生物质与不同变质程度煤混合燃烧特性的研究

采用TG／DTG／DTA技术研究了不同变质程度煤(褐煤、烟煤和无烟煤)、生物质(小麦秸秆和玉米芯)以及煤和不同比例生物质的混合燃料的燃烧特性，升温速率为15c／min，温度范围为25～900℃，分析了燃烧特征参数如着火温度、燃烧速率最大时的温度、燃尽温度和最大燃烧速率以及燃烧特性指数．采用Freeman-carroll(FC)法计算了燃烧动力学参数．结果表明，生物质和煤相比具有较低的燃烧特征温度和较快的燃烧速率；在褐煤和烟煤中加入生物质后，燃烧特征温度降低，燃烧速率增大；无烟煤中加入生物质后，对其着火温度影响较小，燃尽温度降低；此外，加入生物质后煤的燃烧表观活化能降低，表观活化能E与指前因子A存在动力学补偿效应。

Research on Combustion Characteristics of Biomass and Coals with Different Ranks

Combustion characteristics of three different ranks of coals (lignite, bituminous coal, and anthracite), two biomass materials(wheat straw and maize cob), and coal-biomass mixture were studied by using the TG/DTG/DTA technique. Combustion parameters such as ignition temperature, peak temperature of maximum weight loss rate, burnout temperature, maximum rate of combustion, and combustibility index were analyzed. The kinetic parameters were calculated based on experimental results and by using Freeman-carroll(FC) method. The results show that the combustion characteristic temperature of the biomass sample is lower and the maximum rate of combustion is faster than that of coal. And the combustion characteristic temperature decreases while the maximum rate of combustion increases with the addition of biomass materials for lignite and bituminous coals. As for anthracite , the ignition temperature change a little and burnout temperature decreases when biomass materials is added.