精细水煤浆的颗粒分形特征对燃烧特性的影响规律  

Impact of particle fractal dimension of ultra-clean micronized coal water slurry on its combustion characteristics

作　　者：周俊虎[1] 李艳昌[1] 程军[1] 刘建忠[1] 岑可法[1] 

机构地区：[1]能源清洁利用国家重点实验室(浙江大学),浙江杭州310027

出　　处：《化工学报》2007年第7期1805-1809,共5页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2004CB217701);长江学者和创新团队发展计划项目(IRT0434)~~

摘　　要：利用神华、兖州和淮南3种煤制备了精细水煤浆,并对精细煤粉颗粒的粒度分布与表面分形特征、精细水煤浆的流变特性和不同升温速率下的燃烧特性进行了研究。结果表明随着精细煤粉的表面分形维数增大,其比表面积增大,粒度、孔径均相应减小,相同浓度下的精细浆的表观黏度值上升,精细水煤浆的着火温度和燃烧反应活化能降低。其中表观黏度值以淮南精细浆与兖州精细浆增加较多,在100s-1下都增加了740mPa.s。着火温度和燃烧反应活化能都以淮南精细浆降低最多,其着火温度降低了41.36℃,燃烧反应活化能降低了77.71kJ.kmol-1。The particle size values of three ultra-clean micronized coal water slurry, Huainan, Yanzhou, Shenhua, were measured with Malvern Mastersizer 2000 laser mastersizer. Their combustion characteristics were investigated with TGA/SDTA851e/LF1 1600 thermobalance at heating rates of 12.5, 25, 33.3 and 50 ℃ · min^-1 .Their apparent viscosities were measured with HAAKE VT550 viscometer. The specific area and pore diameter of the ultra-clean micronized coal powder were analyzed with Autosorb-1-C physisorption analysis instrument. Experimental investigation and theoretical analysis proved that the specific area of the ultra-clean micronized coal powder increased while pore diameter and particle size decreased with increasing fractal dimension. The apparent viscosity of the ultra-clean micronized coal water slurry increased with increasing fractal dimension. The ignition temperature and apparent activation energy of the ultra-clean micronized coal water slurry decreased with increasing fractal dimension. The ignition temperature of Huainan ultra-clean micronized coal water slurry decreased by 41.36℃and its apparent activation energy decreased by 77.71 kJ · kmol^-1.

关 键 词：精细水煤浆 表面分形 燃烧特性 

分 类 号：TQ53[化学工程—煤化学工程]