A preparation method of high-efficiency heat storage unit based on hierarchical porous ceramics

Abstract

The invention relates to a preparation method of a high-efficiency heat storage unit based on graded hole ceramics, which is characterized in that it includes the following steps: 1) designing graded hole structure parameters: designing and selecting graded hole structure parameters according to Murray's law, a complete graded hole The structural heat storage unit is composed of multi-level holes, and each level of holes is divided into k n Secondary holes, the relationship between the aperture D of each level of holes satisfies Murray's law (D n 3 =k n ·D n+1 3 ); 2) preparation of grade hole ceramic matrix: with cermet TiB 2 Powder is the main raw material, and 1~3wt% Si is added 3 N 4 , using ceramic 3D printing to form a ceramic body with a hierarchical pore structure, and firing it at 1600-1750°C in an argon atmosphere to obtain a ceramic matrix with a hierarchical pore structure; 3) Building a heat storage unit: using the above-mentioned ceramic matrix with a hierarchical pore structure as a skeleton, It is filled with molten salt or alloy with a phase transition temperature of 500°C to 700°C, and packaged to obtain a high-efficiency heat storage unit based on hierarchical porous ceramics. The heat storage unit prepared by the method has the advantages of high heat storage density and high heat transfer and heat exchange efficiency.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency heat storage unit based on hierarchical porous ceramics, which is mainly used in various heat storage fields such as heating, and belongs to the energy field. Background technique [0002] Hierarchical pore structure substances existing in nature have become a research hotspot because of their efficient material and energy transmission and exchange capabilities. Hierarchical pore structure was first discovered in living organisms (such as blood vessels, plant rhizomes, etc.), and hierarchical pore structure materials are formed by the joint construction of three aspects: pore structure level, morphology structure level, and component composition level. At present, some work has been carried out on the preparation and application of graded pore materials at home and abroad. For example, the Chinese invention patent "Preparation Method of Y-type Molecular Sieve with Graded Pore Structure"...

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Problems solved by technology

Chinese invention patent "corundum-mullite honeycomb ceramic regenerator" (CN102399082B) discloses a corundum-mullite honeycomb ceramic regenerator prepared from corundum, mullite, alumina and clay; Chinese invention The patent "A Method of Using Graphite Tailings to Prepare Honeycomb Ceramic Heat Storage Body" (CN201710212094.2) uses solid waste graphite tailings as the main raw material to prepare a low-cost and low-firing temperature honeycomb ceramic heat storage material, but the above The heat storage density of the heat storage materials in the two patents needs to be improved; the Chinese invention patent "A low-cost solar thermal power generation sensible heat-latent heat composite heat storage ceramic and its preparation method" (CN201711066294.8) prepared a SiC -Composite heat storage unit composed of corundum honeycomb ceramics packaged with Al-Si alloy phase change material, the heat storage density can reach 1500kJ / kg (room temperature ~ 1000°C), but its thermal conductivity needs to be improved

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