超细与常规煤粉燃烧动力学特性及计算分析

Experimental research and computation analysis of combustion kinetic characteristics of micro-pulverized and common-pulverized coal

采用热重-差热分析仪研究了元宝山褐煤与大同烟煤2个煤种常规粒度与超细粒度各4个煤样的燃烧特性,其升温速率均为30℃·min-1、所用气体为纯O2、气体流量均为80ml·min-1.根据试验数据计算了各试验煤样的综合燃烧特性指数和高、低温度段的燃烧动力学参数,用重量加权平均法计算了各煤样的平均表观活化能,重点讨论了常规粒度与超细粒度煤粉的燃烧特性的差异.

DTG-60H thermobalance was used to study combustion characteristics of samples from Yuanbaoshan and Datong with different average sizes. The heating rate was 30 ℃ · min^-1 , O2 flow rate was 80 ml · min^-1. Particle sizes of pulverized coals were analyzed by Malvern MAM5004 Laser Mastersizer, made in the United Kingdom. In terms of experimental data, the combustion process was divided into two regions as the low temperature region and high temperature region, and the chemical kinetic parameters of each region were determined. The differences of combustion characteristics between micro-pulverized and common-pulverized coal were discussed.