Meaning of overfire | Babel Free

Definitions

Of a boiler, furnace, or other heating device: relating to components or other things that are located above the fire.

not-comparable

Examples

“In the interest⟳ of smoke⟳ abatement, overfire jets are now installed on thousands of commercial and industrial coal-fired furnaces. [...] The overfire jet is a device for providing turbulence and/or overfire air above the fuel bed of hand-fired and stoker-fired furnaces.”

“Volatile matter⟳ in the vapor form⟳ and carbon monoxide just above the bed must be fully mixed with overfire air to complete⟳ the combustion process⟳. At low firing rates it is important to minimize the amount of overfire air to prevent⟳ cooling of the volatile matter⟳ resulting in incomplete combustion and soot formation.”

“The primary flame zone can be operated fuel rich to reduce⟳ oxygen concentration, then additional air can be added downstream. This overfire air provides oxygen to complete⟳ combustion of unburned fuel and oxidizes carbon monoxide to carbon dioxide, creating a second combustion zone. Because there is so little fuel in this overfire zone, the peak flame temperature is low.”

“Over-fire boilers are the simplest and cheapest domestic boilers for burning wood logs. [...] In over-fire boilers, combustion takes place⟳ in the whole fuel batch more or less at the same time, as in wood-stoves. The boiler is normally equipped with a primary air inlet under the grate and a secondary air inlet over the fuel batch, into the gas combustion zone.”

CEFR level