基于工业分析的恒温下煤粉燃尽特性预测模型

摘要

Combustion experiments were conducted for fourteen kinds of pulverized coal in high-temperature atmosphere on a self-made test rig,which could achieve thermal gravimetric measurement at constant temperatures.By introducing the combined parameters x1 and x2 of proximate analysis and the ratio KT2T1 of burnout time,the influence of proximate analysis and temperature on the burnout characteristics was analyzed,while the prediction model for burnout time was built.The model was then used to predict the burnout time of pulverized coal specimen at different temperatures,and the predicted results were subsequently compared with experimental data.Results show that the combined parameters x1 and x2 and the burnout time have a quadric relationship at different temperatures.For the same temperature rise,the higher the initial temperature is,the smaller the increase of early burning weight loss rate will be;the ratio KT2T1 of all pulverized coal has almost the same value at constant temperatures T1 and T2;the ratio KT2T1 is linearly related to lg T2 at constant temperature T1.The prediction model for burnout time is proved to be highly accurate.%利用自制恒温热重装置对14种电厂用煤粉在高温下进行燃烧实验.引入工业分析组合参数x1、x2和燃尽时间比值KT2T1,研究工业分析参数和温度对煤粉燃尽特性的影响,并在此基础上建立煤粉燃尽时间的预测模型,对检验煤粉在不同温度下的燃尽时间进行预测并与实验值进行对比.结果表明:不同温度下,组合参数x1、x2与煤粉燃尽时间均符合二次函数关系;当温升幅度相同时,初始温度越高,煤粉前期燃烧失重速率的增加幅度越小;相同的T1、T2下,不同煤粉的燃尽时间比值KT2T1基本相等;固定温度T1,燃尽时间比值KT2T1与lg T2符合线性关系;预测模型对煤粉燃尽时间的预测具有较高的准确度.