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Requirements For The Use Of High Alumina Refractory Bricks In Coke Ovens And Oven Precautions

Dec 29, 2023

High-alumina refractory bricks have been widely used in coke ovens because of their excellent high temperature resistance, thermal shock resistance and corrosion resistance. Coke oven is an important equipment in the metallurgical industry and is mainly used to produce coke. In the production process of coke ovens, high-alumina refractory bricks, as key components of coke ovens, are of great significance to the stable operation and extended service life of coke ovens. This article will introduce in detail the requirements for the use of high alumina refractory bricks in coke ovens and the precautions for ovens.

 

1. Requirements for the use of high alumina refractory bricks in coke ovens

High temperature resistance: During the production process of coke ovens, the temperature is extremely high, generally reaching more than 1500°C. Therefore, high-alumina refractory bricks must have good high-temperature resistance to ensure that sintering and deformation do not occur under high-temperature conditions.

Thermal shock resistance: During the production process of coke ovens, the temperature fluctuates greatly, causing the high-alumina refractory bricks to be subject to thermal shock. Therefore, high-alumina refractory bricks must have good thermal shock resistance to ensure that they do not crack or break under sudden temperature changes.

Anti-corrosion performance: During the production process, coke ovens are corroded by harmful substances such as soot and gas. Therefore, high-alumina refractory bricks must have good corrosion resistance to ensure that they will not be damaged during long-term use.

 

Wear resistance: During use, the coke oven is abraded by solid particles such as coal particles and coke. Therefore, high alumina refractory bricks must have good wear resistance to ensure that they do not wear out during long-term use.

Dimensional stability: During the use of the coke oven, the size of the high-alumina refractory bricks may change due to temperature fluctuations and the wear of solid particles such as coal particles and coke. Therefore, high-alumina refractory bricks must have good dimensional stability to ensure the normal operation of the coke oven.

2. Precautions for high alumina refractory brick oven

Preparation before drying: Before drying, a comprehensive inspection of the coke oven should be carried out to ensure that all parts are well sealed to prevent hot gas leakage. At the same time, the fuel, air and other conditions required for the oven should be prepared.

 

Control of the oven process: During the oven process, the oven temperature and time should be controlled based on the performance of the high-alumina refractory bricks and the actual conditions of the coke oven. Generally speaking, the oven temperature should be gradually increased to avoid damage to high alumina refractory bricks caused by excessive temperature. The oven time should be determined according to the thickness of the high alumina refractory bricks and the oven temperature.

Cooling after the oven: After the oven is completed, the temperature of the coke oven should be slowly lowered to allow the high-alumina refractory bricks to gradually cool down. During the cooling process, attention should be paid to observing the temperature changes of the high-alumina refractory bricks to prevent damage to the high-alumina refractory bricks caused by excessively high or low temperatures.

 

Safety measures during the oven process: During the oven process, safety operating procedures should be strictly followed to prevent fires, explosions and other safety accidents. At the same time, the monitoring of the oven site should be strengthened to ensure the safe and smooth progress of the oven process.

In short, the use of high-alumina refractory bricks in coke ovens has higher requirements and requires good high-temperature resistance, thermal shock resistance, erosion resistance and wear resistance. When drying, attention should be paid to controlling the oven temperature and time to ensure the safety and smoothness of the oven process. Only in this way can the stable operation of the coke oven and extended service life be ensured.

 

The causes of coke oven lining damage are thermal stress and mechanical wear, and chemical erosion is also one of the causes of lining damage. Therefore, coke ovens commonly use refractory materials such as silica bricks, magnesia bricks, high alumina bricks and clay bricks. Among them, silica bricks are used in large quantities and have good effects.

Silica brick is an acidic refractory material with good acid corrosion resistance. It has good thermal conductivity and high load softening temperature, generally above 1620℃, which is only 70~80℃ lower than its refractoriness. The thermal conductivity of silica bricks increases with the increase of operating temperature, and there is no residual shrinkage. During the oven process, the volume of silica bricks increases with the increase of temperature. Therefore, silica bricks are ideal refractory products for coke ovens. Important parts of modern large and medium-sized coke ovens (such as combustion chambers, ramps and regenerators) are all built with silica bricks.

 

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