CN112877038A - Chloride-based molten salt heat transfer and storage medium and preparation method and application thereof - Google Patents

Chloride-based molten salt heat transfer and storage medium and preparation method and application thereof Download PDF

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CN112877038A
CN112877038A CN202110040416.6A CN202110040416A CN112877038A CN 112877038 A CN112877038 A CN 112877038A CN 202110040416 A CN202110040416 A CN 202110040416A CN 112877038 A CN112877038 A CN 112877038A
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molten salt
chloride
heat transfer
storage medium
temperature
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袁建伟
潘莹
朱闯
陈留平
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China Salt Jintan Co Ltd
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China Salt Jintan Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08—Materials not undergoing a change of physical state when used
    • C09K5/10—Liquid materials
    • C09K5/12—Molten materials, i.e. materials solid at room temperature, e.g. metals or salts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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Abstract

The invention provides a chloride molten salt heat transfer and storage medium which comprises the following components in percentage by mass: 10% -30% of NaCl; KCl 10-30%; ZnCl250 to 80 percent. The chloride system molten salt heat transfer and storage medium can reduce the melting point of molten salt, improve the use upper limit temperature, and meet the use requirement of a compressed air energy storage system, thereby being beneficial to the application of the chloride system molten salt heat transfer and storage medium in the compressed air energy storage system and solar power generation; the preparation method of the chloride molten salt heat transfer and storage medium has the advantages of strong universality, good use effect, simple and convenient operation and convenient implementation.

Description

Chloride-based molten salt heat transfer and storage medium and preparation method and application thereof
Technical Field
The invention relates to the technical field of energy storage, in particular to a chloride system molten salt heat transfer and storage medium and a preparation method and application thereof.
Background
China is a country with large energy consumption, the development of economy is gradually restricted by energy problems, and the vigorous development of new energy and renewable resources is an important measure for ensuring the sustainable development of the economy of China. The demand of power grid allocation by developing an energy storage technology is urgent, and heat is transferred and storedThe system is an important component of energy storage technology, the quality of the properties of high-temperature and low-temperature heat transfer and storage materials running in the heat transfer and storage system directly influences the efficiency and the cost of a power generation system, molten Salt is widely applied and has been successfully used in various heat transfer and storage media by the advantages of low steam pressure, wide use temperature range, small viscosity, good stability and the like, Solar Salt and Hitec Salt are commonly used at home and abroad, but the use temperature of nitrate is narrow, and a series of nitrogen oxides NO can be generated in the heat transfer and storage processXAnd the atmospheric environment is influenced, so that a novel fused salt heat storage and heat storage material needs to be developed.
The chloride fused salt has the advantages of wide source, low cost, large phase change latent heat, wide working temperature range, large heat storage density and the like, has good application prospect as a heat storage and heat storage medium, has become a hotspot of research of scholars at home and abroad in recent years, is a middle-salt gold altar salinization finite responsibility company as an first-class salt manufacturing enterprise, has rich chloride resources, and simultaneously is developed in Jiangsu Changzhou gold altar based on a salt cavern compressed air intelligent power grid energy storage system project to contribute to the construction of a large-scale clean physical energy storage base in China. The development of the projects accumulates a great deal of theoretical and practical foundations for the development of diversified development of the salt cavern gas storage and energy storage. Therefore, on the basis of reality, the fused salt is applied to a compressed air energy storage project, and the heat stored in the fused salt is used for heating the high-pressure air to drive the turbine to generate electricity, so that the afterburning of fuel is abandoned, the compression heat is efficiently recovered, and the non-combustion and non-emission in the system operation process are realized.
At present, the research on molten Salt is mostly concentrated in the field of Solar heat storage power generation, the application of the molten Salt in the compressed air energy storage project is less, the research on chloride molten Salt has good development prospect, the application range of the nitrate molten Salt is still wider at present, and the most used heat storage and heat storage material is mainly Solar Salt (60% KNO)3+40％NaNO3) And Hitech (53% KNO)3+7％NaNO3+40％NaNO2) The temperature ranges of 220-600 ℃ and 142-535 ℃ are successfully applied to business, but have the defects: high melting point, easy solidification and easy pipeline blockage, NaCl-CaCl proposed by Chinese patent CN 103160247A2The system has a melting point of over 500 ℃ and is easy to solidify, the heat preservation energy consumption of the system can be increased in practical application, and the Xu X K and the like research KCl-MgCl2And NaCl-KCl-MgCl2Two systems of molten salts, wherein KCl-MgCl2The system molten salt is unstable in the operation process and is not beneficial to the actual production requirement, so that the melting point is reduced, the use upper limit temperature is increased, the thermal physical property stability is kept, and the virtual high-performance chloride system molten salt is extremely promising.
Disclosure of Invention
The invention aims to overcome and supplement the defects in the prior art and provide a chloride system molten salt heat transfer and storage medium, a preparation method and application thereof. The technical scheme adopted by the invention is as follows:
a chloride-based molten salt heat transfer and storage medium, wherein: the composite material comprises the following components in percentage by mass:
NaCl 10％-30％；
KCl 10％-30％；
ZnCl 2 50％-80％。
preferably, the chloride is a molten salt heat transfer and storage medium, wherein: the composite material comprises the following components in percentage by mass:
NaCl 15％-30％；
KCl 15％-25％；
ZnCl2 55％-75％。
a method for preparing a chloride-based molten salt heat transfer and storage medium, wherein: the method comprises the following steps:
s1, mixing NaCl, KCl and ZnCl2Mixing the raw materials according to the proportion to obtain a mixture;
s2, grinding the mixture to obtain mixture powder;
s3, heating the mixed powder obtained in the step S2 to be molten, and then performing heat preservation and cooling to obtain a product.
Preferably, the method for preparing the chloride molten salt heat transfer and storage medium comprises the following steps: the step S2 includes the steps of:
s21, putting the mixture obtained in the step S1 into a mortar and uniformly stirring;
s22, grinding the mixture evenly stirred in the step S21 until no particles exist.
Preferably, the method for preparing the chloride molten salt heat transfer and storage medium comprises the following steps: the step S3 further includes grinding the cooled powder into powder.
Preferably, the method for preparing the chloride molten salt heat transfer and storage medium comprises the following steps: the heating temperature of the step S3 is 400-450 ℃, and the heat preservation time is 2-3 h.
A chloride-based molten salt heat transfer and storage medium is applied to industrial energy storage and solar power generation.
The application of the chloride-based molten salt heat transfer and storage medium in industrial energy storage and solar power generation, wherein the industrial energy storage is a compressed air energy storage system, and the compressed air energy storage system comprises:
a gas storage chamber in which high pressure gas can be stored;
the low-temperature molten salt tank is internally provided with a low-temperature molten salt accommodating cavity, and molten salt can be stored in the low-temperature molten salt accommodating cavity;
the high-temperature molten salt tank is internally provided with a high-temperature molten salt accommodating cavity, molten salt can be stored in the high-temperature molten salt accommodating cavity, and the high-temperature molten salt accommodating cavity is communicated with the low-temperature molten salt accommodating cavity;
the molten salt electric heater is connected with the low-temperature molten salt tank;
and the turbine assembly is respectively connected with the air storage chamber and the high-temperature molten salt tank, and the high-pressure gas is expanded to generate power to release energy after being released from the air storage chamber.
The application of the chloride-based molten salt heat transfer and storage medium in industrial energy storage and solar power generation is realized, wherein the molten salt in the high-temperature molten salt tank and/or the low-temperature molten salt tank is the chloride-based molten salt heat transfer and storage medium.
The utility model provides an application in industrial energy storage and solar energy power generation of chloride system fused salt heat transfer heat storage medium, wherein, the turbine subassembly includes first stage turbine, second stage turbine.
The invention has the advantages that: the chloride system molten salt heat transfer and storage medium can reduce the melting point of molten salt, improve the use upper limit temperature, and meet the use requirement of a compressed air energy storage system, thereby being beneficial to the application of the chloride system molten salt heat transfer and storage medium in the compressed air energy storage system and solar power generation; the preparation method of the chloride molten salt heat transfer and storage medium has the advantages of strong universality, good use effect, simple and convenient operation and convenient implementation.
Drawings
FIG. 1 is a flow chart of a method for producing a chloride-based molten salt heat transfer and storage medium according to the present invention.
FIG. 2 is a schematic view of a compressed air energy storage system of the present invention.
FIG. 3 is a DSC chart of molten chloride salts of example 1 of the present invention.
FIG. 4 is a DSC chart of molten chloride salts of example 2 of the present invention.
FIG. 5 is a DSC chart of molten chloride salts of example 3 of the present invention.
FIG. 6 is a DSC chart of molten chloride salt of comparative example 1.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The nitrate system molten salt heat transfer and storage medium comprises NaCl, KCl and ZnCl2Nitrate-based melting according to an embodiment of the present inventionThe melting point of the salt heat transfer and storage medium is 200 ℃, and the use requirement of a compressed air energy storage system can be met.
Note that NaCl-CaCl is comparable to the prior art2Compared with the system, the system of the invention is more practical, and NaCl-CaCl2The melting point of the system is high, so that the system is not easy to solidify, and the heat preservation energy consumption of the system can be increased in practical application.
Thus, according to the chloride-based molten salt heat transfer and storage medium of the embodiment of the present invention, the melting point of the molten salt can be lowered, and the upper limit temperature of use can be raised.
According to one embodiment of the invention, the chloride-based molten salt heat transfer and storage medium comprises, by mass percent, NaCl: 10% -30%; KCl: 10% -30%; ZnCl2：50％-80％。
Preferably, the chloride-based molten salt heat transfer and storage medium comprises the following components in percentage by mass: 15% -30% of NaCl; 15% -25% of KCl; ZnCl255％-75％。
As shown in fig. 1, the method for producing a nitrate-based molten salt heat transfer and storage medium according to the present invention includes the steps of: s1, mixing NaCl, the KCl and the ZnCl2Mixing the raw materials in proportion to obtain a mixture; s2, grinding the mixture obtained in the step S1 to obtain mixture powder; s3, heating the mixed powder obtained in the step S2 to be molten, and then performing heat preservation and cooling to obtain a product. The preparation method provided by the embodiment of the invention has the advantages of good use effect, strong universality and the like.
Further, step S2 includes the following steps: s21, putting the mixture obtained in the step S1 into a mortar and uniformly stirring; s22, grinding the mixture evenly stirred in the step S21 until no obvious particles exist.
Optionally, step S3 includes: s31, putting the mixture mixed in the step S2 into a muffle furnace, and heating until the mixture is completely molten; s32, keeping the temperature of the molten mixture obtained in the step S31 and cooling.
According to an embodiment of the present invention, step S3 further includes: and step S33, taking out the cooled mixture and grinding the mixture into powder to obtain the product.
In some embodiments of the invention, the chloride-based molten salt heat transfer and storage medium is used in industrial energy storage and solar power generation.
As shown in fig. 2, preferably, the industrial energy storage is a compressed air energy storage system 100, and the compressed air energy storage system 100 includes: a gas storage chamber 10, a low temperature molten salt tank 20, a high temperature molten salt tank 30, a molten salt electric heater 40 and a turbine assembly.
Specifically, high-pressure gas can be stored in the gas storage chamber 10, a low-temperature molten salt containing cavity is defined in the low-temperature molten salt tank 20, molten salt can be stored in the low-temperature molten salt containing cavity, a high-temperature molten salt containing cavity is defined in the high-temperature molten salt tank 30, molten salt can be stored in the high-temperature molten salt containing cavity, the high-temperature molten salt containing cavity is communicated with the low-temperature molten salt containing cavity, molten salt in the high-temperature molten salt tank 30 and/or the low-temperature molten salt tank 20 is a nitrate system molten salt heat storage medium, the molten salt electric heater 40 is connected with the low-temperature molten salt tank 20 and can heat the molten salt in the low-temperature molten salt containing cavity to a high temperature and be in a flowing state, the molten salt in the low-temperature molten salt containing cavity flows to the high-temperature molten salt containing cavity to store heat energy, the turbine assembly is respectively connected with the gas storage chamber 10.
Further, the turbine assembly is a compressor.
Preferably, the turbine assembly comprises a first stage turbine 50, a second stage turbine 60, an Nth stage turbine, N is not less than 2, and the high-pressure gas after the work of the N-1 stage turbine enters the Nth stage turbine to be expanded and does work after being heated by molten salt again.
By describing that the turbine assembly comprises the first stage turbine 50, the second stage turbine 60 and the third stage turbine 70, the compressed air energy storage system 100 according to the embodiment of the invention couples the molten salt energy storage with the compressed air energy storage, and the air at the inlet of the turbine assembly is heated by using the heat in the molten salt heat storage system, so that the efficient energy storage and power generation are realized. The system comprises two processes of energy storage and energy release when in operation. During energy storage, the compressor is driven by utilizing off-peak electricity, abandoned wind electricity, abandoned light electricity and the like, the ambient atmosphere is compressed to high pressure and stored in the gas storage chamber 10, and the storage of high-pressure gas is completed. At the same time, the molten salt electric heater 40 heats the low-temperature molten salt in the low-temperature molten salt tank 20 to a high temperature by electric energy and stores the heated molten salt in the high-temperature molten salt tank 30, thereby completing the storage of thermal energy.
Wherein, the low ebb electricity: 22: 00-next day 8: the time of 00 hours is 10 hours, which is called as the valley period, the price of the produced electricity is low, and in the compressed air energy storage technology, the valley electricity can be stored for heating in the daytime. Abandoning wind power: the abandoned wind is the phenomenon that partial wind turbines of the wind power plant are suspended due to the self characteristics of insufficient local power grid acceptance capacity, unmatched construction period of the wind power plant, unstable wind power and the like under the normal condition of the wind turbines in the initial development stage of the wind power. Wind power output characteristics are different from those of a conventional power supply, on one hand, wind power prediction precision is low due to the characteristics of randomness and volatility of wind power output, and after wind power reaches a certain scale, if the standby level of a system is not improved, wind is hardly abandoned in scheduling operation; on the other hand, wind power has the characteristic of reverse peak regulation. Abandoning photoelectricity: abandoning light, abandoning the power generated by photovoltaic, generally means that the photovoltaic system is not allowed to be connected to the grid, because the power generated by the photovoltaic system is influenced by the environment and is in continuous change, the power is not a stable power supply, and the power grid management unit refuses the power grid access of the photovoltaic system.
When releasing energy, the high-pressure air is released from the air storage chamber 10, heated by the high-temperature molten salt, and then enters the first-stage turbine 50 to expand and do work. The air after work is discharged from the first stage turbine 50, heated again by high temperature molten salt (i.e. the molten salt releases heat), and then enters the second stage turbine 60 to do work. Similarly, the exhaust gas from the second stage turbine 60 is also heated by the high-temperature molten salt and enters the third stage turbine 70 to perform work. Finally, the exhaust from the third stage turbine 70 is directly vented to ambient atmosphere to complete the expansion power generation process.
The molten salt heat storage system mainly comprises a low-temperature molten salt tank 20, a high-temperature molten salt tank 30, a molten salt electric heater 40, a molten salt pump and the like. In a conventional two-tank arrangement, one each of the low temperature molten salt tank 20 and the high temperature molten salt tank 30 is provided, and molten salt is driven to flow in the system by a molten salt pump. The molten salt electric heater 40 absorbs fluctuating electric energy input, and can convert waste electricity such as waste wind and waste light into high-grade heat energy. Because the fused salt is used for heat storage, the limitation of a high-temperature compressor is eliminated, a conventional indirect cooling type compressor can be used, the compression efficiency of the system is improved, and the compression power consumption is reduced.
It should be noted that, in the process of compressing the ambient atmosphere to high pressure and storing the ambient atmosphere in the air storage chamber 10, the ambient atmosphere needs to be compressed layer by the compressor, and after the temperature becomes high, the ambient atmosphere needs to be cooled and then enters the air storage chamber 10, and the air storage chamber 10 may be a salt cavern.
The chloride-based molten salt heat transfer and storage medium and the method for producing the same according to the embodiments of the present invention will be specifically described below with reference to specific examples.
Example 1:
the chloride-based molten salt heat transfer and storage medium comprises 10% of sodium chloride, 20% of potassium chloride and 70% of zinc chloride.
A preparation method of a chloride molten salt heat transfer and storage medium comprises the following steps:
s1, mixing 10% of sodium chloride, 20% of potassium chloride and 70% of zinc chloride in a corundum crucible, and uniformly stirring to obtain a mixture;
s2, grinding the mixture to obtain mixture powder;
and S3, heating the mixture mixed in the step S2 in a muffle furnace at the temperature of 400 ℃ to melt the mixture, preserving the heat for 2 hours, cooling to room temperature, taking out, and crushing to powder to obtain the prepared chloride system molten salt.
The melting point test of the chloride molten salt prepared in the embodiment is carried out, the obtained curve is shown in fig. 3, and the test result shows that the melting point of the molten salt is 185.3 ℃, so that the requirement of compressed air energy storage can be well met.
Example 2
The chloride-based molten salt heat transfer and storage medium comprises 15% of sodium chloride, 25% of potassium chloride and 60% of zinc chloride.
A preparation method of a chloride molten salt heat transfer and storage medium comprises the following steps:
s1, mixing 15% of sodium chloride, 25% of potassium chloride and 60% of zinc chloride in a corundum crucible, and uniformly stirring to obtain a mixture;
s2, grinding the mixture to obtain mixture powder;
and S3, heating the mixture mixed in the step S2 in a muffle furnace at the temperature of 420 ℃ to melt the mixture, preserving the heat for 2 hours, cooling to room temperature, taking out, and crushing to powder to obtain the prepared chloride system molten salt.
The melting point test of the chloride molten salt prepared in the embodiment is adopted, the obtained curve is shown in fig. 4, and the test result shows that the melting point of the molten salt is 184.55 ℃, the melting point is lower than that of the embodiment 1, and the requirement of compressed air energy storage can be well met.
Example 3
The chloride-based molten salt heat transfer and storage medium comprises 20% of sodium chloride, 25% of potassium chloride and 55% of zinc chloride.
A preparation method of a chloride molten salt heat transfer and storage medium comprises the following steps:
s1, mixing 20% of sodium chloride, 25% of potassium chloride and 55% of zinc chloride in a corundum crucible, and uniformly stirring to obtain a mixture;
s2, grinding the mixture to obtain mixture powder;
and S3, heating the mixture mixed in the step S2 in a muffle furnace at 450 ℃ to melt the mixture, preserving the heat for 3 hours, cooling to room temperature, taking out, and crushing to powder to obtain the prepared chloride system molten salt.
The molten chloride-based salt prepared in this example was subjected to a melting point test, and the obtained curve is shown in fig. 5. The test result shows that the melting point of the molten salt is 176.64 ℃, the melting point is lower than that of the example 1, and the requirement of compressed air energy storage can be well met.
Comparative example 1
The chloride-based molten salt heat transfer and storage medium comprises 30% of sodium chloride and 70% of calcium chloride.
A preparation method of a chloride molten salt heat transfer and storage medium comprises the following steps:
s1, mixing 30% of sodium chloride and 70% of calcium chloride in a corundum crucible, and uniformly stirring to obtain a mixture;
s2, grinding the mixture to obtain mixture powder;
and S3, heating the mixture mixed in the step S2 in a muffle furnace at the temperature of 400 ℃ to melt the mixture, preserving the heat for 2 hours, cooling to room temperature, taking out, and crushing to powder to obtain the prepared chloride system molten salt.
The melting point test of the chloride molten salt prepared in this example is performed, the obtained curve is shown in fig. 6, and the test result shows that the melting point of the molten salt is 434 ℃, and the melting point is too high and is greatly increased compared with that of example 1, so that the requirement of compressed air energy storage cannot be well met.
According to the chloride-based molten salt heat transfer and storage medium and the preparation method thereof in the embodiments 1 to 3 of the invention, the melting point of the molten salt can be reduced, the use upper limit temperature of the molten salt can be increased, and the application of the molten salt in a compressed air energy storage system and solar power generation is facilitated.
Example 4
As shown in fig. 2, the present embodiment provides a chloride-based molten salt heat transfer and storage medium for use in industrial energy storage and solar power generation, where the industrial energy storage is a compressed air energy storage system, and the compressed air energy storage system includes:
a gas storage chamber 10 in which high-pressure gas can be stored;
the low-temperature molten salt tank 20 is internally provided with a low-temperature molten salt accommodating cavity, and molten salt can be stored in the low-temperature molten salt accommodating cavity;
the high-temperature molten salt tank 30 is internally provided with a high-temperature molten salt accommodating cavity, molten salt can be stored in the high-temperature molten salt accommodating cavity, the high-temperature molten salt accommodating cavity is communicated with the low-temperature molten salt accommodating cavity, and the molten salt in the high-temperature molten salt tank and/or the low-temperature molten salt tank is a chloride system molten salt heat transfer and storage medium;
a molten salt electric heater 40 connected to the low-temperature molten salt tank, capable of heating the molten salt in the low-temperature molten salt accommodating chamber to a high temperature and in a flowing state, and allowing the molten salt in the low-temperature molten salt accommodating chamber to flow to the high-temperature molten salt accommodating chamber to store thermal energy;
the turbine assembly is respectively connected with the gas storage chamber and the high-temperature molten salt tank, the high-pressure gas is expanded to generate power to release energy after being released from the gas storage chamber, the turbine assembly comprises a first-stage turbine and a second-stage turbine, the N is not less than 2, and the high-pressure gas after working by the N-1 stage turbine is heated by molten salt again and then enters the N stage turbine to be expanded to work.
The chloride system molten salt heat transfer and storage medium can reduce the melting point of molten salt, improve the use upper limit temperature, and meet the use requirement of a compressed air energy storage system, thereby being beneficial to the application of the chloride system molten salt heat transfer and storage medium in the compressed air energy storage system and solar power generation; the preparation method of the chloride molten salt heat transfer and storage medium has the advantages of strong universality, good use effect, simple and convenient operation and convenient implementation.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (10)

1. A chloride-based molten salt heat transfer and storage medium, characterized in that: the composite material comprises the following components in percentage by mass:
NaCl 10％-30％；
KCl 10％-30％；
ZnCl2 50％-80％。
2. the chloride-based molten salt heat transfer and storage medium according to claim 1, characterized in that: the composite material comprises the following components in percentage by mass:
NaCl 15％-30％；
KCl 15％-25％；
ZnCl2 55％-75％。
3. a method for preparing a chloride-based molten salt heat transfer and storage medium is characterized by comprising the following steps: the method comprises the following steps:
s1, mixing NaCl, KCl and ZnCl2Mixing the raw materials according to the proportion to obtain a mixture;
s2, grinding the mixture to obtain mixture powder;
s3, heating the mixed powder obtained in the step S2 to be molten, and then performing heat preservation and cooling to obtain a product.
4. The method for producing a chloride-based molten salt heat transfer and storage medium according to claim 3, characterized in that: the step S2 includes the steps of:
s21, putting the mixture obtained in the step S1 into a mortar and uniformly stirring;
s22, grinding the mixture evenly stirred in the step S21 until no particles exist.
5. The method for producing a chloride-based molten salt heat transfer and storage medium according to claim 3, characterized in that: the step S3 further includes grinding the cooled powder into powder.
6. The method for producing a chloride-based molten salt heat transfer and storage medium according to claim 3, characterized in that: the heating temperature of the step S3 is 400-450 ℃, and the heat preservation time is 2-3 h.
7. Use of the chloride-based molten salt heat transfer and storage medium according to any one of claims 1-2 in industrial energy storage and solar power generation.
8. Use of the chloride-based molten salt heat transfer and storage medium according to any one of claims 1-2 in industrial energy storage and solar power generation, wherein the industrial energy storage is a compressed air energy storage system comprising:
a gas storage chamber in which high pressure gas can be stored;
the low-temperature molten salt tank is internally provided with a low-temperature molten salt accommodating cavity, and molten salt can be stored in the low-temperature molten salt accommodating cavity;
the high-temperature molten salt tank is internally provided with a high-temperature molten salt accommodating cavity, molten salt can be stored in the high-temperature molten salt accommodating cavity, and the high-temperature molten salt accommodating cavity is communicated with the low-temperature molten salt accommodating cavity;
the molten salt electric heater is connected with the low-temperature molten salt tank;
and the turbine assembly is respectively connected with the air storage chamber and the high-temperature molten salt tank, and the high-pressure gas is expanded to generate power to release energy after being released from the air storage chamber.
9. Use of the chloride-based molten salt heat transfer and storage medium according to any one of claims 1 to 2 in industrial energy storage and solar power generation, wherein the molten salt in the high-temperature molten salt tank and/or the low-temperature molten salt tank is a chloride-based molten salt heat transfer and storage medium.
10. The application of the chloride-based molten salt heat transfer and storage medium according to any one of claims 1-2 in industrial energy storage and solar power generation, wherein the turbine assembly comprises a first-stage turbine and a second-stage turbine.
CN202110040416.6A 2021-01-13 2021-01-13 Chloride-based molten salt heat transfer and storage medium and preparation method and application thereof Pending CN112877038A (en)

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Application publication date: 20210601