CN115322751A - High-temperature phase-change heat storage material for electric heat storage, heat storage brick and preparation method thereof - Google Patents
High-temperature phase-change heat storage material for electric heat storage, heat storage brick and preparation method thereof Download PDFInfo
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- 238000005338 heat storage Methods 0.000 title claims abstract description 106
- 239000011449 brick Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000011232 storage material Substances 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 61
- 239000000843 powder Substances 0.000 claims abstract description 50
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 46
- 239000000203 mixture Substances 0.000 claims abstract description 46
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 24
- 230000008859 change Effects 0.000 claims abstract description 23
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 23
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 19
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 19
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000011159 matrix material Substances 0.000 claims abstract description 13
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005245 sintering Methods 0.000 claims abstract description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 8
- 238000004898 kneading Methods 0.000 claims abstract description 8
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 8
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 7
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 7
- 239000011780 sodium chloride Substances 0.000 claims abstract description 4
- 239000006229 carbon black Substances 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 39
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 22
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 22
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 13
- 229910052878 cordierite Inorganic materials 0.000 claims description 12
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 12
- 230000006872 improvement Effects 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims description 9
- 238000000748 compression moulding Methods 0.000 claims description 9
- 238000007873 sieving Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 239000012778 molding material Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims 1
- 239000010433 feldspar Substances 0.000 claims 1
- 229940072033 potash Drugs 0.000 claims 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims 1
- 235000015320 potassium carbonate Nutrition 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 description 10
- 238000004321 preservation Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012782 phase change material Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
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
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
-
- 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
Abstract
The invention discloses a high-temperature phase-change heat storage material for electric heat storage, a heat storage brick and a preparation method thereof. The high-temperature phase change heat storage material for electric heat storage comprises a matrix component, a phase change medium and a bonding component; the mass ratio of the matrix component to the phase change medium to the binding component is (25-65): (20-58): (0.1-9); the matrix component is one or a mixture of more of magnesium hydroxide powder, magnesium oxide powder, magnesium carbonate powder and white carbon black; the phase change medium is one or a mixture of more of sodium carbonate, sodium chloride, lithium carbonate and barium carbonate; after the processes of mixing and blending, kneading, press forming and the like of all the components, the phase change heat storage brick prepared by the invention can realize the sintering of the materials in the primary heating use process of the electric heat storage device, has the advantages of simple production, low preparation cost, flexible application, high heat storage capacity and the like, and has wide application prospect in the field of electric heat storage.
Description
Technical Field
The invention belongs to the field of energy storage materials, and particularly relates to a high-temperature phase change heat storage material for low-cost non-fired electric heat storage, a heat storage brick and a preparation method thereof.
Background
In order to reduce the electricity abandonment rate of wind power photovoltaic power generation in China and solve the problem of atmospheric pollution caused by coal-fired and gas-fired heating in winter in northern areas, a plurality of policies are issued in China to promote the development of energy storage technology and the replacement of clean heating electric energy, the novel energy storage technology represented by phase-change electric heat storage can effectively adjust the contradiction between energy supply and demand mismatching, and the energy storage system is an important composition and development direction of a future energy system.
The phase-change heat storage material is the core of the phase-change electric heat storage technology and is the key for realizing high-efficiency storage and release of the electric heat storage device, so that higher requirements are provided for the heat storage density, the heat conductivity coefficient, the stability and the cost of the electric heat storage device, and the electric heat storage device occupies a larger part in the heat storage technology, so that the research on the heat storage material with low cost, high heat storage density and high heat conductivity has great significance.
The high-temperature composite phase-change heat storage material is used as an energy conversion and storage material, has the advantages of wide use temperature range, high heat storage capacity and the like, and can be widely applied to the fields of civil heating, industrial and commercial heat consumption, renewable energy consumption, power grid frequency modulation and the like.
At present, common high-temperature solid-state heat storage materials for electric heat storage such as magnesia bricks and inorganic salt composite phase change materials are prepared by sintering, the sintering temperature is high, the sintering time is long, a large amount of energy is consumed in the process, the energy is not favorably saved, the emission is reduced, the cost of the heat storage materials is increased, and the popularization and the application are not favorably realized.
Disclosure of Invention
The invention provides a low-cost non-fired high-temperature phase-change heat storage material for electric heat storage, a heat storage brick and a preparation method thereof, aiming at the problems of high production energy consumption, long preparation process time and insufficient flexibility in use of the conventional high-temperature solid-state heat storage material for electric heat storage.
Therefore, the invention adopts the following technical scheme: a high-temperature phase-change heat storage material for electrical heat storage, comprising a matrix component, a phase-change medium and a binding component;
the mass ratio of the matrix component to the phase change medium to the binding component is (25-65): (20-58): (0.1-9);
the matrix component is one or a mixture of more of magnesium hydroxide powder, magnesium oxide powder, magnesium carbonate powder and white carbon black;
the phase change medium is one or a mixture of more of sodium carbonate, sodium chloride, lithium carbonate and barium carbonate.
Furthermore, the powder particle size of the matrix component is 40-200 μm.
Further, the phase change temperature of the phase change medium is adjusted according to the highest use temperature and the heat storage and release rate of the electric heat storage device, and the temperature range is adjusted to be 500-860 ℃.
Further, the binding component is one or a mixture of more of cordierite, diatomite, sodium silicate, potassium feldspar and bismuth oxide.
The invention also provides a high-temperature phase-change heat storage brick for electric heat storage, which comprises the high-temperature phase-change heat storage material for electric heat storage.
The phase-change heat storage material prepared by the invention can realize sintering of the material in the primary heating use process of the electric heat storage device, has the advantages of simple production, low preparation cost, flexible application, high heat storage capacity and the like, and has wide application prospect in the field of electric heat storage.
The invention also provides a preparation method of the high-temperature phase change heat storage brick for electric heat storage, which comprises the following steps:
1) Mixing the matrix component and the phase change medium to form a first mixture;
2) Mixing the first mixture with a bonding component to form a second mixture which is uniformly mixed;
3) And adding water into the second mixture, stirring and kneading, sieving and granulating, then carrying out compression molding in a mold to obtain a molding material, aging the molding material to obtain the high-temperature phase change heat storage brick for electric heat storage, and then sintering the heat storage brick by using the electric heat storage device for the first heating.
Further, in the step 3), the water is added, stirred and kneaded, namely, 8-24% by mass of water is added, and stirred and kneaded for 10-30min; the sieving is to sieve the kneaded raw materials by a raw material particle size of 20 meshes; the molding pressure of the compression molding is 15-40Mpa; the aging treatment is drying for 4-6 h at 25-100 ℃; the sintering temperature is 500-860 ℃.
Further, the second mixture is fused magnesia powder, magnesium hydroxide powder, sodium carbonate, barium carbonate, potassium feldspar and bismuth oxide, and the mass ratio of the fused magnesia powder, the magnesium hydroxide powder, the sodium carbonate, the barium carbonate, the potassium feldspar and the bismuth oxide is 29;
in the step 3), the first heating and using process of the electric heat storage device is as follows: heating for 4h from normal temperature to 100 ℃, keeping the temperature for 2h at 100 ℃, heating for 4h from 100 ℃ to 400 ℃, keeping the temperature for 3h at 400 ℃, heating for 6h from 400 ℃ to 860 ℃, keeping the temperature for 2h at 860 ℃, then cooling, cooling for 16h from 860 ℃ to 150 ℃, and then naturally cooling to room temperature, namely finishing the structural strength improvement of the heat storage brick while carrying out a heat accumulator oven test.
Further, the second mixture material is electrofused magnesia powder, magnesium carbonate powder, sodium carbonate, lithium carbonate, cordierite and bismuth oxide, and the mass ratio of the electrofused magnesia powder, magnesium carbonate powder, sodium carbonate, lithium carbonate, cordierite and bismuth oxide is 35;
in the step 3), the first heating and using process of the electric heat storage device is as follows: heating for 4h from normal temperature to 100 ℃, keeping the temperature at 100 ℃ for 2h, keeping the temperature at 100 h to 400 ℃ for 4h, keeping the temperature at 400 ℃ for 3h, heating for 5h from 400 ℃ to 780 ℃, keeping the temperature at 780 ℃ for 1.5h, then starting cooling, cooling for 12h from 780 ℃ to 150 ℃, and then naturally cooling to room temperature, namely completing the structural strength improvement of the heat storage brick while carrying out a heat accumulator furnace baking test.
Furthermore, the second mixture is electric smelting magnesium oxide powder, magnesium hydroxide powder, sodium carbonate, potassium feldspar, sodium silicate and bismuth oxide, and the mass ratio of the electric smelting magnesium oxide powder, the magnesium hydroxide powder, the sodium carbonate, the potassium feldspar, the sodium silicate and the bismuth oxide is 33;
in the step 3), the first heating and using process of the electric heat storage device is as follows: heating for 4h from normal temperature to 100 ℃, keeping the temperature at 100 ℃ for 2h, keeping the temperature at 4h from 100 ℃ to 400 ℃, keeping the temperature at 400 ℃ for 3h, keeping the temperature at 6h from 400 ℃ to 850 ℃, keeping the temperature at 850 ℃ for 2h, then cooling, cooling for 16h from 860 ℃ to 150 ℃, and then naturally cooling to room temperature, namely, completing the structural strength improvement of the heat storage brick while performing a heat accumulator oven test.
Further, the second mixture is fused magnesia powder, sodium carbonate, lithium carbonate, potassium feldspar and bismuth oxide, and the mass ratio of the fused magnesia powder to the sodium carbonate to the lithium carbonate to the potassium feldspar to the bismuth oxide is 40;
in the step 3), the first heating and using process of the electric heat storage device is as follows: heating for 4h from normal temperature to 100 ℃, keeping the temperature for 2h at 100 ℃, heating for 4h from 100 ℃ to 400 ℃, keeping the temperature for 3h at 400 ℃, keeping the temperature for 4h from 400 ℃ to 550 ℃, keeping the temperature for 2h at 550 ℃, then cooling, cooling for 10h from 550 ℃ to 150 ℃, and then naturally cooling to room temperature, namely finishing the structural strength improvement of the heat storage brick while carrying out a heat accumulator oven test.
Furthermore, the second mixture is magnesium hydroxide powder, barium carbonate, lithium carbonate, cordierite and diatomite, and the mass ratio of the magnesium hydroxide powder to the barium carbonate to the lithium carbonate to the cordierite to the diatomite is 46;
in the step 3), the first heating and using process of the electric heat storage device is as follows: heating for 4h from normal temperature to 100 ℃, keeping the temperature at 100 ℃ for 2h, heating for 4h from 100 ℃ to 360 ℃, keeping the temperature at 360 ℃ for 2h, heating for 3h from 360 ℃ to 620 ℃, keeping the temperature at 620 ℃ for 2h, then cooling, cooling for 10h from 620 ℃ to 150 ℃, and then naturally cooling to room temperature, namely, finishing the structural strength improvement of the heat storage brick while performing a heat accumulator oven test.
The invention has the following beneficial effects: according to the invention, a series of composite phase change heat storage material formulas with different use temperatures are formed by utilizing the phase diagram principle that the phase change melting point of a multi-element inorganic salt mixture changes along with the component proportion, and the modes of phase change component proportion regulation, sintering aid matching regulation and the like, so that the flexible change of the temperature at the demand end of the heat storage device can be realized, the material reinforcement of the heat storage brick is completed in the device by skillfully utilizing the temperature rise curve of the heat storage device in the first temperature rise use stage, and the low-cost and high-efficiency preparation and application of the heat storage material are realized.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not indicate specific experimental procedures or conditions, and can be performed according to the procedures or conditions of the conventional experimental procedures described in the literature in the field.
Example 1
The embodiment is a preparation method of a high-temperature phase-change heat storage brick for electric heat storage, which comprises the following steps:
(1) And uniformly mixing the fused magnesium oxide powder, the magnesium hydroxide powder, sodium carbonate and barium carbonate to form a first mixture.
(2) Mixing the first mixture with potassium feldspar and bismuth oxide to form a second mixture, wherein the mass ratio of the electrofused magnesia powder, the magnesium hydroxide powder, the sodium carbonate, the barium carbonate, the potassium feldspar and the bismuth oxide is 29.
(3) Adding 20% of water into the second mixture by mass of the second mixture, stirring and kneading for 20min, and then sieving by a 20-mesh sieve to form a kneaded material.
(4) Pressing and molding the kneaded material under 25Mpa for 30s of pressure maintaining time; then aged at 25 ℃ for 4h.
(5) The method comprises the steps of forming a heat accumulator structure by using a regular heat accumulation brick which is subjected to compression molding according to the design requirement of the heat accumulator structure, starting heating operation after the heat accumulator is subjected to preparation work such as electrical control, setting a heating curve to be 4h, heating from normal temperature to 100 ℃, keeping the temperature at 100 ℃ for 2h, heating from 100 ℃ to 400 ℃, keeping the temperature at 400 ℃ for 3h, heating from 400 ℃ to 860 ℃ and keeping the temperature at 860 ℃ for 2h, then starting cooling, cooling from 860 ℃ to 150 ℃ for 16h, and then naturally cooling to room temperature, thus finishing structural strength improvement of the heat accumulation brick while performing a heat accumulator furnace baking test.
Example 2
The embodiment is a preparation method of a high-temperature phase change heat storage brick for electric heat storage, which comprises the following steps:
(1) And uniformly mixing the fused magnesia powder, the magnesium carbonate powder, the sodium carbonate and the lithium carbonate to form a first mixture.
(2) Mixing the first mixed material with cordierite and bismuth oxide to form a second mixed material, wherein the mass ratio of the electrofused magnesia powder, the magnesium carbonate powder, the sodium carbonate, the lithium carbonate, the cordierite and the bismuth oxide is 35.5.
(3) Adding 23% of water into the second mixture by mass of the second mixture, stirring and kneading for 30min, and then sieving by a 20-mesh sieve to form a kneaded material.
(4) Pressing and molding the kneaded material under 20Mpa for 30s of pressure maintaining time; then aged at 25 ℃ for 4h.
(5) The method comprises the steps of forming a heat accumulator structure by using a regular heat accumulation brick which is subjected to compression molding according to the design requirement of the heat accumulator structure, starting heating operation after the heat accumulator is subjected to preparation work such as electrical control, heating the temperature to 100 ℃ from normal temperature for 4 hours, insulating the temperature to 100 ℃ for 2h, heating the temperature to 400 ℃ for 4h, insulating the temperature to 400 ℃ for 3h, heating the temperature to 780 ℃ for 5h, insulating the temperature to 780 ℃ for 1.5h, then starting cooling, cooling the temperature to 150 ℃ from 780 ℃ for 12h, and then naturally cooling the temperature to room temperature, thus finishing structural strength improvement of the heat accumulation brick while performing a heat accumulator oven test.
Example 3
The embodiment is a preparation method of a high-temperature phase-change heat storage brick for electric heat storage, which comprises the following steps:
(1) The electric melting magnesium oxide powder, the magnesium hydroxide powder and the sodium carbonate are uniformly mixed to form a first mixture.
(2) Mixing the first mixture with potassium feldspar, sodium silicate and bismuth oxide to form a second mixture, wherein the mass ratio of the electric smelting magnesium oxide powder, the magnesium hydroxide powder, the sodium carbonate, the potassium feldspar, the sodium silicate and the bismuth oxide is 33.
(3) Adding 22% of water into the second mixture by mass of the second mixture, stirring and kneading for 25min, and then sieving by a 20-mesh sieve to form a kneaded material.
(4) Pressing and molding the kneaded material under 25Mpa for 30s; then aged at 25 ℃ for 4h.
(5) The method comprises the steps of forming a heat accumulator structure by using the regular heat accumulation bricks which are subjected to compression molding according to the design requirements of the heat accumulator structure, starting heating operation after the heat accumulator is subjected to preparation work such as electrical control, heating the temperature to 100 ℃ from normal temperature for 4h, keeping the temperature at 100 ℃ for 2h, heating the temperature at 100 ℃ to 400 ℃ for 4h, keeping the temperature at 400 ℃ for 3h, heating the temperature at 400 ℃ to 850 ℃ for 6h, keeping the temperature at 850 ℃ for 2h, then starting cooling, cooling the temperature at 850 ℃ to 150 ℃ for 16h, and then naturally cooling the temperature to room temperature, so that the structural strength of the heat accumulation bricks can be improved while the heat accumulator furnace baking test is carried out.
Example 4
The embodiment is a preparation method of a high-temperature phase-change heat storage brick for electric heat storage, which comprises the following steps:
(1) And uniformly mixing the fused magnesia powder, the sodium carbonate and the lithium carbonate to form a first mixture.
(2) Mixing the first mixture with potassium feldspar and bismuth oxide to form a second mixture, wherein the mass ratio of the electro-fused magnesia powder, sodium carbonate, lithium carbonate, potassium feldspar and bismuth oxide is 40.
(3) Adding 18% of water into the second mixture by mass of the second mixture, stirring and kneading for 25min, and then sieving by a 20-mesh sieve to form a kneaded material.
(4) Pressing and molding the kneaded material under 20Mpa for 30s; then aged at 25 ℃ for 4h.
(5) The method comprises the steps of forming a heat accumulator structure by a regular heat accumulation brick which is subjected to compression molding according to the design requirement of the heat accumulator structure, starting heating operation after the heat accumulator is subjected to preparation work such as electrical control and the like, setting a heating temperature rise curve to be 4h for heating from normal temperature to 100 ℃,100 ℃ for heat preservation 2h,4h for heating from 100 ℃ to 400 ℃,400 ℃ for heat preservation 3h,4h for heating from 400 ℃ to 550 ℃,550 ℃ for heat preservation for 2h, then starting cooling, and 10h for cooling from 550 ℃ to 150 ℃, then naturally cooling to room temperature, thus finishing structural strength improvement of the heat accumulation brick while performing a heat accumulator furnace baking test.
Example 5
The embodiment is a preparation method of a high-temperature phase-change heat storage brick for electric heat storage, which comprises the following steps:
(1) Magnesium hydroxide powder, barium carbonate and sodium chloride are uniformly mixed to form a first mixture.
(2) Mixing the first mixed material with cordierite and diatomite to form a second mixed material, wherein the mass ratio of magnesium hydroxide powder, barium carbonate, lithium carbonate, cordierite to diatomite is (46).
(3) Adding 16% of water into the second mixture by mass of the second mixture, stirring and kneading for 25min, and then sieving by a 20-mesh sieve to form a kneaded material.
(4) Pressing and molding the kneaded material under 18Mpa for 30s of pressure maintaining time; then aging for 4h at 25 ℃;
(5) The method comprises the steps of forming a heat accumulator structure by using regular heat accumulation bricks which are subjected to compression molding according to the design requirements of the heat accumulator structure, starting heating operation after the heat accumulator is subjected to preparation work such as electrical control, setting a heating curve to be 4h for heating from normal temperature to 100 ℃, setting a heating curve to be 100 ℃ for heat preservation 2h, setting a heating curve to be 4h for heating from 100 ℃ to 360 ℃, setting a heating curve to be 360 ℃ for heat preservation 2h, setting a heating curve to be 360 h for heating from 360 ℃ to 620 ℃, setting a heating curve to be 620 ℃ for heat preservation for 2h, then starting cooling, setting a temperature to be 150 ℃ from 620 ℃ for cooling, and then naturally cooling to room temperature, thus the structural strength of the heat accumulation bricks can be improved while a heat accumulator furnace baking test is carried out.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (10)
1. The high-temperature phase-change heat storage material for electric heat storage is characterized by comprising a matrix component, a phase-change medium and a bonding component;
the mass ratio of the matrix component to the phase change medium to the binding component is (25-65): (20-58): (0.1-9);
the matrix component is one or a mixture of more of magnesium hydroxide powder, magnesium oxide powder, magnesium carbonate powder and white carbon black;
the phase change medium is one or a mixture of more of sodium carbonate, sodium chloride, lithium carbonate and barium carbonate.
2. A high temperature phase change heat storage material for electrical storage according to claim 1 wherein the particle size of the matrix component is 40-200 μm.
3. The high-temperature phase-change heat storage material for electric heat storage according to claim 1 or 2, wherein the phase-change temperature of the phase-change medium is adjusted in a range of 500 ℃ to 860 ℃ in accordance with the maximum use temperature and the heat storage and release rate of the electric heat storage device.
4. The high-temperature phase-change heat storage material for electric heat storage according to claim 1 or 2, wherein the binding component is one or a mixture of cordierite, diatomite, sodium silicate, potash feldspar and bismuth oxide.
5. A high-temperature phase-change heat storage brick for electric heat storage, characterized by comprising the high-temperature phase-change heat storage material for electric heat storage of any one of claims 1 to 4.
6. The method for preparing the high-temperature phase-change heat storage brick for electric heat storage according to claim 5, comprising the following steps:
1) Mixing a matrix component and a phase change medium to form a first mixture;
2) Mixing the first mixture with a bonding component to form a second mixture which is uniformly mixed;
3) And adding water into the second mixture, stirring and kneading, sieving and granulating, then carrying out compression molding in a mold to obtain a molding material, aging the molding material to obtain the high-temperature phase change heat storage brick for electric heat storage, and then sintering the heat storage brick by using the electric heat storage device for the first heating.
7. The preparation method according to claim 6, wherein in the step 3), the water is added and stirred and kneaded, wherein 8-24% by mass of water is added and stirred and kneaded for 10-30min; the sieving is to sieve the kneaded raw materials by a raw material particle size of 20 meshes; the molding pressure of the compression molding is 15-40Mpa; the aging treatment is drying for 4 to 6 hours at a temperature of between 25 and 100 ℃; the sintering temperature is 500-860 ℃.
8. The preparation method according to claim 6, wherein the second mixture is fused magnesia powder, magnesium hydroxide powder, sodium carbonate, barium carbonate, potassium feldspar and bismuth oxide, and the mass ratio of the fused magnesia powder, the magnesium hydroxide powder, the sodium carbonate, the barium carbonate, the potassium feldspar and the bismuth oxide is 29;
in the step 3), the first heating and using process of the electric heat storage device is as follows: heating for 4h from normal temperature to 100 ℃, keeping the temperature for 2h at 100 ℃, heating for 4h from 100 ℃ to 400 ℃, keeping the temperature for 3h at 400 ℃, heating for 6h from 400 ℃ to 860 ℃, keeping the temperature for 2h at 860 ℃, then cooling, cooling for 16h from 860 ℃ to 150 ℃, and then naturally cooling to room temperature, namely finishing the structural strength improvement of the heat storage brick while carrying out a heat accumulator oven test.
9. The preparation method according to claim 6, wherein the second mixture material is electrofused magnesia powder, sodium carbonate, lithium carbonate, potassium feldspar and bismuth oxide, and the mass ratio of the electrofused magnesia powder, the sodium carbonate, the lithium carbonate, the potassium feldspar and the bismuth oxide is 40;
in the step 3), the first heating and using process of the electric heat storage device is as follows: heating for 4h from normal temperature to 100 ℃, keeping the temperature at 100 ℃ for 2h, keeping the temperature at 4h from 100 ℃ to 400 ℃, keeping the temperature at 400 ℃ for 3h, keeping the temperature at 400 ℃ for 4h from 400 ℃ to 550 ℃, keeping the temperature at 550 ℃ for 2h, then starting cooling, cooling for 10h from 550 ℃ to 150 ℃, and then naturally cooling to room temperature, namely, completing the structural strength improvement of the heat storage brick while carrying out a heat accumulator oven test.
10. The preparation method according to claim 6, wherein the second mixture is magnesium hydroxide powder, barium carbonate, lithium carbonate, cordierite and diatomite, and the mass ratio of the magnesium hydroxide powder, barium carbonate, lithium carbonate, cordierite and diatomite is 46;
in the step 3), the first heating and using process of the electric heat storage device is as follows: heating for 4h from normal temperature to 100 ℃, keeping the temperature for 2h at 100 ℃, heating for 4h from 100 ℃ to 360 ℃, keeping the temperature for 2h at 360 ℃, heating for 3h from 360 ℃ to 620 ℃, keeping the temperature for 2h at 620 ℃, then cooling, cooling for 10h from 620 ℃ to 150 ℃, and then naturally cooling to room temperature, namely finishing the structural strength improvement of the heat storage brick while carrying out a heat accumulator oven test.
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