CN115479421A - Operating system for storing, recovering and supplying cold energy - Google Patents
Operating system for storing, recovering and supplying cold energy Download PDFInfo
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- CN115479421A CN115479421A CN202110672323.5A CN202110672323A CN115479421A CN 115479421 A CN115479421 A CN 115479421A CN 202110672323 A CN202110672323 A CN 202110672323A CN 115479421 A CN115479421 A CN 115479421A
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/005—Devices using other cold materials; Devices using cold-storage bodies combined with heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2303/00—Details of devices using other cold materials; Details of devices using cold-storage bodies
- F25D2303/08—Devices using cold storage material, i.e. ice or other freezable liquid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention provides a cold energy storage, recovery and supply running system which comprises a low-temperature storage tank, a cooler, a cold accumulator, cold energy utilization equipment and a cold carrying pump, wherein a low-temperature medium is contained in the low-temperature storage tank. The cold energy storage, recovery and supply operation system can exchange heat with a low-temperature medium through the secondary refrigerant of the cooler to cool so as to obtain cold energy, the secondary refrigerant with the cold energy enters the cold accumulator to exchange heat with a cold storage agent so as to store the cold energy in the cold accumulator, the interval of solid sensible heat, solid-liquid phase change latent heat and liquid sensible heat of the cold storage agent is utilized in a superposition manner, the cold storage efficiency is improved, meanwhile, the secondary refrigerant can transmit the cold energy to the cold energy utilization equipment in a balanced and continuous manner, and the cold energy utilization equipment is enabled to utilize the cold energy. The refrigerating medium circulates in the whole operation system, so that the synchronous recovery, storage and supply of the cold energy of the low-temperature medium can be realized, the cold energy of the low-temperature medium can be effectively recycled, and the recycling efficiency of the cold energy can be improved.
Description
Technical Field
The invention relates to the technical field of cold energy utilization, in particular to a cold energy storage, recovery and supply operation system which is used for realizing synchronous operation of cold energy recovery, storage and supply.
Background
LNG is a low-temperature (-162 ℃) liquid mixture which is liquefied by a low-temperature process after gaseous natural gas is subjected to desulfurization, dehydration and decarbonation. LNG must be vaporized and heated to above 0 c for import into the pipeline network before being supplied to downstream customers for use. A large amount of cold energy is released during LNG gasification, and the cold energy released by each ton of LNG gasification is about 220 kW.h. The cold energy is recycled and utilized through a specific process technology, so that the aims of saving energy, protecting environment and expanding an LNG industrial chain can be fulfilled.
In addition, the industrial gas such as oxygen-nitrogen-argon stored in a liquid state is used like LNG, and is also required to be heated and vaporized, and this part of the cold energy is not utilized. The LNG, liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen, liquid helium, liquid ethane, liquid ethylene, and the like may be collectively referred to as cryogenic medium.
At present, LNG cold energy is applied to industries such as power generation, air separation, rubber crushing, dry ice manufacturing and refrigeration houses, most cold energy releasing processes have the characteristics of fluctuation and discontinuity, cold places such as air separation, rubber crushing, dry ice manufacturing and refrigeration houses and LNG vaporization places are often not located together, collected cold energy needs to be stored firstly, then stored cold energy needs to be transported and supplied, and cannot be continuously carried out, so that most cold energy cannot be effectively recycled, and the problem of low cold energy utilization efficiency is caused.
Disclosure of Invention
The invention aims to solve the problems that cold energy generated by a low-temperature medium needs to be stored firstly, and then the stored cold energy needs to be transported and supplied, cannot be continuously carried out, cannot be efficiently recycled, and causes low cold energy utilization efficiency in the prior art.
In order to solve the technical problems, the invention provides a running system for storing, recovering and supplying cold energy, which comprises a low-temperature storage tank, a cooler, a cold accumulator, cold energy utilization equipment and a cold-carrying pump, wherein a low-temperature medium is contained in the low-temperature storage tank; the cooler comprises a first channel for circulating the low-temperature medium and a second channel for circulating the refrigerating medium, and the first channel and the second channel are independent; the low-temperature storage tank is communicated with an inlet of the first channel through a pipeline, and the low-temperature medium enters the first channel and exchanges heat with the secondary refrigerant circulating in the second channel; the cold accumulator is internally provided with a cold storage agent for storing cold energy and comprises a high-temperature port and a low-temperature port; a low-temperature port of the cold accumulator is communicated with an outlet of the second channel through a pipeline, and the secondary refrigerant enters the cold accumulator and exchanges heat with the cold storage agent; the inlet of the cold energy utilization device is communicated with the high-temperature port of the cold accumulator through a pipeline; the outlet of the cold energy utilization equipment is communicated with the inlet of the second channel through a pipeline, so that the secondary refrigerant after heat exchange of the cold energy utilization equipment enters the cooler; and the cold carrying pump is arranged on a pipeline between the outlet of the cold energy utilization equipment and the inlet of the cooler.
Optionally, the operation system further includes a first control valve disposed on a pipeline between the cold-carrying pump and the inlet of the cooler, and a second control valve disposed on a pipeline between the low-temperature port of the cold accumulator and the inlet of the cold energy utilization device.
Optionally, the operating system further includes a first branch pipe, one end of the first branch pipe is communicated with the high-temperature port of the regenerator, and the other end of the first branch pipe is communicated with a pipeline between the low-temperature port of the regenerator and the inlet of the cold energy utilization device.
Optionally, the operation system further comprises a third control valve provided on the first branch pipe.
Optionally, the operation system further comprises a connection pipe, and the connection pipe is communicated with the cold carrying pump and the high temperature port of the cold accumulator.
Optionally, the operation system further comprises a seventh control valve, and the seventh control valve is arranged on the connecting pipe.
Optionally, the operating system further comprises a vaporizer, an inlet of the vaporizer being in communication with an outlet of the first passage via a conduit.
Optionally, the operation system further comprises a third branch pipe and a fifth control valve, one end of the third branch pipe communicates with a piping between the outlet of the cryogenic tank and the inlet of the first passage, and the other end of the third branch pipe communicates with a piping between the outlet of the first passage and the inlet of the vaporizer; the fifth control valve is provided on the third branch pipe.
Optionally, the operation system further comprises a mobile cold charging device, an outlet of the mobile cold charging device is communicated with the low-temperature port of the cold accumulator through a pipeline, and an inlet of the mobile cold charging device is communicated with the high-temperature port of the cold accumulator through a pipeline.
Optionally, a pipeline between the outlet of the mobile cold charging device and the low-temperature port of the regenerator comprises a first transition pipe and a first external pipe which are connected, a free end of the first transition pipe is communicated with the low-temperature port of the regenerator, a free end of the first external pipe is communicated with the outlet of the mobile cold charging device, and the first transition pipe is communicated with the first external pipe through a quick-attach joint; the pipeline between the inlet of the movable cold charging equipment and the high-temperature port of the cold accumulator comprises a second transition pipe and a second outer connecting pipe, the free end of the second transition pipe is communicated with the high-temperature port of the cold accumulator, the free end of the second outer connecting pipe is communicated with the inlet of the movable cold charging equipment, and the second transition pipe is communicated with the second outer connecting pipe through a quick connector.
According to the technical scheme, the beneficial effects of the invention are as follows:
in the operation system for storing, recovering and supplying cold energy, the secondary refrigerant with the cold energy can exchange heat with the low-temperature medium to reduce the temperature so as to obtain the cold energy, the secondary refrigerant with the cold energy enters the cold accumulator to exchange heat with the cold storage agent so as to store the cold energy in the cold accumulator, the solid sensible heat, the solid-liquid phase change latent heat and the liquid sensible heat of the cold storage agent are superposed and utilized, the cold storage efficiency is improved, and meanwhile, the secondary refrigerant can evenly and continuously transmit the cold energy to the cold energy utilization equipment so that the cold energy utilization equipment utilizes the cold energy. The refrigerating medium circulates in the whole operation system, so that the synchronous recovery, storage and supply of the cold energy of the low-temperature medium can be realized, the cold energy of the low-temperature medium can be effectively recycled, and the recycling efficiency of the cold energy can be improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a cold energy storage, recovery and supply operating system of the present invention.
The reference numerals are explained below: 100. operating the system; 10. a low temperature storage tank; 20. a cooler; 21. a first channel; 22. a second channel; 30. a regenerator; 40. a cold energy utilization device; 50. a cold carrying pump; 61. a sixth control valve; 62. a second control valve; 63. a ninth control valve; 64. a first control valve; 65. a tenth control valve; 66. an eleventh control valve; 71. a third branch pipe; 72. a fifth control valve; 73. a first branch pipe; 74. a third control valve; 75. a connecting pipe; 76. a seventh control valve; 81. a first temperature sensor; 82. a second temperature sensor; 83. a third temperature sensor; 91. a vaporizer; 92. moving the cold charging device; 93. moving the regenerator; 94. moving the cold carrying pump; 95. a first transition duct; 96. a first external connection pipe; 97. a second transition duct; 98. a second outer adapter tube; 99. a quick coupler.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a cold energy storage, recovery and supply operation system 100 (hereinafter, referred to as "operation system 100"), which can recover and store cold energy released during the gasification of a low-temperature medium, and can utilize the stored cold energy, thereby implementing the synchronous operation of storage and supply procedures, and effectively improving the utilization efficiency of cold energy.
The operation system 100 of the present embodiment includes a cryogenic tank 10, a cooler 20, a cold storage 30, a cold energy utilizing device 40, and a cold load pump 50.
Wherein the cryogenic tank 10 contains a cryogenic medium therein. The cooler 20 includes a first passage 21 for circulating a low-temperature medium and a second passage 22 for circulating a coolant, and the first passage 21 and the second passage 22 are independent of each other. The cryogenic tank 10 is connected by piping to the inlet of the first pass 21 and the cryogenic medium enters the first pass 21 and exchanges heat with the coolant in the second pass 22. The regenerator 30 contains a coolant for storing cold energy therein, and the regenerator 30 includes a high temperature port and a low temperature port. The low temperature port of the regenerator 30 is communicated with the outlet of the second channel 22 through a pipeline, and the coolant enters the regenerator 30 and exchanges heat with the coolant.
The inlet of the cold energy utilization device 40 is communicated with the high temperature port of the regenerator 30 through a pipe. The outlet of the cold energy utilization device 40 is connected to the inlet of the second channel 22 through a pipeline, so that the coolant after the heat exchange of the cold energy utilization device 40 enters the cooler 20. The cold load pump 50 is provided on a pipeline between the outlet of the cold energy utilizing apparatus 40 and the inlet of the cooler 20.
Further, the low-temperature medium in this embodiment is LNG, and LNG releases a large amount of cold energy during vaporization, and the cold energy released per ton of LNG vaporization is about 220kW · h. In addition to LNG, the cryogenic medium may be liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen, liquid helium, liquid ethane, liquid ethylene, or the like.
The cryogenic medium is accommodated in the cryogenic storage tank 10, and the cryogenic storage tank 10 may be a large LNG storage tank of an LNG receiving terminal, a small and medium LNG storage tank located in each satellite vaporization station, a liquid oxygen and liquid nitrogen storage tank of each industrial gas customer, or a refrigerated vehicle-mounted LNG steel cylinder powered by LNG, a ship LNG fuel storage tank, or the like. The cryogenic tank 10 is not limited to a large extent as long as it can accommodate cryogenic media.
In this embodiment, the cooler 20 is used for heat exchange between a low-temperature medium and a coolant, and the liquid low-temperature medium is vaporized to raise the temperature, so that the coolant absorbs the cold energy released by the low-temperature medium to cool.
The cooler 20 of the present embodiment includes a first passage 21 and a second passage 22 that are independent of each other. The first passage 21 is used for circulating a low-temperature medium, and the second passage 22 is used for circulating a coolant. The inlet of the first passage 21 is communicated with the low-temperature storage tank 10 through a pipeline, and the low-temperature medium enters the first passage 21 and exchanges heat with the refrigerating medium circulating in the second passage 22, so that the refrigerating medium absorbs cold energy to cool.
A sixth control valve 61 is arranged on a pipeline between the inlet of the first passage 21 and the cryogenic tank 10, and the sixth control valve 61 is used for controlling the on-off of the pipeline between the cryogenic tank 10 and the inlet of the first passage 21 in the cooler 20, so as to control the circulation of the cryogenic medium in the cooler 20.
In this embodiment, the operation system 100 further includes a vaporizer 91, and the vaporizer 91 is used to heat the cryogenic medium to meet the supply temperature. The vaporizer 91 may be a large LNG seawater heating vaporizer of an LNG receiving terminal, a medium-and-small LNG air-temperature vaporizer or a water-bath vaporizer of each satellite vaporizing station, liquid oxygen, liquid nitrogen air-temperature vaporizer or a water-bath vaporizer of each industrial gas customer, a vehicle-mounted LNG vaporizer, a ship LNG vaporizer, or the like.
The inlet of the vaporizer 91 communicates with the outlet of the first passage 21 in the cooler 20 through a pipe. The liquid low-temperature medium enters the vaporizer 91 and then is vaporized, and then enters a natural gas pipe network or a subsequent gas utilization device through a pipeline.
The operation system 100 of the present embodiment further includes a third branch pipe 71 and a fifth control valve 72. One end of third branch pipe 71 communicates with a pipe between the outlet of cryogenic tank 10 and the inlet of first passage 21, and the other end communicates with a pipe between the outlet of first passage 21 and the inlet of vaporizer 91. Wherein the connection of the third branch pipe 71 to the piping between the outlet of the cryogenic tank 10 and the inlet of the first channel 21 is located upstream of the sixth control valve 61.
A fifth control valve 72 is provided in the third branch pipe 71 for controlling on/off of the third branch pipe 71. When the cold energy storage and supply of the low-temperature medium meet the requirements, the sixth control valve 61 can be closed, and the fifth control valve 72 can be opened, so that the low-temperature medium in the low-temperature storage tank 10 directly enters the vaporizer 91 for vaporization treatment, and then enters a natural gas pipeline network or a subsequent gas-using device through a pipeline.
When cold storage and cold energy supply are required, the low-temperature medium enters the cooler 20 to exchange heat with the coolant. The secondary refrigerant is required to be low in freezing point, high in boiling point, liquid at normal temperature and normal pressure, not easy to volatilize, good in liquidity, non-flammable, explosive and non-toxic, and has the characteristics of large specific heat, low ODP (ozone depletion potential) and GWP (global warming potential) coefficient and low price.
In order to satisfy the above conditions, the coolant of this embodiment is usually a solution of a part of inorganic salts with low freezing point, a part of HCFCs such as R123, R141b, and R225ca, and electronic fluorinated liquid such as HFE7000-7500 and HFE347, and may also be a solution of a part of small amount of alcohols and freon.
Further, the coolant after heat exchange with the low temperature medium enters the cold accumulator 30 for cold accumulation. The cold storage device 30 of the present embodiment contains a cold storage agent therein, and the cold storage agent absorbs the cold of the secondary refrigerant to store cold. The cold storage amount of the coolant is generally composed of three parts: A. solid sensible heat from the temperature of a secondary refrigerant inlet to the phase change temperature of the coolant; B. phase change latent heat of the coolant; C. the liquid sensible heat between the phase-change temperature of the coolant and the outlet temperature of the cold energy utilization device.
In this embodiment, the low temperature port of the cold accumulator 30 is connected to the outlet of the second channel 22 of the cooler 20 through a pipeline, so that the coolant in the cooler 20 enters the cold accumulator 30 for cold accumulation, that is, the cold storage agent in the cold accumulator 30 exchanges heat with the coolant, so that the cold energy is stored in the cold storage agent.
A first temperature sensor 81 is arranged on a pipeline between the low-temperature port of the cold accumulator 30 and the outlet of the second channel 22, and the first temperature sensor 81 is used for detecting the temperature of the coolant in the pipeline between the low-temperature port of the cold accumulator 30 and the outlet of the second channel 22.
In this embodiment, the cold port of the regenerator 30 is used for the low temperature coolant to enter the regenerator 30, and the high temperature port is used for the high temperature coolant to enter or exit the regenerator 30.
The high temperature port of the cold accumulator 30 of the embodiment is communicated with the inlet of the cold energy utilization device 40 through a pipeline, so that the cold-carrying agent after cold accumulation and the rest of the cold-carrying agent after heat exchange with the low temperature medium converge to enter the cold energy utilization device 40, and the cold energy utilization device 40 utilizes the cold energy.
In this embodiment, the cold energy utilization device 40 may be an air separation device, a refrigeration house, a seafood quick freezing device, a low-temperature rubber pulverizing device, an ice making device, a building air conditioning device, or may be a cold chain transportation refrigerator car or a mobile cold-filling vehicle. When the cold energy utilization device 40 is used to charge a mobile cold vehicle, it is used to charge a refrigerator car or a stationary cold spot flow.
A second control valve 62 is arranged on a pipeline between the low-temperature port of the cold accumulator 30 and the inlet of the cold energy utilization device 40, and the second control valve 62 is used for controlling the flow of the secondary refrigerant in the pipeline between the low-temperature port of the cold accumulator 30 and the inlet of the cold energy utilization device 40.
Further, the outlet of the cold energy utilization device 40 is in communication with the inlet of the second passage 22 in the cooler 20 through a pipe. The secondary refrigerant after the cold energy utilization device 40 utilizes the cold energy is returned to the cooler 20 through the pipeline, and exchanges heat with the low-temperature medium in the first channel 21 again to absorb the cold energy again, thereby completing the circulation of cold energy.
The cold carrier pump 50 is disposed on the pipeline between the outlet of the cold energy utilizing device 40 and the inlet of the second channel 22, and is used for circulating the coolant among the cooler 20, the cold accumulator 30 and the cold energy utilizing device 40, so as to achieve the purpose of cold energy transmission.
In the present embodiment, a ninth control valve 63 is provided on a pipe between the outlet of the cold energy utilizing apparatus 40 and the cold carrier pump 50. The ninth control valve 63 is used to open and close the line between the outlet of the cold energy utilizing apparatus 40 and the cold carrier pump 50, thereby controlling the flow of the coolant in this line.
In this embodiment, a first control valve 64 is also provided in the conduit between the outlet of the cold energy utilizing apparatus 40 and the inlet of the second passage 22. The first control valve 64 is used to open and close a line between the outlet of the cold energy utilizing apparatus 40 and the inlet of the second passage 22, thereby controlling the flow of the coolant in the line.
Further, the operating system 100 of the present embodiment further includes a first branch pipe 73. One end of the first branch pipe 73 communicates with a high temperature port of the regenerator 30, and the other end communicates with a pipe between a low temperature port of the regenerator 30 and an inlet of the cold energy utilizing apparatus 40.
Through the first branch pipes 73, the coolant having a higher temperature, which is heated after heat exchange with the coolant in the cold accumulator 30 for cold storage, can be collected into the pipe between the low-temperature port of the cold accumulator 30 and the inlet of the cold energy utilizing device 40, and be collected with the coolant having a lower temperature, which flows out from the low-temperature port of the cold accumulator 30, and finally flow into the cold energy utilizing device 40 to be utilized by the cold energy utilizing device 40.
Through mixing the secondary refrigerant with higher temperature and the secondary refrigerant with lower temperature, the temperature of the inlet temperature of the cold energy utilization equipment 40 can be ensured to be constant when the working condition of the cold accumulator 30 changes while the requirement of the use temperature of the cold energy utilization equipment 40 is met.
The first branch pipe 73 is provided with a third control valve 74, and the third control valve 74 is used for controlling the flow resistance of the first branch pipe 73, thereby realizing the control of the flow rate of the secondary refrigerant in the first branch pipe 73.
In the present embodiment, a second temperature sensor 82 is provided on a pipe line between the low temperature port of the regenerator 30 and the inlet of the cold energy utilizing device 40. The second temperature sensor 82 is disposed on the pipeline at a position downstream of the connection of the first branch pipe 73 to the pipeline. The second temperature sensor 82 is used to detect the temperature of the coolant entering the cold energy utilizing device 40 in the pipe between the outlet of the cold accumulator 30 and the inlet of the cold energy utilizing device 40.
The operating system 100 of this embodiment further includes a third temperature sensor 83, and the third temperature sensor 83 is disposed in the conduit between the cold energy utilizing apparatus 40 and the cold carrier pump 50 and is configured to detect the temperature of the coolant flowing from the cold energy utilizing apparatus 40.
In this embodiment, the operation system 100 includes a controller electrically connected to the first temperature sensor 81, the second temperature sensor 82, and the third temperature sensor 83 for receiving the temperature signals fed back by the temperature sensors. The controller is in communication connection with the motor of the cold-carrying pump 50, and can regulate and control the rotating speed of the cold-carrying pump 50 according to the temperature signal fed back by the third temperature sensor 83, so as to achieve the purpose of regulating the flow of the secondary refrigerant.
Further, the operation system 100 of the present embodiment further includes a connection pipe 75, and the connection pipe 75 connects the cold load pump 50 and the high temperature port of the cold accumulator 30.
With respect to the cold storage device 30 and the cold energy utilizing device 40, the coolant (i.e., the coolant with a higher temperature) after the cold energy utilized by the cold energy utilizing device 40 enters the cold storage device 30 through the high temperature port of the cold storage device 30 by the action of the cold carrier pump 50. The coolant having a relatively high temperature can exchange heat with the coolant having stored the cooling energy in the cold accumulator 30, thereby providing the corresponding cooling energy.
In the present embodiment, a seventh control valve 76 is provided on the connection pipe 75. The seventh control valve 76 is used to control the flow resistance of the connection pipe 75, thereby controlling the flow rate of the coolant in the connection pipe 75.
Further, the operation system 100 of the present embodiment further includes a mobile cooling device 92. When the supply of the low-temperature medium in the cryogenic tank 10 is stopped or the supply of the cold energy is insufficient and the cold energy utilizing device 40 needs to continuously use the cold, the mobile cold charging device 92 can charge the cold accumulator 30 and supply the cold to the cold energy utilizing device 40.
In the present embodiment, the mobile cold charging device 92 may be a mobile cold charging vehicle including a mobile cold accumulator 93 and a mobile cold load pump 94, the mobile cold accumulator 93 containing a cold storage agent. Wherein, the inlet of the movable cold accumulator 93 is communicated with the movable cold loading pump 94 through a pipeline.
The higher temperature coolant is pumped by the mobile coolant pump 94 and pressurized before entering the mobile cold accumulator 93. In the mobile regenerator 93, the coolant having a relatively high temperature exchanges heat with the coolant having a low temperature, and the coolant absorbs the cooling energy and lowers the temperature.
The outlet of the mobile charging device 92 (i.e., the outlet of the mobile regenerator 93) communicates with the low temperature port of the regenerator 30 through a conduit. The inlet of the mobile cold charging device 92 (i.e. the inlet of the mobile regenerator 93) communicates via a conduit with the high temperature port of the regenerator 30 via a mobile cold load pump 94.
In this embodiment, the piping between the outlet of the mobile cold charging device 92 and the inlet of the regenerator 30 includes a first transition pipe 95 and a first extension pipe 96 connected. The free end of the first transition tube 95 is in communication with the low temperature port of the regenerator 30 and the free end of the first extension tube 96 is in communication with the outlet of the mobile regenerator 93 of the mobile cold charging device 92.
The piping between the inlet of the mobile cold charge device 92 and the high temperature port of the regenerator 30 includes a second transition pipe 97 and a second outer connection pipe 98. The free end of the second transition pipe 97 is communicated with the high temperature port of the cold accumulator 30, and the free end of the second external connection pipe 98 is communicated with the mobile cold-carrying pump 94 in the cold accumulation device.
The tenth control valve 65 is disposed on the first external pipe 96 of this embodiment, and the tenth control valve 65 is used to control the on/off of the pipeline between the outlet of the mobile cold charging device 92 and the low temperature port of the cold accumulator 30, so as to control the circulation of the coolant in the pipeline. The eleventh control valve 66 is disposed on the second external connection pipe 98, and the eleventh control valve 66 is used for controlling the on-off of a pipeline between the inlet of the mobile cold charging device 92 and the high temperature port of the cold accumulator 30, so as to control the circulation of the coolant in the pipeline.
In this embodiment, the first extension tube 96 communicates with the first transition tube 95 via a quick coupler 99, and the second extension tube 98 communicates with the second transition tube 97 via a quick coupler 99. The quick coupler 99 enables quick connection between the first extension tube 96 and the first transition tube 95, and between the second extension tube 98 and the second transition tube 97.
In the operation process of the cold energy storage, recovery and supply system 100 of this embodiment, when the amount of cold generated by vaporization of the cryogenic medium is greater than the amount of cold required by the cold energy utilization device 40, the coolant passes through the cold loading pump 50 and then enters the cooler 20 through the first control valve 64, and the coolant and the cryogenic medium perform heat exchange in the cooler 20, so that the coolant has cold.
The coolant with low temperature and cold capacity enters the cold accumulator 30 and then is divided into two paths: one path enters the cold energy utilization equipment 40 through the second control valve 62, and the cold energy utilization equipment 40 uses cold energy; the other path of cold carrying agent with surplus cold exchanges heat with the cold storage agent in the cold storage device 30, the cold storage agent stores cold, and the cold carrying agent absorbs heat to heat up to form cold carrying agent with higher temperature.
The coolant having a relatively high temperature flows out of the high temperature port of the regenerator 30, passes through the third control valve 74, and enters the first branch pipe 73. The higher temperature coolant in the first branch pipes 73 is collected into the piping between the low temperature port of the regenerator 30 and the inlet of the cold energy utilizing device 40, and is collected with the lower temperature coolant to flow into the cold energy utilizing device 40 together.
After the cold energy is utilized in the cold energy utilization device 40, the coolant has a high temperature and no cold energy utilization value, and finally flows into the cold-carrying pump 50 to circulate.
In this process, the controller of the operating system 100 can control the rotational speed of the coolant pump 50 by receiving the temperature signal detected by the third temperature sensor 83 and can control the opening degree of the seventh control valve 76, so as to achieve the purpose of adjusting the flow rate of the coolant, prevent the coolant from being frozen in the cooler 20, and ensure the normal operation of the whole system. Meanwhile, the opening degree of the second control valve 62 can be automatically adjusted according to the cold demand of the cold energy utilization device 40, so as to adjust the flow distribution of the coolant entering the cold accumulator 30 and the cold energy utilization device 40.
When the vaporized cold energy of the cryogenic medium is less than the cold energy required by the cold energy utilization device 40: the secondary refrigerant is divided into two paths after passing through the secondary refrigerant pump 50: the first path of coolant enters the cooler 20 through the first control valve 64, the coolant exchanges heat with the low-temperature medium in the cooler 20 to form coolant with lower temperature, and the coolant with lower temperature enters the cold accumulator 30 through the low-temperature port of the cold accumulator 30; the second channel of coolant enters the cold accumulator 30 through the seventh control valve 76 from the high temperature port to absorb the cold of the coolant, thereby forming a coolant with a lower temperature.
The coolant in the second path is merged with the coolant in the first path, passes through the second control valve 62, and enters the cold energy utilization device 40. The coolant gives off cold energy in the cold energy utilization device 40 and heats up, and the heated coolant returns to the coolant pump 50 for circulation.
When the supply of the cryogenic medium is stopped, the operation system 100 performs the operations of: the first control valve 64 is closed, the coolant passes through the coolant pump 50 and then enters the cold storage device 30 through the high temperature port via the seventh control valve 76, the coolant collects cold in the cold storage device 30 and then enters the cold energy utilization device 40 via the second control valve 62 to release cold and raise the temperature, and the warmed coolant flows into the coolant pump 50 again for circulation. In this process, the flow rate can be controlled by automatically adjusting the rotation speed of the cold load pump 50, thereby satisfying the cold requirement of the cold energy utilization device 40.
When the supply of the low-temperature medium is stopped and the cold energy utilization device 40 needs to continuously supply cold, the operation system 100 performs cold charging through the external mobile cold charging device 92, and the operation is as follows: the first external connecting pipe 96 and the first transition pipe 95 are communicated through the quick coupler 99, the second external connecting pipe 98 and the second transition pipe 97 are communicated, the cold pump 50 stops working, and the first control valve 64 and the ninth control valve 63 are closed.
The coolant with higher temperature is sucked and pressurized by the movable coolant pump 94, and is cooled by absorbing the cold of the coolant when the cold accumulator 93 is moved, and the coolant with lower temperature is divided into two paths after entering the cold accumulator 30: one path of secondary refrigerant enters the cold accumulator 30 to charge cold for the cold storage agent, so that the cold accumulator 30 stores cold; the other path enters the cold energy utilization equipment 40 through the second control valve 62 for cooling, the cold energy utilization equipment 40 utilizes cold energy, the cold carrying agent after temperature rise enters the seventh control valve 76 through the cold carrying pump 50, and then the two paths are divided into two paths: the first path of the cold-carrying medium enters the first branch pipe 73 and the low-temperature cold-carrying medium passing through the second control valve 62 is converged and enters the cold energy utilization device 40 to realize cold release, and the other path of the cold-carrying medium and the cold-carrying medium in the cold accumulator 30 after being cooled by the cold-carrying medium are converged and flow back to the mobile cold-carrying device 92 after passing through the second transition pipe 97 and the second external connecting pipe 98.
When the cold storage device 30 is full of cold, i.e., the cold storage agent stores cold, the operation process is finished.
In this process, the opening degree of the second control valve 62 can be automatically adjusted according to the requirement of the cooling capacity of the cold energy utilization device 40, so as to adjust the flow distribution of the coolant into the cold accumulator 30 and the cold energy utilization device 40. While the flow of the coolant into the first branch pipe 73 can be adjusted by adjusting the opening degree of the third control valve 74.
For the operation system of cold energy storage, recovery and supply of this embodiment, the secondary refrigerant can exchange heat with the low-temperature medium to cool down and obtain cold energy through the cooler, the secondary refrigerant with cold energy enters the cold accumulator and can exchange heat with the coolant to store the cold energy in the cold accumulator, the interval of solid sensible heat, solid-liquid phase change latent heat and liquid sensible heat of the coolant is utilized in a superposition manner, the cold accumulation efficiency is improved, meanwhile, the secondary refrigerant can transmit the cold energy to the cold energy utilization device in a balanced and continuous manner, and the cold energy utilization device is enabled to utilize the cold energy. The refrigerating medium circulates in the whole operation system, so that the synchronous recovery, storage and supply of the cold energy of the low-temperature medium can be realized, the cold energy of the low-temperature medium can be effectively recycled, and the recycling efficiency of the cold energy can be improved.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. An operating system for cold energy storage, recovery and supply, comprising:
the low-temperature storage tank is internally provided with a low-temperature medium;
a cooler including a first passage for circulating the low-temperature medium and a second passage for circulating a coolant, the first passage and the second passage being independent of each other; the low-temperature storage tank is communicated with an inlet of the first channel through a pipeline, and the low-temperature medium enters the first channel and exchanges heat with the secondary refrigerant circulating in the second channel;
the cold accumulator is internally provided with cold storage agent for storing cold energy and comprises a high-temperature port and a low-temperature port; a low-temperature port of the cold accumulator is communicated with an outlet of the second channel through a pipeline, and the secondary refrigerant enters the cold accumulator and exchanges heat with the cold storage agent;
the inlet of the cold energy utilization device is communicated with the high-temperature port of the cold accumulator through a pipeline; the outlet of the cold energy utilization equipment is communicated with the inlet of the second channel through a pipeline, so that the secondary refrigerant after heat exchange of the cold energy utilization equipment enters the cooler;
and the cold carrying pump is arranged on a pipeline between the outlet of the cold energy utilization equipment and the inlet of the cooler.
2. A cold energy storage, recovery and supply operation system according to claim 1, further comprising a first control valve provided on a pipeline between the cold load pump and the inlet of the cooler, and a second control valve provided on a pipeline between the cold temperature port of the cold accumulator and the inlet of the cold energy utilizing device.
3. A cold energy storage, recovery and supply operation system according to claim 1, further comprising a first branch pipe having one end communicating with the high temperature port of the regenerator and the other end communicating with a pipe between the low temperature port of the regenerator and the inlet of the cold energy utilizing apparatus.
4. A cold energy storage, recovery and supply operation system according to claim 3, further comprising a third control valve provided on the first branch pipe.
5. The cold energy storage, recovery and supply operating system of claim 1, further comprising a connecting pipe communicating the cold load pump and the high temperature port of the cold accumulator.
6. The cold energy storage, recovery and supply operating system of claim 5, further comprising a seventh control valve disposed on the connecting pipe.
7. A cold energy storage, recovery and supply operation system according to claim 1, further comprising a vaporizer, an inlet of which communicates with an outlet of the first passage through a pipeline.
8. The cold energy storage, recovery and supply operation system according to claim 7, further comprising a third branch pipe and a fifth control valve, one end of the third branch pipe communicating with a pipe between the outlet of the cryogenic tank and the inlet of the first channel, and the other end of the third branch pipe communicating with a pipe between the outlet of the first channel and the inlet of the vaporizer; the fifth control valve is provided on the third branch pipe.
9. A cold energy storage, recovery and supply operational system according to claim 1, further comprising a mobile cold charge device, the outlet of which communicates with the cold temperature port of the regenerator via a conduit, and the inlet of which communicates with the high temperature port of the regenerator via a conduit.
10. A cold energy storage, recovery and supply operation system according to claim 9, wherein the piping between the outlet of the mobile cold charge apparatus and the cold temperature port of the cold accumulator comprises a first transition pipe and a first external pipe connected, a free end of the first transition pipe is communicated with the cold temperature port of the cold accumulator, a free end of the first external pipe is communicated with the outlet of the mobile cold charge apparatus, and the first transition pipe is communicated with the first external pipe through a quick-attach joint;
the pipeline between the inlet of the mobile cold charging equipment and the high-temperature port of the cold accumulator comprises a second transition pipe and a second outer connecting pipe, the free end of the second transition pipe is communicated with the high-temperature port of the cold accumulator, the free end of the second outer connecting pipe is communicated with the inlet of the mobile cold charging equipment, and the second transition pipe is communicated with the second outer connecting pipe through a quick coupler.
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| CN202110672323.5A CN115479421A (en) | 2021-06-15 | 2021-06-15 | Operating system for storing, recovering and supplying cold energy |
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