内蒙古褐煤热解半焦燃烧特性研究 -

为实现内蒙古乌拉盖褐煤的高效利用,以粒度小于6 mm乌拉盖褐煤为原料,用马弗炉模拟工业炭化炉热解条件,制取了乌拉盖褐煤中低温热解半焦,测定了热解半焦的工业分析、发热量、哈氏可磨性指数,分析了半焦的燃烧动力学,研究了热解条件与半焦燃烧特性之间的关系。结果表明:热解终温对乌拉盖褐煤热解半焦燃烧特性影响最大,升温速率和保温时间对半焦燃烧特性影响不显著。乌拉盖褐煤热解半焦反应活化能随热解终温、保温时间的升高而增加,燃烧特性指数随热解终温、保温时间的升高而降低。热解终温为600℃时产生的半焦具有最高发热量24.50 MJ/kg,比原煤提高77%;燃烧特性指数最高为1.4×10-7%2/(min2·℃3),适宜燃料比为7~9,是很好的燃料。 In order to use Wulagai lignite(Inner Mongolia) efficiently,taking-6 mm Wulagai lignite as raw material,the test prepared the Wulagai lignite semi-coke in muffle which was used to simulate the industrial carbonization furnace.Then the proximate analysis,calorific value,grindability index,combustion dynamics of semi-coke,relationship between pyrolysis condition and semi-coke combustion characteristics were researched.The results showed that,the final temperature of pyrolysis was the main influencing factor,the influence of heating rate and holding time ware not significant.The reaction activity of semi-coke improved with the rise of final temperature and heat preservation time,while the influence on combustion characteristics index was opposite.The semi-coke which was obtained at 600 ℃ pyrolysis had superior calorific value of 24.50 MJ / kg which was 77% higher than that of raw coal.The combustion characteristics index were1.4 × 10-7%2/(min2·℃3),the suitable fuel ratio R ranged from 7 to 9,which was a fine fuel