Honeycomb heat accumulator made of silicon carbide-corundum composite materials

Abstract

The invention relates to a honeycomb heat accumulator made of silicon carbide-corundum composite materials, which comprises the following main raw materials: 20-30wt% of silicon carbide powder, 4-8wt% of zirconia corundum powder, 20-30wt% of corundum powder, 15-20wt% of porzite powder, 15-30wt% of composition of kyanite, andalusite and sillimanite, 4-8wt% of kaolin and 2-5wt% of cellulose powder. The preparation method of the honeycomb heat accumulator comprises the following steps: adding the main raw materials into a ball mill for ball milling; adding stearic acid of which the weight is not greater than 1% of the total weight of the main raw materials for ball milling, and then, sieving to obtain a mixture; respectively adding tung oil of which the weight is not greater than 1% of the weight of the mixture and glycerol of which the weight is not greater than 1% of the weight of the mixture for mixing, aging and vacuum pugmill to form pug segments; carrying out extrusion forming in a mold, and drying; and insulating at the temperature of 1400-1450 DEG C for 4-8 hours, and then, calcining. The honeycomb heat accumulator of the invention has the characteristics of high fire resistance, good thermal shock resistance, strong corrosion resistance, large heat exchange area, small gas flow resistance, high heat accumulating efficiency, small floor space and long service life which can be more than two years, and is widely used for heat accumulating type heating furnaces of black and non-ferrous smelting, thermal power generation, petrochemical industry, ceramics, glass, machining, civil cookers and the like.

Description

technical field [0001] The invention relates to a ceramic honeycomb regenerator, in particular to a composite ceramic honeycomb regenerator for high-performance heat exchange. Background technique [0002] Energy shortage is one of the biggest problems facing the international community today. With the rapid development of the world's industrialization process, combustion heat energy exchange (such as thermal power generation, urban central heating, etc.) and thermal energy processing (smelting, heat treatment, chemical and building material production, etc.) are one of the largest users of energy consumption. In order to save energy, most of these industries have modified the furnace equipment, strengthened the thermal insulation of the furnace equipment, strengthened the heat transfer of the heat medium to the heated object, etc., to improve energy utilization and combustion efficiency. However, since the waste heat of the kiln equipment is mainly taken away by the flue g...

AI Technical Summary

Problems solved by technology

However, due to the high temperature resistance and low compressive strength of the above-mentioned heat storage body, especially the low thermal shock resistance and corrosion resistance, and the relatively high water absorption, in practical applications, due to the low cleanliness of the gas and the tar There is a lot of dust and dust content, and the rising substances on the initial heating material (such as zinc phosphate on the steel, iron oxide produced during the oxidation reaction in the furnace), will be produced under harsh conditions such as negative oxygen and corrosive gases. A large amount of dust and sticky matter will easily cause the pores of the honeycomb heat storage body to adhere and block. Under high temperature and corrosion, the heat storage body is easy to crack, break, pulverize and collapse, so that the heat storage body cannot be used normally and the service life is shortened. Not more than one year, generally 8-10 months, thus shortening the service life of regenerative kiln equipment, not only increasing the operating cost of kiln equipment, reducing economic benefits, but also causing environmental pollution, which is not conducive to the environment Protect