多煤种混煤燃烧特性和动力学研究

Study of the Combustion and Dynamic Characteristics of a Multiple Coal-rank-blended Coal

利用SDTQ-600热重差热分析仪,对由不同比例的3种单煤组成的混煤进行热失重试验,研究了混煤燃烧特性和动力学特性。试验结果表明:混煤的挥发分初析温度和着火温度随挥发分含量高的单煤比例的提高而降低,最大失重率随混煤含碳量的增加而增大;利用Gorbatchev积分式和一级反应动力模型对混煤活化能和频率因子进行了求解,求解过程中动力学曲线拟合较好;混煤煤种相同时,混煤活化能与挥发分含量、活化能与着火温度呈良好的线性关系,当混煤中缺少某一种单煤时,这种线性关系会被破坏。

By using a SDTQ-600 type temperature-difference-thermogravimetric analyzer,a thermogravimetric experiment was conducted of a blended coal composed of three single coal ranks in various proportions.The combustion and dynamic characteristics of the blended coal were studied.The test results show that the initial precipitation and ignition temperature of the volatile component of the coal will decrease with an increase of the proportion of the single coal rank with a highest volatile content and the maximum weight loss rate will increase with an increase of the carbon content of the coal.The Gorbatchev integral formulae and a dynamic model for primary reactions were used to seek solutions to the activation energy and frequency factor of the coal,during which the solutions are in relatively good agreement with the dynamic curves.When the coal ranks consisting of the blended coal are identical,the activation energy and volatile content of the blended coal as well as its activation energy and ignition temperature assume a good linear relationship.When the blended coal is in short of any single coal rank,such linear relationships will be destroyed.