A question when stopping heating
Thread Content
When the heating is stopped for a long time, the air inlet door should be covered with a small iron plate to leave 5-10mm. Why should this gap be left? Can't it be covered completely?
A small amount of air is introduced to facilitate uniform cooling and reversal is required.
Considering that the furnace body will inevitably leak, some combustible gas will burn in the furnace body.
The reason why the coke oven heating damper cannot be fully closed is because there will inevitably be leakage in the carbonization chamber wall. At this time, a small amount of waste gas will enter the fire channel, so some air doors must be left to allow air to enter the fire channel and burn a small amount of waste gas. On the other hand, mature coke will generate heat by itself, so the coke oven must be exchanged normally to maintain uniform temperature throughout the furnace.
In order to prevent explosions caused by leakage
Cover it completely. If the heating is stopped for a long time and the furnace body is well sealed, the exhaust gas will be exhausted. After switching to normal heating and there is no exhaust gas, where does the suction come from? , after stopping heating, ensure that the furnace temperature drops evenly and slowly. After stopping heating, pay attention to exhaust gas exchange, that is, both fire channels should be cooled down, and the overall temperature of the furnace body will drop more stably.
The main purpose of a small amount of air ventilation is to burn part of the waste gas that leaks from the carbonization chamber.
I agree with what the comrade above said. I think another point is that the residue in the gas pipe will volatilize into gas. If it enters the coke oven without air, it may fill the coke oven, and the incoming air will form explosive gas, causing an explosion. There was once a company that was overhauling a tower whose medium was flammable and explosive. After passing the steam cleaning, it started working. On the way, it ignored that the gas emitted by the substances attached to the tower wall would form explosive gas and cause an accident.