E

a Data from EPA, Compilation of Air Pollutant Emission Factors, AP-42, Fifth ed., U.S. Environmental Protection Agency, U.S. Government Printing Office, Washington, D.C., January 1995. Factors represents uncontrolled emissions, unless otherwise specified, and should be applied to coal feed, as fired. Tons are short tons.

fcBased on EPA Method 5 (front half catch). Where particulate is expressed in terms of coal ash content, the A factor is determined by multiplying weight percent (wt.%) ash content of coal (as fired) by the numerical value preceding the A. For example, if coal with 8% ash is fired in a PC-fired, dry-bottom unit, the particulate matter emission factor would be 10 x 8, or 80 lb/ton. cNo data found; emission factor for PC-fired, dry-bottom boilers used.

dUncontrolled particulate emissions, when no fly ash reinjection is employed. When control device is installed, and collected fly ash is reinjected to boiler, particulate from boiler reaching control equipment can increase up to a factor of 2.

eAccounts for fly ash settling in an economizer, air heater, or breaching upstream of control device or stack. (Particulate directly at boiler outlet typically will be twice this level). Factor should be applied even when fly ash is reinjected to boiler form air heater or economizer dust hoppers.

f Includes traveling-grate, vibrating-grate, and chain-grate stokers.

gAccounts for fly ash settling in breaching or stack base. Particulate loadings directly at boiler outlet typically can be 50% higher.

hAccounts for fly ash settling in breaching downstream of boiler outlet. iNo data found; emission factor for underfeed stoker was used.

jNo data found; emission factor for spreader stoker with multiple cyclones and reinjection was used.

0 0

Post a comment