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Damage mechanism and performance requirements of coke oven door lining

Damage mechanism and performance requirements of coke oven door lining

Coke oven production coke oven doors are opened frequently, the surface temperature is high, the temperature of coal loading and coke discharge changes greatly, the operating environment is poor, and the service life is short. The search for a new coke oven door lining material with high strength, light weight, good thermal insulation and excellent thermal stability is a common concern among coking workers. The door lining structures of traditional domestic 4.3m coke ovens and 6m coke ovens are basically built with small refractory bricks such as cordierite bricks and clay bricks. Some coking plants have also tried refractory castables as furnace door lining materials, but Its service life is not long. Therefore, refractory castables have not been widely used in the field of domestic coke oven door lining structures.

In recent years, some ultra-large-volume coke oven door linings have adopted castable prefabricated block structures. However, prefabricated blocks produced with domestically produced castables cannot meet the design indicators of imported advanced foreign technologies. Especially in terms of service life, it is not even as good as the performance of used modules that have been removed from abroad. It is very necessary to develop new refractory castables for coke oven doors.

The factors causing damage to the coke oven door are summarized as follows:

  1. Chemical attack

The products of the coking process are complex, mainly including H, CH, C2H6, C2H4, C3H8, CO, CO2, N2, benzene, toluene, xylene and some other compounds. The coke oven door lining bricks have always been chemically attacked by these products. These active gaseous and liquid pyrolysis products first diffuse into the interior of the brick through the apparent pores of the brick, and finally chemically react with the substances in the brick and physically diffuse to destroy the crystal lattice structure of the brick and reduce the comprehensive physical properties of the brick.

  1. Thermal damage

In each cycle of coking, the furnace door lining brick is subjected to three thermal shocks, namely 1000°C to room temperature, room temperature to 700°C, and 700°C to room temperature. This leads to cracks on the surface of the lining bricks and concentration of thermal stress at the corners, often causing damage to the brick corners.

  1. Mechanical damage caused by carbon deposit cleaning

During the use of a coke oven, coking products such as tar adhere firmly to the surface of the lining bricks. As the use cycle prolongs, the carbon deposit layer gradually thickens, causing the furnace door to not close tightly, resulting in air leakage and fire. Methods such as mechanical removal and high-pressure water flushing are commonly used to clean carbon deposits. The resulting mechanical force accelerates the damage of the coke oven door lining bricks.

In order to make the coke oven door lining bricks have a longer service life, the basic properties that the lining bricks must have

1) It has good thermal shock stability and can withstand the thermal shock during coke oven production;

2) Have high strength;

3) Has extremely low thermal conductivity coefficient and density (can reduce energy consumption, save costs, and improve the working environment);

4) High resistance to chemical attack;

5) It has the ability to resist carbonization (carbon removal is labor-intensive and causes environmental pollution).

Coking Equipment Manufacturer
coke ovens
coke oven door

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