煤中矿物质对NO-半焦还原反应的影响  

INFLUENCE OF MINERAL MATTER IN COAL ON NO-CHAR REACTION

作　　者：赵宗彬[1] 李保庆[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

出　　处：《燃料化学学报》2001年第2期129-134,共6页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金! (2 98760 47) ;国家自然科学重点基金! (2 993 60 90 )&&

摘　　要：选用四种不同煤阶的煤 ,经过HCl/HF脱灰处理制得四种脱灰煤 ,95 0℃下热解制得原煤半焦和脱灰煤半焦。在石英固定床反应器上于常压条件下 40 0℃～ 95 0℃的温度范围内考察比较了原煤半焦和脱灰煤半焦还原NO的反应性 ,研究了煤中矿物质对NO 半焦还原反应的机理和反应动力学的影响。结果发现 ,煤中的矿物质一般对NO 半焦反应具有一定的催化作用 ,催化作用的大小与矿物质的含量和组成有关 ;钠、铁和钙等是矿物质中活性分 ,对NO 半焦反应具有催化作用 ;半焦还原NO的反应存在明显的双温区现象 ,低温反应机理与高温反应机理不同 ,活化能有明显差异。The NO-char reduction in the presence and absence of mineral matter was studied Four Chinese coals with different ranks from lignite to anthracite were demineralized with HCl/HF and the chars were prepared by devolatilizing the deashed coals and their original coals in a quartz fluidized-bed reactor NO reduction by the resulting chars was conducted in a quartz fixed bed at atmospheric pressure The results showed that alkali metal Na and alkali earth metal Ca catalyzed the NO-char reaction significantly However, the catalytic effect of Fe in the mineral matter was weak due to the inhibition of inert composition Kinetics data of NO-reaction reduction by coal chars in the presence and absence of mineral matter were obtained Two temperature regimes were found in the NO-char reaction, which suggested the mechanism shift in the transition temperature

关 键 词：矿物质 半焦 动力学 煤 还原反应 一氧化氮 燃烧 催化性能 

分 类 号：TQ534[化学工程—煤化学工程]