CN113789161A - Heat transfer and heat storage material and preparation method and application thereof - Google Patents
Heat transfer and heat storage material and preparation method and application thereof Download PDFInfo
- Publication number
- CN113789161A CN113789161A CN202110985906.3A CN202110985906A CN113789161A CN 113789161 A CN113789161 A CN 113789161A CN 202110985906 A CN202110985906 A CN 202110985906A CN 113789161 A CN113789161 A CN 113789161A
- Authority
- CN
- China
- Prior art keywords
- nitrate
- molten
- magnesium oxide
- heat transfer
- storage material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
Abstract
The invention discloses a heat transfer and storage material and a preparation method and application thereof. The heat transfer and heat storage material comprises molten nitrate salt and modified magnesium oxide nanoparticles doped in the molten nitrate salt, wherein the modified magnesium oxide nanoparticles comprise magnesium oxide nanoparticles and carbonic acid molten salt modified on the surfaces of the magnesium oxide nanoparticles. The preparation method of the heat transfer and heat storage material comprises the following steps: 1) preparing magnesium oxide nanoparticles; 2) preparing modified magnesium oxide nanoparticles; 3) and mixing the modified magnesium oxide nanoparticles with molten nitrate salt, and calcining to obtain the finished product. The heat transfer and storage material has the advantages of low melting point, wide temperature range, large specific heat capacity, large energy storage density, large heat conductivity coefficient, high heat conductivity and the like, and has wide application prospect in the fields of industrial waste heat recovery, solar thermal power generation and the like.
Description
Technical Field
The invention relates to the technical field of heat transfer and heat storage materials, in particular to a heat transfer and heat storage material and a preparation method and application thereof.
Background
The high-efficiency heat transfer and storage technology can effectively solve the problems of intermittent and unstable energy supply in the process of large-scale solar energy utilization and industrial waste heat recovery, can effectively improve the efficiency of energy conversion and utilization, and the research and development of heat transfer and storage materials are the key for the development of the high-efficiency heat transfer and storage technology.
At present, molten salt materials commonly used for heat transfer and storage systems mainly include chloride molten salt, carbonate molten salt, and nitrate molten salt. The related thermophysical properties of the chloride fused salt are not outstanding, and the problems of strong corrosivity, poor high-temperature long-time heat preservation stability, easy volatilization and the like exist, so that the construction and the maintenance of a heat storage system are greatly influenced. The carbonic acid molten salt has higher specific heat capacity and thermal conductivity, but has high melting point, narrow energy storage temperature range and higher viscosity at high temperature. Molten nitrate is a commercially available molten salt heat transfer and storage material, has excellent high-temperature heat stability, has a low melting point (below 100 ℃ at the lowest), is low in corrosivity, but has lower specific heat capacity and thermal conductivity than molten carbonate, and limits the heat transfer and storage efficiency in engineering application.
It was found that the thermal properties of molten nitrate salts can be improved by adding media such as expanded graphite, ceramic foam, metal foam, carbon nanotubes, water glass, and alumina nanoparticles to the molten nitrate salts (CN 108117860A, CN 108531142A, CN 103923612A, CN 104559941 a, etc.), and the thermal properties of molten carbonate salts can be improved by adding magnesium powder, metal oxides, etc. to the molten carbonate salts (CN 107177348A). However, although the above methods can increase the thermal conductivity of the molten salt material or/and widen the operating temperature range of the molten salt material, none of the methods can increase the specific heat capacity and the energy storage density of the molten salt material, and even the specific heat capacity of the molten salt material may be reduced.
Therefore, it is of great significance to develop a heat transfer and storage material with the advantages of low melting point, wide temperature range, high specific heat, high heat conductivity and the like.
Disclosure of Invention
The invention aims to provide a heat transfer and storage material, and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
the heat transfer and heat storage material comprises molten nitrate salt and modified magnesium oxide nanoparticles doped in the molten nitrate salt, wherein the modified magnesium oxide nanoparticles comprise magnesium oxide nanoparticles and carbonic acid molten salt modified on the surfaces of the magnesium oxide nanoparticles.
Preferably, the mass percentage of the molten nitrate salt and the modified magnesium oxide nanoparticles in the heat transfer and heat storage material is as follows: molten nitrate salt: 95 to 99.5 percent; modified magnesium oxide nanoparticles: 0.5 to 5 percent.
Preferably, the particle size of the modified magnesium oxide nanoparticles is 50 nm-1000 nm.
Preferably, the molten nitrate salt is one of calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt, potassium nitrate-sodium nitrite ternary molten nitrate salt, and potassium nitrate-sodium nitrate binary molten nitrate salt.
Preferably, the calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt consists of the following components in percentage by mass: calcium nitrate: 40% -50%; sodium nitrate: 8% -10%; potassium nitrate: 40 to 50 percent.
Preferably, the potassium nitrate-sodium nitrite ternary nitrate molten salt consists of the following components in percentage by mass: potassium nitrate: 50% -60%; sodium nitrate: 5% -10%; sodium nitrite: 35 to 45 percent.
Preferably, the potassium nitrate-sodium nitrate binary molten nitrate salt consists of the following components in percentage by mass: potassium nitrate: 60% -70%; sodium nitrate: 30 to 40 percent.
Preferably, the carbonate molten salt is lithium carbonate-sodium carbonate-potassium carbonate ternary carbonate molten salt.
Preferably, the lithium carbonate-sodium carbonate-potassium carbonate ternary carbonate molten salt consists of the following components in percentage by mass: lithium carbonate: 30% -33%; sodium carbonate: 30% -40%; potassium carbonate: 30 to 40 percent.
The preparation method of the heat transfer and heat storage material comprises the following steps:
1) mixing magnesium chloride and calcium-containing molten nitrate salt, calcining, adding water to the calcined product for dispersing, centrifuging and drying to obtain magnesium oxide nanoparticles;
2) mixing the magnesium oxide nanoparticles with the molten carbonate, calcining, adding water to the calcined product for dispersing, centrifuging and drying to obtain magnesium oxide nanoparticles modified by the molten carbonate, namely modified magnesium oxide nanoparticles;
3) and mixing the modified magnesium oxide nanoparticles with molten nitrate salt, and calcining to obtain the finished product.
Preferably, the mass ratio of the magnesium chloride (calculated by being converted into magnesium oxide) and the molten nitrate salt in the step 1) is 1: 19-1: 99.
Preferably, the calcination in the step 1) is carried out at 400-600 ℃, and the heat preservation time is 5-8 h.
Preferably, the calcination in the step 2) is carried out at 400-600 ℃, and the heat preservation time is 3-4 h.
Preferably, the calcination in the step 3) is carried out at 400-600 ℃, and the heat preservation time is 6-8 h.
The invention has the beneficial effects that: the heat transfer and storage material has the advantages of low melting point, wide temperature range, large specific heat capacity, large energy storage density, large heat conductivity coefficient, high heat conductivity and the like, and has wide application prospect in the fields of industrial waste heat recovery, solar thermal power generation and the like.
Specifically, the method comprises the following steps:
1) compared with the corresponding basic molten salt material, the heat transfer and storage material has larger specific heat capacity, energy storage density and heat conductivity;
2) the heat transfer and heat storage material is added with the magnesium oxide nano-particles modified by the carbonate, so that the specific heat capacity is obviously improved, the heat storage/release capacity of the molten salt fluid in a single cycle can be greatly improved, and the pumping power consumption is effectively reduced;
3) the heat transfer and heat storage material is added with the magnesium oxide nano-particles modified by carbonate, so that the heat conductivity coefficient is obviously improved, the heat exchange efficiency of the molten salt can be effectively improved, and the heat preservation energy consumption of a heat storage system is greatly reduced;
4) the heat transfer and heat storage material disclosed by the invention combines the advantages of low melting point and high stability of molten nitrate and the advantages of high specific heat capacity and high heat conductivity coefficient of molten carbonate, so that the heat storage capacity and the flow property of a heat storage system can be greatly improved.
Drawings
Fig. 1 is a graph showing the results of specific heat capacity tests of the heat transfer and storage materials of example 1, comparative example 1, and comparative example 2.
Fig. 2 is a graph showing the results of specific heat capacity tests of the heat transfer and storage materials of example 2, comparative example 3, and comparative example 4.
Fig. 3 is a graph showing the results of particle size tests of the heat transfer and storage materials of example 2 and comparative example 4.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
a heat transfer and storage material is prepared by the following steps:
1) 22.24g of calcium nitrate, 4.41g of sodium nitrate and 23.35g of potassium nitrate were dried and mixed to prepare a calcium nitrate-sodium nitrate-potassium nitrate ternary molten salt, and 6.5g of MgCl was added2·6H2O, after being uniformly mixed, intermittently heating for 30min by adopting an electromagnetic rapid heating method with the heating power of 600W, transferring the material into a muffle furnace, preserving the temperature for 5h at 500 ℃, naturally cooling to room temperature, adding water into the calcined product for dispersing, centrifuging at 8000rpm, repeatedly adding water into the centrifuged solid for dispersing and centrifuging for 5 times, putting the solid obtained by the last centrifugation into an oven, and drying for 12h at 120 ℃ to obtain magnesium oxide nanoparticles (white powder);
2) drying and mixing 16.35g of lithium carbonate, 17g of sodium carbonate and 16.65g of potassium carbonate to prepare lithium carbonate-sodium carbonate-potassium carbonate ternary molten carbonate, adding 1.28g of magnesium oxide nanoparticles, transferring the material into a muffle furnace, preserving the temperature for 3h at 500 ℃, naturally cooling to room temperature, adding water into the calcined product for dispersing, centrifuging at 8000rpm, removing the supernatant 2/3, putting the supernatant into an oven, and drying at 120 ℃ for 12h to obtain magnesium oxide nanoparticles modified by the lithium carbonate-sodium carbonate-potassium carbonate ternary molten carbonate, namely modified magnesium oxide nanoparticles (the particle size is 200-350 nm);
3) mixing 0.5g of modified magnesium oxide nano-particles with 19.5g of calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt obtained in the step 1), transferring the material into a muffle furnace, keeping the temperature at 500 ℃ for 6h, naturally cooling to room temperature, and crushing to obtain the heat transfer and heat storage material (marked as MgO-CNK-C).
Comparative example 1:
a heat transfer and storage material is prepared by the following steps:
and mixing 22.24g of calcium nitrate, 4.41g of sodium nitrate and 23.35g of potassium nitrate to obtain the heat transfer and storage material (marked as CNK).
Comparative example 2:
a heat transfer and storage material is prepared by the following steps:
22.24g of calcium nitrate, 4.41g of sodium nitrate and 23.35g of potassium nitrate were dried and mixed to prepare a calcium nitrate-sodium nitrate-potassium nitrate ternary molten salt, and 6.5g of MgCl was added2·6H2And O, after being uniformly mixed, intermittently heating for 30min by adopting an electromagnetic rapid heating method with the heating power of 600W, transferring the material into a muffle furnace, preserving the heat for 5h at the temperature of 500 ℃, naturally cooling to room temperature, and crushing to obtain the heat transfer and heat storage material (marked as MgO-CNK-S).
And (3) performance testing:
the specific heat capacities (220-400 ℃) of the heat transfer and heat storage materials of example 1, comparative example 1 and comparative example 2 were measured by a differential scanning calorimeter, that is, the specific heat capacities of the heat transfer and heat storage material samples were calculated by measuring the heat flow curve of an empty crucible, the heat flow curve of a sapphire standard sample added to the same crucible and the heat flow curve of the prepared heat transfer and heat storage material sample under the same protective gas flow and temperature rise rate by a standard comparison method, and the test results are shown in fig. 1.
As can be seen from fig. 1: compared with CNK (undoped nano magnesium oxide particles), the specific heat capacity of MgO-CNK-S (in-situ generated magnesium oxide particles) is only improved by 17%, and the specific heat capacity of MgO-CNK-C (firstly in-situ generated nano magnesium oxide particles and then surface modification is carried out on the nano magnesium oxide particles) is improved by 35%.
Example 2:
a heat transfer and storage material is prepared by the following steps:
1) 22.24g of calcium nitrate, 4.41g of sodium nitrate and 23.35g of potassium nitrate were dried and mixed to prepare a calcium nitrate-sodium nitrate-potassium nitrate ternary molten salt, and 6.5g of MgCl was added2·6H2O, after being uniformly mixed, intermittently heating for 30min by adopting an electromagnetic rapid heating method with the heating power of 600W, transferring the material into a muffle furnace, preserving the temperature for 5h at 500 ℃, naturally cooling to room temperature, adding water into the calcined product for dispersing, centrifuging at 8000rpm, repeatedly adding water into the centrifuged solid for dispersing and centrifuging for 5 times, putting the solid obtained by the last centrifugation into an oven, and drying for 12h at 120 ℃ to obtain magnesium oxide nanoparticles (white powder);
2) drying and mixing 16.35g of lithium carbonate, 17g of sodium carbonate and 16.65g of potassium carbonate to prepare lithium carbonate-sodium carbonate-potassium carbonate ternary molten carbonate, adding 1.28g of magnesium oxide nanoparticles, transferring the material into a muffle furnace, preserving the temperature for 3h at 500 ℃, naturally cooling to room temperature, adding water into the calcined product for dispersing, centrifuging at 8000rpm, removing the supernatant 2/3, putting the supernatant into an oven, and drying at 120 ℃ for 12h to obtain magnesium oxide nanoparticles modified by the lithium carbonate-sodium carbonate-potassium carbonate ternary molten carbonate, namely modified magnesium oxide nanoparticles (the particle size is 50-800 nm);
3) drying 26.5g of potassium nitrate, 3.5g of sodium nitrate and 20g of sodium nitrite, mixing to prepare potassium nitrate-sodium nitrite ternary molten nitrate salt, adding 1.28g of modified magnesium oxide nanoparticles, uniformly mixing, transferring the material into a muffle furnace, keeping the temperature at 500 ℃ for 6h, naturally cooling to room temperature, and crushing to obtain the heat transfer and heat storage material (marked as MgO-Hitec-M).
Comparative example 3:
a heat transfer and storage material is prepared by the following steps:
26.5g of potassium nitrate, 3.5g of sodium nitrate and 20g of sodium nitrite were mixed to obtain a heat transfer and storage material (noted as Hitec).
Comparative example 4:
a heat transfer and storage material is prepared by the following steps:
drying and mixing 26.5g potassium nitrate, 3.5g sodium nitrate and 20g sodium nitrite to prepare potassium nitrate-sodium nitrite ternary nitrate molten salt, and adding 6.5g MgCl2·6H2And O, after being uniformly mixed, intermittently heating for 30min by adopting an electromagnetic rapid heating method with the heating power of 600W, transferring the material into a muffle furnace, preserving the heat for 5h at the temperature of 500 ℃, naturally cooling to room temperature, and crushing to obtain the heat transfer and heat storage material (marked as MgO-Hitec).
And (3) performance testing:
1) the specific heat capacities (220-400 ℃) of the heat transfer and heat storage materials of example 2, comparative example 3 and comparative example 4 were measured by a differential scanning calorimeter, that is, the specific heat capacities of the heat transfer and heat storage material samples were calculated by measuring the heat flow curve of an empty crucible, the heat flow curve of a sapphire standard sample added to the same crucible and the heat flow curve of the prepared heat transfer and heat storage material sample under the same protective gas flow and temperature rise rate by a standard comparison method, and the test results are shown in fig. 2.
As can be seen from fig. 2: compared with Hitec (undoped nano magnesium oxide particles), the specific heat capacity of MgO-Hitec (in-situ generated magnesium oxide particles) is only improved by 6%, and the specific heat capacity of MgO-Hitec-M (firstly in-situ generated nano magnesium oxide particles and then surface modification is carried out on the nano magnesium oxide particles) is improved by 10%.
2) The heat transfer and heat storage materials of the example 2 and the comparative example 4 were subjected to particle size analysis using a malvern particle sizer, the specific operation being: 20mg of the heat transfer and storage material is dispersed in 40mL of distilled water, and then an appropriate amount of the dispersion is added into a quartz cuvette for testing, and the test result is shown in FIG. 3 (the right graph in FIG. 3 is a Tyndall effect test chart of the heat transfer and storage material of example 2).
As can be seen from fig. 3: the heat transfer and heat storage material of comparative example 4 has a wide particle size distribution range (600 nm-1000 nm) and insufficiently uniform particles, while the heat transfer and heat storage material of example 2 has a narrow particle size distribution range (400 nm-600 nm) and uniform particles and has an obvious Tyndall effect, which indicates that the size of the modified nano magnesium oxide particles is reduced and the particle size distribution range is narrowed.
3) The results of the energy storage density (E) tests of the heat transfer and storage materials of example 2, comparative example 3 and comparative example 4 are shown in the following table:
table 1 energy storage density test results of heat transfer and storage materials of example 2, comparative example 3 and comparative example 4
As can be seen from Table 1: the heat transfer and storage material of example 2 has the highest energy storage density, which is 16% higher than that of the heat transfer and storage material of comparative example 3.
Example 3:
a heat transfer and storage material is prepared by the following steps:
1) 25g of calcium nitrate, 4.5g of sodium nitrate and 20.5g of potassium nitrate were dried and mixed to prepare a calcium nitrate-sodium nitrate-potassium nitrate ternary molten salt, and 9.19g of MgCl was added2·6H2O, after being uniformly mixed, intermittently heating for 30min by adopting an electromagnetic rapid heating method with the heating power of 600W, transferring the material into a muffle furnace, preserving the temperature for 5h at 500 ℃, naturally cooling to room temperature, adding water into the calcined product for dispersing, centrifuging at 8000rpm, repeatedly adding water into the centrifuged solid for dispersing and centrifuging for 5 times, putting the solid obtained by the last centrifugation into an oven, and drying for 12h at 120 ℃ to obtain magnesium oxide nanoparticles (white powder);
2) drying and mixing 15.75g of lithium carbonate, 17.35g of sodium carbonate and 16.9g of potassium carbonate to prepare lithium carbonate-sodium carbonate-potassium carbonate ternary fused carbonate, adding 1.81g of magnesium oxide nanoparticles, transferring the material into a muffle furnace, preserving the temperature for 3h at 500 ℃, naturally cooling to room temperature, adding water to the calcined product for dispersing, centrifuging at 8000rpm, removing the supernatant 2/3, putting the supernatant into an oven, and drying at 120 ℃ for 12h to obtain magnesium oxide nanoparticles modified by the lithium carbonate-sodium carbonate-potassium carbonate ternary fused carbonate, namely modified magnesium oxide nanoparticles (the particle size is 300-700 nm);
3) mixing 0.7g of modified magnesium oxide nano-particles with 19.3g of calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt obtained in the step 1), transferring the material into a muffle furnace, keeping the temperature at 500 ℃ for 6h, naturally cooling to room temperature, and crushing to obtain the heat transfer and heat storage material (marked as MgO-CNK-C).
Tests prove that the Cp of the heat transfer and heat storage material prepared by the embodiment is 1.57 J.g within the range of 220-400 DEG C-1·K-1～1.65J·g-1·K-1E is 8.9X 105kJ·m-3～9.3×105kJ·m-3。
Example 4:
a heat transfer and storage material is prepared by the following steps:
1) 23.42g of calcium nitrate, 4.21g of sodium nitrate and 22.37g of potassium nitrate were dried and mixed to prepare a calcium nitrate-sodium nitrate-potassium nitrate ternary molten salt, and 11.9g of MgCl was added2·6H2O, after being uniformly mixed, intermittently heating for 30min by adopting an electromagnetic rapid heating method with the heating power of 600W, transferring the material into a muffle furnace, preserving the heat for 6h at 500 ℃, naturally cooling to room temperature, adding water into the calcined product for dispersing, centrifuging at 8000rpm, repeatedly adding water into the centrifuged solid for dispersing and centrifuging for 10 times, putting the solid obtained by the last centrifugation into an oven, and drying for 12h at 120 ℃ to obtain magnesium oxide nanoparticles (white powder);
2) drying and mixing 15.75g of lithium carbonate, 17.35g of sodium carbonate and 16.9g of potassium carbonate to prepare lithium carbonate-sodium carbonate-potassium carbonate ternary fused carbonate, adding 2.36g of magnesium oxide nanoparticles, transferring the material into a muffle furnace, preserving the temperature for 3h at 500 ℃, naturally cooling to room temperature, adding water to the calcined product for dispersing, centrifuging at 8000rpm, removing the supernatant 2/3, putting the supernatant into an oven, and drying at 120 ℃ for 12h to obtain magnesium oxide nanoparticles modified by the lithium carbonate-sodium carbonate-potassium carbonate ternary fused carbonate, namely modified magnesium oxide nanoparticles (the particle size is 300-900 nm);
3) mixing 0.9g of modified magnesium oxide nano-particles with 19.1g of calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt obtained in the step 1), transferring the material into a muffle furnace, preserving the temperature at 500 ℃ for 7 hours, naturally cooling to room temperature, and crushing to obtain the heat transfer and heat storage material (marked as MgO-CNK-T).
After testing, the bookThe Cp of the heat transfer and storage material prepared in the embodiment is 1.62 J.g in the range of 220-400 DEG C-1·K-1～1.70J·g-1·K-1E is 9.1X 105kJ·m-3～9.6×105kJ·m-3。
Example 5:
a heat transfer and storage material is prepared by the following steps:
1) drying 25g of calcium nitrate, 5g of sodium nitrate and 20g of potassium nitrate, mixing to obtain calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt, and adding 13.34g of MgCl2·6H2O, after being uniformly mixed, intermittently heating for 30min by adopting an electromagnetic rapid heating method with the heating power of 600W, transferring the material into a muffle furnace, preserving the heat for 6h at 500 ℃, naturally cooling to room temperature, adding water into the calcined product for dispersing, centrifuging at 8000rpm, repeatedly adding water into the centrifuged solid for dispersing and centrifuging for 10 times, putting the solid obtained by the last centrifugation into an oven, and drying for 12h at 120 ℃ to obtain magnesium oxide nanoparticles (white powder);
2) drying and mixing 15.25g of lithium carbonate, 17.65g of sodium carbonate and 17.1g of potassium carbonate to prepare lithium carbonate-sodium carbonate-potassium carbonate ternary molten carbonate, adding 2.63g of magnesium oxide nanoparticles, transferring the material into a muffle furnace, keeping the temperature for 4 hours at 500 ℃, naturally cooling to room temperature, adding water to the calcined product for dispersing, centrifuging at 8000rpm, removing the supernatant 2/3, putting the supernatant into an oven, and drying at 120 ℃ for 12 hours to obtain magnesium oxide nanoparticles modified by the lithium carbonate-sodium carbonate-potassium carbonate ternary molten carbonate, namely modified magnesium oxide nanoparticles (the particle size is 300-700 nm);
3) mixing 1g of modified magnesium oxide nano-particles with 19g of calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt obtained in the step 1), transferring the material into a muffle furnace, preserving the temperature for 6h at 500 ℃, naturally cooling to room temperature, and crushing to obtain the heat transfer and storage material (marked as MgO-CNK-F).
Tests prove that the Cp of the heat transfer and heat storage material prepared by the embodiment in the range of 220-400 ℃ is 1.68 J.g-1·K-1～1.76J·g-1·K-1E is 9.4X 105kJ·m-3～9.9×105kJ·m-3。
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A heat transfer and storage material, characterized in that: the heat transfer and heat storage material comprises molten nitrate salt and modified magnesium oxide nanoparticles doped in the molten nitrate salt; the modified magnesium oxide nanoparticles comprise magnesium oxide nanoparticles and carbonic acid fused salt modified on the surfaces of the magnesium oxide nanoparticles.
2. A heat transfer and storage material according to claim 1, wherein: the molten nitrate salt is one of calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt, potassium nitrate-sodium nitrite ternary molten nitrate salt and potassium nitrate-sodium nitrate binary molten nitrate salt.
3. A heat transfer and storage material according to claim 2, wherein: the calcium nitrate-sodium nitrate-potassium nitrate ternary molten nitrate salt comprises the following components in percentage by mass: calcium nitrate: 40% -50%; sodium nitrate: 8% -10%; potassium nitrate: 40 to 50 percent.
4. A heat transfer and storage material according to claim 2, wherein: the potassium nitrate-sodium nitrite ternary nitrate molten salt comprises the following components in percentage by mass: potassium nitrate: 50% -60%; sodium nitrate: 5% -10%; sodium nitrite: 35 to 45 percent.
5. A heat transfer and storage material according to claim 2, wherein: the potassium nitrate-sodium nitrate binary molten nitrate salt comprises the following components in percentage by mass: potassium nitrate: 60% -70%; sodium nitrate: 30 to 40 percent.
6. A heat transfer and storage material according to any one of claims 1 to 5, wherein: the carbonate molten salt is lithium carbonate-sodium carbonate-potassium carbonate ternary carbonate molten salt.
7. A heat transfer and storage material according to claim 6, wherein: the lithium carbonate-sodium carbonate-potassium carbonate ternary carbonate molten salt comprises the following components in percentage by mass: lithium carbonate: 30% -33%; sodium carbonate: 30% -40%; potassium carbonate: 30 to 40 percent.
8. The method for preparing the heat transfer and storage material of any one of claims 1 to 7, characterized by comprising the following steps:
1) mixing magnesium chloride and calcium-containing molten nitrate salt, calcining, adding water to the calcined product for dispersing, centrifuging and drying to obtain magnesium oxide nanoparticles;
2) mixing the magnesium oxide nanoparticles with the molten carbonate, calcining, adding water to the calcined product for dispersing, centrifuging and drying to obtain magnesium oxide nanoparticles modified by the molten carbonate, namely modified magnesium oxide nanoparticles;
3) and mixing the modified magnesium oxide nanoparticles with molten nitrate salt, and calcining to obtain the finished product.
9. The method of claim 8 wherein: the calcination of the step 1) is carried out at the temperature of 400-600 ℃, and the heat preservation time is 5-8 h; the calcination in the step 2) is carried out at the temperature of 400-600 ℃, and the heat preservation time is 3-4 h; the calcination in the step 3) is carried out at the temperature of 400-600 ℃, and the heat preservation time is 6-8 h.
10. The heat transfer and storage material of any one of claims 1 to 7 for use in industrial waste heat recovery or solar thermal power generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110985906.3A CN113789161B (en) | 2021-08-26 | 2021-08-26 | Heat transfer and heat storage material and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110985906.3A CN113789161B (en) | 2021-08-26 | 2021-08-26 | Heat transfer and heat storage material and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113789161A true CN113789161A (en) | 2021-12-14 |
| CN113789161B CN113789161B (en) | 2022-08-16 |
Family
ID=78876403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110985906.3A Active CN113789161B (en) | 2021-08-26 | 2021-08-26 | Heat transfer and heat storage material and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113789161B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114410280A (en) * | 2022-01-14 | 2022-04-29 | 北京工业大学 | Low-melting-point wide-temperature-range fused salt composite sizing phase-change material and preparation method thereof |
| CN114436591A (en) * | 2022-01-27 | 2022-05-06 | 深圳市深建混凝土有限公司 | Light recycled concrete and preparation process thereof |
| CN115558472A (en) * | 2022-11-05 | 2023-01-03 | 北京民利储能技术有限公司 | Heat transfer and energy storage molten salt material and preparation method thereof |
| CN115558472B (en) * | 2022-11-05 | 2024-05-03 | 北京民利储能技术有限公司 | Heat-transfer energy-storage molten salt material and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103881662A (en) * | 2013-01-25 | 2014-06-25 | 深圳市爱能森科技有限公司 | Ternary nitric acid nano-molten salt heat transfer and storage medium, preparation method and application thereof |
| CN107033852A (en) * | 2017-05-11 | 2017-08-11 | 北京工业大学 | A kind of low melting point binary nitric acid fused salt mixt nano-fluid |
| CN108003847A (en) * | 2018-01-05 | 2018-05-08 | 华南理工大学 | A kind of high heat conduction MgO doping nitric acid Molten Salt Heat Transfer heat accumulatings and its in-situ synthesized and application |
-
2021
- 2021-08-26 CN CN202110985906.3A patent/CN113789161B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103881662A (en) * | 2013-01-25 | 2014-06-25 | 深圳市爱能森科技有限公司 | Ternary nitric acid nano-molten salt heat transfer and storage medium, preparation method and application thereof |
| CN107033852A (en) * | 2017-05-11 | 2017-08-11 | 北京工业大学 | A kind of low melting point binary nitric acid fused salt mixt nano-fluid |
| CN108003847A (en) * | 2018-01-05 | 2018-05-08 | 华南理工大学 | A kind of high heat conduction MgO doping nitric acid Molten Salt Heat Transfer heat accumulatings and its in-situ synthesized and application |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114410280A (en) * | 2022-01-14 | 2022-04-29 | 北京工业大学 | Low-melting-point wide-temperature-range fused salt composite sizing phase-change material and preparation method thereof |
| CN114436591A (en) * | 2022-01-27 | 2022-05-06 | 深圳市深建混凝土有限公司 | Light recycled concrete and preparation process thereof |
| CN115558472A (en) * | 2022-11-05 | 2023-01-03 | 北京民利储能技术有限公司 | Heat transfer and energy storage molten salt material and preparation method thereof |
| CN115558472B (en) * | 2022-11-05 | 2024-05-03 | 北京民利储能技术有限公司 | Heat-transfer energy-storage molten salt material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113789161B (en) | 2022-08-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113789161B (en) | Heat transfer and heat storage material and preparation method and application thereof | |
| Sang et al. | Enhanced specific heat and thermal conductivity of ternary carbonate nanofluids with carbon nanotubes for solar power applications | |
| CN103881662A (en) | Ternary nitric acid nano-molten salt heat transfer and storage medium, preparation method and application thereof | |
| CN105883780B (en) | A kind of method for preparing high-purity crystalline flake graphite | |
| WO2014114220A1 (en) | Nanometer molten salt heat-transfer and heat-storage medium, preparation method and use thereof | |
| CN106957636B (en) | Fused salt-based carbon nanofluid and preparation method thereof | |
| CN115432993B (en) | Solid heat storage material and preparation method and application thereof | |
| CN108003847A (en) | A kind of high heat conduction MgO doping nitric acid Molten Salt Heat Transfer heat accumulatings and its in-situ synthesized and application | |
| Ezhumalai et al. | Improved thermal energy storage behavior of CuO/palmitic acid composite as phase change material | |
| Song et al. | Investigation on heating behavior during the preparation of SiC crystals by microwave sintering | |
| CN110041895B (en) | Heat storage and transfer material and preparation method thereof | |
| Wang et al. | An innovative process for synthesis of superfine nanostructured Li2TiO3 tritium breeder ceramic pebbles via TBOT hydrolysis–solvothermal method | |
| CN108609652A (en) | A method of preparing Zirconium dioxide nano powder using fused salt | |
| CN106495194B (en) | A kind of method of low temperature preparation alpha-type aluminum oxide superfine powder | |
| CN114180560A (en) | Preparation method of coal-based graphene in molten salt system | |
| Zhang et al. | Effect of bismuth oxide on the thermal storage performance of carbonate/magnesium oxide composite | |
| CN114181665A (en) | High latent heat and medium temperature composite phase change material based on nano heat conduction enhancement and preparation method thereof | |
| CN107445202B (en) | A kind of small size, super-dispersed nano zirconium oxide base coating raw powder's production technology | |
| Liu et al. | Investigation on the micromorphology and thermophysical properties of NaNO3 heat storage materials modified by solution combustion | |
| Cheng et al. | Preparation and properties of in-situ synthesized nanoparticles in NaNO3-KNO3 | |
| CN114806515B (en) | Copper-based composite metal oxide heat storage material and preparation method thereof | |
| CN110980735A (en) | Short flow path, low cost micron WO3Method for preparing high-performance nano WC powder | |
| Li et al. | 5Y–ZrO2 NPs with high dispersity and excellent sintering performance prepared by a novel sol-gel-flux method in the NaCl system | |
| WO2024045201A1 (en) | Alumina ceramic powder with high sintering activity and preparation method therefor | |
| CN108574094A (en) | Negative material and preparation method thereof for lithium ion battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |