TM 5-815-1/AFR 19-6
Fly Ash
Suspended particles, charred paper, dust, soot, or other partially burned
matter; carried in the gaseous by-products of combustion. (Sometimes
referred to as particulate matter, or pollutants).
Gas Absorption
A process for removing a gas constituent from an exhaust gas stream by
chemical reaction between the constituent to be removed and a scrubbing
liquor.
Unit of weight, equal to 1 lb.
Grain
7000
Heat Content
The sum total of latent and sensible heat stored in a substance minus that
contained at an arbitrary set of conditions chosen as the base or zero point.
Usually expressed as Btu/lb, Btu/gal, Btu/ft3 for solid, liquid and gaseous
fuels, respectively.
Heat Release Rate (firing rate)
The amount of heat liberated during the process of complete combustion
and expressed in Btu/hr/ft3 of internal furnace volume.
High Temperature Fixation
Reaction between nitrogen and oxygen at a high temperature in air
Reaction
forming nitrogen oxides.
Horizontal Front Wall Firing
Horizontal furnace firing with all burners located in the front wall.
Horizontal Opposed Firing
Horizontal furnace firing with burners located on directly opposing walls.
Impaction
Particle to liquid adherence from collision.
Intermittent Filtering System
A flow pattern in a fabric filter system which is saw-tooth-like. The flow
continually decreases until it is stopped. Then cleaning takes place and flow
is then again resumed at an increased value which again decreases, etc.
In. Water
Inches of water column used in measuring pressure. One inch of water
column equals a pressure of .036 lb/in2.
Mass Transport
Any process or force that causes a mass to flow through an open system.
Micron
Unit of length, equal to 1 millionth of a meter.
Multiple Chamber In-Line
An incinerator design that allows combustion gases to flow straight through
the incinerator with 90-degree turns in only the vertical direction.
Multiple Chamber Retort
An incinerator design that causes combustion gases to flow through 90-
degree turns in both horizontal and vertical directions.
Mulicompartment Baghouse
A compartmented filter baghouse that permits a uniform gas flow pattern
as compartments are taken offline for cleaning.
NOx
Nitrogen oxides.
Overfire Air (Secondary Air)
Any air controlled with respect to quantity and direction, which is sup-plied
beyond the fuel bed (as through ports in the walls of the primary combustion
chamber) for the purpose of completing combustion of materials in gases
from the fuel bed. (Also used to reduce operating temperatures within the
furnace and referred to as secondary air).
Orsat Analysis
An apparatus used to determine the percentages (by volume) of CO2, O2,
and CO in flue gases.
The ability of air (gas) to pass through filter fabric, expressed in ft3 of air per
Permeability (of fabric)
mm. per ft2 of fabric with .5" H2O pressure differential.
Peak Flame Temperature
The highest temperature achieved in the primary combustion zone.
Plant Thermal Efficiency
The actual power output of a plant divided by the theoretical heat input rate.
Plenum (or Plenum Chamber)
Part of a piping or duct flow system having a cross-sectional area consider-
ably larger than that of any connecting ducts pipes or openings.
Porosity (Fabric)
A term often used interchangeably with permeability. (Actually a percentage
of voids per unit volume).
Preheated Air
Air heated prior to its use for combustion, frequently by hot flue gases.
Primary Combustion Temperature
Temperature measured at the flame.
Glossary-2
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