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A Wet-bottom furnace or wet-bottom boiler is boiler that contains a wet bottom furnace. It is a kind of boiler used for pulverised fuel firing.
In wet bottom boilers, the bottom ash is kept in a molten state and tapped off as a liquid. Wet bottom boiler slag is the molten condition ash as it is drawn from the bottom of the slag-tap or cyclone furnaces.[1]
An advantage is the fact that the end product in this process has a higher value compared to that of a dry bottom boiler. Wet bottom boilers are preferred for low volatile coals that produce a lot of ash. But it has higher investment costs and higher maintenance costs, so it is built less often.
^"Coal bottom ash with boiler slag - Material description" (PDF). U.S. Nuclear Regulatory Commission. Retrieved November 7, 2023.
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