Experimental study of influence of temperature on fuel-N conversion and recycle NO reduction in oxyfuel combustion |
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| Authors: | Shaozeng Sun Huali Cao Hao Chen Xiaoyu Wang Juan Qian Terry Wall |
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| Affiliation: | 1. Combustion Engineering Research Institute, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, PR China;2. Chemical Engineering, University of Newcastle, NSW 2308, Australia;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. University of Science and Technology of China, Hefei 230026, China;4. State Key Laboratory of High-temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China;2. Department of Chemical Engineering, University of Utah, Salt Lake City, UT 84112, USA;3. Institute of Energy and Power Engineering, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;1. Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;2. Centre for Combustion and CCS, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK |
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| Abstract: | Coal combustion in O2/CO2 environment 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/CO2 is lower than that in O2/N2. In O2/CO2 atmosphere, 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. |
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