预测混合煤燃烧性能的数学模型

Mathematical model for predicting combustion behavior of coal blends

用热重分析法研究了单种煤的DTG和TG曲线特征,建立了预测混合煤燃烧性能的数学模型。结果表明,各单种煤的DTG曲线呈单峰,峰值温度tmax与其燃料比F的对数呈线性相关关系,tmax=68.86ln(F)+512.2(℃)。由组成混合煤的单种煤的燃料比F可推断出混合煤的DTG曲线特征,从而预测混合煤的燃烧性能。如果混合煤的煤质指标满足标准煤的煤质指标要求,则当Fmax Fmin≤3.20时,混合煤的燃烧性能好;当3.20<Fmax Fmin≤5.71时,混合煤的燃烧性能中等;当Fmax Fmin>5.71时,混合煤的燃烧性能较差。

Defferential Thermogravimetry, Thermogravimetry characteristics of single coal were studied and mathematical model for predicting combustion behavior of coal blends was established. The results show that DTG curve of single coal displays one peak and the peak temperature, t_(max), relates to the fuel ratio F of the coal: t_(max)=68.86 ln(F)+512.2 (℃). The characteristics of DTG curves of coal blends can be obtained from that of single coal, which can be used to predict its combustion behavior. If the quality parameters of the coal blends meet the needs of the normative coal, its combustion behavior is good when F_(max)/F_(min)<3.20; it is middle when 3.20<F_(max)/F_(min)<5.71, and it is bad when F_(max)/F_(min)>5.70.