Coke Ovens

An overview of metallurgical coke ovens and an analysis of the working conditions:

Coke ovens are a kind of thermal equipment with a complex structure that requires long-term continuous production. They heat coal to 950-1050 ℃ through isolation from air for dry distillation to obtain coke and other by-products. Whether it is dry quenching coking or wet quenching coking, as an equipment for producing red hot coke, coke ovens are mainly composed of coking chambers, combustion chambers, regenerators, furnace top, chutes, small flues, and a foundation, etc.

The original thermal insulation structure of a metallurgical coke oven and its auxiliary equipment
The original thermal insulation structure of a metallurgical coke oven and its auxiliary equipment is generally structured as high-temp refractory bricks + light insulation bricks + ordinary clay bricks (some regenerators adopt the diatomite bricks+ ordinary clay brick structure at the bottom), and the insulation thickness varies with different types of furnaces and processing conditions.

This kind of thermal insulation structure mainly has the following defects:

A. The large thermal conductivity of thermal insulation materials leads to poor thermal insulation.
B. Huge loss on heat storage, resulting in energy waste.
C. Very high temperature on both the outer wall and the surrounding environment results in a harsh working environment.

The physical requirements for the backing lining materials of the coke oven and its auxiliary equipment: With consideration of the furnace’ loading process and other factors, the backing lining materials should have no more than 600kg/m3 in their volume density, the compressive strength at room temperature should be no less than 0.3-0.4Mpa, and the heat linear change should not exceed 3% under 1000℃＊24h.

Ceramic fiber products can not only fully meet the above requirements, but also have incomparable advantages that regular light insulation bricks lack.

They can effectively solve the problems that thermal insulation materials of the original furnace lining structure have: large thermal conductivity, poor thermal insulation, great heat storage loss, serious energy waste, high ambient temperature, and a harsh working environment. Based on thorough research in various light thermal insulation materials and relevant performance tests and trials, ceramic fiberboard products have the following advantages compared with traditional light insulation bricks:

A. Low thermal conductivity and good heat preservation effects. At the same temperature, the thermal conductivity of ceramic fiberboards is only about one third of that of common light insulation bricks. Also, in the same circumstances, to achieve the same thermal insulation effect, the use of ceramic fiberboard structure can reduce the total thermal insulation thickness by more than 50 mm, greatly reducing heat storage loss and energy waste.
B. Ceramic fiberboard products have high compressive strength, which can fully meet the requirements of the furnace lining for the compressive strength of insulation layer bricks.
C. mild linear shrinkage under high temperatures; high temperature resistance and long service life.
D. small volume density, which can effectively lower the weight of the furnace body.
E. excellent thermal shock resistance and can withstand extremely cold and hot temperature changes.
F. Accurate geometric sizes, convenient construction, easy cutting and installing.