期刊
APPLIED THERMAL ENGINEERING
卷 67, 期 1-2, 页码 97-105出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2014.03.009
关键词
Down-fired furnace; Air-staging conditions; Staged air; OFA; NOx emissions
资金
- National Natural Science Foundation of China [51306167]
- Funds for Creative Research Groups of China [51121004]
To understand the deep-air-staging combustion performance and evaluate effects of staged air and overfire air (OFA) in regulating deep-air-staging conditions within a 600-MWe down-fired supercritical boiler, industrial-size measurements were performed in turn at three settings (i.e., damper opening partners of 30%:15%, 50%:15%, and 30%:40% for staged air and OFA, respectively). It was found that the staged-air effect on combustion and NOx emissions was opposite to that of OFA. At a shallow OFA opening of 15%, the furnace attained low carbon in fly ash of 4.47-5.24% and high NOx emissions of 1234-1360 mg/m(3) at 6% O-2. Under these circumstances, deepening air-staging conditions by increasing the staged-air damper opening from 30% to 50% essentially favored the NOx formation and improved burnout rate. With the staged-air opening fixed at 30%, opening OFA from 15% to 40%, on the contrary, acted as a positive role in strengthening air-staging conditions, i.e., reducing NOx emissions to levels of about 1000 mg/m(3) at 6% O-2 and raising combustible loss. The results suggested in the down-fired furnace, regulating deep-air-staging conditions to sharply reduce NOx emissions relied on opening OFA rather than staged air. (C) 2014 Elsevier Ltd. All rights reserved.
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