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	Supersonic Cavity Flows over Concave and Convex Walls
	Ye, A. R., Das, R., Setoguchi, T. and Kim, H. D.1
	2016
关键词	Cavity flow Supersonic Flow Compressible Flow Unsteady flow Pressure Oscillation rectangular cavities oscillations Thermodynamics Engineering
中文摘要	To promote the utilization efficiency of coal resources, and to assist with the control of sulphur during gasification and/or downstream processes, it is essential to gain basic knowledge of sulphur transformation associated with gasification performance. In this research we investigated the influence of O-2/C molar ratio both on gasification performance and sulphur transformation of a low rank coal, and the sulphur transformation mechanism was also discussed. Experiments were performed in a circulating fluidized bed gasifier with O-2/C molar ratio ranging from 0.39 to 0.78 mol/mol. The results showed that increasing the O-2/C molar ratio from 0.39 to 0.78 mol/mol can increase carbon conversion from 57.65% to 91.92%, and increase sulphur release ratio from 29.66% to 63.11%. The increase of O-2/C molar ratio favors the formation of H2S, and also favors the retained sulphur transforming to more stable forms. Due to the reducing conditions of coal gasification, H2S is the main form of the released sulphur, which could be formed by decomposition of pyrite and by secondary reactions. Bottom char shows lower sulphur content than fly ash, and mainly exist as sulphates. X-ray photoelectron spectroscopy (XPS) measurements also show that the intensity of pyrite declines and the intensity of sulphates increases for fly ash and bottom char, and the change is more obvious for bottom char. During CFB gasification process, bigger char particles circulate in the system and have longer residence time for further reaction, which favors the release of sulphur species and can enhance the retained sulphur transforming to more stable forms.
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/113089]
专题	工程热物理研究所_Journal of Thermal Science_期刊论文
作者单位	1.[Zhang Hao 2.Xu Tiantian 3.Wang Yuxiang 4.Wang Yuancheng 5.Liu Xueting] Shandong Jianzhu Univ, Sch Thermal Energy Engn, Jinan 250101, Peoples R China. [Zhang Hao 6.Wang Yuancheng 7.Liu Xueting] Minist Educ, Key Lab Renewable Energy Utilizat Technol Bldg, Jinan 250101, Peoples R China. [Zhang Xinxin] Univ Sci & Technol Beijing, Dept Thermal Engn, Beijing 100083, Peoples R China.
推荐引用方式 GB/T 7714	Ye, A. R., Das, R., Setoguchi, T. and Kim, H. D.. Supersonic Cavity Flows over Concave and Convex Walls[J],2016.
APA	Ye, A. R., Das, R., Setoguchi, T. and Kim, H. D..(2016).Supersonic Cavity Flows over Concave and Convex Walls..
MLA	Ye, A. R., Das, R., Setoguchi, T. and Kim, H. D.."Supersonic Cavity Flows over Concave and Convex Walls".(2016).

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