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((refimprove|date=November 2023))

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.<ref>((Cite web |title=Coal bottom ash with boiler slag - Material description |url=https://www.nrc.gov/docs/ML0636/ML063620170.pdf |access-date=November 7, 2023 |website=U.S. Nuclear Regulatory Commission))</ref>
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 [[Volatility (chemistry)|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.

==Wet-bottom boilers==
# Slag-tap boiler, burns pulverized coal. 50 percent of the ash is retained in the furnace as boiler slag.
# Cyclone boiler, burns crushed coal. 70 to 80 percent of the ash is retained as boiler slag. The rest of the ash leaves as [[fly ash]].

If the ash fusion temperature is less than the furnace temperature then that type of furnace is called a wet bottom furnace.

==Steps in the process==
# Both boiler types have a solid base with an orifice that can be opened to permit the molten ash that has collected at the base to flow into the ash hopper below.
# The ash hopper in wet-bottom furnaces contains quenching water.
# When the molten slag comes in contact with the quenching water, it fractures instantly, crystallizes, and forms pellets.
# The resulting boiler slag, often referred to as “black beauty,” is a coarse, hard, black, angular, glassy material.
# At intervals, high-pressure water jets wash the boiler slag from the hopper pit into a sluiceway which is then conveys it to a collection basin for dewatering, possible crushing or screening, and either disposal or reuse.

==References==
<references />

[[Category:Boilers]]
[[Category:Power station technology]]

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