流化床气化炉半焦细粉的燃烧特性及其动力学研究  

Combustion property and kinetics of fine chars derived from fluidized bed gasifier

作　　者：景旭亮[1,2] 王志青[1] 张乾[1,2] 房倚天[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049

出　　处：《燃料化学学报》2014年第1期13-19,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21106173);中国科学院战略性先导科技专项(XDA07050100);中国科学院山西煤炭化学研究所青年人才基金(2011SQNRC)

摘　　要：利用热天平研究了三种不同变质程度煤流化床气化半焦细粉的燃烧特性,考察了灰分对燃烧行为的影响,同时采用三种不同的动力学计算方法对其燃烧动力学进行了分析。研究结果表明,挥发分的存在能显著降低低阶褐煤半焦细粉的着火点;高温下半焦细粉中矿物质的分解导致其DTG曲线出现较为明显的二次峰。细粉中的灰分对其燃尽性能和综合燃烧反应性都具有一定的抑制作用。动力学分析结果表明,燃烧活化能随转化率的增加而增加;三种常用动力学分析方法中,Vyazovkin对半焦细粉的燃烧拟合效果最好。The combustion properties of 3 fine chars derived from fluidized bed gasification of coals with different rank were studied in a thermogravimetric analyzer （TGA）. In addition, the influence of ash on combustion reactivity was investigated, and the processes were analyzed using three kinetic methods to obtain the kinetic parameters. The results suggest that the existence of volatile in fine char from low-rank lignite reduces its ignition temperature, while the decomposition of inherent minerals at relatively high temperature leads to a second peak in the DTG curve. The ashes of fine chars have an inhibiting influence on burn-out ability and comprehensive combustion reactivity. The kinetic analysis indicates that the activation energy increases with the increasing burnout extent. Compared with Coats-Redfern and Ozawa-Flynn-Wall methods, the Vyazovkin method fits the experiment results best.

关 键 词：流化床 半焦细粉 燃烧动力学 

分 类 号：TQ534[化学工程—煤化学工程]