摘要
对ＣａＯ颗粒脱硫反应用热重分析法进行了实验研究，ＣａＯ颗粒由国内有代表性的６种不同产地的石灰石加热分解制成。实验表明石灰石品种对脱硫反应有影响，在８７０℃时，ＣａＯ转化率在１７％～３６％之间。建立了ＣａＯ脱硫反应动力学数学模型，并计算了动力学参数，即反应速度常数Ｋｓ和产物层扩散系数Ｄｐ。在８７０℃时Ｋｓ为１．６４×１０（－８）～６．８６×１０－８ｍ４／（ｍｏｌ·ｓ），Ｄｐ为３．１５×１０（－１３）～１．６１×１０（－１２）ｍ２／ｓ。ＣａＯ脱硫表面化学反应的表观活化能为４２．６～５９．１ｋＪ／ｍｏｌ。
The desulfurization reaction of CaO particles was studied by means of thermogravimetric analysis method. CaO particles were calcined limestones which were from six typical areas in China. The experimental results show that the desulfurization reaction was affected by the type of limestone to some extent. CaO conversions were between 17% and 36% at 870℃. The kinetic parameters, rate constant Ks for surface reaction and diffusivity Dp of reactant gas in product layer, were calculated by a mathematical model. The value of Ks ranges from 1. 64×10-8 to 6. 86×10-8m4/(mol·s) and that of Dp, from 3. 15 ×10-13 to 1. 61× 10-12m2/s at 870℃. The apparent activation energy for the gas-solid surface chemical reaction of CaO with SO2 is in the range of 42. 6～59. 1 kJ/mol.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
1996年第4期93-97,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金
国家"八五"科技攻关项目
关键词
CAO
脱硫
动力学参数
数学模型
化学反应
煤
CaO, desulfurization reaction, kinetic parameter, mathematical model
