Suppression of fine ash formation in pulverized coal flames. Final technical report, September 30, 1992--January 31, 1996

Technical Report · Fri Jul 19 04:00:00 EDT 1996

DOI:https://doi.org/10.2172/415968· OSTI ID:415968

Kramlich, J C; Chenevert, B; Park, Jungsung; Hoffman, D A; Butcher, E K

Coal ash, and particularly fine fly ash, remain one of the principal practical and environmental problems in coal-based power generation. In particular, submicron aerosols are identified with direct inhalation risk. Submicron ash is thought to arise from mineral vaporization during char combustion, followed by nucleation, condensation and coagulation to yield an aerosol. While aerosols are predominantly made out of volatile alkali minerals, they also can include refractory oxides that are chemically reduced to more volatile forms within the char particle and vaporized. Most of the ash of size greater than 1 {mu}m is generated by agglomeration of mineral as the char particle bums out. These two principal mechanisms are thought to account for most of the ash generated in coal combustion. Previous research has shown that various forms of coal treatment can influence the yields of fine ash from combustion. The research reported here investigates various forms of treatment, including physical coal cleaning, aerodynamic sizing, degree of grinding, and combinations of these on both aerosol yields and on yields of fine residual ash (1-4 {mu}m). The work also includes results from the combustion of artificial chars that include individual mineral elements. This research shows that these various forms of coal treatment can significantly change ash characteristics. While none of the treatments affected the bulk of the residual ash size distribution significantly, the yield of the ash aerosol mode (d<0.5 {mu}m) and fine residual ash mode (1-4 {mu}m) are changed by the treatments.

• Research Organization: Washington Univ., Seattle, WA (United States). Dept. of Mechanical Engineering
• Sponsoring Organization: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
• DOE Contract Number: FG22-92PC92548
• OSTI ID: 415968
• Report Number(s): DOE/PC/92548--T15; ON: DE97050022
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ASHES
COAL
COMBUSTION PRODUCTS
EXPERIMENTAL DATA
PARTICULATES
PROGRESS REPORT
PULVERIZED FUELS
SIZE
YIELDS