Analysis of the causes of fire leakage in small flues

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Recently, it was found that the bricks in the small flue below the regenerator were heated to red heat; when the downward airflow occurred, the temperature of the exhaust gases could reach almost 500 degrees. This is likely due to a leak of flames from the flue or a reverse flow of flames. The possible causes are as follows: 1. Leakage from the furnace walls of the carbonization chamber, or the removal of the bricks used to seal the heating holes, allowing unburned gas to enter the regenerator and continue to burn there. 2. Leakage from the brick gas ducts, with coke oven gas entering the regenerator and burning there – this is a likely possibility. 3. The removal of the gas nozzles, allowing coke oven gas to enter the downward airflow directly through the circulation holes, thus creating a short circuit. I’m not sure if the analysis is correct; does anyone have other reasons to suggest? The issue is currently under investigation; we hope everyone can provide guidance