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Medium-high temperature mixed molten salt heat storage system with high latent heat and preparation method

A mixed molten salt, medium and high temperature technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of narrow temperature range, and achieve the effects of low cost, good fluidity and simple process

Active Publication Date: 2021-08-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its melting point is mostly around 400°C, and its operating temperature range is relatively narrow. Therefore, it is of great significance to develop a mixed molten salt system with a melting point lower than 400°C and a decomposition temperature of 600-800°C.

Method used

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  • Medium-high temperature mixed molten salt heat storage system with high latent heat and preparation method
  • Medium-high temperature mixed molten salt heat storage system with high latent heat and preparation method
  • Medium-high temperature mixed molten salt heat storage system with high latent heat and preparation method

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preparation example Construction

[0025] A ternary nitric acid molten salt system and a preparation method comprise the following steps.

[0026] S1. Mix 60.00-70.00wt.% sodium nitrate, 25.00-35.00wt.% sodium hydroxide and 5.00-10.00wt.% sodium carbonate in a crucible to obtain a mixture.

[0027] S2. Put the mixture into a muffle furnace for heating, set the heating rate of the muffle furnace to 10°C / min, set the holding temperature of the muffle furnace to 500°C, and set the heat preservation time of the melt in the muffle furnace to 3h.

[0028] S3. Heating and insulating the melt in a muffle furnace to obtain the mixed molten salt solid;

[0029] S4. Take out the mixed molten salt solid in the muffle furnace, place it in a drying box to cool naturally, put the cooled mixed molten salt into the ultrafine pulverizer for pulverization, and obtain 20-200 mesh solids. Said mixed molten salt powder;

[0030] S5. Place the pulverized mixed molten salt powder in a drying oven for constant temperature drying trea...

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Abstract

The invention discloses a preparation method of a medium-high temperature mixed molten salt heat storage system with high latent heat, and a medium-high temperature mixed molten salt heat transfer and storage medium with high latent heat is prepared from the following substances in percentage by mass: 20-80% of NaNO3, 0-30% of Na2CO3 and 10-80% of NaOH, and the mass percentage of Na2CO3 is not 0. The low-melting-point fused salt heat transfer and storage medium has relatively large phase change latent heat, relatively high upper limit temperature and relatively wide working temperature range, has good heat transfer and heat storage performance, and is very suitable for heat transfer and heat storage of medium-high temperature solar photo-thermal power generation.

Description

technical field [0001] The invention belongs to the technical field of heat storage materials, and specifically relates to a preparation method of a medium-high temperature mixed molten salt heat storage system with high latent heat, low melting point, high latent heat, high decomposition temperature and wide working temperature range. Background technique [0002] Concentrating solar high-temperature thermal power generation can be combined with large-scale heat storage technology to generate supercritical carbon dioxide (sCO 2 ) Brayton cycle instead of Rankine cycle can improve energy efficiency. Screening out low-cost, high-stability working fluids with an upper limit of 600-800°C for high-temperature heat transfer and heat storage is very important for greatly reducing the cost of solar high-temperature thermal power generation. [0003] At present, in solar thermal power generation systems, the medium used for heat transfer and heat storage is mainly nitric acid molte...

Claims

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Application Information

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IPC IPC(8): C09K5/12
CPCC09K5/12
Inventor 鹿院卫何聪魏海姣吴玉庭马重芳
Owner BEIJING UNIV OF TECH