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The question is as follows: With constant external loads, what is the change in the water level of the steam drum when combustion weakens? Please share your opinions. Thank you – does it drop first and then rise, or rise first and then drop? Thank you; points will be given for answers
It first drops and then rises; as combustion weakens, the heat absorbed by the boiler water decreases, which results in a reduction in the amount of steam generated. This leads to a drop in the water level in the drum. At the same time, the reduced amount of steam causes the pressure inside the drum to drop, thereby lowering the saturation temperature of the water. As a result, more and more steam on the inner wall of the drum condenses into water, causing the water level in the drum to rise
The amount of steam generated by the drum decreases; shouldn’t the water level rise then? How could it decline?
Rise first, then fall. On the assumption that the external load remains constant, when combustion weakens, the amount of steam produced must decrease. To maintain a constant load, it is necessary for the steam flow rate to stay unchanged; obviously, the water level will first rise slightly.