Particulate Emission Measurements From Small Emergency Power Sources

Stack measurements of particulate emissions from small stationary gas turbine engine alternators (0.75 and 2.5 MW) used as emergency power sources have been performed. Liquid impingement, dry filtration, and multiple-jet cascade impaction measurement techniques were employed. The particulate emissions are characterized by submicron particle sizes and relatively uniform particulate concentration profiles across the stack. Comparative particulate concentrations representative of the filter alone, and of the LA and EPA methods indicate that condensible particulates collected by liquid impingement and water soluble particulates extracted from the sampling probe washings can comprise over 50 percent of the total collected particulate. Analysis of the combined probe-impinger residue reveals that 60–75 percent of this particulate is water soluble. Turbine inlet measurements suggest that a significant fraction of the total exhaust particulate collected by liquid impingement can be ingested into these engines along with the inlet air.