Boiler design and practical operation issues
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We have a waste heat boiler here; its design specifies an inlet flue gas temperature of 1100°C and an outlet temperature of 250°C, with the ability to produce steam at 0.6 Mpa in a rate of 8 t/h. Currently, it is operating at low load: the inlet flue gas temperature is 350°C, and the outlet temperature has reached 180°C. The steam production volume remains very low, with the flow meter indicating only 0.03 t/h. I would like to know if there is anything wrong with the design of this boiler – could it be that the heat exchange area is insufficient?
Under normal circumstances, the operating conditions of a boiler are supposed to fall within a certain range. In your case, it seems there is a significant difference from the design specifications. I wonder if there is dust in the waste heat flue gas; if so, it can easily cause blockages in the flues. With a low flue gas temperature, the heat exchange amount compared to high-temperature flue gas is definitely smaller, and naturally the amount of steam produced is also much less.