CN110776876A - Composite phase-change heat storage material with waste incineration power generation ash as base body and preparation method thereof - Google Patents
Composite phase-change heat storage material with waste incineration power generation ash as base body and preparation method thereof Download PDFInfo
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- CN110776876A CN110776876A CN201910939723.0A CN201910939723A CN110776876A CN 110776876 A CN110776876 A CN 110776876A CN 201910939723 A CN201910939723 A CN 201910939723A CN 110776876 A CN110776876 A CN 110776876A
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Abstract
The invention relates to a composite phase-change heat storage material taking waste incineration power generation soot as a matrix and a preparation method thereof, wherein the composite phase-change heat storage material comprises the following components in parts by mass: 1 part of waste incineration power generation soot, 2-4 parts of inorganic salt and 0.15-0.5 part of graphite. The preparation method of the composite phase-change heat storage material comprises the following steps: weighing inorganic salt and the waste incineration power generation ash, mixing, grinding uniformly, sieving, then doping graphite and mixing uniformly; tabletting the mixture by using a mould, and then demoulding; and putting the pressed sheet into a heating furnace, introducing nitrogen, performing high-temperature sintering, cooling and taking out to obtain the composite phase-change heat storage material. The invention utilizes the waste incineration power generation ash matrix to prepare the phase-change heat storage material, effectively utilizes the waste incineration power generation ash, reduces the environmental pollution, and solves the problems of high cost, unreasonable resource utilization and the like of the existing composite phase-change heat storage material.
Description
Technical Field
The invention relates to a phase-change heat storage material, in particular to a composite phase-change heat storage material taking waste incineration power generation soot as a matrix and a preparation method thereof.
Background
At present, our country has more and more large demand for energy, and the problem of environmental pollution caused by the use of traditional fossil energy is increasingly prominent, so that the improvement of the energy utilization efficiency and the development and utilization of renewable energy are urgent. However, the characteristics of intermittent supply of industrial waste heat and renewable energy source, etc. cause the problem of mismatch between time and space when the waste heat and renewable energy source are used, and the development and application of the waste heat and renewable energy source are severely limited. The phase change heat storage technology developed to solve the above problems becomes one of the important technical means for studying the efficient utilization of clean energy and realizing environmental protection in recent years.
The phase-change heat storage technology is a technology of storing heat energy by using a phase-change heat storage material and releasing heat when the phase-change heat storage material is needed, and by reasonably using the phase-change heat storage technology, the problem of unbalanced energy supply and demand can be well solved, and waste heat resources can be recycled. However, a single phase-change material can be a liquid phase with fluidity in the phase-change process, has the defects of poor chemical stability, easy leakage, poor thermal conductivity and the like, reduces the heat storage effect, and thus limits the application and development of the material. Because of the disadvantages of single phase-change materials, people have begun to prepare composite phase-change heat storage materials to make up for the disadvantages of single phase-change materials.
Chinese patent No. CN107245325A discloses "a medium-high temperature inorganic salt/expanded graphite shaped composite phase change heat storage material and a preparation method thereof", wherein the material is a medium-high temperature shaped composite phase change heat storage material prepared by mixing nitrate and expanded graphite. The method has the disadvantages of complicated preparation method and high preparation cost. Chinese patent No. CN107099275A discloses "a method for preparing a blast furnace slag-based composite phase-change heat storage material", which has the disadvantages of low heat storage density, poor heat conductivity, etc. Chinese patent No. CN108504336A discloses "a phase change heat storage material and a method for preparing the same", which has the disadvantages that the heat transfer oil is easy to deteriorate after long-term use, and the phase change temperature is low, and is only suitable for low-temperature heat storage.
Based on the defects of the prior art, a phase-change heat storage material with low preparation cost and good heat storage performance needs to be developed. With the emphasis of China on energy conservation and environmental protection, the number of waste incineration power plants is rapidly increased, and simultaneously, a large amount of waste incineration ash is generated, so that the environment is seriously polluted, and the land is occupied for landfill. Meanwhile, the waste incineration ash has a large specific surface area, is wide in source and low in price, and if the waste incineration ash is used as a phase-change heat storage material matrix, the industrial waste can be recycled, so that the resource utilization is more reasonable.
Disclosure of Invention
The invention provides a composite phase-change heat storage material using waste incineration power generation soot as a base body and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the composite phase-change heat storage material takes the waste incineration power generation soot as a matrix, and comprises the following components in parts by mass: 1 part of waste incineration power generation soot, 2-4 parts of inorganic salt and 0.15-0.5 part of graphite.
The waste incineration power generation soot is soot collected by dedusting of waste incineration power plant flue gas and mainly comprises CaO and SiO
2And Al
2O
3The particle size is 90 to 180 μm.
The inorganic salt is NaNO
3、KNO
3、Mg(NO
3)
2At least one of (1).
The preparation method of the composite phase-change heat storage material by using the waste incineration power generation soot as the matrix comprises the following steps:
the method comprises the following steps: weighing inorganic salt and the waste incineration power generation ash according to the mass part ratio, mixing, grinding uniformly, sieving, then doping graphite, and mixing uniformly;
step two: tabletting the mixture obtained in the step one by using a mould, and then demoulding;
step three: and (4) putting the pressed sheet obtained in the step two into a heating furnace, introducing nitrogen, performing high-temperature sintering, cooling and taking out to obtain the composite phase-change heat storage material.
When the sieve is sieved in the first step, the mesh number of the sieve is 100-200 meshes.
And in the second step, when the die is used for tabletting, a steel die is adopted, the pressure is 6-15 Mpa, and the pressure maintaining time is 20-30 s.
In the third step, the sintering temperature during the high-temperature sintering treatment is 300-400 ℃, and the heat preservation time is 30-50 min.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention utilizes the waste incineration power generation ash as a substrate to prepare the low-cost phase-change heat storage material, the waste incineration power generation ash has larger specific surface area and has the characteristics of good thermal stability, strong corrosion resistance, wide sources, low price and the like, the waste incineration power generation ash is effectively utilized, the environmental pollution is reduced, and the preparation cost of the phase-change heat storage material can be reduced;
2) the phase-change heat storage material is doped with graphite, and the graphite has good heat conductivity, so that the heat transfer efficiency of the phase-change heat storage material can be increased, and the heat conductivity coefficient is improved by more than 15%.
Detailed Description
The invention relates to a composite phase-change heat storage material using waste incineration power generation soot as a substrate, which comprises the following components in parts by mass: 1 part of waste incineration power generation soot, 2-4 parts of inorganic salt and 0.15-0.5 part of graphite.
The waste incineration power generation soot is soot collected by dedusting of waste incineration power plant flue gas and mainly comprises CaO and SiO
2And Al
2O
3The particle size is 90 to 180 μm.
The inorganic salt is NaNO
3、KNO
3、Mg(NO
3)
2At least one of (1).
The preparation method of the composite phase-change heat storage material by using the waste incineration power generation soot as the matrix comprises the following steps:
the method comprises the following steps: weighing inorganic salt and the waste incineration power generation ash according to the mass part ratio, mixing, grinding uniformly, sieving, then doping graphite, and mixing uniformly;
step two: tabletting the mixture obtained in the step one by using a mould, and then demoulding;
step three: and (4) putting the pressed sheet obtained in the step two into a heating furnace, introducing nitrogen, performing high-temperature sintering, cooling and taking out to obtain the composite phase-change heat storage material.
When the sieve is sieved in the first step, the mesh number of the sieve is 100-200 meshes.
And in the second step, when the die is used for tabletting, a steel die is adopted, the pressure is 6-15 Mpa, and the pressure maintaining time is 20-30 s.
In the third step, the sintering temperature during the high-temperature sintering treatment is 300-400 ℃, and the heat preservation time is 30-50 min.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In this embodiment, the preparation process of the composite phase change heat storage material using the waste incineration power generation soot as the base body is as follows:
1. weighing KNO
3Mixing the waste incineration power generation ash with the waste incineration power generation ash (the mass part ratio of the waste incineration power generation ash to the waste incineration power generation ash is 4:1), grinding the mixture uniformly, sieving the mixture (the mesh number of a screen is 200 meshes), doping graphite into the mixture, and uniformly mixing the mixture and the graphite, wherein the mass part ratio of the mixture to the graphite is 10: 1;
2. and (3) pressing and forming: tabletting the mixture doped with the graphite by using a steel mould, keeping the pressure at 10Mpa for 20s, and then demoulding;
3. and (3) putting the pressed sheet into a heating furnace, introducing nitrogen, and then carrying out high-temperature sintering treatment. The sintering temperature is 350 ℃, and the heat preservation time is 30 min. And taking out after cooling to obtain the composite phase change heat storage material.
The composite phase-change heat storage material prepared by the embodiment has the phase-change enthalpy of 149J/g and the phase-change point of 310 ℃.
Conclusion after use: the waste incineration ash is used as a matrix of the phase-change material, so that the thermal stability is good, and the defect of influencing the continuous use does not occur more than 1200 times of cold-hot circulation.
The heat conductivity coefficient of the phase-change heat storage material is 0.34W/m.K when graphite is not doped, the heat transfer efficiency is obviously improved after the graphite is doped, and the heat conductivity coefficient is 0.41W/m.K and is improved by 20.5 percent.
[ example 2 ]
In this embodiment, the preparation process of the composite phase change heat storage material using the waste incineration power generation soot as the base body is as follows:
1. weighing Mg (NO)
3)
2Grinding the mixture of the waste incineration power generation ash and the waste incineration power generation ash uniformly, sieving the mixture (the mesh number of a screen is 120 meshes), doping graphite, and uniformly mixing, wherein the mass ratio of the mixture to the graphite is 15: 1;
2. and (3) pressing and forming: tabletting the mixture doped with the graphite by using a steel mould, keeping the pressure at 6Mpa for 30s, and then demoulding;
3. and (3) putting the pressed sheet into a heating furnace, introducing nitrogen, and then carrying out high-temperature sintering treatment. The sintering temperature is 400 ℃, and the heat preservation time is 30 min. And taking out after cooling to obtain the composite phase change heat storage material.
The composite phase change heat storage material prepared by the embodiment has the phase change enthalpy of 115J/g and the phase change point of 330 ℃.
Conclusion after use: the waste incineration ash is used as a matrix of the phase-change material, so that the thermal stability is good, and the defect of influencing the continuous use is not caused for more than 1000 times of cold and hot circulation.
When graphite is not doped, the heat conductivity coefficient of the phase-change heat storage material is 0.32W/m.K, the heat transfer efficiency is obviously improved after the graphite is doped, and the heat conductivity coefficient is 0.387W/m.K and is improved by 20.9 percent.
[ example 3 ]
In this embodiment, the preparation process of the composite phase change heat storage material using the waste incineration power generation soot as the base body is as follows:
1. weighing NaNO
3+KNO
3Mixing the mixture (the mixing mass part ratio is 1: 1) with the waste incineration power generation soot (the mixing mass part ratio of the mixture and the waste incineration power generation soot is 2:1), grinding uniformly, sieving (the mesh number of a screen is 100 meshes), doping graphite and mixing uniformly, wherein the mass part ratio of the mixture of the three raw materials to the graphite is 20: 1;
2. and (3) pressing and forming: tabletting the mixture doped with the graphite by using a steel mould, keeping the pressure at 15Mpa for 20s, and then demoulding;
3. and (3) putting the pressed sheet into a heating furnace, introducing nitrogen, performing high-temperature sintering treatment at the sintering temperature of 300 ℃ for 50min, cooling, and taking out to obtain the composite phase-change heat storage material.
The composite phase-change heat storage material prepared by the embodiment has the phase-change enthalpy of 118J/g and the phase-change point of 320 ℃.
Conclusion after use: the waste incineration ash is used as a matrix of the phase change material, so that the thermal stability is good, and the defect of influencing the continuous use does not occur more than 1100 times of cold and hot circulation.
When graphite is not doped, the heat conductivity coefficient of the phase-change heat storage material is 0.36W/m.K, the heat transfer efficiency is obviously improved by doping the graphite, and the heat conductivity coefficient is 0.42W/m.K and is improved by 16.6 percent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The composite phase-change heat storage material using the waste incineration power generation soot as a base body is characterized by comprising the following components in parts by mass: 1 part of waste incineration power generation soot, 2-4 parts of inorganic salt and 0.15-0.5 part of graphite.
2. The incinerator according to claim 1The composite phase-change heat storage material with the burning power generation ash as a base body is characterized in that the waste burning power generation ash is ash collected by dust removal of waste burning power plant flue gas, and the main components of the waste burning power generation ash are CaO and SiO
2And Al
2O
3The particle size is 90 to 180 μm.
3. The composite phase-change heat storage material using waste incineration power generation soot as a base body according to claim 1, wherein the inorganic salt is NaNO
3、KNO
3、Mg(NO
3)
2At least one of (1).
4. The method for preparing the composite phase-change heat storage material using the waste incineration power generation soot as the matrix according to claim 1, comprising the steps of:
the method comprises the following steps: weighing inorganic salt and waste incineration power generation ash according to the mass proportion, mixing, grinding uniformly, sieving, and then doping
Graphite (II)Mixing uniformly;
step two: tabletting the mixture obtained in the step one by using a mould, and then demoulding;
step three: and (4) putting the pressed sheet obtained in the step two into a heating furnace, introducing nitrogen, performing high-temperature sintering, cooling and taking out to obtain the composite phase-change heat storage material.
5. The method for preparing the composite phase-change heat storage material by using the waste incineration power generation soot as the matrix according to claim 4, wherein the mesh number of the screen during the screening in the first step is 100-200 meshes.
6. The method for preparing the composite phase-change heat storage material using the waste incineration power generation soot as the matrix according to claim 4, wherein in the second step, a steel mold is used for pressing the composite phase-change heat storage material into the sheet, the pressure is 6-15 MPa, and the pressure maintaining time is 20-30 s.
7. The method for preparing the composite phase-change heat storage material by using the waste incineration power generation soot as the base body according to claim 4, wherein in the third step, the sintering temperature during the high-temperature sintering treatment is 300-400 ℃, and the heat preservation time is 30-50 min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113480981A (en) * | 2021-07-01 | 2021-10-08 | 中国科学院上海应用物理研究所 | Preparation method of high-temperature phase change heat storage element and heat storage element formed by same |
| CN113512407A (en) * | 2021-04-23 | 2021-10-19 | 中科院过程工程研究所南京绿色制造产业创新研究院 | Fly ash-based shaped molten salt composite phase-change heat storage material and preparation method and application thereof |
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| US20110108758A1 (en) * | 2009-01-20 | 2011-05-12 | Driscoll Joseph A | Method for Making Phase Change Aggregates From a Microencapsulated Phase Change Material Liquid Emulsion |
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Cited By (3)
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| CN113512407A (en) * | 2021-04-23 | 2021-10-19 | 中科院过程工程研究所南京绿色制造产业创新研究院 | Fly ash-based shaped molten salt composite phase-change heat storage material and preparation method and application thereof |
| CN113480981A (en) * | 2021-07-01 | 2021-10-08 | 中国科学院上海应用物理研究所 | Preparation method of high-temperature phase change heat storage element and heat storage element formed by same |
| CN113480981B (en) * | 2021-07-01 | 2023-03-14 | 中国科学院上海应用物理研究所 | Preparation method of high-temperature phase change heat storage element and heat storage element formed by same |
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