How much does the coal line to the coke line shrink for a 6-meter top-mounted coke oven?
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How much does the coal cake shrink in typical 6-meter top-mounted coke ovens? In our plant, the shrinkage is around 200 mm. Additionally, the space above the oven in our plant remains at around 770 degrees – it’s difficult to increase this value. Is this related to the shrinkage? How to increase the temperature in the furnace top space: currently, mixed gas is used for heating, the height of the coal cake is 5500–5600, the pressure in the gas collection pipe is 150 Pa, the temperatures on the upper and lower sides of the furnace wall are around 40 degrees, and the air excess factor is 1.0–1. Around 1. What methods are there to increase the temperature in the space above the furnace, without reducing the height of the coal cake?
Generally, for coal briquettes or top-loaded coal, the vertical shrinkage in the carbonization chamber is around 5–7%, with slight variations among different coke ovens. The temperature in the roof space is low; apart from poor vertical contraction, this is closely related to vertical heating. From your data, the pressure in the gas collection ducts is fairly appropriate, and the temperature difference between the upper and lower parts of the furnace wall is also within acceptable limits. However, the air excess coefficient is slightly low. I wonder what the pressure at the viewing ports is like? Increasing the pressure at the viewing hole appropriately can enhance upward heating; give it a try.
Increasing the pressure at the monitoring holes was tried, from 0–5 Pa to 10–15 Pa, but the temperature in the furnace roof area remained unchanged