Suppression of fine ash formation in pulverized coal flames. Quarterly technical progress report No. 7, April 1, 1994--June 30, 1994
Technical Report
·
OSTI ID:10185298
One of the major obstacles to the economical use of coal is managing the behavior of its mineral matter. Ash size and composition are of critical importance for a variety of reasons. Fly ash size and emissivity affect radiant furnace heat transfer. Heat transfer is also affected by the tendency of ash to adhere to heat transfer surfaces, and the properties of these deposits. Removal of ash from flue gas by electrostatic precipitators is influenced by both particle size and particle resistivity. The efficiency of fabric filter-based cleaning devices is also influenced by ash size. Both types of devices have reduced collection efficiencies for smaller-sized particles, which corresponds to the size most efficiently retained in the alveolar region of the human lung. This special concern for finer sized particles has led to PM10 regulations in the last several years (PM10: particles of diameter less than 10 {mu}m). The goals of the present work are as follows: (i) Perform measurements on carefully characterized coals to identify the means by which the coal treatment increases aerosol yields. (ii) Investigate means by which coal cleaning can be done in a way that will not increase aerosol yields. (iii) Identify whether this mechanism can be used to reduce aerosol yields from systems burning straight coal.
- Research Organization:
- Washington Univ., Seattle, WA (United States). Dept. of Mechanical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-92PC92548
- OSTI ID:
- 10185298
- Report Number(s):
- DOE/PC/92548--T7; ON: DE95000394
- Country of Publication:
- United States
- Language:
- English
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