Operational systems for cold energy storage, recovery and supply

Abstract

The present invention provides an operation system for storing, recovering and supplying cold energy, which includes a low-temperature storage tank, a cooler, a cold storage device, a cold energy utilization device and a cold-carrying pump. A low-temperature medium is contained in the low-temperature storage tank. The operation system for storing, recovering and supplying cold energy can obtain cold energy by heat exchange and cooling with the low-temperature medium through the cooler. The coolant with cold energy enters the cold storage device and can exchange heat with the cold storage device to store the cold energy in the cold storage device, and the solid sensible heat, solid-liquid phase change latent heat and liquid sensible heat interval of the cold storage device are superimposed and utilized to improve the cold storage efficiency. At the same time, the coolant can evenly and continuously transmit the cold energy to the cold energy utilization device, so that the cold energy utilization device can utilize the cold energy. The coolant circulates in the entire operation system, and the recovery, storage and supply of the cold energy of the low-temperature medium can be realized simultaneously, so that the cold energy of the low-temperature medium can be effectively recovered and utilized, and it is beneficial to improve the recovery and utilization efficiency of cold energy.

Description

Technical Field

[0001] The present invention relates to the technical field of cold energy utilization, and in particular to an operating system for cold energy storage, recovery and supply, which is used to realize the simultaneous recovery, storage and supply of cold energy. Background Art

[0002] LNG is a low-temperature (-162°C) liquid mixture formed by desulfurization, dehydration and carbon dioxide removal of gaseous natural gas and liquefaction through a low-temperature process. Before being supplied to downstream users, LNG must be gasified and heated to above 0°C before being input into the pipeline network. When LNG is gasified, a large amount of cold energy is released. The cold energy released by gasification of each ton of LNG is about 220kW·h. By recycling and utilizing this part of cold energy through specific process technology, the purpose of energy conservation and environmental protection as well as the expansion of the LNG industry chain can be achieved.

[0003] In addition, industrial gases such as oxygen, nitrogen and argon stored in liquid form also need to be heated and gasified when used, just like LNG, and this part of the cold is not used. Among them, LNG, liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen, liquid helium, liquid ethane, liquid ethylene, etc. can all be collectively referred to as cryogenic media.

[0004] At present, LNG cold energy has been applied in industries such as power generation, air separation, rubber crushing, dry ice manufacturing, and cold storage. Most cold energy release processes are characterized by volatility and discontinuity, and the cold-using locations such as air separation, rubber crushing, dry ice manufacturing, and cold storage are often not together with the LNG vaporization locations. The collected cold energy needs to be stored first, and then the stored cold energy needs to be transported and then supplied, which cannot be carried out continuously, resulting in most of the cold energy being unable to be effectively recycled and utilized, resulting in the problem of low cold energy utilization efficiency. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the cold energy generated by the low-temperature medium needs to be stored first, and then the stored cold energy needs to be transported and then supplied, which cannot be carried out continuously and cannot be efficiently recycled, resulting in low efficiency of cold energy utilization.

[0006] In order to solve the above technical problems, the present invention provides an operation system for storing, recovering and supplying cold energy, including a low-temperature storage tank, a cooler, a cold storage device, a cold energy utilization device and a cold-carrying pump, wherein a low-temperature medium is contained in the low-temperature storage tank; the cooler includes a first channel for circulating the low-temperature medium and a second channel for circulating the cold-carrying agent, and the first channel and the second channel are independent of each other; the low-temperature storage tank is connected to the inlet of the first channel through a pipeline, and the low-temperature medium enters the first channel and exchanges heat with the cold-carrying agent circulating in the second channel; the cold storage device contains a cold-carrying agent for storing and recovering cold energy; the cold storage device includes ... A coolant for storing cold energy, the coolant comprising a high-temperature port and a low-temperature port; the low-temperature port of the coolant is connected to the outlet of the second channel via a pipeline, the coolant enters the coolant and exchanges heat with the coolant; the inlet of the cold energy utilization device is connected to the high-temperature port of the coolant via a pipeline; the outlet of the cold energy utilization device is connected to the inlet of the second channel via a pipeline, so that the coolant enters the cooler after the heat exchange in the cold energy utilization device is completed; a coolant pump is arranged on the pipeline between the outlet of the cold energy utilization device and the inlet of the cooler.

[0007] Optionally, the operating system also includes a first control valve and a second control valve, wherein the first control valve is arranged on the pipeline between the cold load pump and the inlet of the cooler, and the second control valve is arranged on the pipeline between the low-temperature port of the cold storage device and the inlet of the cold energy utilization device.

[0008] Optionally, the operating system also includes a first branch pipe, one end of which is connected to the high-temperature port of the cold storage device, and the other end of the first branch pipe is connected to the pipeline between the low-temperature port of the cold storage device and the inlet of the cold energy utilization device.

[0009] Optionally, the operating system further includes a third control valve, and the third control valve is arranged on the first branch pipe.

[0010] Optionally, the operating system further includes a connecting pipe, which connects the cooling pump and a high-temperature port of the cold storage device.

[0011] Optionally, the operating system further includes a seventh control valve, and the seventh control valve is arranged on the connecting pipe.

[0012] Optionally, the operating system further comprises a vaporizer, and an inlet of the vaporizer is connected to an outlet of the first channel through a pipeline.

[0013] Optionally, the operating system also includes a third branch pipe and a fifth control valve, one end of the third branch pipe is connected to the pipeline between the outlet of the low-temperature storage tank and the inlet of the first channel, and the other end of the third branch pipe is connected to the pipeline between the outlet of the first channel and the inlet of the vaporizer; the fifth control valve is arranged on the third branch pipe.

[0014] Optionally, the operating system further comprises a mobile cold-charging device, an outlet of the mobile cold-charging device is connected to a low-temperature port of the cold storage device via a pipeline, and an inlet of the mobile cold-charging device is connected to a high-temperature port of the cold storage device via a pipeline.

[0015] Optionally, the pipeline between the outlet of the mobile cold-charging device and the low-temperature port of the cold storage device includes a first transition pipe and a first external pipe connected to each other, the free end of the first transition pipe is connected to the low-temperature port of the cold storage device, the free end of the first external pipe is connected to the outlet of the mobile cold-charging device, and the first transition pipe and the first external pipe are connected via a quick-release connector; the pipeline between the inlet of the mobile cold-charging device and the high-temperature port of the cold storage device includes a second transition pipe and a second external pipe, the free end of the second transition pipe is connected to the high-temperature port of the cold storage device, the free end of the second external pipe is connected to the inlet of the mobile cold-charging device, and the second transition pipe and the second external pipe are connected via a quick-release connector.

[0016] It can be seen from the above technical solution that the beneficial effects of the present invention are:

[0017] In the cold energy storage, recovery and supply operation system of the present invention, the coolant in the cooler can exchange heat with the low-temperature medium to obtain cold energy. The coolant with cold energy enters the cold storage device and can exchange heat with the cold storage device to store cold energy in the cold storage device. The solid sensible heat, solid-liquid phase change latent heat and liquid sensible heat interval of the cold storage device are superimposed and utilized to improve the cold storage efficiency. At the same time, the coolant can evenly and continuously transmit the cold energy to the cold energy utilization device, so that the cold energy utilization device can utilize the cold energy. The coolant circulates in the entire operation system, which can realize the simultaneous recovery, storage and supply of the cold energy of the low-temperature medium, so that the cold energy of the low-temperature medium can be effectively recovered and utilized, and it is beneficial to improve the recovery and utilization efficiency of cold energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of an operating system for cold energy storage, recovery and supply of the present invention.

[0019] The reference numerals are as follows: 100, operating system; 10, low-temperature storage tank; 20, cooler; 21, first channel; 22, second channel; 30, cold storage device; 40, cold energy utilization equipment; 50, cold pump; 61, sixth control valve; 62, second control valve; 63, ninth control valve; 64, first control valve; 65, tenth control valve; 66, eleventh control valve; 71, third branch pipe; 72, fifth control valve; 73, first branch pipe; 74, third control valve; 75, connecting pipe; 76, seventh control valve; 81, first temperature sensor; 82, second temperature sensor; 83, third temperature sensor; 91, vaporizer; 92, mobile cold charging equipment; 93, mobile cold storage device; 94, mobile cold pump; 95, first transition pipe; 96, first external pipe; 97, second transition pipe; 98, second external pipe; 99, quick connector. DETAILED DESCRIPTION

[0020] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0021] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0022] See also Figure 1 An embodiment of the present application provides an operating system 100 for storing, recovering and supplying cold energy (hereinafter referred to as "operating system 100"), which can recover and store the cold energy released when the low-temperature medium is vaporized, and can utilize the stored cold energy to realize the simultaneous storage and supply procedures, thereby effectively improving the utilization efficiency of cold energy.

[0023] The operating system 100 of this embodiment includes a low-temperature storage tank 10 , a cooler 20 , a cold storage device 30 , a cold energy utilization device 40 , and a cold pump 50 .

[0024] The cryogenic storage tank 10 contains a cryogenic medium. The cooler 20 includes a first channel 21 for circulating the cryogenic medium and a second channel 22 for circulating the coolant, and the first channel 21 and the second channel 22 are independent of each other. The cryogenic storage tank 10 is connected to the inlet of the first channel 21 through a pipeline, and the cryogenic medium enters the first channel 21 and performs heat exchange with the coolant circulating in the second channel 22. The cold storage device 30 contains a coolant for storing cold energy, and the cold storage device 30 includes a high-temperature port and a low-temperature port. The low-temperature port of the cold storage device 30 is connected to the outlet of the second channel 22 through a pipeline, and the coolant enters the cold storage device 30 and performs heat exchange with the coolant.

[0025] The inlet of the cold energy utilization device 40 is connected to the high temperature port of the cold storage device 30 through a pipeline. 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 is completed enters the cooler 20. The coolant pump 50 is arranged on the pipeline between the outlet of the cold energy utilization device 40 and the inlet of the cooler 20.

[0026] Furthermore, the cryogenic medium of this embodiment is LNG, which releases a large amount of cold energy when gasified, and the cold energy released by gasification of each ton of LNG is about 220kW·h. In addition to LNG, the cryogenic medium can also be liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen, liquid helium, liquid ethane, liquid ethylene, etc.

[0027] The cryogenic medium is contained in the cryogenic storage tank 10, which may be a large LNG storage tank at an LNG receiving terminal, a small or medium-sized LNG storage tank located at each satellite vaporization station, a liquid oxygen or liquid nitrogen storage tank of each industrial gas customer, or an LNG cylinder on a refrigerated vehicle powered by LNG, a ship LNG fuel storage tank, etc. There are no excessive restrictions on the cryogenic storage tank 10, as long as it can contain the cryogenic medium.

[0028] In this embodiment, the cooler 20 is used for heat exchange between the cryogenic medium and the coolant. The liquid cryogenic medium vaporizes and heats up, so that the coolant absorbs the cold energy released by the cryogenic medium and cools down.

[0029] The cooler 20 of this embodiment includes a first channel 21 and a second channel 22 which are independent of each other. The first channel 21 is used to circulate the low-temperature medium, and the second channel 22 is used to circulate the secondary coolant. The inlet of the first channel 21 is connected to the low-temperature storage tank 10 through a pipeline. The low-temperature medium enters the first channel 21 and exchanges heat with the secondary coolant circulating in the second channel 22, so that the secondary coolant absorbs cold energy and cools down.

[0030] A sixth control valve 61 is provided on the pipeline between the inlet of the first channel 21 and the cryogenic storage tank 10 . The sixth control valve 61 is used to control the on-off of the pipeline between the cryogenic storage tank 10 and the inlet of the first channel 21 in the cooler 20 , thereby controlling the circulation of the cryogenic medium in the cooler 20 .

[0031] In this embodiment, the operation system 100 further includes a vaporizer 91, which is used to heat the cryogenic medium to meet the supply temperature. The vaporizer 91 can be a large LNG seawater heating vaporizer at an LNG receiving terminal, a small or medium-sized LNG air-temperature vaporizer or water-bath vaporizer located at each satellite vaporization station, a liquid oxygen or liquid nitrogen air-temperature vaporizer or water-bath vaporizer of each industrial gas customer, a vehicle-mounted LNG vaporizer, a ship LNG vaporizer, etc.

[0032] The inlet of the vaporizer 91 is connected to the outlet of the first channel 21 in the cooler 20 through a pipeline. The liquid low-temperature medium enters the vaporizer 91 and is vaporized, and then enters the natural gas network or subsequent gas-using equipment through the pipeline.

[0033] The operating system 100 of this embodiment further includes a third branch pipe 71 and a fifth control valve 72. One end of the third branch pipe 71 is connected to the pipeline between the outlet of the cryogenic storage tank 10 and the inlet of the first channel 21, and the other end is connected to the pipeline between the outlet of the first channel 21 and the inlet of the vaporizer 91. The connection point between the third branch pipe 71 and the pipeline between the outlet of the cryogenic storage tank 10 and the inlet of the first channel 21 is located upstream of the sixth control valve 61.

[0034] The fifth control valve 72 is disposed on the third branch pipe 71 and is used to control the on-off of the third branch pipe 71. When the cold energy storage and supply of the low-temperature medium meet the demand, 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 gasification treatment and then enters the natural gas network or subsequent gas-using equipment through the pipeline.

[0035] When there is a need for cold storage and cold energy supply, the low-temperature medium enters the cooler 20 to exchange heat with the coolant. The coolant is required to have a low freezing point, a high boiling point, be liquid at room temperature and pressure, not easy to volatilize, and have good fluidity. It is also required to be a non-flammable, non-explosive and non-toxic substance, and has the characteristics of large specific heat, low ODP and GWP coefficients, and low price.

[0036] To meet the above conditions, the refrigerant in this embodiment is usually a partial inorganic salt aqueous solution with a low freezing point, some HCFC substances such as R123, R141b, R225ca and electronic fluorine liquid products such as HFE7000-7500, HFE347, etc., and can also be a solution of a small amount of alcohol substances and Freon.

[0037] Furthermore, the coolant after heat exchange with the low-temperature medium will enter the cold storage device 30 for cold storage. The cold storage device 30 of this embodiment contains a coolant inside, and the coolant absorbs the coldness of the coolant to store cold. The cold storage capacity of the coolant is generally composed of three parts: A. solid sensible heat from the coolant inlet temperature to the coolant phase change temperature; B. coolant phase change latent heat; C. liquid sensible heat from the coolant phase change temperature to the outlet temperature of the cold energy utilization device.

[0038] In this embodiment, the low-temperature port of the cold storage device 30 is connected to the outlet of the second channel 22 in the cooler 20 through a pipeline, so that the coolant in the cooler 20 enters the cold storage device 30 for cold storage, that is, the coolant in the cold storage device 30 exchanges heat with the coolant, so that the cold energy is stored in the coolant.

[0039] A first temperature sensor 81 is provided on the pipeline between the low temperature port of the cold storage device 30 and the outlet of the second channel 22 . The first temperature sensor 81 is used to detect the temperature of the coolant in the pipeline between the low temperature port of the cold storage device 30 and the outlet of the second channel 22 .

[0040] In this embodiment, the low-temperature port of the cold storage tank 30 is used for the coolant with a lower temperature to enter the cold storage tank 30 , and the high-temperature port is used for the coolant with a higher temperature to enter or flow out of the cold storage tank 30 .

[0041] The high-temperature port of the cold storage device 30 of this embodiment is connected to the inlet of the cold energy utilization device 40 through a pipeline, so that the coolant after completing the cold storage and the remaining coolant after heat exchange with the low-temperature medium converge into the cold energy utilization device 40, so that the cold energy utilization device 40 utilizes the cold energy.

[0042] In this embodiment, the cold energy utilization device 40 can be an air separation device, a cold storage, a seafood quick freezing device, a low-temperature rubber crushing device, an ice making device, a building air conditioning device, or a cold chain transport refrigerated compartment or a mobile refrigeration charging vehicle. When the cold energy utilization device 40 is a mobile refrigeration charging vehicle, it is used to refrigerate the refrigerated vehicle or a fixed cold spot.

[0043] A second control valve 62 is provided on the pipeline between the low-temperature port of the cold storage device 30 and the inlet of the cold energy utilization device 40. The second control valve 62 is used to control the flow rate of the refrigerant in the pipeline between the low-temperature port of the cold storage device 30 and the inlet of the cold energy utilization device 40.

[0044] Furthermore, the outlet of the cold energy utilization device 40 is connected to the inlet of the second channel 22 in the cooler 20 through a pipeline. The refrigerant after being utilized by the cold energy utilization device 40 is returned to the cooler 20 through the pipeline, and heat exchanges with the low-temperature medium in the first channel 21 again, reabsorbing the cold energy, and completing the circulation of the cold amount.

[0045] The coolant pump 50 is arranged on the pipeline between the outlet of the cold energy utilization device 40 and the inlet of the second channel 22, and is used to realize the circulation of the coolant between the cooler 20, the cold storage device 30 and the cold energy utilization device 40, so as to achieve the purpose of cold energy transportation.

[0046] In this embodiment, a ninth control valve 63 is provided on the pipeline between the outlet of the cold energy utilization device 40 and the cooling pump 50. The ninth control valve 63 is used to control the opening and closing of the pipeline between the outlet of the cold energy utilization device 40 and the cooling pump 50, thereby controlling the circulation of the cooling agent in this section of the pipeline.

[0047] In this embodiment, a first control valve 64 is further provided on the pipeline between the outlet of the cold energy utilization device 40 and the inlet of the second channel 22. The first control valve 64 is used to control the on-off of the pipeline between the outlet of the cold energy utilization device 40 and the inlet of the second channel 22, thereby controlling the circulation of the refrigerant in the pipeline.

[0048] Furthermore, the operating system 100 of this embodiment further includes a first branch pipe 73. One end of the first branch pipe 73 is connected to the high temperature port of the cold storage device 30, and the other end is connected to the pipeline between the low temperature port of the cold storage device 30 and the inlet of the cold energy utilization device 40.

[0049] Through the first branch pipe 73, the higher temperature refrigerant that has been heated up after completing heat exchange and cold storage with the refrigerant in the cold accumulator 30 can be merged into the pipeline between the low-temperature port of the cold accumulator 30 and the inlet of the cold energy utilization device 40, merged with the lower temperature refrigerant flowing out of the low-temperature port of the cold accumulator 30, and finally flowed into the cold energy utilization device 40 to be utilized by the cold energy utilization device 40.

[0050] By mixing a higher temperature refrigerant with a lower temperature refrigerant, the operating temperature requirement of the cold energy utilization device 40 can be met while ensuring that the inlet temperature of the cold energy utilization device 40 remains constant when the operating condition of the cold storage device 30 changes.

[0051] The first branch pipe 73 is provided with a third control valve 74 , and the third control valve 74 is used to control the flow resistance of the first branch pipe 73 , thereby achieving control of the flow rate of the secondary coolant in the first branch pipe 73 .

[0052] In this embodiment, a second temperature sensor 82 is provided on the pipeline between the low temperature port of the cold storage device 30 and the inlet of the cold energy utilization device 40. The second temperature sensor 82 is provided on the pipeline downstream of the connection between the first branch pipe 73 and the pipeline. The second temperature sensor 82 is used to detect the temperature of the coolant entering the cold energy utilization device 40 in the pipeline between the outlet of the cold storage device 30 and the inlet of the cold energy utilization device 40.

[0053] The operating system 100 of this embodiment further includes a third temperature sensor 83 , which is disposed on a pipeline between the cold energy utilization device 40 and the coolant pump 50 , and is used to detect the temperature of the coolant flowing out of the cold energy utilization device 40 .

[0054] In this embodiment, the operating system 100 includes a controller, which is electrically connected to the first temperature sensor 81, the second temperature sensor 82, and the third temperature sensor 83, and is used to receive the temperature signals fed back by each temperature sensor. The controller is connected to the motor of the cooling pump 50 in communication, and the speed of the cooling pump 50 can be adjusted according to the temperature signal fed back by the third temperature sensor 83, so as to achieve the purpose of adjusting the flow rate of the cooling agent.

[0055] Furthermore, the operating system 100 of the present embodiment further includes a connecting pipe 75 , which connects the cooling pump 50 and the high-temperature port of the cold storage device 30 .

[0056] For the cold storage device 30 and the cold energy utilization device 40, the coolant (i.e., the coolant with a higher temperature) after the cold energy utilization device 40 utilizes the cold energy can enter the cold storage device 30 from the high temperature port of the cold storage device 30 through the action of the coolant pump 50. The coolant with a higher temperature can perform heat exchange with the coolant in the cold storage device 30 that has stored cold energy, thereby having corresponding cold energy.

[0057] In this embodiment, a seventh control valve 76 is provided on the connecting pipe 75 . The seventh control valve 76 is used to control the flow resistance of the connecting pipe 75 , thereby controlling the flow rate of the brine in the connecting pipe 75 .

[0058] Furthermore, the operating system 100 of this embodiment further includes a mobile cold charging device 92. When the cryogenic medium in the cryogenic storage tank 10 stops supplying or its cold energy supply is insufficient and the cold energy utilization device 40 needs to continue using cold, the mobile cold charging device 92 can charge cold to the cold storage device 30 and provide cold to the cold energy utilization device 40.

[0059] In this embodiment, the mobile cold charging device 92 may be a mobile cold charging vehicle, which includes a mobile cold storage device 93 and a mobile cold carrying pump 94, wherein a cold storage agent is contained in the mobile cold storage device 93. The inlet of the mobile cold storage device 93 is connected to the mobile cold carrying pump 94 through a pipeline.

[0060] The higher-temperature brine is sucked in and pressurized by the mobile brine pump 94, and then enters the mobile cold storage device 93. In the mobile cold storage device 93, the higher-temperature brine exchanges heat with the lower-temperature cold storage device, and the brine absorbs cold energy and cools down.

[0061] The outlet of the mobile cold charging device 92 (i.e., the outlet of the mobile cold storage device 93) is connected to the low temperature port of the cold storage device 30 through a pipeline. The inlet of the mobile cold charging device 92 (i.e., the inlet of the mobile cold storage device 93) is connected to the high temperature port of the cold storage device 30 through a pipeline via a mobile cold carrying pump 94.

[0062] In this embodiment, the pipeline between the outlet of the mobile cold charging device 92 and the inlet of the cold storage device 30 includes a first transition pipe 95 and a first external pipe 96 connected to each other. The free end of the first transition pipe 95 is connected to the low temperature port of the cold storage device 30, and the free end of the first external pipe 96 is connected to the outlet of the mobile cold storage device 92.

[0063] The pipeline between the inlet of the mobile cold charging device 92 and the high temperature port of the cold storage device 30 includes a second transition pipe 97 and a second external pipe 98. The free end of the second transition pipe 97 is connected to the high temperature port of the cold storage device 30, and the free end of the second external pipe 98 is connected to the mobile cold pump 94 in the cold storage device.

[0064] The first external pipe 96 of this embodiment is provided with a tenth control valve 65, which 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 storage device 30, so as to control the circulation of the coolant in the pipeline. The second external pipe 98 is provided with an eleventh control valve 66, which is used to control the on-off of the pipeline between the inlet of the mobile cold charging device 92 and the high-temperature port of the cold storage device 30, so as to control the circulation of the coolant in the pipeline.

[0065] In this embodiment, the first external tube 96 is connected to the first transition tube 95 via a quick connector 99, and the second external tube 98 is connected to the second transition tube 97 via a quick connector 99. The quick connector 99 can achieve quick connection between the first external tube 96 and the first transition tube 95, and between the second external tube 98 and the second transition tube 97.

[0066] In the actual operation process of the cold energy storage, recovery and supply operating system 100 of this embodiment, when the cold capacity of the vaporized low-temperature medium is greater than the cold capacity required by the cold energy utilization device 40, the refrigerant passes through the refrigerant pump 50 and then enters the cooler 20 through the first control valve 64, and the refrigerant and the low-temperature medium perform heat exchange in the cooler 20 so that the refrigerant has cold capacity.

[0067] The coolant with cold capacity and low temperature enters the cold storage device 30 and is divided into two paths: one path passes through the second control valve 62 and enters the cold energy utilization device 40 to provide cold energy for the cold energy utilization device 40; the other path of coolant with surplus cold capacity exchanges heat with the coolant in the cold storage device 30, the coolant stores cold capacity, and the coolant absorbs heat and heats up to form a coolant with a higher temperature.

[0068] After the higher-temperature coolant flows out from the high-temperature port of the cold storage device 30, it passes through the third control valve 74 and enters the first branch pipe 73. The higher-temperature coolant in the first branch pipe 73 flows into the pipeline between the low-temperature port of the cold storage device 30 and the inlet of the cold energy utilization device 40, and merges with the lower-temperature coolant to flow into the cold energy utilization device 40 together.

[0069] After the brine is used for cooling in the cooling energy utilization device 40 , the temperature of the brine is relatively high and has no cooling energy utilization value, and finally flows into the brine pump 50 for circulation.

[0070] During this process, the controller of the operating system 100 can control the speed of the cooling 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 of the cooling agent, prevent the cooling agent from being frozen in the cooler 20, and ensure the normal operation of the entire system. At the same time, the opening degree of the second control valve 62 can be automatically adjusted according to the cooling requirement of the cold energy utilization device 40, so as to adjust the flow distribution of the cooling agent entering the cold storage device 30 and the cold energy utilization device 40.

[0071] When the vaporization cold energy of the low-temperature medium is less than the cold energy required by the cold energy utilization device 40: the refrigerant is divided into two paths after passing through the refrigerant pump 50: the first path of refrigerant enters the cooler 20 through the first control valve 64, and the refrigerant and the low-temperature medium perform heat exchange in the cooler 20 to form a refrigerant with a lower temperature, and the refrigerant with a lower temperature enters the refrigerant 30 from the low-temperature port of the refrigerant 30; the second path of refrigerant enters the refrigerant 30 from the high-temperature port through the seventh control valve 76, absorbs the cold energy of the refrigerant, and forms a refrigerant with a lower temperature.

[0072] The brine in the second path merges with the brine in the first path, passes through the second control valve 62, and enters the cold energy utilization device 40. The brine releases cold energy and heats up in the cold energy utilization device 40, and the heated brine returns to the brine pump 50 for circulation.

[0073] When the low-temperature medium stops being supplied, the operation of the operating system 100 is as follows: the first control valve 64 is closed, the coolant passes through the coolant pump 50 and then passes through the seventh control valve 76 and then enters the cold storage device 30 from the high-temperature port, the coolant absorbs cold energy in the cold storage device 30 and then passes through the second control valve 62 to enter the cold energy utilization device 40 to release cold energy and heat up, and the heated coolant flows into the coolant pump 50 for circulation. In this process, the flow rate can be controlled by automatically adjusting the speed of the coolant pump 50, so as to meet the cold energy demand of the cold energy utilization device 40.

[0074] When the supply of low-temperature medium stops and the cold energy utilization device 40 needs continuous cooling, the operating system 100 performs cooling through the external mobile cooling device 92. The operation is as follows: the first external pipe 96 and the first transition pipe 95, as well as the second external pipe 98 and the second transition pipe 97 are connected through the quick-release connector 99, the cooling pump 50 stops working, and the first control valve 64 and the ninth control valve 63 are closed.

[0075] The coolant with a higher temperature is sucked in and pressurized by the mobile coolant pump 94, and is cooled by absorbing the cold of the coolant when passing through the mobile cold storage device 93. The coolant with reduced temperature enters the cold storage device 30 and is divided into two paths: one path of the coolant enters the cold storage device 30 to charge the coolant with cold, so that the cold storage device 30 stores cold; the other path enters the cold energy utilization device 40 through the second control valve 62 to release the cold, and the cold energy utilization device 40 utilizes the cold energy. The heated coolant passes through the coolant pump 50 and enters the seventh control valve 76, and is then divided into two paths: the first path enters the first branch pipe 73 and merges with the low-temperature coolant passing through the second control valve 62 to enter the cold energy utilization device 40 for cooling; the other path of the coolant merges with the coolant after being charged with the coolant in the cold storage device 30, passes through the second transition pipe 97 and the second external pipe 98, and then flows back to the mobile cold charging device 92.

[0076] When the cold storage device 30 is fully charged, that is, the cold storage agent has stored cold energy, the operation process ends.

[0077] In this process, the opening of the second control valve 62 can be automatically adjusted according to the cooling capacity requirement of the cold energy utilization device 40, thereby adjusting the flow distribution of the coolant entering the cold storage device 30 and the cold energy utilization device 40. At the same time, the flow of the coolant entering the first branch pipe 73 can be adjusted by adjusting the opening of the third control valve 74.

[0078] For the cold energy storage, recovery and supply operation system of this embodiment, the coolant in the cooler can exchange heat with the low-temperature medium to obtain cold energy. The coolant with cold energy enters the cold storage device and can exchange heat with the cold storage device to store cold energy in the cold storage device. The solid sensible heat, solid-liquid phase change latent heat and liquid sensible heat range of the cold storage device are superimposed and utilized to improve the cold storage efficiency. At the same time, the coolant can evenly and continuously transmit the cold energy to the cold energy utilization device, so that the cold energy utilization device can utilize the cold energy. The coolant circulates in the entire operation system, which can realize the simultaneous recovery, storage and supply of the cold energy of the low-temperature medium, so that the cold energy of the low-temperature medium can be effectively recovered and utilized, and it is beneficial to improve the recovery and utilization efficiency of cold energy.

[0079] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A cold energy storage, recovery and supply operation system, characterized in that: include: A cryogenic storage tank containing a cryogenic medium; The cooler comprises a first channel for circulating the low-temperature medium and a second channel for circulating a coolant, wherein the first channel and the second channel are independent of each other; the low-temperature storage tank is connected with the inlet of the first channel through a pipeline, and the low-temperature medium enters the first channel and performs heat exchange with the coolant circulating in the second channel; A cold storage device containing a cold storage agent for storing cold energy, the cold storage device comprising a high temperature port and a low temperature port; the low temperature port of the cold storage device is connected to the outlet of the second channel through a pipeline, and the coolant enters the cold storage device and performs heat exchange with the cold storage agent; A cold energy utilization device, wherein the inlet of the cold energy utilization device is connected to the high temperature port of the cold storage device through a pipeline; the outlet of the cold energy utilization device is connected to the inlet of the second channel through a pipeline, so that the coolant after the heat exchange in the cold energy utilization device is completed enters the cooler; A cold-carrying pump is arranged on a pipeline between the outlet of the cold energy utilization device and the inlet of the cooler; Wherein, the operation system further comprises a connecting pipe, a second control valve and a seventh control valve, wherein the second control valve is arranged on a pipeline between a low-temperature port of the cold storage device and an inlet of the cold energy utilization device; the connecting pipe is connected to the cold carrying pump and a high-temperature port of the cold storage device, and the seventh control valve is arranged on the connecting pipe; The operating system also includes a controller and a third temperature sensor electrically connected to the controller, the third temperature sensor being arranged on a pipeline between the cold energy utilization device and the cold load pump, the third temperature sensor being used to measure the temperature of the cold load pump flowing out of the cold energy utilization device; the controller is electrically connected to the cold load pump and the seventh control valve, so that the controller can control the rotation speed of the cold load pump and the opening of the seventh control valve according to the temperature signal fed back by the third temperature sensor; the controller is electrically connected to the cold energy utilization device and the second control valve, so that the controller can control the opening of the second control valve according to the cold signal fed back by the cold energy utilization device.

2. The cold energy storage, recovery and supply operation system according to claim 1, characterized in that: The operating system further includes a first control valve. The first control valve is disposed on a pipeline between the cooling pump and the inlet of the cooler.

3. The cold energy storage, recovery and supply operation system according to claim 1, characterized in that: The operating system also includes a first branch pipe, one end of which is connected to the high-temperature port of the cold storage device, and the other end of which is connected to the pipeline between the low-temperature port of the cold storage device and the inlet of the cold energy utilization device.

4. The cold energy storage, recovery and supply operation system according to claim 3, characterized in that: The operating system further includes a third control valve, which is disposed on the first branch pipe.

5. The cold energy storage, recovery and supply operation system according to claim 1, characterized in that: The operating system further includes a vaporizer, the inlet of the vaporizer being in communication with the outlet of the first channel through a pipeline.

6. The cold energy storage, recovery and supply operation system according to claim 5, characterized in that: The operating system also includes a third branch pipe and a fifth control valve. One end of the third branch pipe is connected to the pipeline between the outlet of the low-temperature storage tank and the inlet of the first channel, and the other end of the third branch pipe is connected to the pipeline between the outlet of the first channel and the inlet of the vaporizer. The fifth control valve is arranged on the third branch pipe.

7. The cold energy storage, recovery and supply operation system according to claim 1, characterized in that: The operating system also includes a mobile cold-charging device, the outlet of which is connected to the low-temperature port of the cold storage device through a pipeline, and the inlet of which is connected to the high-temperature port of the cold storage device through a pipeline.

8. The cold energy storage, recovery and supply operation system according to claim 7, characterized in that: The pipeline between the outlet of the mobile cold-charging device and the low-temperature port of the cold storage device includes a first transition pipe and a first external pipe connected to each other, the free end of the first transition pipe is in communication with the low-temperature port of the cold storage device, the free end of the first external pipe is in communication with the outlet of the mobile cold-charging device, and the first transition pipe is in communication with the first external pipe via a quick-release connector; The pipeline between the inlet of the mobile cold charging device and the high-temperature port of the cold storage device includes a second transition pipe and a second external pipe, the free end of the second transition pipe is connected to the high-temperature port of the cold storage device, the free end of the second external pipe is connected to the inlet of the mobile cold charging device, and the second transition pipe is connected to the second external pipe via a quick-release connector.

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