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Fused salt phase change heat storage element and preparation method thereof

A technology of phase change heat storage and molten salt, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of high thermal conductivity and low cost

Active Publication Date: 2020-06-26
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the solid molten salt phase change heat storage element in the prior art has the problem that it is difficult to achieve high thermal conductivity and low cost at the same time, and a molten salt phase change heat storage element and its preparation method are provided

Method used

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  • Fused salt phase change heat storage element and preparation method thereof
  • Fused salt phase change heat storage element and preparation method thereof
  • Fused salt phase change heat storage element and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0114] like figure 1 The schematic diagram of the preparation process is shown in:

[0115] (1) NaCl is selected as the molten salt, its melting point is 801°C, and the molten salt ball is prepared by rolling molding, and the density of the molten salt ball after molding is 1.80g / cm 3 , the radius R of the molten salt sphere 1 is 14mm.

[0116] (2) Thermoplastic polyethylene is selected as the organic material, and its viscosity in liquid state is 18000mPa·s. Roll the molten salt ball in the organic material for 10 minutes at 220°C, solidify and form at room temperature, and form a 0.2mm waterproof layer on the surface of the molten salt ball.

[0117] (3) 50 wt% graphite powder is selected to be mixed with cement, and mixed by ball milling at a rotating speed of 300r / min and ball milling time of 30min to obtain a mixed powder. Add water with a water-cement ratio (the mass ratio of water to the mixed powder of "graphite and cement") of 0.3, and mix the mixed powder and wa...

Embodiment 2

[0123] (1) Select NaCl:KCl=50.6:49.4 (molar ratio), its melting point is 657°C, and the molten salt ball is obtained by rolling molding, and the density of the molten salt ball after molding is 1.77g / cm 3 , the size of the molten salt ball is radius R 1 10mm.

[0124] (2) Thermosetting epoxy resin is selected as the organic material, which is composed of 100g E-51 epoxy resin, 50g polyurethane prepolymer and 10g diethylenetriamine, and its viscosity in liquid state is 15000mPa.s. Roll the molten salt ball in the organic material for 10 minutes at room temperature, solidify and form at 60°C, and form a 0.2mm waterproof layer on the surface of the molten salt ball.

[0125] (3) 25wt% graphite powder was selected to be mixed with cement, and mixed by ball milling at a speed of 300r / min and ball milling time of 60min to obtain a mixed powder. Add water with a water-cement ratio (the mass ratio of water to the mixed powder of "graphite and cement") of 0.6, and mix the mixed powde...

Embodiment 3

[0131] (1) Choose Li 2 CO 3 :Na 2 CO 3 :K 2 CO 3 =20:60:20 (mass ratio) is molten salt, its melting point is 550°C, and the molten salt ball is obtained by rolling molding, and the density of the molten salt ball after molding is 1.70g / cm 3 , the radius R of the molten salt sphere 1 15mm.

[0132](2) Thermoplastic polystyrene resin is selected as the organic material, and its viscosity in liquid state is 15000mPa·s. Roll the molten salt ball in the organic material for 15 minutes at 150°C, solidify and form at room temperature, and form a 0.3mm waterproof layer on the surface of the molten salt ball.

[0133] (3) 30 wt% graphite powder was selected to be mixed with cement, and mixed by ball milling at a speed of 200 r / min, and the ball milling time was 60 min, to obtain a mixed powder. Add water with a water-cement ratio (the mass ratio of water to the mixed powder of "graphite and cement") of 0.5, and mix the mixed powder and water evenly to obtain a mixed slurry.

...

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Abstract

The invention discloses a fused salt phase change heat storage element and a preparation method thereof. The fused salt phase change heat storage element is of a core-shell structure and comprises aninner core and an outer shell. Wherein the inner core is a molten salt ball; the shell is made of a carbon-based heat conduction material and cement; wherein the radius of the fused salt ball accountsfor 29%-90% of the radius of the fused salt phase change heat storage element; the sum of the ratio of the radius of the fused salt ball to the radius of the fused salt phase change heat storage element and the ratio of the thickness of the shell to the radius of the fused salt phase change heat storage element is smaller than 100%; wherein the carbon-based heat conduction material accounts for 1.0-50.0% of the total mass of the carbon-based heat conduction material and the cement. The solid-state phase change heat storage element has the advantages of being low in cost, high in heat conduction, simple and safe in process, convenient to operate and suitable for mass production.

Description

technical field [0001] The invention relates to a molten salt phase change heat storage element and a preparation method thereof. Background technique [0002] Renewable energy sources such as solar energy and wind energy have the problems of high volatility and low energy utilization. At the same time, industrial waste heat in industries such as steelmaking and aluminum smelting has problems such as huge total amount, intermittent nature and low utilization rate, which can easily cause huge waste of energy. Medium and high temperature heat storage technology is one of the key technologies to solve these problems, through which heat energy can be stably output. A huge amount of heat will be released during the phase change of molten salt from solid phase to liquid phase. The use of molten salt phase change heat storage technology can greatly increase the heat storage density of the system and reduce the volume of heat storage devices. Therefore, it is of great value to car...

Claims

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Application Information

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IPC IPC(8): C09K5/06C04B28/06
CPCC09K5/063C04B28/06C04B14/024C04B14/026
Inventor 唐忠锋宋金亮刘伟华王建强曹云张鹤耀
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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