Coal combustion and heavy metals pollution
Book
·
OSTI ID:549542
- VSB-Technical Univ., Ostrava (Czech Republic)
Combustion of coal may be an important source of heavy metals pollution. The major environmental risks of heavy metals are connected to their toxicity and mobility in the environment. In the flame, heavy metals are re-distributed with respect to their volatility. Enrichment of fine particles by volatile metals is the most important mechanism for most of the metals. Nevertheless, Hg is emitted mainly in gaseous form and some metals like Mn are concentrated rather in coarse particles. Heavy metals pollution caused by emissions from combustion of coal may be decreased by fine particles removal; other possibilities (metals extraction from the coal, changes of condition in the flame) are limited. Fly ashes from the most important Czech power plants were examined with respect to the heavy metals content. The easily leachable elements with high volatility in the flame (arsenic, zinc, lead) were recognized as the most important fly ash pollutants. The average concentrations of these metals in fly ash were: bituminous coal 46{+-}18 ppm As, 196{+-}93 ppm Zn, 126{+-}46 ppm Pb; brown coal 283{+-}260 ppm As, 60{+-}28 ppm Pb and 212{+-}116 ppm Zn. When ESP and cyclones are used in series, fly ashes from ESP have higher concentration of volatile heavy metals, mainly Pb, Zn and As. Presence of chlorine in fuel increases the volatility of metals.
- OSTI ID:
- 549542
- Report Number(s):
- CONF-960954--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Heavy metals and coal combustion
Heavy metal behavior during circulating fluidized bed combustion of willow (Salix)
Heavy metals and coal combustion
Conference
·
Wed Jul 01 00:00:00 EDT 1998
·
OSTI ID:20013001
Heavy metal behavior during circulating fluidized bed combustion of willow (Salix)
Conference
·
Thu Jul 01 00:00:00 EDT 1999
·
OSTI ID:20006714
Heavy metals and coal combustion
Conference
·
Tue Mar 31 23:00:00 EST 1998
·
OSTI ID:585430