CN103289653A - High-thermal-conductivity heat-storing nanometer-particle-mixed molten salt and preparation method thereof - Google Patents
High-thermal-conductivity heat-storing nanometer-particle-mixed molten salt and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the heat-storing field of solar thermal power generation, especially to a high-thermal-conductivity heat-storing nanometer-particle-mixed molten salt, and a preparation method thereof. The molten salt consists of a sold heat-storing molten salt, a dispersant and nanometer particles, wherein the dispersant and the nanometer particles disperse uniformly in the heat-storing molten salt and a eutectiform structure is formed, and the nanometer particles coat the surface of the heat-storing molten salt crystal particle. By adding the nanometer particles into the sold heat-storing molten salt, and by utilizing quantum size effect, surface effect, small size effect and the like possessed by the nanometer particles, the thermal physical property of the molten salt as a heat-storing medium has a substantial change. The preparation method is simple in technological process and low in cost, can help to substantially promote heat conductivity and specific heat capacity of the conventional heat-storing molten salt and substantially improve heat stability of the molten salt in a high temperature section, and can help to promote a heat storage capacity and system security of a concentrating solar power generation system and reduce costs of construction and operation of a power station.
Description
Technical field
The present invention relates to solar energy thermal-power-generating heat accumulation field, particularly a kind of mixing nano particle high thermal conductivity heat accumulation fused salt and preparation method thereof.
Background technology
The solar energy thermal-power-generating technology has obtained development fast in recent years and has paid close attention to widely.Advantages such as wherein concentrating solar power generation system is strong because of its controllability, cost is low more and more are subjected to the attention of countries in the world.Concentrating solar power generation system relies on heat accumulation equipment and realizes lasting operation, and high-temperature molten salt is good because of its thermal stability, and the heat transfer coefficient advantages of higher becomes the first-selection of heat-storage medium.
Shortcomings such as existing high-temperature heat-storage fused salt kind is single, and preparation technology is coarse, and all there is hot operation district poor stability in the while, specific heat capacity is low, temperature fluctuation is big.The upper temperature limit that drops into the fused salt of practical application at present is 600 ℃, in case temperature surpasses SC service ceiling, then fused salt begins to become unstable, reaction slowly can take place, and emit gas, make the fusing point rising of mixture even cause the rotten of fused salt, and then may cause serious accidents such as plugging, booster.
Summary of the invention
At the prior art deficiency, the invention provides a kind of mixing nano particle high thermal conductivity heat accumulation fused salt and preparation method thereof.
A kind of mixing nano particle high thermal conductivity heat accumulation fused salt, this fused salt is made up of commercially available heat accumulation fused salt, dispersion agent and nano particle, wherein dispersion agent and nano particle are dispersed in the heat accumulation fused salt, form the eutectiform structure, and nano particle is coated on heat accumulation fused salt crystal grain surface; Wherein the quality of nano particle is 0.5% ~ 10% of heat accumulation fused salt, and the dispersion agent quality is 5 ~ 10 times of nano particle quality.
Described heat accumulation fused salt is one or more in Nitrates or the chlorination salt heat accumulation fused salt.
Described dispersion agent is commercially available gum arabic powder.
Described nano particle is one or more in carbon nanotube, nano silicon and the nano cupric oxide, and the particle diameter of described nano particle is 10 nm ~ 50 nm.
A kind of mixing nano particle high thermal conductivity heat accumulation molten salt preparation method, its concrete steps are as follows:
(1) it is standby to choose commercially available heat accumulation fused salt;
(2) get nano particle, its quality is 0.5% ~ 10% of heat accumulation fused salt quality, puts into distilled water, fully vibrates with ultrasonator, and nano particle is evenly distributed in solution does not have precipitation;
(3) add dispersion agent in solution, its quality is 3 ~ 10 times of nano particle, fully vibrates with ultrasonator, and it is uniformly dispersed;
(4) in the uniform solution of vibration, add the heat accumulation fused salt, fully vibrate with ultrasonator then, it is fully dissolved;
(5) solution is put into the loft drier evaporate to dryness, made heat accumulation fused salt and nano particle recrystallization, namely obtain a kind of mixing nano particle high thermal conductivity energy storage fused salt after the drying.
Described heat accumulation fused salt is one or more in Nitrates or the chlorination salt heat accumulation fused salt.
Described dispersion agent is commercially available gum arabic powder.
Described nano particle is one or more in carbon nanotube, nano silicon and the nano cupric oxide, and the particle diameter of described nano particle is 10 nm ~ 50 nm.
The frequency of described ultrasonator is not less than 140 Hz.
Evaporate to dryness temperature in the described loft drier during evaporate to dryness is 100 ℃ ~ 200 ℃.
Beneficial effect of the present invention is:
The thermal capacity of heat accumulation fused salt of the present invention significantly improves, and thermal capacitance improves reduces the temperature fluctuation when hot operation of heat accumulation fused salt, can prevent effectively that the heat accumulation fused salt from overtemperature taking place in the working process in pipe and pernicious phenomenon such as solidify; Thermal capacitance raising simultaneously can promote heat accumulation fused salt heat storage capacity, and store heat is more under the situation of equal volume, reduces power plant construction and running cost.In addition, the thermal conductivity of heat accumulation fused salt of the present invention significantly promotes, and thermal conductivity promotes and can make heat exchange effect reinforcement in the interchanger, is conducive to the power station and improves the working parameter power station, promotes generating efficiency.The inventive method technical process is simple, cost is low, can significantly promote thermal conductivity, the specific heat capacity of traditional heat accumulation fused salt, and obviously improves fused salt in the thermostability of high temperature section, heat storage capacity, the security of system of concentrating solar power generation system be can promote, power plant construction and running cost reduced.
Description of drawings
Fig. 1 is the structural representation of heat accumulation fused salt of the present invention.
Embodiment
The invention provides a kind of mixing nano particle high thermal conductivity heat accumulation fused salt and preparation method thereof, the present invention will be further described below in conjunction with the drawings and specific embodiments.
Embodiment 1
A kind of mixing nano particle high thermal conductivity heat accumulation molten salt preparation method, its concrete steps are as follows:
(1) choose commercially available by NaNO
3And KNO
3The heat accumulation fused salt of configuration is standby, wherein NaNO
3Massfraction be 60%, all the other are KNO
3
(2) get multi-walled carbon nano-tubes or metal nanoparticle, its quality is 0.1% ~ 3% of heat accumulation fused salt quality, and particle diameter is 10 nm ~ 50 nm, puts into distilled water, fully vibrates with ultrasonator, and nano particle is evenly distributed in solution does not have precipitation;
(3) in solution, add gum arabic powder, its quality by interpolation multi-walled carbon nano-tubes or metal nanoparticle 3 ~ 5 times, fully vibrate with ultrasonator, it is uniformly dispersed;
(4) in the uniform solution of vibration, add nitro heat accumulation fused salt, fully vibrate with ultrasonator then, it is fully dissolved;
(5) solution is put into loft drier evaporate to dryness under 100 ℃ ~ 200 ℃ temperature, made heat accumulation fused salt and nano particle recrystallization, namely obtain a kind of mixing nano particle high thermal conductivity energy storage fused salt after the drying.
Claims (10)
1. one kind is mixed nano particle high thermal conductivity heat accumulation fused salt, it is characterized in that: this fused salt is made up of commercially available heat accumulation fused salt, dispersion agent and nano particle, wherein dispersion agent and nano particle are dispersed in the heat accumulation fused salt, form the eutectiform structure, nano particle is coated on heat accumulation fused salt crystal grain surface; Wherein the quality of nano particle is 0.5% ~ 10% of heat accumulation fused salt, and the dispersion agent quality is 5 ~ 10 times of nano particle quality.
2. energy storage fused salt according to claim 1, it is characterized in that: described heat accumulation fused salt is one or more in Nitrates or the chlorination salt heat accumulation fused salt.
3. energy storage fused salt according to claim 1, it is characterized in that: described dispersion agent is commercially available gum arabic powder.
4. energy storage fused salt according to claim 1, it is characterized in that: described nano particle is one or more in carbon nanotube, nano silicon and the nano cupric oxide, the particle diameter of described nano particle is 10 nm ~ 50 nm.
5. one kind is mixed nano particle high thermal conductivity heat accumulation molten salt preparation method, it is characterized in that concrete steps are as follows:
(1) it is standby to choose commercially available heat accumulation fused salt;
(2) get nano particle, its quality is 0.5% ~ 10% of heat accumulation fused salt quality, puts into distilled water, fully vibrates with ultrasonator, and nano particle is evenly distributed in solution does not have precipitation;
(3) add dispersion agent in solution, its quality is 3 ~ 10 times of nano particle, fully vibrates with ultrasonator, and it is uniformly dispersed;
(4) in the uniform solution of vibration, add the heat accumulation fused salt, fully vibrate with ultrasonator then, it is fully dissolved;
(5) solution is put into the loft drier evaporate to dryness, made heat accumulation fused salt and nano particle recrystallization, namely obtain a kind of mixing nano particle high thermal conductivity energy storage fused salt after the drying.
6. method according to claim 5, it is characterized in that: described heat accumulation fused salt is one or more in Nitrates or the chlorination salt heat accumulation fused salt.
7. method according to claim 5, it is characterized in that: described dispersion agent is commercially available gum arabic powder.
8. method according to claim 5, it is characterized in that: described nano particle is one or more in carbon nanotube, nano silicon and the nano cupric oxide, the particle diameter of described nano particle is 10 nm ~ 50 nm.
9. method according to claim 5, it is characterized in that: the frequency of described ultrasonator is not less than 140 Hz.
10. method according to claim 5 is characterized in that: the evaporate to dryness temperature in the described loft drier during evaporate to dryness is 100 ℃ ~ 200 ℃.
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| CN103911121A (en) * | 2013-12-26 | 2014-07-09 | 深圳市爱能森科技有限公司 | Nanometer molten binary nitrate heat-transfer heat-storage medium and preparation method thereof |
| CN103911122A (en) * | 2013-12-26 | 2014-07-09 | 深圳市爱能森科技有限公司 | Sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium and its preparation method and use |
| CN103911124A (en) * | 2013-12-26 | 2014-07-09 | 深圳市爱能森科技有限公司 | Sodium silicate-molten ternary nitrate compounded heat-transfer heat-storage medium and its preparation method and use |
| CN103923619A (en) * | 2013-12-26 | 2014-07-16 | 深圳市爱能森科技有限公司 | Molten nano-carbonate heat transfer and accumulation medium, and preparation method and application thereof |
| CN103923612A (en) * | 2013-12-26 | 2014-07-16 | 深圳市爱能森科技有限公司 | Quartz sand compound binary molten nitrate salt heat transfer and storage medium and its preparation method |
| CN103923620A (en) * | 2014-04-15 | 2014-07-16 | 上海交通大学 | Preparation method of heat storage composite material based on nanoparticle electromagnetic wave absorption |
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| CN105154029A (en) * | 2015-10-11 | 2015-12-16 | 郑叶芳 | Nanometer aluminium nitride modified fused salt and preparation method thereof |
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| CN108531142A (en) * | 2018-04-27 | 2018-09-14 | 中国科学院青海盐湖研究所 | Solar light-heat power-generation heat transfer heat storage medium and preparation method thereof |
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