摘要
采用部分烧结晶粒模型建立了燃煤过程中CaO固氟反应的数学模型 ;并在WCT 1型热天平上对CaO固氟反应特性进行了试验研究 ,结果表明 ,CaO/HF反应对HF为一级 ,本征反应和产物层扩散活化能分别为 18 73kJ/mol和 32 4 6kJ/mol。分析了反应温度、HF浓度、煤颗粒微孔结构等对CaO转化率的影响 ,经与热重实验结果比较表明 ,计算值与实验值基本吻合。
The partially sintered sphere model was used to describe the fluorine retention reaction process of CaO during coal combustion, which takes into the structural changes due to the combined effects of sintering and differences in molar volume between solid reactants and solid products The fluorine retention characteristics of CaO was investigated by thermogravimetric analysis, and the activition energy of surface reaction and product layer diffusion were 18 73?kJ/mol and 32 46 ?kJ/mol respectively The influence of reaction temperature, HF concentration and microstructure on CaO conversion was analyzed The predicted values are in good agreement with experimental results, which shows that the partially sintered sphere model is applicable to describe the fluorine retention process of CaO during coal combustion
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2002年第2期103-107,共5页
Journal of Fuel Chemistry and Technology
关键词
氧化钙
煤
燃烧
固氟反应
数学模型
CaO
coal
combustion
fluorine retention reaction
mathematical model
