1.12.2
Inlet Gas Conditions
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NOTE:
1. To properly apply their equipment, the dust
collector manufacturer must know the expected inlet
gas conditions. This information can best be
supplied by the boiler or incinerator manufacturer.
2. In determining the inlet gas conditions for
existing installations, source testing should be
performed to determine the gas flow and contents.
Gas volume determinations should be made using a
Pitot tube in accordance with ICAC "Test Procedure,"
Bulletin 101. This publication incorporates ASME
techniques as called for in ASME PTC 38 "Determining
the Concentration of Particulate Matter in a Gas
Stream." For particulate loading an actual sample
should be taken and analyzed in accordance with ASME
PTC 28, "Determining the Properties of Fine
Particulate Matter" or in accordance with EPA 40 CFR
60, Appendix A, Method 5 or Method 17 or applicable
local standard.
3. If off-design conditions exist, the following
relationships are available for estimation purposes:
For Variable Gas Flow Rate:
100 - Eff (1) = [Q(2)] 0.5
100 - Eff (2)
[Q(1)] 0.5
For Constant Gas Flow Rate:
100 - Eff (1) = [U(2)] 0.5
100 - Eff (2)
[U(1)] 0.5
For Variations in Gas Density:
100 - Eff (1) = [Pp-Pg(2)] 0.5
100 - Eff (2)
[Pp-Pg(1)] 0.5
For Moderate Changes In Gas Particulate Loadings:
100 - Eff (1) = [C(2)] 0.183
100 - Eff (2)
[C(1)] 0.183
Eff:
Collector Efficiency
Pp:
Particulate Density
Q:
Volume Flow Rate
Pg:
Gas Density
U:
Gas Viscosity
C:
Particulate Concentration
1,2:
Operating Conditions (Mass Per Unit Volume)
4. Mechanical cyclone type dust collectors should
be able to handle up to 120 percent of inlet flue
gas volume.
SECTION 15861N
Page 16
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