Nitric oxide emissions during the evolution of gasified char in the reduction layer during a grate-fired process |
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| Affiliation: | 1. School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin, Heilongjiang 150001, PR China;2. Anhui Special Equipment Inspection Institute, 45 Dalian Road, Baohe District, Hefei, Anhui 230051, PR China;3. College of Metallurgy and Energy, North China University of Science and Technology, 21 Bohai Road, Tangshan, HeBei 063210, PR China;1. Department of Climate Change Energy Engineering, Yonsei University, Seoul, 03722, South Korea;2. Blue Economy Strategy Institute Co. Ltd., Focus Building, 23-13, Hyoryeong-ro, 60-gil, Seocho-gu, Seoul, 06721, South Korea;3. Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, South Korea;4. Department of Mechanical Engineering, Seoul National University, Seoul, 08826, South Korea;5. Mechanical Engineering Department, Chung-Ang University, Seoul, 06974, South Korea;1. University Kasdi Merbah of Ouargla, Faculty of Applied Sciences, Department of Mechanical Engineering, Ouargla, Algeria;2. Lab. Dynamic Interactions and Reactivity of Systems, Kasdi Merbah University, Ouargla, 30000, Algeria;3. Institut Européen des Membranes, UMR 5635 ENSCM-UMII-CNRS, Montpellier, France;1. College of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, 411201, China;2. Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan, Hunan, 411201, China;3. Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province, Hunan University of Science and Technology, Xiangtan, Hunan, 411201, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China;2. The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu, 610500, China;3. College of Chemistry, Leshan Normal University, Leshan 614000, China |
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| Abstract: | This work examined the effects of CO2 gasification in the reduction layer on NO emissions during subsequent char combustion in the oxidation layer during a grate-fired process. In experimental trials, the pyrolysis char of Shenhua bituminous coal was initially gasified in CO2, employing different conversion rates so as to vary the residence time of the char in the reduction layer. The pore structure and degree of graphitization of the char were monitored and the effects of CO2 gasification on NO emissions were ascertained. In this manner, the relationship between the transformation of char nitrogen and the physicochemical characteristics of the char was clarified. The effects of CO2 gasification on the properties of the char and NO emissions in the subsequent oxidation layer were determined. The results show that CO2 gasification can improve the pore structure and degree of graphitization of the char, such that NO emissions are reduced in an inert atmosphere. However, the conversion rate of char nitrogen will increase in conjunction with oxidative combustion. |
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| Keywords: | Char Gasification NO Pore structure Graphitization degree |
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