CN111909664A - Inorganic fiber composite chlorine system molten salt heat storage material and preparation method and application thereof - Google Patents
Inorganic fiber composite chlorine system molten salt heat storage material and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses an inorganic fiber composite chlorine-based molten salt heat storage material and a preparation method and application thereof, wherein the inorganic fiber composite chlorine-based molten salt heat storage material comprises the following components: an inorganic fiber; chlorine-based molten salt; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 2-3: 100. The heat storage material is formed by compounding the inorganic fibers and the chlorine-system molten salt according to a certain proportion, wherein the heat conductivity coefficient of the molten salt can be obviously improved by adding a trace amount of the inorganic fibers, so that the internal heat is transferred more quickly, the heat is distributed more uniformly, and certain coating can be formed after the inorganic fibers and the chlorine-system molten salt are mixed, thereby being beneficial to reducing the corrosivity of the chlorine-system molten salt. The heat storage material has the advantages of high phase change latent heat, good heat transfer and storage performance, low high-temperature viscosity, contribution to fluid flow and good heat transfer effect, and has the advantages of higher upper limit working temperature, larger use temperature range, low cost and the like compared with the traditional nitrate heat storage material.
Description
Technical Field
The invention belongs to the technical field of physical heat transfer and energy storage, and particularly relates to an inorganic fiber composite chlorine system molten salt heat storage material and a preparation method and application thereof.
Background
Along with the development of economy, the demand of human beings on energy is increasing day by day, the reserves of conventional energy such as coal, petroleum, natural gas and the like as main energy are decreasing day by day, and the damage to the ecological environment caused by pollutants discharged in the utilization process of the conventional energy is aggravated day by day, and the energy and environmental problems become two main problems which are generally concerned in the world at present. In order to maintain the sustainable development of society, in addition to the need for efficient and clean conversion and utilization of conventional energy resources, development and utilization of various renewable energy sources and green energy sources are also required.
Among the many new energy sources, solar energy has unique "infinite" reserves, widespread, clean-of-use and economic advantages, and is receiving increasing attention. Therefore, solar energy is bound to play a role in the future conversion of energy structures, and becomes an ideal alternative energy source.
The heat storage technology is a key technology in the solar thermal power generation industry, and the molten salt is a leading material in the heat storage industry. The molten salt is a condition that a solid inorganic compound or a mixture of several inorganic compounds which is often seen by people is heated to be completely molten into a liquid state (for example, common salt and common sodium chloride are molten at 800 ℃), so that the liquid salt is circulated to achieve the purpose of energy transfer.
The molten salt generally comprises a chloride system, a carbonate system and a nitrate system, at present, the carbonate system and the nitrate system are mainly researched at home and abroad, and the chloride system is less. At present, a great deal of research work is carried out on molten salts, and the multi-component low-melting-point mixed molten salts are disclosed in the publication numbers of CN104559942B, CN111040739A, CN108467712A, CN106590546A, CN106867470A, CN107794005A and the like, but the formulations do not contain chloride inorganic salt components basically, and the formulation research of inorganic fiber composite chloride molten salts is rarely reported.
In view of the increasingly high temperature requirement of a solar thermal power generation system and the working temperature of solar high-temperature thermochemical reaction generally about 750 ℃, although the industrial application of the molten nitrate salt is mature, the working temperature range is 180-550 ℃, and heat transfer and storage materials with the upper limit higher than 600 ℃ are hardly used in China. Therefore, it is highly desirable to prepare a heat transfer and storage material with an operating temperature of 600 ℃ or higher, and the operating temperature range of the mixed chlorine-based molten salt can be matched with the heat transfer and storage material.
In conclusion, the development of the composite chlorine molten salt with low melting point, higher use upper limit temperature and high heat conductivity coefficient has great significance for medium-high temperature heat transfer and storage systems.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the inorganic fiber composite chlorine system molten salt heat storage material has the advantages of high phase change latent heat, good heat transfer and storage performance, low high-temperature viscosity, contribution to fluid flow and good heat transfer effect.
The invention also provides a preparation method of the inorganic fiber composite chlorine series molten salt heat storage material, and the method has the advantages of low cost and the like.
The invention also provides application of the inorganic fiber composite chlorine system molten salt heat storage material, the efficiency of the molten salt circulating system is high, and the power generation efficiency of solar thermal power generation is further improved.
The inorganic fiber composite chlorine-based molten salt heat storage material comprises the following components: an inorganic fiber; and the chlorine-based molten salt, wherein the mass ratio of the inorganic fibers to the chlorine-based molten salt is 2-3: 100.
According to the heat storage material of the inorganic fiber composite chlorine-based molten salt, the heat storage material is formed by compounding the inorganic fiber and the chlorine-based molten salt according to a certain proportion, wherein the heat conductivity coefficient of the molten salt can be obviously improved by adding a trace amount of the inorganic fiber, so that the internal heat transfer is faster, the heat distribution is more uniform, and a certain coating can be formed after the inorganic fiber and the chlorine-based molten salt are mixed, so that the corrosivity of the chlorine-based molten salt can be reduced. The heat storage material has the advantages of high phase change latent heat, good heat transfer and storage performance, low high-temperature viscosity, contribution to fluid flow and good heat transfer effect, and compared with the traditional nitrate heat storage material, the heat storage material also has the advantages of higher upper limit working temperature, expanded use temperature range of molten salt and low cost.
According to an embodiment of the present invention, the inorganic fiber is one of glass fiber, metal fiber, ceramic fiber, carbon fiber, and graphite fiber.
According to an embodiment of the present invention, the chlorine-based molten salt is a mixture of at least three of sodium chloride, potassium chloride, magnesium chloride, lithium chloride, and calcium chloride.
According to one embodiment of the invention, the chlorine-based molten salt comprises the following single-component salts in percentage by mass: 50-60% of sodium chloride, 16-22% of potassium chloride and 18-26% of magnesium chloride.
According to an embodiment of the present invention, the chlorine-based molten salt further includes one or both of 1% to 5% of lithium chloride and 1% to 5% of calcium chloride.
According to one embodiment of the invention, the chlorine-based molten salt comprises, in mass percent: 50% -60% of sodium chloride; 16 to 22 percent of potassium chloride; 18 to 26 percent of magnesium chloride; 1% -5% of lithium chloride; 1 to 5 percent of calcium chloride.
According to the second aspect of the invention, the preparation method of the inorganic fiber composite chlorine-based molten salt heat storage material comprises the following steps: s1, adding two or more than two of monosalts of sodium chloride, potassium chloride and calcium chloride into a solvent for dissolving, and uniformly mixing to obtain a mixed solution; s2, drying the mixed solution and grinding into fine particles to obtain first mixed powder; s3, mixing the first mixed powder with magnesium chloride particles and lithium chloride particles, heating the first mixed powder to a molten state to form uniform liquid, taking out the molten salt, naturally cooling to room temperature, and grinding again to obtain chlorine-system molten salt; and S4, mixing the chlorine-based molten salt obtained in the step S3 with inorganic fibers to obtain the inorganic fiber composite chlorine-based molten salt heat storage material.
According to an embodiment of the present invention, the mass percentages of the single salt in step S1 and step S4 are: 50-60% of sodium chloride, 16-22% of potassium chloride, 18-26% of magnesium chloride, 1-5% of lithium chloride and 1-5% of calcium chloride.
According to an embodiment of the present invention, the mass ratio of the inorganic fibers to the chlorine-based molten salt in step S4 is 2 to 3: 100.
According to one embodiment of the invention, in the step S1, the solvent is ultrapure water, the stirring temperature is 90-95 ℃, and in the step S2, the mixed solution is dried in vacuum at 110-120 ℃.
According to an embodiment of the present invention, in step S3, the mixed powder is heated to a molten state at 700 ℃ and maintained for a predetermined time.
According to an embodiment of the present invention, the first mixed powder in step S2 is ground into fine particles of 50 mesh to 150 mesh.
According to one embodiment of the present invention, the molten salt is naturally cooled and then ground into fine particles of 50 mesh to 150 mesh in step S3.
The application of the inorganic fiber composite chlorine-based molten salt heat storage material in the third aspect of the invention as a high-temperature heat storage and/or transfer medium in the fields of photo-thermal power generation, heat storage and supply and industrial waste heat recovery comprises the inorganic fiber composite chlorine-based molten salt heat storage material in any one of the above embodiments.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flow chart of a method for preparing an inorganic fiber composite chlorine-based molten salt heat storage material according to an embodiment of the invention.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make several modifications to the present invention without departing from the principle of the present invention, and all changes and modifications that are equivalent to those made in the present invention are also within the scope of the appended claims.
The inorganic fiber composite chlorine-based molten salt heat storage material according to the embodiment of the invention is specifically described below.
The inorganic fiber composite chlorine-based molten salt heat storage material comprises the following components: inorganic fibers and chlorine-based molten salts.
Specifically, the mass ratio of the inorganic fiber to the chlorine-based molten salt is 2-3: 100, that is, the inorganic fiber composite chlorine-based molten salt heat storage material according to the embodiment of the present invention is mainly composed of the inorganic fiber and the chlorine-based molten salt, the mass ratio of the inorganic fiber to the chlorine-based molten salt may be 2:100, 3:100, 2.5:100, or the like, that is, the mass fraction of the chlorine-based molten salt is 100, and the mass fraction of the inorganic fiber may be any value from 2 to 3.
Therefore, according to the heat storage material of the inorganic fiber composite chlorine-based molten salt, which is disclosed by the embodiment of the invention, the heat storage material is formed by compounding the inorganic fiber and the chlorine-based molten salt according to a certain proportion, wherein the heat conductivity coefficient of the molten salt can be obviously improved by adding a trace amount of the inorganic fiber, so that the internal heat transfer is faster, the heat distribution is more uniform, and a certain coating can be formed after the inorganic fiber and the chlorine-based molten salt are mixed, so that the corrosivity of the chlorine-based molten salt is favorably reduced. The heat storage material has the advantages of high phase change latent heat, good heat transfer and storage performance, low high-temperature viscosity, contribution to fluid flow and good heat transfer effect, and compared with the traditional nitrate heat storage material, the heat storage material also has the advantages of higher upper limit working temperature, expanded use temperature range of molten salt and low cost.
According to one embodiment of the present invention, the inorganic fiber is one of glass fiber, metal fiber, ceramic fiber, carbon fiber and graphite fiber, that is, the kind of the inorganic fiber is high temperature resistant fiber.
Further, the chlorine-based molten salt is a mixture of at least three of sodium chloride, potassium chloride, magnesium chloride, lithium chloride and calcium chloride. The mixture with different compositions has different characteristics and high selectivity.
Optionally, the chlorine-based molten salt comprises the following single-component salts in percentage by mass: 50-60% of sodium chloride, 16-22% of potassium chloride and 18-26% of magnesium chloride.
Further, the chlorine-based molten salt is added with any one or two of 1-5% of lithium chloride and 1-5% of calcium chloride.
Preferably, the chlorine-based molten salt comprises, in mass percent: 50% -60% of sodium chloride; 16 to 22 percent of potassium chloride; 18 to 26 percent of magnesium chloride; 1% -5% of lithium chloride; 1 to 5 percent of calcium chloride.
Therefore, according to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, chlorine-based molten salts with different proportions can be compounded with inorganic fibers according to use requirements, so that the inorganic fiber composite chlorine-based molten salt heat storage material has high flexibility and applicability, and has a higher upper limit working temperature and a larger use temperature range. Specifically, the upper limit of the use temperature is higher than 700 ℃, and the use temperature range is 385-750 ℃. The molten salt circulating system can be applied to the related fields of solar high-temperature thermal power generation, industrial waste heat recovery and the like, the efficiency of the molten salt circulating system can be improved, and the power generation efficiency of solar thermal power generation is further improved.
According to the preparation method of the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the chlorine-based molten salt comprises sodium chloride, potassium chloride, calcium chloride, magnesium chloride and lithium chloride, and the preparation method comprises the following steps: s1, adding two or more than two of monosalts of sodium chloride, potassium chloride and calcium chloride into a solvent for dissolving, and uniformly mixing to obtain a mixed solution; s2, drying the mixed solution and grinding into fine particles to obtain first mixed powder; s3, mixing the first mixed powder with magnesium chloride particles and lithium chloride particles, heating the first mixed powder to a molten state to form uniform liquid, taking out the molten salt, naturally cooling to room temperature, and grinding again to obtain chlorine-system molten salt; and S4, mixing the chlorine-based molten salt obtained in the step S3 with inorganic fibers to obtain the inorganic fiber composite chlorine-based molten salt heat storage material. That is, in steps S1 and S2, two or more of the simple salts of sodium chloride, potassium chloride, and calcium chloride are dissolved in a solvent, and after mixing, the mixture is dried to evaporate water, thereby achieving the purpose of uniform mixing. Step S3, through mixing the magnesium chloride and the lithium chloride, the problem that the magnesium chloride and the lithium chloride are dissolved in water and then evaporated to be hydrolyzed into other substances can be solved, and the magnesium chloride and the lithium chloride are heated to a molten state and then ground to be fully mixed; finally, the thermal conductivity can be further improved by adding the inorganic fiber to the chlorine-based molten salt in step S4.
Optionally, the mass percentages of the single salt in step S1 and step S4 are: 50-60% of sodium chloride, 16-22% of potassium chloride, 18-26% of magnesium chloride, 1-5% of lithium chloride and 1-5% of calcium chloride.
According to an embodiment of the present invention, the mass ratio of the inorganic fiber to the chlorine-based molten salt in step S4 is 2 to 3: 100.
Further, in step S1, the solvent is ultrapure water, the stirring temperature is 90-95 ℃, and in step S2, the mixed solution is vacuum-dried at 110-120 ℃. The solvent is ultrapure water, can be evaporated by heating to 100 ℃, and does not introduce new impurities.
In some embodiments of the present invention, in step S3, the mixed powder is heated to a molten state at 700 ℃ and maintained for a predetermined time.
Alternatively, the first mixed powder in step S2 is ground into fine particles of 50 to 150 mesh. The fine particles of 50 to 150 meshes can be mixed more uniformly.
Further, in step S3, the molten salt is naturally cooled and ground into fine particles of 50 to 150 mesh.
The inorganic fiber composite chlorine-based molten salt heat storage material provided by any embodiment of the invention can be used as a high-temperature heat storage and/or heat transfer medium to be applied to the fields of photo-thermal power generation, heat storage and supply and industrial waste heat recovery. Because the inorganic fiber composite chlorine-based molten salt heat storage material has the technical effects, the inorganic fiber composite chlorine-based molten salt heat storage material has corresponding technical effects when being applied to the fields of photo-thermal power generation, heat storage and heat supply and industrial waste heat recovery, namely the heat storage material has the advantages of high phase change latent heat, heat transfer and storage performance, low high-temperature viscosity, contribution to fluid flow, good heat transfer effect, low cost and the like.
The inorganic fiber composite chlorine-based molten salt heat storage material according to the embodiment of the present invention will be specifically described below with reference to specific embodiments.
Example 1
According to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the chlorine-based molten salt comprises the following components in percentage by mass: 50% of sodium chloride; 20% of potassium chloride; 30% of magnesium chloride; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 2: 100; the melting point was found to be 395 ℃, the latent heat of phase change to be 279J/g, the thermal decomposition temperature to be 745 ℃, and the thermal conductivity to be 0.657W/(m.K) (thermal conductivity of the heat storage material at 650 ℃).
Example 2
According to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the chlorine-based molten salt comprises the following components in percentage by mass: sodium chloride, 52%; 22% of potassium chloride; 26% of magnesium chloride; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 2: 100; the melting point was found to be 397 deg.C, the latent heat of phase change was 268J/g, the thermal decomposition temperature was 738 deg.C, and the thermal conductivity was 0.621W/(m.K) (thermal conductivity of the heat storage material at 650 deg.C).
Example 3
According to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the chlorine-based molten salt comprises the following components in percentage by mass: 56% of sodium chloride; 18% of potassium chloride; 26% of magnesium chloride; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 2.5: 100; the melting point was determined to be 398 ℃, the latent heat of phase change was 261J/g, the thermal decomposition temperature was 743 ℃, and the thermal conductivity was 0.695W/(m.K) (thermal conductivity of the heat storage material at 650 ℃).
Example 4
According to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the chlorine-based molten salt comprises the following components in percentage by mass: 50% of sodium chloride; 20% of potassium chloride; 25% of magnesium chloride; 5% of calcium chloride; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 3: 100; the melting point is 400 ℃, the phase change latent heat is 270J/g, the thermal decomposition temperature is 750 ℃, and the thermal conductivity is 0.714W/(m.K) (the thermal conductivity of the heat storage material at 650 ℃).
Example 5
According to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the molten salt comprises the following components in percentage by mass: 55% of sodium chloride; 18% of potassium chloride; 24% of magnesium chloride; 3% of lithium chloride; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 3: 100; the melting point was found to be 395 ℃ and the latent heat of phase change was found to be 275J/g, the thermal decomposition temperature was found to be 748 ℃ and the thermal conductivity was found to be 0.708W/(m.K) (thermal conductivity of the heat storage material at 650 ℃).
Example 6
According to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the molten salt comprises the following components in percentage by mass: 50% of sodium chloride; 20% of potassium chloride; 22% of magnesium chloride; 5% of calcium chloride; 3% of lithium chloride; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 3: 100; the melting point is 390 ℃, the phase change latent heat is 264J/g, the thermal decomposition temperature is 739 ℃, and the thermal conductivity is 0.735W/(m.K) (the thermal conductivity of the heat storage material at 650 ℃).
Example 7
According to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the molten salt comprises the following components in percentage by mass: 50% of sodium chloride; 20% of potassium chloride; 20% of magnesium chloride; 5% of calcium chloride; 5% of lithium chloride; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 3: 100; the melting point was found to be 385 deg.C, the latent heat of phase change was found to be 259J/g, the thermal decomposition temperature was found to be 746 deg.C, and the thermal conductivity was found to be 0.729W/(m.K) (thermal conductivity of the heat storage material at 650 deg.C).
Example 8
According to the inorganic fiber composite chlorine-based molten salt heat storage material provided by the embodiment of the invention, the molten salt comprises the following components in percentage by mass: 50% of sodium chloride; 22% of potassium chloride; 20% of magnesium chloride; 3% of calcium chloride; 5% of lithium chloride; the mass ratio of the inorganic fiber to the chlorine-based molten salt is 3: 100; the melting point is 391 ℃, the phase change latent heat is 278J/g, the thermal decomposition temperature is 741 ℃, and the thermal conductivity is 0.731W/(m.K) (the thermal conductivity of the heat storage material at 650 ℃).
The inorganic fiber composite chlorine-based molten salt heat storage materials prepared in examples 1 to 8 were subjected to performance tests, and specific test results are shown in table 1.
Table 1 is a numerical value table of the melting point, thermal decomposition temperature, latent heat of phase change, and thermal conductivity of the molten salts of examples 1 to 8 of the inorganic fiber composite chlorine-based molten salt heat storage material according to the embodiment of the invention.
TABLE 1 Performance test Table
| Examples | Melting Point/. degree.C | Thermal decomposition temperature/. degree.C | Latent heat of phase change (J/g) | Thermal conductivity W/(m.K) |
| 1 | 395 | 745 | 279 | 0.657 |
| 2 | 397 | 738 | 268 | 0.621 |
| 3 | 398 | 743 | 261 | 0.695 |
| 4 | 400 | 750 | 270 | 0.714 |
| 5 | 395 | 748 | 275 | 0.708 |
| 6 | 390 | 739 | 264 | 0.735 |
| 7 | 385 | 746 | 259 | 0.729 |
| 8 | 391 | 741 | 278 | 0.731 |
Therefore, the inorganic fiber composite chlorine-based molten salt heat storage material has the advantages of high stability, high latent heat, high heat storage density and the like, has a higher upper limit of use temperature compared with nitrate molten salt, is higher than 700 ℃, has a wide range of use temperature, preferably 385-750 ℃, has a high heat conductivity coefficient, is suitable for medium-high temperature heat transfer, and can be widely applied to the related fields of solar high-temperature thermal power generation, industrial waste heat recovery and the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (14)
1. An inorganic fiber composite chlorine system molten salt heat storage material is characterized by comprising the following components:
an inorganic fiber;
and the chlorine-based molten salt, wherein the mass ratio of the inorganic fibers to the chlorine-based molten salt is 2-3: 100.
2. The inorganic fiber composite chlorine-based molten salt heat storage material of claim 1, wherein the inorganic fiber is one of a glass fiber, a metal fiber, a ceramic fiber, a carbon fiber, and a graphite fiber.
3. The inorganic fiber composite chlorine-based molten salt heat storage material according to claim 1, wherein the chlorine-based molten salt is a mixture of at least three of sodium chloride, potassium chloride, magnesium chloride, lithium chloride, and calcium chloride.
4. The inorganic fiber composite chlorine-based molten salt heat storage material of claim 2, wherein the chlorine-based molten salt comprises the following single-component salts in percentage by mass: 50-60% of sodium chloride, 16-22% of potassium chloride and 18-26% of magnesium chloride.
5. The inorganic fiber composite chlorine-based molten salt heat storage material of claim 4, wherein the chlorine-based molten salt is further added with any one or two of 1-5% of lithium chloride and 1-5% of calcium chloride.
6. The inorganic fiber composite chlorine-based molten salt heat storage material according to claim 3, wherein the chlorine-based molten salt comprises, in mass percent:
50% -60% of sodium chloride;
16 to 22 percent of potassium chloride;
18 to 26 percent of magnesium chloride;
1% -5% of lithium chloride;
1 to 5 percent of calcium chloride.
7. The preparation method of the inorganic fiber composite chlorine-based molten salt heat storage material according to claim 6, wherein the chlorine-based molten salt comprises sodium chloride, potassium chloride, calcium chloride, magnesium chloride and lithium chloride, and the method comprises the following steps:
s1, adding two or more than two of monosalts of sodium chloride, potassium chloride and calcium chloride into a solvent for dissolving, and uniformly mixing to obtain a mixed solution;
s2, drying the mixed solution and grinding into fine particles to obtain first mixed powder;
s3, mixing the first mixed powder with magnesium chloride particles and lithium chloride particles, heating the first mixed powder to a molten state to form uniform liquid, taking out the molten salt, naturally cooling to room temperature, and grinding again to obtain chlorine-system molten salt;
and S4, mixing the chlorine-based molten salt obtained in the step S3 with inorganic fibers to obtain the inorganic fiber composite chlorine-based molten salt heat storage material.
8. The preparation method of the inorganic fiber composite chlorine-based molten salt heat storage material according to claim 7, wherein the mass percentages of the single salt in the steps S1 and S4 are as follows: 50-60% of sodium chloride, 16-22% of potassium chloride, 18-26% of magnesium chloride, 1-5% of lithium chloride and 1-5% of calcium chloride.
9. The preparation method of the inorganic fiber composite chlorine-based molten salt heat storage material according to claim 7, wherein the mass ratio of the inorganic fiber to the chlorine-based molten salt in step S4 is 2-3: 100.
10. The method for preparing the inorganic fiber chlorine composite molten salt heat storage material according to claim 7, wherein the solvent is ultrapure water in step S1, the stirring temperature is 90 ℃ to 95 ℃, and the mixed solution is vacuum-dried at 110 ℃ to 120 ℃ in step S2.
11. The method for preparing an inorganic fiber chlorine composite molten salt heat storage material according to claim 7, wherein in step S3, the mixed powder is heated to a molten state at 700 ℃ and maintained for a predetermined time.
12. The method for preparing an inorganic fiber composite chlorine-based molten salt heat storage material according to claim 7, wherein the first mixed powder in step S2 is ground into fine particles of 50 mesh to 150 mesh.
13. The preparation method of the inorganic fiber chlorine composite molten salt heat storage material according to claim 7, characterized in that the molten salt is naturally cooled and ground into fine particles of 50 mesh to 150 mesh in step S3.
14. The use of the inorganic fiber composite chlorine-based molten salt heat storage material according to any one of claims 1 to 6 as a high-temperature heat storage and/or transfer medium in the fields of photo-thermal power generation, heat storage and supply, and industrial waste heat recovery.
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| CN113372886A (en) * | 2021-07-01 | 2021-09-10 | 中国科学院上海应用物理研究所 | Ternary chloride molten salt with high-temperature thermal stability and preparation method thereof |
| CN116199377A (en) * | 2023-02-23 | 2023-06-02 | 浙江大学 | Incineration fly ash resource utilization method for quality control of washing waste salt |
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