What is the maximum temperature in the combustion chamber of a coke oven?
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What is the maximum temperature in the combustion chamber of a coke oven? Is the combustion chamber the part of the coke oven where the temperature is highest? What kind of refractory bricks or materials are used on both sides? I want to build a burner for coke oven gas, with the flame being relatively close to the refractory bricks surrounding it. Would high-alumina refractory bricks work for this purpose? Thank you! @angryant
High-alumina bricks won’t work! High-alumina bricks exhibit creep!
During coke production in a coke oven, heat is supplied from the furnace walls on both sides of the carbonization chamber; the temperature of these furnace walls is around 1100°C. On the other side of the carbonization chamber chamber are the combustion chambers, and the temperature of the furnace walls there comes from the combustion of gas within those chambers. The temperature of the furnace walls on that side is about 1300°C, though it can reach up to 1400°C as well. The height of the carbonization chamber is related to the heating uniformity of the coke oven, while the width of the combustion chamber is associated with the height of the carbonization chamber. The wider the combustion chamber, the greater the expansion pressure from the coal generated during the coking process in the carbonization chamber that it must withstand. The height of the combustion chamber is usually lower than that of the carbonization chamber. For large-scale integrated designs like coke ovens, there are usually ready-made sets of drawings for material selection; it’s not feasible to expect someone to develop everything from scratch – that would be absurd.
High-alumina bricks are expensive; clay bricks are usually sufficient.
The maximum temperature in the combustion chamber shall not exceed 1450. Generally, at a position about 1 meter away from the wall where the burner is located, the temperature reaches its highest value after 20 seconds of reversal, approaching 1400. High-alumina bricks and clay bricks are not suitable for this purpose; only silicon bricks have a load softening point that meets the requirements
Use silica bricks; their load softening point is 1450 degrees, and this temperature must not be exceeded. Moreover, the temperature difference should not be too large, and the temperature should not change frequently. Silicon bricks have poor resistance to rapid heating and cooling.
The temperature range is 950–1500°C. The temperature in the coke oven flue is a control variable that directly reflects the heating level of the coke oven, and it is key for feedback regulation. The accuracy and timeliness of measurement directly affect the control effectiveness of the coke oven temperature. Temperature measurement is done manually, with readings taken once every 4 hours. The measurement cycle is long, the time span over which measurements are taken is large, the detection times vary, there are individual differences, and the workload is high. As a result, the errors in the measurements are significant, the control cycle is long, and temperature fluctuations are considerable. High-temperature resistant sensing elements are used for long-term online monitoring of temperature changes; the acquisition unit converts the temperature values into digital forms for transmission, ensuring timely and accurate data collection, while reducing labor intensity and maintenance needs. The infrared radiation temperature measurement location is the same as the traditional one, facilitating comparison.