2017年10月30日星期一

Refractory materials for coke ovens

Refractory materials
Refractory materials
Coke oven is the technical equipment of coking plant, is a complex and continuous production of thermal equipment, mainly by the combustion chamber, carbonization room, regenerative, roof, chute, small flue and other components. Its purpose is in the isolated air conditions, the coal heated to 950 ~ 1100 ℃, after dry distillation to obtain coke and other by-products.
At present, the life of a coke oven is generally 25 to 30 years, the use of refractories mainly silica brick, clay brick, high alumina refractory bricks. The environmental conditions of the various parts of the coke oven and the requirements for refractory materials are as follows:
Carbonization chamber and partition wall of combustion chamber
The partition wall acts to heat the heat and isolate the furnace gas and support the load. Coke coking temperature is generally 950 ~ 1050 ℃, in order to ensure coking, coke oven wall carbonization chamber side of the surface temperature should be heated to 1100 ~ 1450 ℃; carbonization chamber side of the wall to be thrusting wear; due to coal dry distillation, coking The process in the isolated air conditions, the requirements of the wall air tightness, high temperature airtight, does not occur shrinkage deformation, product shape regular, accurate size to ensure that the small cracks and not cause cracks in the cracks; carbonization chamber in the coking process There is water discharge, the combustion of indoor combustion products contain a small amount of water, and because of coal salt chemical erosion and gas decomposition and carbon deposition, may damage the walls of the organization and performance, strength decreased.
Based on the above characteristics, carbonization chamber and combustion chamber with refractory materials, the world's coke oven almost all use silicon brick. Silica brick compared with other refractories, in the range of 700 ~ 1450 ℃ within the product changes and thermal conductivity of the small changes in its high temperature strength is high, the load softening temperature and its similarity (1620 ~ 1660 ℃), wear resistance, It is not easy to hydrate. With the large-scale coke oven and strengthen the production needs, can also be used thermal conductivity, volume stability, high temperature strength are high silicon carbide refractories. But the price is expensive, in the oxidative atmosphere easily oxidized damage, so the curtain wall is rarely used. And the incorporation of metal oxide high-density high thermal conductivity of silicon brick, wall thickness can be reduced, the intensity of heat transfer, improve the productivity of coke oven, but also improve the furnace life.

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