Journal
APPLIED THERMAL ENGINEERING
Volume 160, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.113993
Keywords
Semi-coke; Coal; Co-combustion; Drop tube furnace; NOx; Burnout rate
Funding
- National Natural Science Foundation of China [51761125011]
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Combustion and NOx emission characteristics of a bituminous coal (BC) blended with semi-coke (SC) are investigated using a Thermogravimetric Analyzer (TGA) and Drop Tube Furnace (DTF) at a different SC blending ratio X-sc TGA results show that BC and SC have similar mass loss patterns but BC-SC blends have a second trough on their DTG curves. The addition of semi-coke increases ignition and burnout temperatures of the blends, but barely affects the burnout rate. Within 95% mass loss, the overall combustion index first decreases and then increases with X-sc. DTF results reveal that the burnout rate and NOx emission of BC-SC blends are influenced by excess air ratio, furnace temperature, blending ratio and residence time. With sufficient air and residence time, the burnout rates of BC-SC blends and SC can be greater than 97% and SC blending slightly decreases the total NOx formation. Under O-2-deficit conditions, the burnout rate decreases with increasing X-sc; SC blending and longer residence time will reduce NOx emission. The trends are significantly more obvious at smaller excess air ratios. The NOx formation of BC-SC blends cannot simply be predicted by linear superposition of the two fuels. Based on the burnout and NOx emission data, less than 40% SC blending and proper air staging are recommended for BC-SC co-combustion.
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