High-temperature air resistance furnace using silicon carbide foamed ceramic to enhance radiation absorption

Abstract

The invention provides a high-temperature air resistance furnace using silicon carbide ceramic foam to enhance radiation absorption, and a heating source is supplied for the high-temperature air resistance furnace by adopting a mode of combined heating of an electric filament heat rod (6) and a silicon carbide rod (8). By using the characteristic that the silicon carbide foamed ceramic absorbs heat radiation and has high temperature resistance and large specific surface area, a silicon carbide foamed ceramic body (5) with certain thickness and porosity and a silicon carbide ceramic foam sheet (9) are inserted in a high-temperature air resistance furnace body (2) to increase the heat transfer area of the high-temperature air resistance furnace, improve the convective heat exchange coefficient of the air, obtain high-temperature air, and reduce the volume of the air resistance furnace. The high-temperature air resistance furnace body (2) is divided into four heating regions by the silicon carbide foamed ceramic body (5), namely a pre-heating region, a medium-low temperature heating region, a medium-high temperature heating region and a high temperature heating region. The silicon carbide foamed ceramic sheet (9) and the silicon carbide foamed ceramic body (5) absorb heat radiation of the electric filament heat rod (6) and the silicon carbide rod (8).

Description

technical field [0001] The invention relates to the field of an air resistance furnace, in particular to a high-temperature air resistance furnace based on silicon carbide foam ceramics to enhance radiation absorption. Background technique [0002] Most ordinary air heating furnaces can only heat the air below 600°C. In order to obtain high-temperature air above 600°C, two heating methods can be adopted—flame heating and electric heating. Among them, the flame heating method must use a non-metallic heat exchanger with high temperature resistance and oxidation resistance. Due to the difficulty in sealing non-metallic heat exchangers in high-temperature environments, high-temperature flue gas and air heating are easily mixed together, and it is difficult to adjust the air temperature, which has disadvantages such as environmental pollution and large equipment. Chinese patent CN2226733Y proposes a high-efficiency air heater that uses a heat pipe to heat the air. One end of th...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of low air outlet temperature, low heat transfer efficiency and large volume of the existing air resistance furnace, and propose an air resistance furnace based on silicon carbide foam ceramics to enhance radiation absorption

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