Air excess factor issue?
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The air excess coefficient measured by some people is around 1.25 in the side flue during coke oven combustion, but it rises to 1.4 at the position of the damper; it can reach 1.5 or even higher in the flue and the main flue, and may go up to 2.0 at the chimney outlet. Where does this extra air come from? Where are the main leakage points? How to control it?
I think it is reasonable to take samples from the fire monitoring holes in the upward airflow, as this can reflect the actual situation, since the samples are taken right after the gas has burned. The small flue is too high; air can get in due to leaks in the walls of the regenerator chamber and improper sealing of the temperature measurement holes at the top of the regenerator. The position of the valve mechanism is also too high, which may result in poor sealing at the air vents, as well as at the connections between the small flues and the main flue. Air can also enter at the exhaust rod area. Additionally, the positions of the flues and the main flue are too high, leading to leaks at the base of the exhaust tray and cracks in the flues themselves……
Leaks in the main walls and sealing walls of the regenerator, as well as poor sealing at the actuators, can all lead to an increase in the amount of exhaust air