TM 5-815-1/AFR 19-6
GLOSSARY
Acid Dew Point
Temperature at which acid vapor condenses to form acid droplets.
Actual Combustion Air
The total amount of air supplied for complete combustion and equal to the
theoretical plus the excess air.
Air Register
A type of burner mounting which admits secondary air to the combustion
area.
Air-to-Cloth Ratio
The rate of volumetric capacity of a fabric filter (volume of air or gas in
ft3/min per ft2 of filter fabric) commonly expressed as ft/min. Also called
filtering velocity, superficial face velocity, and filtration rate.
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API
Scale adopted by the American Petroleum Institute to indicate the specific
gravity of a fluid. (API gravity for a liquid rises as its temperature rises.)
Ash
Non-combustible mineral matter which remains after a fuel is burned.
Atmospheric Stability
Degree of non-turbulence in the lower atmosphere.
Atomization
The breaking of a liquid into a multitude of tiny droplets.
Blinding (blinded)
Loading or accumulation of filter cake to the point where the capacity rate
is diminished. Also termed "plugging" (Plugged).
Boiler (thermal) Efficiency
Ratio of useful heat in delivered steam to the theoretical gross heat in the
fuel supplied.
Burner
A device which positions a flame in a desired location by delivering fuel
(and sometimes air) to that location. Some burners may also atomize the
fuel, and some mix the fuel and air.
Calcine
To render a substance friable by the expulsion of its volatile content through
heat.
Cloth Area
The total amount of cloth area in the form of bags or envelopes in a fabric
filter system.
Cloth Weight
A measure of filter fabric density. It is usually expressed in ounces per
square yard or ounces per square foot.
Co-Current
Scrubbing spray liquid and exhaust gas flowing in the same direction.
Combustion Air Windbox
Inlet plenum for preheated combustion air.
Combustion Efficiency
The actual combustion heat released divided by the maximum possible heat
that can be released by combustion of a fuel.
Continuous Automatic Filtering
A fabric filter unit that operates continuously, without interruption for
System
cleaning. The flow pattern through the system is relatively constant.
Critical Temperature
Temperature above which the substance has no liquid-vapor transition.
Dilution Air
The air added downstream of the combustion chambers in order to lower
the exhaust gas temperature (In incinerators).
Entrainment Spray
Atomized liquid downstream of scrubber spray nozzles.
ESP
Electrostatic precipitator.
Excess Air
The air remaining after a fuel has been completely burned (also, that air
which is supplied in addition to the theoretical quantity required).
Felted Fabrics
Structures built up by the interlocking action of the fibers themselves,
without spinning, weaving, or knitting.
Filament
A continuous fiber element.
Flue Gas
All gases which leave the furnace by way of the flue, including gaseous
products of combustion and water vapor; excess oxygen and nitrogen.
Glossary-1
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