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 thermogravimetry in steam gasification under temperature 750℃ to 950℃ at ambient pressure for three high-metarnorphous 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 surfacecompounds [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 acUvaUon 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.
单个、混合的催化剂的催化效果，即单个 3%Ca 和 5%Na-BL (黑白酒)催化剂和混合 3%Ca+5%Na-BL 催化剂在碳变换上，气化反应率常数和激活精力，象包含气体的硫一样的有害污染物质的相对数量被 thermogravimetry 在温度 750 掳C 下面在蒸气气化调查了到 950 掳C 在为三 high-metamorphous anthracites (在福建省的 Longyan ， Fenghai 和 Youxia 煤)的周围的压力。3%Ca+5%Na-BL 的混合催化剂极大地由由于碱表面混合物的存在加速气化反应 C+H2O 鈫 ? CO+H2 增加碳变换和气化率常数[COM ] ，[CO2M ] 并且交换的钙 phenolate 和钙羧化物(鈥擟O O ) 2。由在气化增加 CaCO3 进 BL 催化剂，除了改进催化剂功能并且提高碳变换，有效 desulphurization 也被完成，但是更好操作的温度应该在 900 掳 C 下面。同质、缩小的核心模特儿能成功地被雇用到在变换和气化之间的关系预定并且评价估计反应的相互关联经常。反应激活精力和 pre 指数的因素被估计，为混合催化剂的激活精力在 98.72-166.92 kJ 路 m ol 的一个范围 ? 1，不到 177.50-196.46 kJ 路 m ol ? 1 为为三试验性的煤的非催化的蒸气气化。
基金
Supported by the National Natural Science Foundation of China （20376014） and Fujian Science and Technology Council Grant （HG99-01 ）.
