1. Fine particulate, essentially noncombustible refuse, carried in a gas stream from a furnace. 2. Coal combustion residue.


Related Terms

STOICHIOMETRIC MIXTURE

An ideal mixture of fuel and air in which all of the fuel and oxygen in the mixture is consumed during combustion.

PILOTED IGNITION

The accidental initiation of combustion by means of contact of gaseous material with an external high-energy source, such as a flame, spark, electrical arc, or glowing wire.

PEEPDOOR

A small door in a furnace with a glass opening through which combustion may be observed.

OVERHEAD-VALVE ENGINE

A fourstroke-cycle internal combustion engine having its valves located in the cylinder head, operated by pushrods that actuate rocker arms. Abbreviated OHV engine. Also known as valve-in-head engine.

OTTO CYCLE

A thermodynamic cycle for the conversion of heat into work, consisting of two isentropic phases interspersed between two constant-volume phases. Also known as spark-ignition combustion cycle.

OCTANE REQUIREMENT

The fuel octane number needed for efficient operation (without knocking or spark retardation) of an internal combustion engine.

METERING ROD

A device consisting of a long metallic pin of graduated diameters fitted to the main nozzle of a carburetor (on an internal combustion engine) or passage leading thereto in such a way that it measures or meters the amount of gasoline permitted to flow by it at various speeds. Also known as metering pin.

MEADOW

Range of air-fuel ratio within which smooth combustion may be had.

MANIFOLD PRESSURE

The pressure in the intake manifold of an internal combustion engine.

LOW HEAT VALUE

The heat value of a combustion process assuming that none of the water vapor resulting from the process is condensed out, so that its latent heat is not available. Also known as lower heating value; net heating value.

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