Challenges in Coke Oven Hot Repair and Limitations of Existing Materials

Coke oven hot repair is a critical process in the coking industry. During operation, coke ovens are exposed to high - temperature environments, which lead to various damages such as cracks and wear on the oven lining. Traditional hot - repair materials often face challenges. For example, some materials have poor thermal shock resistance, which means they are prone to cracking when exposed to rapid temperature changes. Additionally, high expansion rates can cause structural instability in the coke oven lining, affecting the normal operation of the coke oven. Moreover, the low SiO₂ content and poor densification of some materials reduce their durability and service life, increasing the frequency and cost of repairs.

Introduction to Zero - Expansion Silica Bricks

Design Principle

Zero - expansion silica bricks are specifically designed for coke oven hot repair. Their design is based on advanced material science principles. By carefully selecting raw materials and using unique manufacturing processes, these bricks can achieve excellent performance in high - temperature environments.

Performance Advantages

High Thermal Shock Resistance: Zero - expansion silica bricks can withstand rapid temperature changes without cracking. Tests have shown that they can maintain their integrity even when the temperature changes by up to 800°C within a short period. This high thermal shock resistance allows for efficient hot repair without causing further damage to the coke oven lining. Low Expansion Rate: With an expansion rate of less than 0.1% within the operating temperature range of the coke oven (usually 1000 - 1300°C), these bricks ensure the structural stability of the coke oven lining. This low expansion rate is a significant improvement compared to traditional materials, which often have expansion rates of 0.5 - 1%. High SiO₂ Content: The SiO₂ content of zero - expansion silica bricks is as high as 98%. High - purity SiO₂ provides excellent high - temperature resistance and chemical stability, effectively preventing the erosion of the coke oven lining by various chemical substances. Good Densification: These bricks have a dense structure, which reduces the penetration of gas and molten slag, further enhancing their durability.

Comparison with Traditional Hot - Repair Materials

Compared with traditional hot - repair materials, zero - expansion silica bricks have obvious advantages. Traditional materials often require the coke oven to be shut down for repair, which leads to significant production losses. In contrast, zero - expansion silica bricks can be used for hot repair without shutting down the coke oven, greatly improving production efficiency. In terms of cost, although the initial cost of zero - expansion silica bricks may be slightly higher, their long service life and low maintenance requirements result in lower overall costs in the long run.

Real - World Application Cases

Many coking enterprises have adopted zero - expansion silica bricks for coke oven hot repair. For example, [Enterprise Name] replaced traditional hot - repair materials with zero - expansion silica bricks in its No. 3 coke oven. After the replacement, the frequency of repairs was reduced from once every three months to once a year. At the same time, the production efficiency increased by 15%, and the maintenance cost decreased by 30%. This case clearly demonstrates the effectiveness and cost - saving potential of zero - expansion silica bricks.

Technical Parameters and Performance Indicators

The technical parameters of zero - expansion silica bricks are as follows: bulk density is 2.3 - 2.4 g/cm³, compressive strength is greater than 50 MPa, and refractoriness under load is above 1650°C. These parameters reflect the high - quality and high - performance characteristics of the product.

Engage with Us

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