The issue of gas leakage
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I discovered a very strange situation today; I would like to ask my colleagues to discuss it. Our coke ovens are located right next to the retaining wall of the gas flue; as the adjacent gas flue rises, blast furnace gas can leak to the other side of the retaining wall (the gas seeps out through the gaps between the bricks of the retaining wall and the concrete wall), and tests using alarms show levels of over 800. And when it drops, there is no leakage. I remember that the main wall at the far edge of the small flue was also constructed with three layers of bricks, inner and outer, and the retaining wall was a solid brick section built layer by layer with interlocking bricks. If it’s gas that came through the small flue, it seems impossible; but if it didn’t come through the small flue, then where did it come from?
How do you know there is no leakage during downward airflow? When rising, leaks can be detected by measuring the gas concentration; but when descending, exhaust gas is flowing, so leaks would be difficult to detect, right? Furthermore, leakage through the retaining wall is also possible.