CN113652206A - Calcium-magnesium-based thermochemical adsorption heat storage material and preparation method thereof - Google Patents
Calcium-magnesium-based thermochemical adsorption heat storage material and preparation method thereof Download PDFInfo
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- 238000005338 heat storage Methods 0.000 title claims abstract description 143
- 239000011232 storage material Substances 0.000 title claims abstract description 118
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 81
- 238000001035 drying Methods 0.000 claims abstract description 56
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 33
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 22
- 239000000725 suspension Substances 0.000 claims abstract description 22
- 239000011148 porous material Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract 2
- 239000000843 powder Substances 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 24
- 239000001110 calcium chloride Substances 0.000 claims description 19
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 19
- 239000002808 molecular sieve Substances 0.000 claims description 18
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 12
- 238000009736 wetting Methods 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 238000011056 performance test Methods 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 238000002411 thermogravimetry Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000000113 differential scanning calorimetry Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000013112 stability test Methods 0.000 claims description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
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- 239000011777 magnesium Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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Abstract
The invention discloses a calcium-magnesium-based thermochemical adsorption heat storage material and a preparation method thereof, wherein the material comprises 10-30% of porous material and 42-54% of CaCl by mass ratio228% -36% of MgSO4The preparation method comprises the steps of mixing inorganic salt, grinding porous materials, manufacturing a composite heat storage material suspension, drying the composite heat storage material, pressing the composite heat storage material and detecting the composite heat storage material. The material has the advantages that the material has higher heat storage density, and the heat storage density reaches 1400 kJ/kg; the heat storage material also has better circulation stability, and can still keep the heat storage density above 82% when being circulated for 20 times; can realize sealed long-term heat storage without heat loss under environmental conditions, and can be implementedThe existing heat is stored across seasons and transmitted in long distance.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a calcium-magnesium-based thermochemical adsorption heat storage material and a preparation method thereof.
Background
In recent years, the society has rapidly progressed and brings great troubles to human beings, hot water containing a large amount of waste heat discharged by cooling systems of thermal power plants, nuclear power plants and iron and steel plants and productive wastewater containing a large amount of waste heat discharged by petroleum, chemical industry, paper making and the like cause increasingly serious environmental heat pollution problems, and in areas with the most abundant solar energy resources in China, the total solar radiation amount is 6680 plus 8400MJ/m2 in one year; the heat of the industrial waste heat available every year is equivalent to the heat productivity of 5000 ten thousand tons of standard coal, if the heat energy storage technology can be utilized, the unused or redundant solar energy and the industrial waste heat are stored through some media, and the heat is released when needed to carry out building heating and hot water, so that the consumption of fossil energy can be greatly reduced, and the heat pollution of the environment is reduced.
In the prior art, for example, a modified graphene-based heat conduction enhanced ionic liquid composite phase change heat storage material and a preparation method thereof, the material has the problems of complicated manufacturing mode and complicated working procedure, and the paraffin has enhanced liquidity after phase change, is easy to leak, and the like, for example, in a high-temperature composite phase change heat storage material and a preparation method thereof, the manufacturing method is complicated, the working procedure is complex, the heat conductivity of the phase-change heat storage material is low, the heat transfer storage/release rate is slow, the circulation stability is poor, and the industrial production is not facilitated, and the high-heat-conductivity composite phase-change heat storage material and the preparation method thereof have the advantages that the phase separation phenomenon of the crystalline hydrated salt occurs in the phase-change process to cause the reduction of the heat storage capacity, in addition, various problems are involved, including a decrease in the temperature range of use due to the supercooling phenomenon, a low thermal conductivity, and difficulty in heat release and heat release.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the calcium-magnesium-based thermochemical adsorption heat storage material and the preparation method thereof, so that solar energy and industrial waste heat can be utilized, and the environmental pollution is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a calcium-magnesium based thermochemical adsorption heat storage material comprises, by mass, 10% -30% of a porous material and 42% -54% of CaCl228% -36% of MgSO4。
As an improvement of the technical scheme, the porous material is a 13X molecular sieve or a NaY molecular sieve.
As an improvement of the technical scheme, the method comprises the following steps: mixing inorganic salts, grinding porous materials, manufacturing a composite heat storage material turbid liquid, drying the composite heat storage material, pressing the composite heat storage material, and detecting the composite heat storage material.
As an improvement of the technical scheme, the method comprises the following steps of: adding CaCl2And MgSO4According to the mass ratio of 6:4Then putting the mixture into deionized water to form a new solution, mixing the solution evenly,
step two, grinding the porous material: the dried porous material is ground to a powder,
step three, manufacturing a composite heat storage material suspension: mixing the porous material ground into powder with the solution prepared in the step one according to a certain proportion to prepare calcium-magnesium based suspension,
step four, drying the composite heat storage material: putting the calcium-magnesium-based suspension prepared in the third step into a constant-temperature drying oven, drying to form calcium-magnesium-based powder,
step five, pressing the composite heat storage material: adding a small amount of deionized water into the calcium-magnesium-based powder prepared in the step four for wetting, filling the calcium-magnesium-based powder into a die, pressing the calcium-magnesium-based powder into a round cake-shaped heat storage material by using a tablet press, drying the heat storage material in a constant-temperature drying oven to prepare the calcium-magnesium-based composite heat storage material,
step six, detecting the composite heat storage material: and D, performing adsorption performance test, heat storage performance test and cycle stability test on the calcium-magnesium-based composite heat storage material prepared in the step five.
As an improvement of the technical scheme, the drying temperature of the constant-temperature drying box in the fourth step and the drying temperature of the constant-temperature drying box in the fifth step are 150 ℃, and the drying time is 10 hours.
As an improvement of the technical scheme, in the fifth step, the pressing pressure of the tablet press is 3MPa-8 MPa.
As an improvement of the above technical scheme, in the sixth step, a constant temperature and humidity chamber is used for detecting the adsorption performance of the calcium-magnesium based composite heat storage material.
As an improvement of the above technical scheme, in the sixth step, a thermogravimetric analysis (TG) -Differential Scanning Calorimetry (DSC) comprehensive thermal analyzer is used to detect the heat storage performance of the calcium-magnesium based composite heat storage material.
As an improvement of the above technical solution, in the sixth step, an X-ray diffractometer (XRD) is used to perform phase analysis on the calcium-magnesium based composite heat storage material.
As an improvement of the technical scheme, in the sixth step, a constant temperature and humidity box and a TG-DSC comprehensive thermal analyzer are used for detecting the circulating stability of the calcium-magnesium-based composite heat storage material, and the test times are 20 times.
The invention has the beneficial effects that: the thermochemical heat storage material can store solar energy or industrial waste heat, and the development and application of a high-efficiency heat storage technology can solve the problem of waste heat utilization, reduce the consumption of electric power and fossil energy, and also reduce the heat pollution of the environment, wherein the thermochemical heat storage utilizes the interconversion between heat energy and chemical energy in the reversible chemical reaction process to store energy, the reaction is carried out when renewable heat sources such as solar energy are used for heating to convert the heat energy into chemical energy for storage, the adsorption reaction is carried out when the renewable heat sources are contacted with humid air under certain conditions to release the chemical energy into usable high-quality heat energy, the thermochemical heat storage has higher heat storage density, and the heat storage density reaches 1400 kJ/kg; the heat storage material also has better circulation stability, and can still keep the heat storage density above 82% when being circulated for 20 times; the long-term sealed heat-loss-free heat storage under the environmental condition can be realized, and the long-distance heat transmission can be realized.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing a calcium-magnesium based thermal chemical adsorption heat storage material according to the present invention;
FIG. 2 is MgSO4，CaCl213X molecular sieve, Smix,XoptAnd YoptThe absorption curve of the calcium-magnesium-based composite heat storage material;
FIG. 3 is MgSO4，CaCl213X molecular sieve, Smix,XoptAnd YoptXRD pattern of calcium magnesium based composite heat storage material;
FIG. 4 is MgSO4TG-DSC diagram of (a);
FIG. 5 shows CaCl2TG-DSC diagram of (a);
FIG. 6 is XoptTG-DSC diagram of the calcium-magnesium-based composite heat storage material;
FIG. 7 is YoptTG-DSC diagram of the calcium-magnesium-based composite heat storage material;
FIG. 8 is XoptA cycle stability curve diagram of the calcium magnesium base composite heat storage material;
FIG. 9 is YoptOf calcium-magnesium based composite heat-storage materialsCycle stability plots.
Detailed Description
The invention will be further illustrated with reference to the following specific examples and the accompanying figures 1 to 9:
a calcium-magnesium based thermochemical adsorption heat storage material comprises, by mass, 10% -30% of a porous material and 42% -54% of CaCl228% -36% of MgSO4。
The porous material is 13X molecular sieve or NaY molecular sieve as the improvement of the technical scheme.
As an improvement of the technical scheme, the method comprises the following steps: mixing inorganic salts, grinding porous materials, manufacturing a composite heat storage material turbid liquid, drying the composite heat storage material, pressing the composite heat storage material, and detecting the composite heat storage material.
As an improvement of the technical scheme, the method comprises the following steps of: adding CaCl2And MgSO4Adding into deionized water according to the mass ratio of 6:4 to form a new solution, mixing uniformly,
step two, grinding the porous material: the dried porous material is ground to a powder,
step three, manufacturing a composite heat storage material suspension: mixing the porous material ground into powder with the solution prepared in the step one according to a certain proportion to prepare calcium-magnesium based suspension,
step four, drying the composite heat storage material: putting the calcium-magnesium-based suspension prepared in the third step into a constant-temperature drying oven, drying to form calcium-magnesium-based powder,
step five, pressing the composite heat storage material: adding a small amount of deionized water into the calcium-magnesium-based powder prepared in the step four for wetting, filling the calcium-magnesium-based powder into a die, pressing the calcium-magnesium-based powder into a round cake-shaped heat storage material by using a tablet press, drying the heat storage material in a constant-temperature drying oven to prepare the calcium-magnesium-based composite heat storage material,
step six, detecting the composite heat storage material: and D, performing adsorption performance test, heat storage performance test and cycle stability test on the calcium-magnesium-based composite heat storage material prepared in the step five.
As an improvement of the technical scheme, the drying temperature of the constant-temperature drying box in the fourth step and the drying temperature of the constant-temperature drying box in the fifth step are 150 ℃, and the drying time is 10 hours.
As an improvement of the technical scheme, in the fifth step, the pressing pressure of the tablet press is 3MPa-8 MPa.
As an improvement of the above technical scheme, in the sixth step, a constant temperature and humidity chamber is used for detecting the adsorption performance of the calcium-magnesium based composite heat storage material.
As an improvement of the above technical scheme, in the sixth step, a thermogravimetric analysis (TG) -Differential Scanning Calorimetry (DSC) comprehensive thermal analyzer is used to detect the heat storage performance of the calcium-magnesium based composite heat storage material.
As an improvement of the above technical solution, in the sixth step, an X-ray diffractometer (XRD) is used to perform phase analysis on the calcium-magnesium based composite heat storage material.
As an improvement of the technical scheme, in the sixth step, a constant temperature and humidity box and a TG-DSC comprehensive thermal analyzer are used for detecting the circulating stability of the calcium-magnesium-based composite heat storage material, and the test times are 20 times.
FIG. 2 is MgSO4，CaCl213X molecular sieve, calcium magnesium based mixed salt Smix(mass ratio of CaCl)2：MgSO46: 4) calcium magnesium based complex salt Xopt(mass ratio of CaCl)2：MgSO4: 13X molecular sieve 54: 36: 10) and Yopt(mass ratio of CaCl)2：MgSO4: NaY molecular sieve 48: 32: 20) the adsorption curve of (1) indicates that CaCl is present2The adsorption capacity is the largest, but the liquefaction is most easy to occur, and the liquefaction occurs already at 60min of adsorption; MgSO (MgSO)4The adsorption amount of (b) is lowest; the adsorption capacity is only 0.13g/g after the adsorption is stable; xoptThe adsorption capacity of the catalyst reaches 0.45g/g, which is higher than SmixAdsorption amount of (2) 0.38g/g, YoptHas an adsorption capacity of 0.32g/g, lower than SmixThe amount of adsorption of (3).
FIG. 3 is MgSO4，CaCl213X molecular sieve, Smix,XoptAnd YoptXRD pattern, X of calcium-magnesium based composite heat storage materialoptIn (b) embodies MgSO4、CaCl2With the characteristic peak of 13X molecular sieve, YoptIn (b) embodies MgSO4、CaCl2And characteristic peak of NaY molecular sieve.
FIG. 4 is MgSO4TG-DSC of (2), MgSO is known as4The desorption enthalpy value (i.e., the heat storage density) of (a) is 824.21J/g.
FIG. 5 shows CaCl2TG-DSC of (D) shows CaCl2The desorption enthalpy value (i.e., the heat storage density) of (a) is 1455.6J/g.
FIG. 6 is XoptTG-DSC chart of Ca-Mg-based composite heat storage material, namely XoptThe desorption enthalpy value (i.e., the heat storage density) of (a) is 1415.5J/g.
FIG. 7 is YoptTG-DSC of Ca-Mg based composite heat storage material, namely YoptThe desorption enthalpy value (i.e., the heat storage density) of (a) is 1097J/g.
FIG. 8 is XoptThe circulation stability curve of the calcium-magnesium-based composite heat storage material can be known as XoptAfter 20 cycles, the heat storage density is 82% of the initial value; the mass of adsorption and desorption is increased relative to the initial value, and is kept stable basically, and is greatly reduced when 12 times, and is gradually increased after 14 times, and the adsorption and desorption value is 130% of the initial value, which shows that the adsorption and desorption performance is properly improved in the circulation process.
FIG. 9 is YoptThe circulation stability curve of the calcium-magnesium-based composite heat storage material can be known as YoptAfter 20 cycles, the heat storage density is 80% of the initial value; the mass of adsorption and desorption was first slightly increased relative to the initial value, decreased by a large margin at 9 th time, and then remained substantially steady, at about 63% of the initial adsorption and desorption value.
Specifically, taking a preparation method of a calcium-magnesium-based thermochemical adsorption heat storage material as an example, the first preferable step is entirely:
1. preparing a composite heat storage material suspension: sieving 13X molecular sieve and CaCl2And MgSO4Putting the mixture into deionized water according to the mass ratio of 10:54:36, uniformly mixing to form calcium-magnesium-based suspension,
2. drying the composite heat storage material: putting the calcium-magnesium-based suspension into a constant-temperature drying oven, setting the temperature of the constant-temperature drying oven at 150 ℃, drying for 10 hours to form calcium-magnesium-based powder,
3. pressing the composite heat storage material: adding a small amount of deionized water into calcium-magnesium-based powder for wetting, filling the calcium-magnesium-based powder into a mold, pressing by using a tablet press, setting the pressing pressure to be 3MPa, pressing the calcium-magnesium-based powder into a round cake-shaped heat storage material, putting the heat storage material into a constant-temperature drying box, setting the temperature to be 150 ℃, and drying for 10 hours to obtain the calcium-magnesium-based composite heat storage material, wherein the density of the calcium-magnesium-based composite heat storage material is 1100kg/m3It is named as XoptCalcium magnesium base composite heat storage material.
The second preferred step is entirely:
1. preparing a composite heat storage material suspension: sieving 13X molecular sieve and CaCl2And MgSO4Putting the mixture into deionized water according to the mass ratio of 20:48:32, uniformly mixing to form calcium-magnesium-based suspension,
2. drying the composite heat storage material: putting the calcium-magnesium-based suspension into a constant-temperature drying oven, setting the temperature of the constant-temperature drying oven at 150 ℃, drying for 10 hours to form calcium-magnesium-based powder,
3. pressing the composite heat storage material: adding a small amount of deionized water into calcium-magnesium-based powder for wetting, filling the calcium-magnesium-based powder into a mold, pressing the calcium-magnesium-based powder by using a tablet press, setting the pressing pressure to be 5MPa, pressing the calcium-magnesium-based powder into a cake-shaped heat storage material, putting the heat storage material into a constant-temperature drying box, setting the temperature to be 150 ℃, and drying the heat storage material for 10 hours to obtain the calcium-magnesium-based composite heat storage material with the density of 1155kg/m3It is named as XoptCalcium magnesium base composite heat storage material.
The third preferred step is entirely:
1. preparing a composite heat storage material suspension: sieving 13X molecular sieve and CaCl2And MgSO4Putting the mixture into deionized water according to the mass ratio of 30:42:28, uniformly mixing to form calcium-magnesium-based suspension,
2. drying the composite heat storage material: putting the calcium-magnesium-based suspension into a constant-temperature drying oven, setting the temperature of the constant-temperature drying oven at 150 ℃, drying for 10 hours to form calcium-magnesium-based powder,
3. pressing the composite heat storage material: calcium magnesium base powderAdding a small amount of deionized water into the powder for wetting, loading into a die, pressing with a tablet press under a pressing pressure of 8MPa to obtain a cake-shaped heat storage material, drying at 150 deg.C for 10 hr in a constant temperature drying oven to obtain a calcium-magnesium-based composite heat storage material with a density of 1200kg/m3It is named as XoptCalcium magnesium base composite heat storage material.
The fourth preferred step is entirely:
1. preparing a composite heat storage material suspension: mixing NaY molecular sieve and CaCl2And MgSO4Putting the mixture into deionized water according to the mass ratio of 20:48:32, uniformly mixing to form calcium-magnesium-based suspension,
2. drying the composite heat storage material: putting the calcium-magnesium-based suspension into a constant-temperature drying oven, setting the temperature of the constant-temperature drying oven at 150 ℃, drying for 10 hours to form calcium-magnesium-based powder,
3. pressing the composite heat storage material: adding a small amount of deionized water into calcium-magnesium-based powder for wetting, filling the calcium-magnesium-based powder into a mold, pressing the calcium-magnesium-based powder by using a tablet press, setting the pressing pressure to be 8MPa, pressing the calcium-magnesium-based powder into a round cake-shaped heat storage material, putting the heat storage material into a constant-temperature drying box, setting the temperature to be 150 ℃, and drying the heat storage material for 10 hours to obtain the calcium-magnesium-based composite heat storage material with the density of 1200kg/m3It is named as YoptCalcium magnesium base composite heat storage material.
The above is only a preferred embodiment of the present invention, but the present invention is not limited to the above embodiments, and any similar or equivalent means can achieve the technical effects of the present invention, and the present invention shall fall into the protection scope of the present invention.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (9)
1. A calcium-magnesium-based thermochemical adsorption heat storage material is characterized in that: comprises 10 percent of-30% of porous material, 42% -54% of CaCl228% -36% of MgSO4。
2. The calcium-magnesium based thermochemical adsorption heat storage material of claim 1 wherein: the porous material is a 13X molecular sieve or a NaY molecular sieve.
3. A preparation method of a calcium-magnesium-based thermochemical adsorption heat storage material is characterized by comprising the following steps: the method comprises the following steps: mixing inorganic salts, grinding porous materials, manufacturing a composite heat storage material turbid liquid, drying the composite heat storage material, pressing the composite heat storage material, and detecting the composite heat storage material.
4. The method for preparing the calcium-magnesium based thermal chemical adsorption heat storage material according to claim 3, wherein the method comprises the following steps:
step one, mixing inorganic salt: adding CaCl2And MgSO4Adding into deionized water according to the mass ratio of 6:4 to form a new solution, mixing uniformly,
step two, grinding the porous material: the dried porous material is ground to a powder,
step three, manufacturing a composite heat storage material suspension: mixing the porous material ground into powder with the solution prepared in the step one according to a certain proportion to prepare calcium-magnesium based suspension,
step four, drying the composite heat storage material: putting the calcium-magnesium-based suspension prepared in the third step into a constant-temperature drying oven, drying to form calcium-magnesium-based powder,
step five, pressing the composite heat storage material: adding a small amount of deionized water into the calcium-magnesium-based powder prepared in the step four for wetting, filling the calcium-magnesium-based powder into a die, pressing the calcium-magnesium-based powder into a round cake-shaped heat storage material by using a tablet press, drying the heat storage material in a constant-temperature drying oven to prepare the calcium-magnesium-based composite heat storage material,
step six, detecting the composite heat storage material: and D, performing adsorption performance test, heat storage performance test and cycle stability test on the calcium-magnesium-based composite heat storage material prepared in the step five.
5. The method for preparing the calcium-magnesium based thermal chemical adsorption heat storage material as claimed in claim 4, wherein the method comprises the following steps: and the drying temperature of the constant-temperature drying box in the fourth step and the fifth step is 150 ℃, and the drying time is 10 hours.
6. The method for preparing the calcium-magnesium based thermal chemical adsorption heat storage material as claimed in claim 4, wherein the method comprises the following steps: and the pressure of the pressing by the tablet press in the step five is 3MPa-8 MPa.
7. The method for preparing the calcium-magnesium based thermal chemical adsorption heat storage material as claimed in claim 4, wherein the method comprises the following steps: and sixthly, detecting the adsorption performance of the calcium-magnesium-based composite heat storage material by using a constant temperature and humidity box.
8. The method for preparing the calcium-magnesium based thermal chemical adsorption heat storage material as claimed in claim 4, wherein the method comprises the following steps: and sixthly, detecting the heat storage performance of the calcium-magnesium based composite heat storage material by adopting a thermogravimetric analysis (TG) -Differential Scanning Calorimetry (DSC) comprehensive thermal analyzer.
9. The method for preparing the calcium-magnesium based thermal chemical adsorption heat storage material as claimed in claim 4, wherein the method comprises the following steps: and sixthly, performing phase analysis on the calcium-magnesium based composite heat storage material by using an X-ray diffractometer (XRD).
The method for preparing the calcium-magnesium based thermal chemical adsorption heat storage material as claimed in claim 4, wherein the method comprises the following steps: and step six, detecting the circulation stability of the calcium-magnesium-based composite heat storage material by using a constant temperature and humidity box and a TG-DSC comprehensive thermal analyzer, wherein the test times are 20 times.
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