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加氢热解煤焦的二氧化碳和水蒸气气化特性
引用本文:仲冰冰,张杰,王杰.加氢热解煤焦的二氧化碳和水蒸气气化特性[J].医学教育探索,2015(1):15-22.
作者姓名:仲冰冰  张杰  王杰
作者单位:华东理工大学能源化工系,煤气化与能源化工教育部重点实验室, 上海 200237;华东理工大学能源化工系,煤气化与能源化工教育部重点实验室, 上海 200237;华东理工大学能源化工系,煤气化与能源化工教育部重点实验室, 上海 200237
基金项目:国家“863”科学研究项目(2011AA05A201);国家自然科学基金项目(21376080)
摘    要:采用热重分析仪研究了云南玉溪煤和新疆准东煤的加氢热解煤焦二氧化碳气化反应性,考察了成焦压力、停留时间及气氛对煤焦气化反应性的影响,并利用均相模型计算了各煤焦的非等温气化动力学参数。采用实验室固定床反应器,研究了上述两种煤加氢热解煤焦的水蒸气气化特性,考察了成焦气氛对煤焦气化速率和气体产物组成的影响。热重气化实验表明,准东煤焦的气化反应性明显好于玉溪煤焦,前者的反应活化能远小于后者的反应活化能;无论哪种煤,加氢热解煤焦的气化反应性随加氢过程碳转化率的增大呈下降趋势;在相近的碳转化率下,加氢热解煤焦的气化反应性明显好于氮气气氛热解所得煤焦。在水蒸气气化的情况下,准东煤焦的气化反应性同样好于玉溪煤焦。总体上准东加氢热解煤焦的产氢率相比氮气气氛热解所得煤焦有所增加,不过对于这两种煤焦,随着气化温度提高,H2与CO的物质的量之比均逐渐接近于热力学平衡所得的计算值。

关 键 词:加氢煤焦    气化反应性    动力学
收稿时间:9/5/2014 12:00:00 AM

Gasification Characteristics of Hydropyrolytic Chars with Carbon Dioxide and Steam
ZHONG Bing-bing,ZHANG Jie and WANG Jie.Gasification Characteristics of Hydropyrolytic Chars with Carbon Dioxide and Steam[J].Researches in Medical Education,2015(1):15-22.
Authors:ZHONG Bing-bing  ZHANG Jie and WANG Jie
Institution:Department of Chemical Engineering for Energy, East China University of Science and Technology, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai 200237, China;Department of Chemical Engineering for Energy, East China University of Science and Technology, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai 200237, China;Department of Chemical Engineering for Energy, East China University of Science and Technology, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai 200237, China
Abstract:The gasification reactivities of the hydropyrolytic chars obtained from Yunnan Yuxi coal and Xingjiang Zhundong coal were investigated by TGA using carbon dioxide as a gasifying agent. The influences of pyrolysis pressure, residence time and atmosphere on the char reactivities were studied, and the kinetic parameters of non isothermal char gasification were calculated by the homogeneous model. The gasification characteristics of the hydropyrolytic chars obtained from the above mentioned two coals were further investigated on a laboratory fixed bed reactor using steam as a gasifying agent, focusing on the effects of coke atmosphere on the gasification rate and gas compositions. TGA results showed that the hydropyrolytic chars derived from Zhundong coal had considerably better reactivity with lower activation energy than those from Yuxi coal. For both coals, the gasification reactivities of hydropyrolytic chars decreased as the carbon conversion obtained in the hydropyrolysis increased. The hydropyrolysis was beneficial to promote the reactivity of char compared to the pyrolysis under N2 atmosphere with a close carbon conversion. In the case of steam gasification, the gasification reactivity of Zhundong coal char was better than that of Yuxi coal char. Overall the Zhundong hydropyrolytic char had a higher hydrogen yield than that obtained under N2 atmosphere. However, for both chars, the molar ratio of H2 to CO approached to the calculated data under thermodynamic equilibrium with increasing the gasification temperature.
Keywords:hydropyrolytic char  gasification reactivity  kinetics
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