SCI和EI收录∣中国化工学会会刊

›› 2008, Vol. 16 ›› Issue (4): 575-583.

• REACTION KINETICS, CATALYSIS AND REACTION ENGINEERING • Previous Articles     Next Articles

Investigation on Steam Gasification of High-metamorphous Anthracite Using Mixed Black Liquor and Calcium Catalyst

Gul-e-Rana JAFFRI, ZHANG Jiyu   

  1. Institute of Chemical Engineering and Technology, Fuzhou University, Fuzhou 350002, China
  • Received:2007-10-01 Revised:2008-01-17 Online:2008-08-28 Published:2008-08-28
  • Supported by:
    the National Natural Science Foundation of China(20376014);Fujian Science and Technology Council Grant(HG99-01)

Investigation on Steam Gasification of High-metamorphous Anthracite Using Mixed Black Liquor and Calcium Catalyst

Gul-e-Rana JAFFRI, 张济宇   

  1. Institute of Chemical Engineering and Technology, Fuzhou University, Fuzhou 350002, China
  • 通讯作者: ZHANG Jiyu, E-mail: jyzhang@fzu.edu.cn
  • 基金资助:
    the National Natural Science Foundation of China(20376014);Fujian Science and Technology Council Grant(HG99-01)

Abstract: The catalytic effects of single and mixed catalysts, i.e. single 3%Ca and 5%Na-BL(black liquor) catalysts and mixed 3%Ca+5%Na-BL catalyst, on carbon conversion,gasification reaction rate constant and activation energy,relative amount of harmful pollutant like sulphur containing gases have been investigated by thermogra-vimetry in steam gasification under temperature 750℃ to 950℃ at ambient pressure for three high-metamorphous anthracites (Longyan, Fenghai and Youxia coals in Fujian Province). The mixed catalyst of 3%Ca+5%Na-BL increases greatly the carbon conversion and gasification rate constant by accelerating the gasification reaction C+H2O→CO+H2 due to presence of alkali surface compounds [COM], [CO2M] and exchanged calcium phenolate and calcium carboxylate (COO)2. By adding CaCO3 into BL catalyst in gasification, in addition to improving the catalyst function and enhancing the carbon conversion, the effective desulphurization is also achieved, but the better operating temperature should be below 900℃. The homogenous and shrinking core models can be successfully employed to correlate the relations between the conversion and the gasification time and to estimate the reaction rate constant. The reaction activation energy and pre-exponential factor are estimated and the activation energy for mixed catalyst is in a range of 98.72-166.92 kJ·mol-1, much less than 177.50-196.46 kJ·mol-1 for non-catalytic steam gasification for three experimental coals.

Key words: mixed catalyst, calcium, black liquor, thermogravimetry, steam gasification kinetics, sulphur containing gas

摘要: The catalytic effects of single and mixed catalysts, i.e. single 3%Ca and 5%Na-BL(black liquor) catalysts and mixed 3%Ca+5%Na-BL catalyst, on carbon conversion,gasification reaction rate constant and activation energy,relative amount of harmful pollutant like sulphur containing gases have been investigated by thermogra-vimetry in steam gasification under temperature 750℃ to 950℃ at ambient pressure for three high-metamorphous anthracites (Longyan, Fenghai and Youxia coals in Fujian Province). The mixed catalyst of 3%Ca+5%Na-BL increases greatly the carbon conversion and gasification rate constant by accelerating the gasification reaction C+H2O→CO+H2 due to presence of alkali surface compounds [COM], [CO2M] and exchanged calcium phenolate and calcium carboxylate (COO)2. By adding CaCO3 into BL catalyst in gasification, in addition to improving the catalyst function and enhancing the carbon conversion, the effective desulphurization is also achieved, but the better operating temperature should be below 900℃. The homogenous and shrinking core models can be successfully employed to correlate the relations between the conversion and the gasification time and to estimate the reaction rate constant. The reaction activation energy and pre-exponential factor are estimated and the activation energy for mixed catalyst is in a range of 98.72-166.92 kJ·mol-1, much less than 177.50-196.46 kJ·mol-1 for non-catalytic steam gasification for three experimental coals.

关键词: mixed catalyst, calcium, black liquor, thermogravimetry, steam gasification kinetics, sulphur containing gas