[2026 Condition Analysis] Is the zero water level of the drum located at the geometric center line of the drum?

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The last edit to this post was made by The one on 2026-5-5 06:27. The normal water level in the drum is determined after thorough consideration, with a view to ensuring good steam quality and a reliable water circulation system. The space of the steam drum is limited; its lower part is used to hold water, while its upper part is used to hold steam. As the normal water level rises within the drum, the steam space and height in the drum decrease, which increases the humidity of the saturated steam and affects its quality ； When the normal water level in the drum drops, the height from the water surface to the inlet of the downcomer decreases, which may cause the inlet of the downcomer to vaporize on its own or for vapor to be carried in by the vortex, thereby affecting the water circulation. At the same time, as the water capacity in the drum decreases, the time required to drop from the normal water level to the emergency water level is shortened, which is detrimental to safety. Therefore, the normal water level of the drum is determined based on the factors mentioned above; for large-capacity boilers, the normal water level of the drum is generally around 200 mm below the geometric center line of the drum.