Low Btu Coal Gas Combustion Emission Characteristics

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Abstract
Information presented in this paper is directed to individuals concerned with the emission characterization and control of process streams. Emissions from burning low Btu gas from an experimental gasifier were sampled and characterized. Both particulate and vapor samples were collected. Transmission electron micrographs showed that the particles were single droplets less than 1 μm in diameter. Size distributions of aerosols as measured by the electrical aerosol analyzer showed a bimodal distribution. Energy dispersive X-ray analysis and ion chromatography analyses indicated that SO4 -2 was the major component of the aerosol. This suggested that the combustion aerosol from low Btu gas may be sulfuric acid droplets or other sulfates produced from oxidation of H2S in the combustion process. Particulate mass loadings were estimated to be 0.1 and 0.0024 lb/106 Btu for H2S levels of 3600 and 500 ppm respectively. Some reduction of organic vapors in the combustion products was observed when the H2S level was reduced from 3600 to 500 ppm when a Holmes-Stretford sulfur reduction unit was in operation.

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