Analysis of the damage causes and mechanisms of the checker bricks in the regenerator of coke ovens

The checker bricks in the regenerator of coke ovens are an important part of the coke oven, and their integrity is crucial to the normal operation of the coke oven. However, in the actual operation process, the checker bricks are often damaged, which seriously affects the production efficiency and stability of the coke oven. This article will conduct an in-depth analysis of the damage causes and mechanisms of the checker bricks in the regenerator of coke ovens from a professional perspective.

1. Analysis of damage causes

The damage causes of checker bricks mainly include the following aspects:

(1) High-temperature oxidation: During the operation of the coke oven regenerator, it is in a high-temperature environment for a long time. The refractory material on the surface of the checker bricks is prone to oxidation reaction, resulting in loose structure and reduced strength, which eventually causes damage.

(2) Thermal shock damage: During the start-up and shutdown process of the coke oven, the temperature of the regenerator will change dramatically, generating thermal stress, resulting in microcracks inside the checker bricks. As time goes by, the microcracks gradually expand, eventually leading to the damage of the checker bricks.

(3) Chemical erosion: During the coke oven production process, some corrosive gases such as hydrogen sulfide and sulfur dioxide are generated. These gases will chemically erode the checker bricks and cause damage to the brick structure.

(4) Mechanical wear: During the operation of the coke oven, airflow, coke, etc. will cause scouring and wear on the checker bricks. Over a long period of time, wear marks will appear on the surface of the checker bricks, and in severe cases, they will cause damage.

2. Mechanism analysis

The damage mechanism of checker bricks mainly includes three aspects: thermal stress damage, chemical erosion and mechanical wear. Among them, thermal stress damage is the main cause of checker brick damage. During the start-up and shutdown process of the coke oven, the temperature of the regenerator changes rapidly, resulting in thermal stress inside the checker bricks. When the thermal stress exceeds the strength of the brick body, it will break. In addition, chemical erosion and mechanical wear will also have a certain impact on the damage of the checker bricks.

In order to reduce the damage rate of checker bricks, the following measures can be taken:

(1) Optimize the start-up and shutdown process of the coke oven, reduce temperature fluctuations, and reduce the impact of thermal stress on checker bricks.

(2) Strengthen the sealing of the coke oven, reduce the generation and diffusion of corrosive gases, and reduce the damage to the checker bricks caused by chemical erosion.

(3) Improve the material and manufacturing process of the checker bricks to improve the wear resistance and corrosion resistance of the bricks.

(4) Regularly inspect and repair the checker bricks, promptly discover and deal with damage problems, and avoid the expansion of damage.

In summary, the causes and mechanisms of damage to the checker bricks in the regenerator of the coke oven are complex and diverse, and need to be analyzed and dealt with from multiple aspects. By taking reasonable measures and technical means, the damage rate of the checker bricks can be effectively reduced and the production efficiency and stability of the coke oven can be improved.