Laboratory-scale combustion of coal-water mixtures

✍ Scribed by Douglas C. Rawlins; Geoffrey J. Germane; Paul O. Hedman; L.Douglas Smoot

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 824 KB
• Volume: 63
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(86)90111-2

✦ Synopsis

A detailed study of the combustion of coal-water mixtures (70-73% coal, 27-30% water) and formation of nitrogen-containing pollutants has been performed in a vertical, laboratory-scale combustor. Space-resolved, local measurements of solid and gaseous combustion products were made with a stainless steel, waterquenched probe to determine the percentage of coal burnout and local gaseous composition at various locations within the reactor. Rapid mixing of the gas and particle streams eliminated fuel-rich regions within the reactor. Carbon monoxide was found only near the inlet region of the reactor with the highest concentration being 0.8%. Particle residence time in the reactor was estimated to be about 100 ms, with coal burnout (daf) ranging from 82 to 98% as secondary air swirl number and stoichiometric ratio were varied. The only nitrogencontaining pollutant found was nitrogen oxide, with the exit concentrations ranging from 180 to 750 ppm.