Coke oven regenerator checker bricks are an important part of the coke oven, and their integrity is crucial to the normal operation of the coke oven. However, during actual operation, checker brick damage occurs from time to time, seriously affecting the production efficiency and stability of the coke oven. This article will conduct an in-depth analysis of the causes and mechanisms of damage to this bricks in coke oven regenerators from a professional perspective.
The causes of damage to checkered bricks mainly include the following aspects:
(1) High-temperature oxidation: During the working process of the coke oven regenerator, the refractory material on the surface of the checker bricks is prone to oxidation reaction due to long-term exposure to high temperatures, resulting in loose structure, reduced strength, and eventual damage.
(2) Thermal shock damage: During the start-up and shutdown process of the coke oven, the temperature of the regenerator will change drastically, resulting in thermal stress, which will cause micro-cracks inside the checker bricks. As time goes by, the micro-cracks will gradually expand, eventually leading to the failure of the checker refractory bricks. Broken bricks.
(3) Chemical erosion: During the production process of coke ovens, some corrosive gases, such as hydrogen sulfide, sulfur dioxide, etc., will be produced. These gases will chemically corrode the checker fire bricks, causing structural damage to the bricks.
(4) Mechanical wear: During the operation of the coke oven, airflow, coke, etc. will cause erosion and wear of the checker refractory fire bricks. Over a long period of time, traces of wear will appear on the surface of the checker refractory bricks, which may cause damage in severe cases.
The damage mechanism of checker fire bricks mainly includes three aspects: thermal stress damage, chemical erosion and mechanical wear. Among them, thermal stress damage is the main reason for the damage of checker bricks. During the process of starting and stopping the coke oven, the temperature of the regenerator changes rapidly, causing thermal stress inside the grill bricks. When the thermal stress exceeds the strength of the bricks, damage will occur. In addition, chemical erosion and mechanical wear will also have a certain impact on the damage of checker refractory bricks.
In order to reduce the damage rate of checker bricks, the following measures can be taken:
(1) Optimize the start-up and stop process of the coke oven, reduce temperature fluctuations, and reduce the impact of thermal stress on the checker fire bricks.
(2) Strengthen the sealing of the coke oven, reduce the generation and diffusion of corrosive gases, and reduce the damage to the checker refractories bricks caused by chemical erosion.
(3) Improve the material and manufacturing process of this bricks to improve the wear resistance and corrosion resistance of the bricks.
(4) Regularly inspect and repair checkered bricks, discover and deal with damage problems in a timely manner, and avoid the expansion of damage.
In summary, the causes and mechanisms of damage to checker bricks in coke oven regenerators are complex and diverse, and require analysis and response from multiple aspects. By taking reasonable measures and technical means, the damage rate of checker fire bricks can be effectively reduced and the production efficiency and stability of coke ovens can be improved.
