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

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

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

Gul-e-Rana JAFFRI, 张济宇

Institute of Chemical Engineering and Technology, Fuzhou University, Fuzhou 350002, China

收稿日期:2007-10-01 修回日期:2008-01-17 出版日期:2008-08-28 发布日期:2008-08-28
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)

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

Gul-e-Rana JAFFRI, ZHANG Jiyu

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)

摘要/Abstract

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

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

Gul-e-Rana JAFFRI, 张济宇. Investigation on Steam Gasification of High-metamorphous Anthracite Using Mixed Black Liquor and Calcium Catalyst[J]. , 2008, 16(4): 575-583.

Gul-e-Rana JAFFRI, ZHANG Jiyu. Investigation on Steam Gasification of High-metamorphous Anthracite Using Mixed Black Liquor and Calcium Catalyst[J]. , 2008, 16(4): 575-583.

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

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

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