- Title
- Experimental study of influence of temperature on fuel-N conversion and recycle NO reduction in oxyfuel combustion
- Creator
- Sun, Shaozeng; Cao, Huali; Chen, Hao; Wang, Xiaoyu; Qian, Juan; Wall, Terry
- Relation
- Proceedings of the Combustion Institute Vol. 33, Issue 2, p. 1731-1738
- Publisher Link
- http://dx.doi.org/10.1016/j.proci.2010.06.014
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2011
- Description
- Coal combustion in O₂/CO₂environment was examined with a bituminous coal in which the gas-phase and char combustion stages were considered separately. The effects of temperature (1000–1300°C) and the excess oxygen ratio λ(0.6–1.4) on the conversion of volatile-N and char-N to NOx were studied. Also, the reduction of recycle NOx by fuel-N was investigated under various conditions. The results show that fuel-N conversion to NO in O₂/CO₂is lower than that in O₂/N₂. In O₂/CO₂atmosphere, the volatile-N conversion ratios vary from 1–7% to 15–24% under fuel-rich and fuel-lean conditions, respectively. The char-N conversion ratios are 11–28% and 30–50% under fuel-rich and fuel-lean conditions, respectively. The influences of temperature on the conversion of volatile-N to NO under fuel-rich and fuel-lean conditions are contrary. A significant difference for char-N conversion in fuel-rich and fuel-lean conditions is observed. The experimental data of recycle NO reduction indicate that the reduction of recycle NO by gas-phase reaction can be enhanced by volatile-N addition in fuel-lean condition at high temperature, while in fuel-rich condition, the volatile-N influence cancelled out and the overall impact is small. NO/char reaction competes with the conversion of fuel-N to NO at higher temperatures.
- Subject
- fuel nitrogen; recycle NO; O₂/CO₂combustion; oxyfuel
- Identifier
- http://hdl.handle.net/1959.13/1065106
- Identifier
- uon:17777
- Identifier
- ISSN:1540-7489
- Language
- eng
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