Fire from below at the top of the regenerator chamber
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At our factory’s 6-meter top-mounted coke ovens, we conducted a measurement of the temperature at the roof area. It was found that smoke was coming from multiple chutes leading to the roof area. When we opened the covers of the fire ports numbered 1–6, black smoke was observed coming from them. After a while, when no more smoke was present, it was discovered that the fire was burning in those chutes
This is an obvious case of leakage through the furnace wall; raw gas mixed with coal dust particles leaks from the carbonization chamber into the combustion chamber. As the airflow in this combustion chamber moves upward, black smoke emerges from the observation holes, while when the airflow moves downward, it enters the inclined channel and burns there. After performing thermal repair on the furnace wall to fix the leakage, there are no more problems.
This is an obvious case of leakage through the furnace wall; raw gas mixed with coal dust particles leaks from the carbonization chamber into the combustion chamber. As the airflow in this combustion chamber moves upward, black smoke emerges from the observation holes, while when the airflow moves downward, it enters the inclined channel and burns there. After performing thermal repair on the furnace wall to fix the leakage, there should be no problems left.
Thank you, master. After opening the fire hole cover, the smoking stopped after a while, but I could see burning at the entrance of the chute; the flame from the nozzle was very weak. What’s going on?
Could it be clearer? What kind of gas is used for heating coke ovens? Once the fire viewing hole is opened, the smoking stops after a while; it seems that the flame path has changed from an upward one to a downward one. The waste gas passes from the carbonization chamber through the furnace walls that run across the building and enters the inclined channel, where it burns together with the air supplied by the lamps.
For the coke oven gas used for heating, open the cover of the viewing hole; once the smoke inside has dissipated, a flame will appear after a while. In terms of the technical aspects, excessive leakage of exhaust gases prevents proper heating from taking place
If fire is still coming from the fire hole during the descent, it is likely that there is a melting hole in the furnace wall; this not only causes gas leakage but also allows coal to flow into the combustion chamber, blocking the chutes. In which year were your coke ovens built?
One and a half years after it was put into operation, there is severe leakage from the furnace body; however, only other combustion chambers emit black smoke, while the inclined duct does not catch fire – this situation is serious. Some technicians say it is caused by leakage at the bottom formwork of the carbonization chamber, while others suggest purging the small flue to increase the amount of waste gas to be discharged
Generally, melting holes do not occur after one and a half years of operation. Have you checked whether the problem lies with the bottom formwork? What’s the situation? How are the furnace protection components? How were the furnace protection iron parts managed over these one and a half years?
If heat is applied to multiple burners, short circuits may occur; check whether the vertical pipes are blocked and unobstructed. Insufficient jet force can lead to short circuits, and if there is excessive leakage, it is necessary to improve the management of metal components and the coke pushing process
It is not possible to be 100% certain of the problem based solely on the description; address the following aspects: 1. Measure the air excess coefficients in the primary flue and the smoke distribution ducts, check the oxygen level and for the presence of CO; it is also advisable to measure the leakage rate of raw gas when using furnace gas. 2. Increase the pressure at the burner holes to 20–25 Pa and see if there are any changes. 3. Apply spraying to the brick gas ducts to observe whether there are any changes. 4. Check whether there is any reverse flow of air and gas