Porous heat transfer element

Abstract

The invention provides a porous heat transfer element. Silicon nitride, ceramic powder or clay powder is taken as the matrix, and is processed into a rough part together with a pore-forming agent, and the rough part forms the porous heat transfer element after being dried, calcined and soot-blown, wherein, the pore-forming agent is selected from granules processed after beans, cereals or forestry and agricultural residues are dried and crushed. The pore-forming agent is fully decomposed during the process of sintering, so as to form a porous body which is used for allowing fuel gas (air) to flow through, thereby coming into the surface contact and finishing the heat exchange. The porous heat transfer element has the advantages that the raw materials are easily accesible, the processing is simple, the element is used for assembling a gas-gas regenerative heat exchanger, the application scope can be greatly enlarged, the service life is prolonged, the cost is reduced, and the utilization ratio of the fuel gas waste heat can be effectively improved particularly.

Description

A porous body heat exchange element 1. Technical field The invention relates to a heat exchange element, in particular to a heat exchange element for an air-air heat exchanger, specifically a porous body heat exchange element. 2. Background technology In order to save energy, the waste heat of the flue gas must be utilized, and a heat exchanger is required for waste heat utilization. At present, there are mainly two styles of gas-gas heat exchangers: shell-and-tube type and regenerative type, among which the utilization rate of regenerative heat exchanger is relatively high. The heat exchange effect of the heat exchanger mainly depends on the structure and material of the heat exchange element. Existing heat exchange elements are made of sheet metal or piled up with pebbles. Metal sheet heat exchange elements are expensive and easy to corrode; cobblestone piles are bulky, slow heat transfer rate, limited application range, and their heat exchange efficiency and waste hea...

AI Technical Summary

Problems solved by technology

Metal sheet heat exchange elements are expensive and easy to corrode; pebbles are bulky, slow heat transfer rate, limited application range, and their heat exchange efficiency and waste heat utilization rate are low

Because the heat exchange area per unit volume of these two regenerative heat exchangers is relatively small, resulting in a large heat exchange temperature difference, at a certain waste heat temperature, the temperature rise of air and other working fluids after passing through the heat exchanger is relatively small, that is The obtained waste heat energy is less, and the waste heat utilization rate is low

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