Mixed liquid phase cold storage working medium, screening method, screening device and electronic equipment

Abstract

The invention relates to the technical field of liquid air energy storage, and discloses a mixed liquid phase cold storage working medium, a screening method, a screening device and electronic equipment. The screening method comprises the following steps: constructing a single liquid phase cold storage working medium database; and constructing a mixed liquid phase cold storage working medium database based on the single liquid phase cold storage working medium database. Wherein the single liquid phase cold storage working medium database comprises at least two non-combustible single liquid phase cold storage working media; the mixed liquid phase cold storage working medium database comprises at least one mixed liquid phase cold storage working medium, the mixed liquid phase cold storage working medium comprises at least two single liquid phase cold storage working mediums, and the freezing point of the mixed liquid phase cold storage working medium is lower than that of each single liquid phase cold storage working medium and is not greater than a second freezing point threshold value; the viscosity of the mixed liquid phase cold storage working medium is not greater than a second viscosity threshold value. By means of the screening method, the green and safe mixed liquid phase cold storage working medium suitable for the special environment temperature can be screened out, and the safety risk of a liquid air energy storage system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid air energy storage, and in particular to a mixed liquid phase cold storage medium, a screening method, a screening device and electronic equipment. Background Art

[0002] The randomness, volatility and instability of wind and solar resources have exacerbated the seasonal and periodic power shortages of renewable energy generation, bringing unprecedented challenges to the power system. In order to achieve peak load shaving and valley filling of renewable energy generation, stable and reliable large-scale long-term energy storage technology is urgently needed.

[0003] As one of the new large-scale long-term energy storage technologies, liquid air energy storage technology has the advantages of being clean, low-carbon, safe, long-life, high energy storage density, and not restricted by geographical conditions. It is one of the long-term energy storage technologies that my country focuses on developing. Compared with compressed air energy storage, liquid air energy storage introduces cold storage technology to liquefy air, and liquid air is stored in low-temperature storage tanks instead of underground salt caverns. This gives liquid air energy storage technology the outstanding advantages of high energy storage density and not being restricted by geographical conditions.

[0004] Cold storage technology is the core of liquid air energy storage technology. Current cold storage technologies mainly include liquid phase cold storage technology and solid phase cold storage technology. Among them, solid phase cold storage technology uses rocks, gravel, glass balls, etc. as cold storage media, which is safer and more economical. However, due to the development of the solid phase cold storage medium thermocline layer during the interval between storage and release, the system efficiency of solid phase cold storage technology is relatively low, and there are still certain problems in large-scale commercialization. Liquid phase cold storage technology has high efficiency, but the cold storage media used are mainly flammable and explosive chemicals such as methanol and propane. There is still a lack of green, low-carbon, and non-flammable liquid phase cold storage media, which makes the liquid air energy storage system have a high safety risk and limits its application scenarios. Summary of the invention

[0005] The present invention provides a mixed liquid phase cold storage medium, a screening method, a screening device and an electronic device, which are used to solve the problem that the existing liquid air energy storage technology based on liquid phase cold storage lacks a non-flammable and explosive liquid phase cold storage medium and has a high safety risk.

[0006] A first aspect of the present invention provides a mixed liquid phase cold storage working medium, wherein the mixed liquid phase cold storage working medium comprises at least two non-flammable single liquid phase cold storage working mediums; the boiling point of the single liquid phase cold storage working medium is not less than a boiling point threshold and the freezing point is not greater than a first freezing point threshold; the viscosity of the single liquid phase cold storage working medium is not greater than a first viscosity threshold; the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, the freezing point of the mixed liquid phase cold storage working medium is not greater than a second freezing point threshold, and the viscosity of the mixed liquid phase cold storage working medium is not greater than a second viscosity threshold; Wherein, both the first viscosity threshold and the second viscosity threshold are not greater than the rated viscosity of the delivery pump; and the second freezing point threshold is less than the first freezing point threshold.

[0007] A second aspect of the present invention provides a method for screening a mixed liquid phase cold storage medium, comprising: A single liquid phase cold storage medium database is constructed; wherein the single liquid phase cold storage medium database includes at least two non-flammable single liquid phase cold storage mediums, and the single liquid phase cold storage mediums meet a first cold storage requirement, and the first cold storage requirement includes: the single liquid phase cold storage medium is non-flammable; the boiling point of the single liquid phase cold storage medium is not less than a boiling point threshold and the freezing point is not greater than a first freezing point threshold; the viscosity of the single liquid phase cold storage medium is not greater than a first viscosity threshold; Based on the single liquid phase cold storage working medium database, a mixed liquid phase cold storage working medium database is constructed; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, the mixed liquid phase cold storage working medium includes at least two of the single liquid phase cold storage working mediums, and the mixed liquid phase cold storage working medium meets the second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, and is not greater than the second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than the second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; and the second freezing point threshold is less than the first freezing point threshold.

[0008] According to the screening method of mixed liquid-phase cold storage working fluid provided by the present invention, the construction of a single liquid-phase cold storage working fluid database comprises: Acquire the single liquid-phase cold storage working medium that meets the first cold storage requirement; Based on the single liquid-phase cold storage working medium, a single liquid-phase cold storage working medium database is constructed.

[0009] According to the method for screening a mixed liquid-phase cold storage medium provided by the present invention, the step of obtaining the single liquid-phase cold storage medium that meets the first cold storage requirement includes: Obtaining a non-combustible single liquid phase cold storage medium; When the single liquid-phase cold storage medium meets the requirement of being non-flammable, obtaining the single liquid-phase cold storage medium having a boiling point not less than a boiling point threshold and a freezing point not greater than a first freezing point threshold; When the single liquid-phase cold storage working medium satisfies the conditions that the boiling point is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold, the single liquid-phase cold storage working medium having a viscosity not greater than the first viscosity threshold is obtained.

[0010] According to the screening method of the mixed liquid phase cold storage medium provided by the present invention, the first cold storage requirement also includes: the ozone depletion potential of the single liquid phase cold storage medium is zero and the global warming potential meets the environmental protection requirements; After obtaining the single liquid-phase cold storage working medium having a viscosity not greater than a first viscosity threshold, the method further includes: When the viscosity of the single liquid-phase cold storage medium is not greater than a first viscosity threshold, the single liquid-phase cold storage medium with zero ozone depletion potential and a global warming potential that meets environmental protection requirements is obtained.

[0011] According to the screening method of the mixed liquid phase cold storage working medium provided by the present invention, the mixed liquid phase cold storage working medium database is constructed based on the single liquid phase cold storage working medium database, comprising: Acquire at least two of the single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids; In the case where the mixed liquid-phase cold storage working medium meets the second cold storage requirement, the mixed liquid-phase cold storage working medium database is constructed based on the mixed liquid-phase cold storage working medium.

[0012] According to the method for screening mixed liquid-phase cold storage working fluids provided by the present invention, the step of obtaining at least two of the single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids includes: Obtaining n types of the single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids; wherein n is a positive integer not less than 2; When n is not greater than n max In the case of, determining whether the mixed liquid phase cold storage medium meets the second cold storage requirement; wherein, n max It is the total number of the single liquid-phase cold storage working fluids contained in the single liquid-phase cold storage working fluid database.

[0013] According to the method for screening mixed liquid-phase cold storage working fluids provided by the present invention, after obtaining at least two of the single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids, the method further comprises: In the case that the mixed liquid-phase cold storage working medium does not meet the second cold storage requirement, return to obtain n types of the single liquid-phase cold storage working medium from the single liquid-phase cold storage working medium database, and assign n=n+1.

[0014] A third aspect of the present invention provides a screening device for a mixed liquid phase cold storage medium, using any of the above-mentioned screening methods for a mixed liquid phase cold storage medium, comprising: A first construction unit is used to construct a single liquid phase cold storage working medium database; wherein the single liquid phase cold storage working medium database includes at least two non-flammable single liquid phase cold storage working mediums, and the single liquid phase cold storage working mediums meet a first cold storage requirement, and the first cold storage requirement includes: the single liquid phase cold storage working medium is non-flammable; the boiling point of the single liquid phase cold storage working medium is not less than a boiling point threshold and the freezing point is not greater than a first freezing point threshold; the viscosity of the single liquid phase cold storage working medium is not greater than a first viscosity threshold; A second construction unit constructs a mixed liquid phase cold storage working medium database based on the single liquid phase cold storage working medium database; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, the mixed liquid phase cold storage working medium includes at least two of the single liquid phase cold storage working mediums, and the mixed liquid phase cold storage working medium meets a second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium and is not greater than a second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than a second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; and the second freezing point threshold is less than the first freezing point threshold.

[0015] A fourth aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, a method for screening a mixed liquid phase cold storage medium as described in any one of the above items is implemented.

[0016] The screening method of the mixed liquid phase cold storage working fluid provided by the present invention is to prepare the mixed liquid phase cold storage working fluid by mixing a non-flammable single liquid phase cold storage working fluid, and the mixed liquid phase cold storage working fluid has the property of being non-flammable. By limiting the freezing point of the mixed liquid phase cold storage working fluid to be lower than the freezing point of the single liquid phase cold storage working fluid, the cold storage capacity of the mixed liquid phase cold storage working fluid is ensured; the viscosity of the mixed liquid phase cold storage working fluid is limited to be lower than the second viscosity threshold, and the second viscosity threshold is lower than the rated viscosity of the delivery pump, so that the delivery pump can ensure that the delivery of the mixed liquid phase cold storage working fluid can be achieved, avoiding the problem of difficult delivery caused by the viscosity of the mixed liquid phase cold storage working fluid during the cooling process. Compared with the existing flammable liquid phase cold storage working fluid, the mixed liquid phase cold storage working fluid of the present invention is safer and more practical, and improves the safety of the liquid energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is one of the flow diagrams of the method for screening the mixed liquid phase cold storage medium provided by the present invention.

[0019] Figure 2 This is the second flow diagram of the method for screening the mixed liquid phase cold storage working medium provided by the present invention.

[0020] Figure 3 This is the third flow diagram of the method for screening the mixed liquid phase cold storage working medium provided by the present invention.

[0021] Figure 4 This is the fourth flow diagram of the method for screening the mixed liquid phase cold storage working medium provided by the present invention.

[0022] Figure 5 This is the fifth flow diagram of the method for screening the mixed liquid phase cold storage working medium provided by the present invention.

[0023] Figure 6 It is a structural schematic diagram of a screening device for mixed liquid phase cold storage working medium provided by the present invention.

[0024] Figure 7 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the embodiments of the present invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B may be singular or plural. In the textual description of the present invention, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship. In addition, it should be noted that the serial numbers themselves, such as "first", "second", etc., used to distinguish the objects described in the present invention are only used to distinguish the objects described, and do not have any order or technical meaning.

[0027] Cold storage technology is the core of liquid air energy storage technology. Current cold storage technologies mainly include liquid phase cold storage technology and solid phase cold storage technology. Among them, solid phase cold storage technology uses rocks, gravel, glass balls, etc. as cold storage media, which is safer and more economical. However, due to the development of the solid phase cold storage medium thermocline layer during the interval between storage and release, the system efficiency of solid phase cold storage technology is relatively low, and there are still certain problems in large-scale commercialization. For example, the 350kW / 2.5MWh liquid air energy storage project of Highview Company in the UK uses solid phase cold storage technology, with a cold storage efficiency of 51% and a round-trip efficiency of only 8%. The current liquid phase cold storage technology has a high cold storage efficiency, but there are environmental and safety issues. For example, China The 100kW / 100kWh liquid air energy storage project of the Institute of Physical and Chemical Technology of the Chinese Academy of Sciences uses trifluoroethylene dichloroethane and propane as cold storage media, with a cold storage efficiency of 90%. However, trifluoroethylene dichloroethane cannot be used on a large scale at this stage due to environmental restrictions. The largest liquid air energy storage demonstration project currently under construction, the 60MWW / 600MWh liquid air energy storage demonstration project in Qinghai Province, uses methanol and propane as cold storage media. The flammable and explosive properties of methanol and propane make the liquid air energy storage system have a high safety risk, which greatly limits its application scenarios. Finding a safe, stable and efficient liquid phase cold storage medium has become an urgent problem to be solved in the development of liquid air energy storage technology.

[0028] Combine the following Figures 1 to 7The mixed liquid phase cold storage working medium, screening method, screening device and electronic device of the present invention are described in detail. The execution subject of the screening method of the mixed liquid phase cold storage working medium is an electronic device or a server. The electronic device can be other devices such as a personal computer (PC), a portable device, a laptop, a smart phone, a tablet computer and a portable wearable device; the server can refer to a single server, or a server cluster composed of multiple servers, a cloud server, etc. The present invention does not specifically limit the specific form of the electronic device or the server. Furthermore, the screening method of the mixed liquid phase cold storage working medium can also be applied to a screening device of a mixed liquid phase cold storage working medium arranged in an electronic device or a server, and the screening device of the mixed liquid phase cold storage working medium can be implemented by software, hardware or a combination of the two. The screening method of the mixed liquid phase cold storage working medium is described below by taking the screening device of the mixed liquid phase cold storage working medium as an example in which the execution subject of the screening method of the mixed liquid phase cold storage working medium is a screening device of the mixed liquid phase cold storage working medium.

[0029] In order to facilitate understanding of the screening method of the mixed liquid phase cold storage medium provided by the embodiment of the present invention, the screening method of the mixed liquid phase cold storage medium provided by the present invention will be described in detail below through the following exemplary embodiments. It can be understood that the following exemplary embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0030] A specific embodiment of the first aspect of the present invention provides a mixed liquid phase cold storage working medium, the mixed liquid phase cold storage working medium includes at least two non-flammable single liquid phase cold storage working mediums; the boiling point of the single liquid phase cold storage working medium is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; the viscosity of the single liquid phase cold storage working medium is not greater than the first viscosity threshold; the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, the freezing point of the mixed liquid phase cold storage working medium is not greater than the second freezing point threshold, and the viscosity of the mixed liquid phase cold storage working medium is not greater than the second viscosity threshold; Among them, the first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; and the second freezing point threshold is less than the first freezing point threshold.

[0031] In this embodiment, a mixed liquid-phase cold storage working fluid is prepared by mixing a non-flammable single liquid-phase cold storage working fluid, and the mixed liquid-phase cold storage working fluid has a non-flammable property. By limiting the freezing point of the mixed liquid-phase cold storage working fluid to be lower than the freezing point of the single liquid-phase cold storage working fluid, the cold storage capacity of the mixed liquid-phase cold storage working fluid is ensured; the viscosity of the mixed liquid-phase cold storage working fluid is limited to be lower than the second viscosity threshold, and the second viscosity threshold is lower than the rated viscosity of the delivery pump, so that the delivery pump can ensure that the mixed liquid-phase cold storage working fluid can be delivered, avoiding the problem of difficult delivery caused by the viscosity of the mixed liquid-phase cold storage working fluid during the cooling process. Compared with the existing flammable liquid-phase cold storage working fluid, the mixed liquid-phase cold storage working fluid of the present invention is safer and more practical, and improves the safety of the liquid energy storage system.

[0032] Furthermore, the single liquid phase cold storage medium includes but is not limited to refrigerant R227ea, refrigerant R152a, refrigerant R143a or dichloromethane.

[0033] It can be understood that the non-combustible single liquid phase cold storage medium refers to a liquid medium that can be used for cold storage while not burning. Non-combustible liquids are liquids that are not flammable or not likely to cause fire. Under normal conditions, such liquids will not undergo violent chemical reactions with oxygen in the air, thereby releasing a large amount of heat and light (i.e., combustion).

[0034] It should be noted that, in different application scenarios, there is a corresponding boiling point threshold, a corresponding first freezing point threshold and a corresponding second freezing point threshold.

[0035] Exemplarily, in a liquid energy storage system, in other words, when a mixed liquid phase cold storage medium is applied to a liquid energy storage system, the boiling point threshold may be -50°C, the first freezing point threshold may be -100°C, and the second freezing point threshold may be -150°C.

[0036] It should be noted that the first viscosity threshold and the second viscosity threshold may be equal or unequal, but neither is greater than the rated viscosity of the delivery pump. Specifically, the first viscosity threshold and the second viscosity threshold may both be 200 mm 2 / s.

[0037] In some embodiments, the ozone depletion potential of a single liquid phase cold storage medium is zero and the global warming potential meets environmental protection requirements. By limiting the ozone depletion potential of a single liquid phase cold storage medium to zero and the global warming potential meets environmental protection requirements, it is possible to ensure that the mixed liquid phase cold storage medium is green and low-carbon.

[0038] like Figure 1 As shown, a specific embodiment of the second aspect of the present invention provides a method for screening a mixed liquid phase cold storage medium. The method for screening a mixed liquid phase cold storage medium comprises: S100, constructing a single liquid phase cold storage working medium database; wherein the single liquid phase cold storage working medium database includes at least two non-flammable single liquid phase cold storage working mediums; the single liquid phase cold storage working medium meets the first cold storage requirement, and the first cold storage requirement includes: the single liquid phase cold storage working medium is non-flammable; the boiling point of the single liquid phase cold storage working medium is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; the viscosity of the single liquid phase cold storage working medium is not greater than the first viscosity threshold; S200, constructing a mixed liquid phase cold storage working medium database based on a single liquid phase cold storage working medium database; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, and the mixed liquid phase cold storage working medium includes at least two single liquid phase cold storage working mediums; the mixed liquid phase cold storage working medium meets a second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, and is not greater than a second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than a second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; the second freezing point threshold is less than the first freezing point threshold.

[0039] In this embodiment, the screening method of the mixed liquid-phase cold storage working fluid is based on the principle that the colligative properties of the solution lead to a decrease in the freezing point of the mixed working fluid. First, a single liquid-phase cold storage working fluid database whose boiling point, freezing point and viscosity meet certain requirements is constructed; then, a mixed liquid-phase cold storage working fluid database is constructed based on the single liquid-phase cold storage working fluid database. In this way, safe and reliable mixed liquid-phase cold storage working fluids suitable for liquid-phase cold storage systems can be screened out, thereby reducing the safety risks of liquid-phase cold storage systems.

[0040] Specifically, first, the screening device for mixed liquid-phase cold storage working fluids constructs a single liquid-phase cold storage working fluid database; wherein the single liquid-phase cold storage working fluid database includes at least two non-combustible single liquid-phase cold storage working fluids, and the single liquid-phase cold storage working fluids meet the first cold storage requirement. Then, the screening device for mixed liquid-phase cold storage working fluids constructs a mixed liquid-phase cold storage working fluid database based on the single liquid-phase cold storage working fluid database; wherein the mixed liquid-phase cold storage working fluid database includes at least one mixed liquid-phase cold storage working fluid, the mixed liquid-phase cold storage working fluid includes at least two single liquid-phase cold storage working fluids, and the mixed liquid-phase cold storage working fluids meet the second cold storage requirement.

[0041] Exemplarily, in a liquid energy storage system, in other words, when a mixed liquid phase cold storage medium is applied to a liquid energy storage system, the boiling point threshold may be -50°C, the first freezing point threshold may be -100°C, and the second freezing point threshold may be -150°C.

[0042] It should be noted that the first viscosity threshold and the second viscosity threshold may be equal or unequal, but neither is greater than the rated viscosity of the delivery pump. Specifically, the first viscosity threshold and the second viscosity threshold may both be 200 mm2 / s.

[0043] By limiting the boiling point and freezing point of a single liquid phase cold storage medium and limiting the freezing point of a mixed liquid phase cold storage medium, the mixed liquid phase cold storage medium can be made suitable for use in a deep low temperature environment.

[0044] like Figure 2 As shown, in some embodiments, S100, constructing a single liquid phase cold storage medium database, includes: S110, obtaining a single liquid phase cold storage working medium that meets a first cold storage requirement; S120. Based on the single liquid phase cold storage working fluid, construct a single liquid phase cold storage working fluid database.

[0045] Specifically, first, the screening device of the mixed liquid phase cold storage working medium obtains a single liquid phase cold storage working medium that meets the first cold storage requirement; then, the single liquid phase cold storage working medium of the first cold storage requirement is based on the single liquid phase cold storage working medium to construct a single liquid phase cold storage working medium database. The single liquid phase cold storage working medium that does not meet the first cold storage requirement can be discarded, providing a basis for the subsequent establishment of a mixed liquid phase cold storage working medium database.

[0046] like Figure 3 As shown, further, S110, obtaining the single liquid-phase cold storage working medium that meets the first cold storage requirement, includes: S111. Obtaining a non-combustible single liquid phase cold storage medium; S112, when the single liquid phase cold storage working medium meets the requirement of being non-flammable, obtaining a single liquid phase cold storage working medium having a boiling point not less than a boiling point threshold and a freezing point not greater than a first freezing point threshold; S113. When the single liquid-phase cold storage working medium satisfies the conditions that the boiling point is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold, obtain a single liquid-phase cold storage working medium having a viscosity not greater than the first viscosity threshold.

[0047] like Figure 3 As shown, further, the first cold storage requirement also includes: the ozone depletion potential of the single liquid phase cold storage medium is zero and the global warming potential meets the environmental protection requirements; After obtaining a single liquid phase cold storage working medium with a viscosity not greater than a first viscosity threshold, the method further includes: S114. When the viscosity of the single liquid-phase cold storage medium is not greater than a first viscosity threshold, obtain a single liquid-phase cold storage medium with zero ozone depletion potential and a global warming potential that meets environmental protection requirements.

[0048] like Figure 4 and Figure 5 As shown, specifically, obtaining a single liquid phase cold storage medium that meets the first cold storage requirement includes: Step 1: The screening device for the mixed liquid phase cold storage medium obtains a non-combustible single liquid phase cold storage medium; Step 2: The screening device for the mixed liquid phase cold storage medium determines whether the boiling point and freezing point of the non-combustible single liquid phase cold storage medium meet the following conditions: the boiling point is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; if yes, proceed to step 3; if no, return to step 1; Step 3: The screening device for the mixed liquid phase cold storage medium determines whether the viscosity of the non-combustible single liquid phase cold storage medium having a boiling point not less than a boiling point threshold and a freezing point not greater than a first freezing point threshold is not greater than a first viscosity threshold; if so, proceed to step 4; if not, return to step 1; Step 4, the screening device for the mixed liquid-phase cold storage working fluid determines whether the ozone depletion potential of the single liquid-phase cold storage working fluid with a boiling point not less than the boiling point threshold and a freezing point not greater than the first freezing point threshold, which is non-flammable and has a viscosity not greater than the first viscosity threshold is zero and whether the global warming potential meets the environmental protection requirements; if so, proceed to S120, that is, construct a single liquid-phase cold storage working fluid database based on the screened single liquid-phase cold storage working fluid; if not, return to step 1.

[0049] In this embodiment, non-flammable liquid-phase cold storage working fluids are first screened out, and combustible liquid-phase cold storage working fluids are discharged to prevent flammable and explosive chemicals such as methanol and propane from being used as liquid-phase cold storage working fluids, thereby improving safety of use. Then, liquid-phase cold storage working fluids that meet special needs are screened out by boiling point and freezing point, which can ensure the cold storage effect while ensuring that they will not solidify when the temperature is lowered. Next, viscous cold storage working fluids are screened out by viscosity to ensure that the delivery pump can smoothly deliver the liquid-phase cold storage working fluid. Finally, green and pollution-free liquid-phase cold storage working fluids are screened out by ozone depletion potential and global warming potential.

[0050] It should be noted that for the four first cold storage requirements, the four first cold storage requirements are: the single liquid phase cold storage working fluid cannot be burned; the boiling point of the single liquid phase cold storage working fluid is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; the viscosity of the single liquid phase cold storage working fluid is not greater than the first viscosity threshold; the ozone depletion potential of the single liquid phase cold storage working fluid is zero and the global warming potential meets the environmental protection requirements. These four cold storage requirements need to be met at the same time to be used as a single liquid phase cold storage working fluid in the single liquid phase cold storage working fluid database. In addition, when judging whether the liquid cold storage working fluid meets the above four first cold storage requirements, it can be judged at the same time whether the liquid cold storage working fluid meets the above four first cold storage requirements, or it can be judged in order of priority. Preferably, it can be judged in order of priority whether the liquid cold storage working fluid meets the above four first cold storage requirements.

[0051] like Figure 2As shown, in some embodiments, S200, based on a single liquid phase cold storage working medium database, constructing the mixed liquid phase cold storage working medium database includes: S210, obtaining at least two single liquid-phase cold storage working fluids from a single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids; S220: When the mixed liquid-phase cold storage working medium meets the second cold storage requirement, a mixed liquid-phase cold storage working medium database is constructed based on the mixed liquid-phase cold storage working medium.

[0052] like Figure 4 As shown, specifically, first, the screening device for mixed liquid-phase cold storage working fluid obtains at least two single liquid-phase cold storage working fluids from a single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids; then, the screening device for mixed liquid-phase cold storage working fluids determines whether the mixed liquid-phase cold storage working fluid meets the second cold storage requirement; when the mixed liquid-phase cold storage working fluid meets the second cold storage requirement, the screening device for mixed liquid-phase cold storage working fluids constructs a mixed liquid-phase cold storage working fluid database based on the mixed liquid-phase cold storage working fluid.

[0053] like Figure 5 As shown, further, when the mixed liquid phase cold storage working medium meets the second cold storage requirement, a mixed liquid phase cold storage working medium database is constructed based on the mixed liquid phase cold storage working medium, including: When the freezing point of the mixed liquid phase cold storage medium is lower than the freezing point of the single liquid phase cold storage medium and is not greater than the second freezing point threshold, obtaining the mixed liquid phase cold storage medium having a viscosity not greater than the second viscosity threshold; A mixed liquid phase cold storage working fluid database is constructed based on the mixed liquid phase cold storage working fluid whose viscosity is not greater than a second viscosity threshold.

[0054] It should be noted that for the two second cold storage requirements, the two second cold storage requirements are: the freezing point of the premixed cold storage working fluid is less than the freezing point of the single liquid phase cold storage working fluid, and is not greater than the second freezing point threshold; the viscosity of the premixed cold storage working fluid is not greater than the second viscosity threshold. These two cold storage requirements need to be met at the same time before the premixed cold storage working fluid can be used as a mixed liquid phase cold storage working fluid in the mixed liquid phase cold storage working fluid database. In addition, when judging whether the premixed cold storage working fluid meets the above two second cold storage requirements, it can be judged at the same time whether the premixed cold storage working fluid meets the above two second cold storage requirements, or it can be judged in order of priority. Preferably, it can be judged in order of priority whether the premixed cold storage working fluid meets the above two second cold storage requirements.

[0055] like Figure 4 As shown, further, S210, obtaining at least two of the single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids, including: Obtain n single liquid phase cold storage working fluids from a single liquid phase cold storage working fluid database as mixed liquid phase cold storage working fluids; wherein n is a positive integer not less than 2; When n is not greater than n max In the case of , determine whether the mixed liquid phase cold storage medium meets the second cold storage requirement; where n max is the total number of single liquid phase cold storage working fluids contained in the single liquid phase cold storage working fluid database; When n is greater than n max In the case of , all mixed liquid phase cold storage working fluids in the mixed liquid phase cold storage working fluid database are output.

[0056] like Figure 4 As shown, further, after obtaining at least two of the single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as the mixed liquid-phase cold storage working fluid, it also includes: When the mixed liquid-phase cold storage medium does not meet the second cold storage requirement, return to obtain n single liquid-phase cold storage mediums from the single liquid-phase cold storage medium database, and assign n=n+1.

[0057] The screening method of this embodiment can screen out all mixed liquid-phase cold storage working fluids that meet the second cold storage requirement based on the single liquid-phase cold storage working fluid database.

[0058] like Figure 4 Specifically, based on the single liquid phase cold storage working medium database, a mixed liquid phase cold storage working medium database is constructed, including: Step 6: The screening device obtains n single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids; n is a positive integer not less than 2; Step 7: The screening device determines whether n satisfies: n≤n max ; If yes, proceed to step 8; if no, the screening device outputs all mixed liquid phase cold storage working fluids in the mixed liquid phase cold storage working fluid database; Step 8, the screening device determines whether the freezing point of the mixed liquid phase cold storage medium satisfies: the freezing point of the mixed liquid phase cold storage medium is less than the freezing point of the single liquid phase cold storage medium, and is not greater than the second freezing point threshold; if so, proceed to step 9; if not, return to step 6, and assign n=n+1; Step 9, the screening device determines whether the viscosity of the mixed liquid phase cold storage working fluid is not greater than the second viscosity threshold. If so, the screening device constructs a mixed liquid phase cold storage working fluid database based on the screened mixed liquid phase cold storage working fluid; if not, return to step 6 and assign n=n+1.

[0059] Through the screening method of this embodiment, all mixed liquid-phase cold storage working fluids that meet the second cold storage requirement can be screened out based on the single liquid-phase cold storage working fluid database.

[0060] In some embodiments, when the mixed liquid phase cold storage working medium meets the second cold storage requirement, before constructing the mixed liquid phase cold storage working medium database based on the mixed liquid phase cold storage working medium, the method further includes: Based on chemical simulation software, the freezing point of the mixed liquid phase cold storage medium is determined.

[0061] Further, the chemical simulation software includes Aspen HYSYS software.

[0062] In this embodiment, the freezing point of the premixed cold storage medium is determined by chemical simulation software, compared with the calculation formula of the freezing point of the mixed medium in the colligative principle of the solution: ΔT f =K f b B (ΔT f Indicates the freezing point depression value, K f represents the freezing point depression constant, b B Indicates the mass molar concentration of the solute), the calculation is more accurate and reliable.

[0063] Further, the viscosity of the premixed cold storage medium is determined by chemical simulation software. Specifically, the viscosity of the premixed cold storage medium is determined by AspenHYSYS software. Specifically, a suitable physical property method is selected according to the system. For example, the RK-Soave method is selected for non-polar systems, the Wilson method is selected for mixed polar systems, and the NRTL method is selected for polar systems.

[0064] It should be noted that Aspen HYSYS software belongs to the prior art and will not be described in detail here.

[0065] In summary, the advantages of this embodiment are: (1) The screening method of the mixed liquid phase cold storage working fluid described in this embodiment constructs a safe, environmentally friendly and applicable single liquid phase cold storage working fluid database, and on this basis establishes a mixed working fluid screening method, which can comprehensively and systematically screen mixed liquid working fluids suitable for the deep low temperature zone required by the liquid air energy storage system; (2) The screening method described in this embodiment is based on a database constructed based on a non-flammable single working fluid, which is safer and more practical than the method of mixing a combustible working fluid with a non-flammable working fluid; (3) The screening method described in this embodiment is more comprehensive and systematic than the current random screening method or the screening method based on the characteristics of some functional groups; (4) The deep low temperature non-explosive mixed liquid phase cold storage working fluid obtained by screening will promote the large-scale application of safe and efficient liquid air energy storage technology, and significantly broaden the application scenarios of liquid air energy storage systems.

[0066] like Figure 6 As shown, the third aspect of the present invention provides a screening device for mixed liquid phase cold storage medium. The screening device for mixed liquid phase cold storage medium comprises a first building unit and a second building unit.

[0067] Among them, the first construction unit is used to construct a single liquid-phase cold storage working fluid database; wherein the single liquid-phase cold storage working fluid database includes at least two non-combustible single liquid-phase cold storage working fluids, and the single liquid-phase cold storage working fluids meet the first cold storage requirement, and the first cold storage requirement includes: the single liquid-phase cold storage working fluid is non-combustible; the boiling point of the single liquid-phase cold storage working fluid is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; the viscosity of the single liquid-phase cold storage working fluid is not greater than the first viscosity threshold.

[0068] The second construction unit is used to construct a mixed liquid phase cold storage working medium database based on the single liquid phase cold storage working medium database; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, the mixed liquid phase cold storage working medium includes at least two of the single liquid phase cold storage working mediums, and the mixed liquid phase cold storage working medium meets the second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, and is not greater than the second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than the second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; and the second freezing point threshold is less than the first freezing point threshold.

[0069] Figure 7 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 7 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the screening method of the mixed liquid phase cold storage working medium, and the method includes: S100, S100, construct a single liquid phase cold storage working medium database; wherein the single liquid phase cold storage working medium database includes at least two non-flammable single liquid phase cold storage working mediums; the single liquid phase cold storage working medium meets the first cold storage requirement, and the first cold storage requirement includes: the single liquid phase cold storage working medium is non-flammable; the boiling point of the single liquid phase cold storage working medium is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; the viscosity of the single liquid phase cold storage working medium is not greater than the first viscosity threshold; S200, constructing a mixed liquid phase cold storage working medium database based on a single liquid phase cold storage working medium database; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, and the mixed liquid phase cold storage working medium includes at least two single liquid phase cold storage working mediums; the mixed liquid phase cold storage working medium meets a second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, and is not greater than a second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than a second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; the second freezing point threshold is less than the first freezing point threshold.

[0070] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0071] On the other hand, the present invention further provides a computer program product, the computer program product comprising a computer program, the computer program can be stored in a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer can execute the method for screening the mixed liquid phase cold storage working medium provided by the above methods, the method comprising: S100, constructing a single liquid phase cold storage working medium database; wherein the single liquid phase cold storage working medium database includes at least two non-flammable single liquid phase cold storage working mediums; the single liquid phase cold storage working medium meets the first cold storage requirement, and the first cold storage requirement includes: the single liquid phase cold storage working medium is non-flammable; the boiling point of the single liquid phase cold storage working medium is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; the viscosity of the single liquid phase cold storage working medium is not greater than the first viscosity threshold; S200, constructing a mixed liquid phase cold storage working medium database based on a single liquid phase cold storage working medium database; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, and the mixed liquid phase cold storage working medium includes at least two single liquid phase cold storage working mediums; the mixed liquid phase cold storage working medium meets a second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, and is not greater than a second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than a second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; the second freezing point threshold is less than the first freezing point threshold.

[0072] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to perform the method for screening the mixed liquid phase cold storage working medium provided by the above methods, the method comprising: S100, constructing a single liquid phase cold storage working medium database; wherein the single liquid phase cold storage working medium database includes at least two non-flammable single liquid phase cold storage working mediums; the single liquid phase cold storage working medium meets the first cold storage requirement, and the first cold storage requirement includes: the single liquid phase cold storage working medium is non-flammable; the boiling point of the single liquid phase cold storage working medium is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; the viscosity of the single liquid phase cold storage working medium is not greater than the first viscosity threshold; S200, constructing a mixed liquid phase cold storage working medium database based on a single liquid phase cold storage working medium database; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, and the mixed liquid phase cold storage working medium includes at least two single liquid phase cold storage working mediums; the mixed liquid phase cold storage working medium meets a second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, and is not greater than a second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than a second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; the second freezing point threshold is less than the first freezing point threshold.

[0073] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0074] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mixed liquid phase cold storage medium, characterized in that: The mixed liquid phase cold storage medium includes at least two non-combustible single liquid phase cold storage mediums; the boiling point of the single liquid phase cold storage medium is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold; The viscosity of the single liquid phase cold storage medium is not greater than a first viscosity threshold; the freezing point of the mixed liquid phase cold storage medium is lower than the freezing point of the single liquid phase cold storage medium, the freezing point of the mixed liquid phase cold storage medium is not greater than a second freezing point threshold, and the viscosity of the mixed liquid phase cold storage medium is not greater than a second viscosity threshold; Wherein, both the first viscosity threshold and the second viscosity threshold are not greater than the rated viscosity of the delivery pump; and the second freezing point threshold is less than the first freezing point threshold.

2. A method for screening mixed liquid phase cold storage medium, characterized in that: include: A single liquid phase cold storage medium database is constructed; wherein the single liquid phase cold storage medium database includes at least two non-flammable single liquid phase cold storage mediums, and the single liquid phase cold storage mediums meet a first cold storage requirement, and the first cold storage requirement includes: the single liquid phase cold storage medium is non-flammable; the boiling point of the single liquid phase cold storage medium is not less than a boiling point threshold and the freezing point is not greater than a first freezing point threshold; the viscosity of the single liquid phase cold storage medium is not greater than a first viscosity threshold; Based on the single liquid phase cold storage working medium database, a mixed liquid phase cold storage working medium database is constructed; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, the mixed liquid phase cold storage working medium includes at least two of the single liquid phase cold storage working mediums, and the mixed liquid phase cold storage working medium meets the second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium, and is not greater than the second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than the second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; and the second freezing point threshold is less than the first freezing point threshold.

3. The method for screening mixed liquid phase cold storage medium according to claim 2, characterized in that: The construction of a single liquid phase cold storage medium database comprises: Acquire the single liquid-phase cold storage working medium that meets the first cold storage requirement; Based on the single liquid-phase cold storage working medium, a single liquid-phase cold storage working medium database is constructed.

4. The method for screening mixed liquid phase cold storage medium according to claim 3, characterized in that: The obtaining of the single liquid-phase cold storage medium that meets the first cold storage requirement includes: Obtaining a non-combustible single liquid phase cold storage medium; When the single liquid-phase cold storage medium meets the requirement of being non-flammable, obtaining the single liquid-phase cold storage medium having a boiling point not less than a boiling point threshold and a freezing point not greater than a first freezing point threshold; When the single liquid-phase cold storage working medium satisfies the conditions that the boiling point is not less than the boiling point threshold and the freezing point is not greater than the first freezing point threshold, the single liquid-phase cold storage working medium having a viscosity not greater than the first viscosity threshold is obtained.

5. The method for screening mixed liquid phase cold storage medium according to claim 4, characterized in that: The first cold storage requirement also includes: the ozone depletion potential of the single liquid phase cold storage medium is zero and the global warming potential meets environmental protection requirements; After obtaining the single liquid-phase cold storage working medium having a viscosity not greater than a first viscosity threshold, the method further includes: When the viscosity of the single liquid-phase cold storage medium is not greater than a first viscosity threshold, the single liquid-phase cold storage medium with zero ozone depletion potential and a global warming potential that meets environmental protection requirements is obtained.

6. The method for screening mixed liquid phase cold storage medium according to any one of claims 2 to 5, characterized in that: The method of constructing the mixed liquid-phase cold storage working medium database based on the single liquid-phase cold storage working medium database includes: Acquire at least two of the single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids; In the case where the mixed liquid-phase cold storage working medium meets the second cold storage requirement, the mixed liquid-phase cold storage working medium database is constructed based on the mixed liquid-phase cold storage working medium.

7. The method for screening mixed liquid phase cold storage medium according to claim 6, characterized in that: The step of obtaining at least two of the single liquid-phase cold storage working media from the single liquid-phase cold storage working media database as mixed liquid-phase cold storage working media includes: Obtaining n types of the single liquid-phase cold storage working fluids from the single liquid-phase cold storage working fluid database as mixed liquid-phase cold storage working fluids; wherein n is a positive integer not less than 2; When n is not greater than n max In the case of, determining whether the mixed liquid phase cold storage medium meets the second cold storage requirement; wherein, n max It is the total number of the single liquid-phase cold storage working fluids contained in the single liquid-phase cold storage working fluid database.

8. The method for screening mixed liquid phase cold storage medium according to claim 7, characterized in that: After obtaining at least two of the single liquid-phase cold storage working media from the single liquid-phase cold storage working media database as mixed liquid-phase cold storage working media, the method further includes: In the case that the mixed liquid-phase cold storage working medium does not meet the second cold storage requirement, return to obtain n types of the single liquid-phase cold storage working medium from the single liquid-phase cold storage working medium database, and assign n=n+1.

9. A screening device for mixed liquid phase cold storage medium, characterized in that: The method for screening the mixed liquid phase cold storage medium according to any one of claims 2 to 8 comprises: A first construction unit is used to construct a single liquid phase cold storage working medium database; wherein the single liquid phase cold storage working medium database includes at least two non-flammable single liquid phase cold storage working mediums, and the single liquid phase cold storage working mediums meet a first cold storage requirement, and the first cold storage requirement includes: the single liquid phase cold storage working medium is non-flammable; the boiling point of the single liquid phase cold storage working medium is not less than a boiling point threshold and the freezing point is not greater than a first freezing point threshold; the viscosity of the single liquid phase cold storage working medium is not greater than a first viscosity threshold; A second construction unit constructs a mixed liquid phase cold storage working medium database based on the single liquid phase cold storage working medium database; wherein the mixed liquid phase cold storage working medium database includes at least one mixed liquid phase cold storage working medium, the mixed liquid phase cold storage working medium includes at least two of the single liquid phase cold storage working mediums, and the mixed liquid phase cold storage working medium meets a second cold storage requirement, and the second cold storage requirement includes: the freezing point of the mixed liquid phase cold storage working medium is lower than the freezing point of the single liquid phase cold storage working medium and is not greater than a second freezing point threshold; the viscosity of the mixed liquid phase cold storage working medium is not greater than a second viscosity threshold; The first viscosity threshold and the second viscosity threshold are both not greater than the rated viscosity of the delivery pump; and the second freezing point threshold is less than the first freezing point threshold.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for screening the mixed liquid-phase cold storage working medium as described in any one of claims 2 to 8 is implemented.

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