Burning low volatile coals in utility boilers with high efficiency and clean environment
Conference
·
OSTI ID:324646
- Babcock and Wilcox (United States)
Low grade coals, such as anthracites and semi-anthracites as well as lean coals, contain lower volatile matters (VM), while the moisture and ash contents are sometimes high. The conventional pulverized coal boilers and burners can not burn such fuel well due to the difficulties of the ignition, flame stability and carbon conversion. The boilers burning such fuels have a lower efficiency, and high unburned carbon in the fly ash. The boiler load turn down range is poor while the minimum load without oil support is high. Under the government energy policy of most developing countries, the utility industry is requested to burn more low VM coals. To successfully burn such fuels, the enhanced ignition and flame stabilization and longer residence time in the furnace are the key technical points. The downshot firing with w-shape flame furnace plus low VM burner can meet the requirements. The environmental concerns burning low VM coals are more serious compared to the case of burning high grade coals (bituminous) by the same type furnace. The NOx emission level is much higher than bituminous. The available technologies for De-NOx during the combustion stage are too sensitive to the coal quality, and are still under development. At the current stage, most of the downshot firing with w-shape furnaces world wide are 300-350 MW in capacity. The fuels as fired are most likely blended fuels of anthracites and lean coals. More larger-capacity downshot w-flame furnaces are under development. Performance of operated downshot units in China is good.
- OSTI ID:
- 324646
- Report Number(s):
- CONF-970931--
- Country of Publication:
- United States
- Language:
- English
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