after the pressurization of compressor 59, and the C point is R32 refrigerant after the cooling of condenser 60
State point, the D point be R32 refrigerant state point after 61 decrease temperature and pressure of throttle valve, the H point be R32 refrigerant pass through
State point after LNG-R32 heat exchanger 5 cools down, the G point effect make simultaneously for expression R32 and LNG heat exchange Shi Youyi constant pressure drop
Process is more readily understood, and the E point is state point behind the chilled library 34 of R32 refrigerant, and the A point is R32 refrigerant through pressure tune
State point after section valve 35, the F point are R32 refrigerant state point after throttle valve 39, and the A point is R32 refrigerant through ultralow cold storage
State point afterwards, Fig. 2 provide theoretical basis for the realization of system.
LNG cold energy gradient utilization system specific working mode of the invention is described below:
The LNG pressure come out from storage tank or tank car about in 0.6MPa, -160 DEG C, does not pass through 4 direct gasification of solenoid valve
Part LNG can exchange heat in LNG-R32 heat exchanger and LNG-liquefied ammonia heat exchanger, and the heat-exchange temperature of the former refrigerant is-
25-- 20 DEG C, the heat-exchange temperature of the latter's refrigerant is 0-5 DEG C, using supplying user after air-heating type gasifier 9 and air heat-exchange.
Opens solenoid valve 22 can open R32 charge cycle, and the R32 after exchanging heat with liquefied natural gas is made to flow into R32
It is stored in low-temperature storage tank 24, gives over to additional refrigerant, the low temperature R32 refrigerant of storage can supply in high electricity price period on daytime or LNG
It answers and is used during deficiency, specific embodiment is opens solenoid valve 25,27, and the R32 in storage tank pressurizes laggard by refrigerant pump 26
Enter triple valve 28,30 and starts freezer refrigerating circulation.The source of cold-storage can be divided into two kinds, the first be when LNG supply amount is more,
Can be with opens solenoid valve 49, the R32 being cooled after exchanging heat with LNG is stored, and second is opened in night low electricity price
It opens solenoid valve 19 and carries out that voltage contraction is cold stores the R32 of low temperature, when two conditions are all satisfied, open above-mentioned two electromagnetism
Valve can carry out cold-storage work simultaneously.
R32 temperature in LNG-R32 heat exchanger after heat exchange is at-30-- 25 DEG C, into knockout drum 14
Gas phase and liquid phase R32 are separated, the R32 of gas phase enters multiple-way valve 46 and multiply gas phase after solenoid valve 50 and check-valves 51
The R32 of refrigerant R32 confluence, liquid phase enters triple valve 20 after the pressurization of refrigerant pump 16 from liquid phase output, one can enter storage
Cold-storage is carried out in tank 24, another stock can enter in freezer refrigerating circulation by solenoid valve 29, cold in freezer refrigeration cycle
Matchmaker R32 first passes through solenoid valve 31, using heating power expansion valve 33 adjust flow after enter freezer 34 evaporator in carry out gas
Change endothermic process, wherein the degree of superheat of heating power expansion valve is controlled according to the outlet temperature of freezer output end refrigerant, out
The refrigerant of evaporator successively by pressure-control valve 35 carry out pressure adjust with after solenoid valve 36 into multiple-way valve 46 in more
The refrigerant R32 confluence of stock gas phase, completes subsequent cooling liquid process；In the freezer refrigerating circulation of ultralow temperature, it is split
Another strand of refrigerant first passes through solenoid valve 37 and cools down using throttle valve 39, and temperature is-50-- 40 DEG C at this time, subsequently into
Gas phase is separated with the refrigerant of liquid phase in gas-liquid separator 40, the gas phase refrigerant isolated passes through solenoid valve 41 and check-valves
The refrigerant R32 for entering multiple-way valve 46 and multiply gas phase after 42 converges, and the liquid phase refrigerant isolated is adjusted by heating power expansion valve 43
Enter in the evaporator of ultralow cold storage 44 after flow and carry out gasification endothermic process, has gone out the refrigerant of evaporator after solenoid valve 42
Converge into multiple-way valve 46 in the refrigerant R32 of multiply gas phase, completes subsequent cooling liquid process.
Ammonia in LNG-ammonia heat exchanger after heat exchange passes through the shunting function of triple valve 63 after solenoid valve 87,
On the one hand it can enter solenoid valve 85 and the subsequent cold accumulating device by ice for possessing internal motivation carries out cold-storage work, on the other hand may be used
To be separated liquid phase with the ammonia of gas phase by entering in gas-liquid separator 65 after solenoid valve 64, the ammonia of gas phase passes through solenoid valve
81 and check-valves it is after 80s enter multiple-way valve 77 in converge, the ammonia of liquid phase then passes through the pressurization of solenoid valve 66 and refrigerant pump 67
Afterwards, into gasification heat absorption is carried out in freezer evaporator, the refrigerant of gasification passes through solenoid valve 76 first, and then refrigerant enters multi-pass
Valve 77 converges, and the gas phase refrigerant of confluence, which enters together in LNG-ammonia heat exchanger, carries out cooling liquid, completes circulation.Work as liquid
When changing deliverability of gas deficiency, it can be first shut off solenoid valve 86, make the vapor phase ammonia after freezer, successively by electricity
Magnet valve 79, solenoid valve 83, supply freezer refrigeration completes circulation after liquefying into the heat exchange of ice storage unit 84.
When the cold energy of the cold energy demand of freezer larger LNG supply is inadequate, can by open cold accumulation system and
Vapor-compression refrigerant cycle system meets refrigeration demand, can also be according to system carrying out practically situation by controlling different cooling supply
Opening and closing to carry out any collocation of a variety of cooling supply modes for mode, changes load and LNG supply to improve system with this
Adaptability, while alleviating the cold high electric load of voltage contraction, operational efficiency is improved, considerable economic benefit is brought.
Claims (8)
1. a kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy, it is characterized in that comprising LNG gasification system,
Freezing-ultralow temperature parallel connection refrigeration storage system, utilizes the R32 cycle refrigeration system of LNG cold energy, R32 cold accumulation system, R32 both vapor compression
Cooling cycle system, refrigerated merchandiser systems utilize the ammonia cycle refrigeration system of LNG cold energy, ice-storage system, ammonia vapour compression refrigeration
The circulatory system.
The LNG gasification system, including LNG-R32 heat exchanger, LNG-ammonia heat exchanger, heating power expansion valve, solenoid valve, non-return
Valve, natural gas transportation pipe network, what the liquefied natural gas-R32 heat exchanger refrigerant output and input piping connection is to utilize
The R32 cycle refrigeration system of LNG cold energy, what the LNG-liquefied ammonia heat exchanger refrigerant output and input piping connection is to utilize
The liquefied ammonia cycle refrigeration system of LNG cold energy, the heating power expansion valve can be adjusted according to the heat-exchange temperature of setting into heat exchange
The LNG stream amount of device, the solenoid valve can adjust LNG heat exchange mode according to freezer operating mode, and the check-valves can be with
Prevent low pressure pipeline refrigerant return.
The freezing-ultralow temperature parallel connection refrigeration storage system, solenoid valve and temperature controller including connecting threeway valve outlet, connection
The heating power expansion valve of freezer branch electromagnetic valve outlet connects the freezer of thermal expansion valve outlet, the outlet of connection freezer
Pressure-regulating valve, the multiple-way valve of connection pressure-regulating valve outlet, connects the solenoid valve and temperature of ultralow cold storage branch electromagnetic valve outlet
Controller is spent, the throttle valve of electromagnetic valve outlet is connected, the gas-liquid separator of connection throttling valve outlet connects gas-liquid separator gas phase
Solenoid valve, check-valves and the multiple-way valve of outlet connect the heating power expansion valve of gas-liquid separator liquid-phase outlet, connect heating power expansion valve
The ultralow cold storage of outlet, the check-valves of connection ultralow cold storage outlet, connects the multiple-way valve of non-return valve outlet, the gas-liquid separator
For guaranteeing that the refrigerant into evaporator all exists with liquid form, the solenoid valve and temperature sensor are for adjusting freezer
Temperature is stablized, and the heating power expansion valve is used to cool down to refrigerant for adjusting cold medium flux, the throttle valve, and the pressure is adjusted
Valve is used to be depressured to refrigerant.
The R32 cycle refrigeration system using LNG cold energy, LNG-R32 heat exchanger including connecting multi-pass valve outlet, even
The gas-liquid separator of LNG-R32 heat exchanger exit is connect, solenoid valve, check-valves and the multi-pass of gas-liquid separator gaseous phase outlet are connected
Valve connects the refrigerant pump of gas-liquid separator liquid-phase outlet, connects freezing-ultralow temperature parallel connection refrigeration storage system of refrigerant pump discharge, institute
It states LNG-R32 heat exchanger and obtains LNG cold energy for refrigerant, the gas-liquid separator is used to guarantee the refrigerant whole into refrigerant pump
Exist with liquid form.
The R32 cold accumulation system, including R32 low-temperature storage tank connect the high pressure float valve and liquid of R32 low-temperature storage tank liquid phase entrance
Level controller connects the check-valves and solenoid valve of R32 low-temperature storage tank gas phase entrance, connects the cold of R32 low-temperature storage tank liquid-phase outlet
Matchmaker's pump, connects freezing-ultralow temperature parallel connection refrigeration storage system of refrigerant pump discharge, connects the solenoid valve of R32 low-temperature storage tank gaseous phase outlet
And check-valves, the fluid level controller can monitor and adjust the storage capacity of R32 in low-temperature storage tank in real time, guarantee to be no more than police
The low temperature R32 of storage sufficient amount when opening charge cycle cooling supply while guarding against line to use.
The R32 vapor-compression refrigerant cycle system, the solenoid valve including connecting multiple-way valve, connects the compression of electromagnetic valve outlet
Machine, the condenser of connect compressor outlet connect the throttle valve and check-valves of condensator outlet, and connection gas-liquid separator gas phase goes out
Mouthful check-valves and solenoid valve, connect gas-liquid separator liquid-phase outlet refrigeration storage system, the gas-liquid separator for guarantee into
The refrigerant for entering refrigeration storage system all exists with liquid form.
The refrigerated merchandiser systems, solenoid valve and temperature controller including connecting threeway valve outlet, connect electromagnetic valve outlet
Heating power expansion valve connects the freezer of thermal expansion valve outlet, the solenoid valve and multiple-way valve of the outlet of connection freezer, the electromagnetism
Valve and temperature sensor are stablized for adjusting temperature of ice house, and the heating power expansion valve is for adjusting cold medium flux.
The ammonia cycle refrigeration system using LNG cold energy, the LNG- ammonia heat exchanger including connecting threeway valve outlet, connection
LNG-ammonia heat exchanger exit gas-liquid separator connects the check-valves of the solenoid valve of gas-liquid separator gaseous phase outlet, connects gas-liquid
The refrigerant pump of separator liquid-phase outlet, connects the refrigerated merchandiser systems of refrigerant pump discharge, and the gas-liquid separator enters for guaranteeing
The refrigerant of refrigerant pump all exists with liquid form.
The ice-storage system, including cold accumulating device by ice are connected to the solenoid valve at cold accumulating device by ice both ends.
The ammonia vapor-compression refrigerant cycle system, the solenoid valve including connecting multiple-way valve, connects the compression of electromagnetic valve outlet
Machine, the condenser of connect compressor outlet connect the throttle valve and check-valves of condensator outlet, and connection gas-liquid separator gas phase goes out
Mouthful check-valves and solenoid valve, connect gas-liquid separator liquid-phase outlet refrigeration storage system, the gas-liquid separator for guarantee into
The refrigerant for entering refrigeration storage system all exists with liquid form.
2. a kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy according to claim 1, feature
It is to realize the cascade utilization to LNG cold energy by multi-stage temperature refrigerator.
3. a kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy according to claim 1, feature
It is to greatly improve system by addition R32 low-temperature storage tank and cold accumulating device by ice and fit load variations and LNG supply variation
Ying Xing.
4. a kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy according to claim 1, feature
It is to be freezed three kinds according to freezer practical operation situation to using LNG cold energy refrigeration, vapour compression refrigeration, cold-storage device
Refrigeration modes carry out any collocation, meet refrigeration demand with minimum economic cost.
5. a kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy according to claim 1, feature
It is to be added to gas-liquid separator before entering refrigerant pump or freezer evaporator, ensure that the normal operation and evaporation of refrigerant pump
The higher heat exchange efficiency of device.,
6. a kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy according to claim 1, feature
It is that the refrigerant selected is R32 and ammonia, there is very high friendly to environment.
7. a kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy according to claim 1, feature
It is there is freezing by change of state circulation using R32 and ammonia, reduces the flow of refrigerant.
8. a kind of high-adaptability cold-storage multi-stage temperature refrigerator system of cascade utilization LNG cold energy, feature exist according to claim 1
In the variation of flow can be adjusted by solenoid valve after preferably, heating power expansion valve, pressure-regulating valve, high pressure float valve, temperature
Degree controller is used to adjust temperature of ice house timing constant, and fluid level controller is used to guarantee that the liquid level moment is in rational position, thus
Achieve the purpose that automation control.
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