The use of silica bricks in coke ovens can increase the temperature of the combustion chamber, shorten the coking time, increase the production capacity of coke ovens, and prolong the life of coke ovens. Therefore, modern large-scale coke ovens are mainly built with silica bricks.
SiO2 ≥94%
Good fire resistance
High softening temperature of load
Good thermal conductivity
Silica bricks for coke oven are mainly used for regenerator wall, ramp, coking chamber bottom, furnace wall and furnace roof of coke oven.
The coke oven is a complex thermal equipment that is used continuously for a long time. Its purpose is to heat coal to 950-1050°C for dry distillation under the condition of isolation of air to obtain coke and other by-products. Silica brick has become the main refractory material for coke ovens due to its good thermal conductivity, high load softening temperature, good mechanical strength at high temperature, stable volume change at high temperature, high refractoriness, small residual expansion, and strong resistance to acid slag erosion.
Silica brick has become the main refractory material for coke ovens due to its good thermal conductivity, high load softening temperature, good mechanical strength at high temperature, stable volume change at high temperature, high refractoriness, small residual expansion, and strong resistance to acid slag erosion.
| Silica bricks for coke oven | Furnace bottom, furnace wall | Other |
|---|---|---|
| SiO2 (%) | ≥94.5 | ≥94 |
| Al2O3 (%) | ≤1.2 | ≤1.5 |
| Fe2O3 (%) | ≤1.2 | ≤1.5 |
| CaO (%) | ≤3.0 | ≤3.0 |
| Na2O+K2O (%) | ≤0.35 | ≤0.35 |
| Apparent porosity (%) | ≥22 | ≥24 |
| Normal temperature compressive strength MPa | ≥35 | ≥28 |
| 0.2MPa Load softening temperature℃ | ≥1650 | |
| True Density g/cm3 | ≥2.33 | ≥2.34 |
| Reburn line change % 1450℃x2h | 0-0.2 | |
| Coefficient of thermal expansion 1000℃ (%) | ≤1.28 | ≤1.3 |
Silica brick is the main refractory material of the coke oven. The quality of the coke oven plays a key role in energy saving, consumption reduction, high efficiency, environmental protection and improving the service life of the coke oven.
Silica bricks for coke ovens need to have excellent high-temperature volume stability and slag resistance, good thermal conductivity, and low residual quartz content.
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