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A biomorphic silicon carbide ceramic high temperature photothermal storage material

A technology of silicon carbide ceramics and biological forms, applied in the direction of heat exchange materials, ceramic products, chemical instruments and methods, etc., can solve the constraints of renewable energy and high-efficiency utilization of waste heat technology, weak self-adaptive regulation ability, and low energy utilization rate and other problems, to achieve excellent mass transmission capacity, improve energy conversion efficiency, and low toxicity

Active Publication Date: 2022-02-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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Problems solved by technology

Most of the existing solar heat storage systems are surface-type. The solar energy is first absorbed by the surface and converted into heat, and then transmitted to the working fluid. There are many heat transfer links and large heat loss.
The traditional passive waste heat storage system has weak adaptive regulation ability and low energy utilization rate
These bottlenecks have greatly restricted the development of efficient utilization technologies for renewable energy and waste heat!

Method used

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  • A biomorphic silicon carbide ceramic high temperature photothermal storage material
  • A biomorphic silicon carbide ceramic high temperature photothermal storage material
  • A biomorphic silicon carbide ceramic high temperature photothermal storage material

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Embodiment Construction

[0039] Each parameter measuring method in the implementation of the present invention and ratio is:

[0040] 1. Use a laser thermal conductivity meter to measure the thermal conductivity of the material.

[0041] 2. Use DSC to test the latent heat value of the phase change of the material.

[0042] 3. Use DSC to test the specific heat capacity of the material.

[0043] 4. Use a spectrophotometer to test the spectral absorptivity of the material.

[0044] Below with example, the embodiment of the present invention is described further:

[0045] The first step: preparation of biomimetic silicon carbide ceramic skeleton.

[0046] Cut the wood into a cuboid with a length of 70mm, a width of 50mm, and a thickness of 30mm. The cut wood is dried in a drying oven at 70°C for 2-3 days. Place in a tube furnace with nitrogen protection atmosphere, raise the temperature to 500°C at a heating rate of 0.5°C / min, and then raise the temperature to 900~1100°C at a heating rate of 1°C / min ...

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Abstract

The invention provides a biomorphic silicon carbide ceramic high-temperature photothermal storage material and a preparation method thereof. The heat storage material is made of a biomorphic silicon carbide ceramic skeleton and chloride salt. Biomorphic silicon carbide ceramics is a ceramic material produced by high-temperature reaction of molten silicon and charcoal porous precursors. Different wood precursors can obtain silicon carbide ceramic frameworks with different porosity. The phase-change heat storage material is prepared by mixing sodium chloride and potassium chloride in a ball mill uniformly and drying to obtain sodium chloride-potassium eutectic salt. The phase-change heat storage material is coated on the biomorphic silicon carbide ceramic skeleton by vacuum impregnation so that the pores of the ceramic skeleton are filled with the phase-change material, and the biomorphic silicon carbide ceramic high-temperature photothermal storage material can be obtained. The composite material prepared by the invention has excellent characteristics of high thermal conductivity (116 W / mK), high spectral absorption performance (92%), and high heat storage density (453kg / kJ), which is expected to promote the construction of a clean, low-carbon, efficient and safe energy system. develop.

Description

technical field [0001] The invention relates to the field of phase-change heat storage materials, in particular to a heat storage material prepared by compounding biomorphic porous silicon carbide ceramics and chloride salts. Background technique [0002] More than 90% of the world's energy is related to heat in the process of extraction, conversion, transmission and utilization. Heat storage can effectively alleviate the mismatch between thermal energy supply and demand in terms of time, space, and intensity, improve energy utilization, and reduce energy utilization costs. Therefore, it is a key technology for building a clean, low-carbon, efficient and safe energy system! [0003] There are three types of heat storage technologies, among which latent heat and sensible heat technologies are the most researched. However, no matter what kind of technology, there is a problem that it is difficult to balance high heat storage density and high power density. Taking sensible he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/65C04B38/06C04B41/85C09K5/06
CPCC04B35/573C04B38/0675C04B41/85C04B41/009C04B41/5012C09K5/063C04B2235/9607
Inventor 刘向雷徐巧宣益民
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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