印尼褐煤湿煤末(煤泥)热解和燃烧特性及动力学分析

Pyrolysis /combustion characteristics and kinetic analysis of Indonesia lignite sludge

为获得印尼褐煤湿煤未(煤泥)热解燃烧的反应机理,采用热重法研究了印尼褐煤湿煤末在不同加热速率下的热解和着火燃烧过程,得到热解和燃烧反应特征参数;并采用Coats-Redfern积分法进行动力学分析。结果表明:升温速率对热解和燃烧反应特征温度和其他特征参数基本都有正相关的影响。对于热解过程,反应线性拟合结果呈明显的三段式分布,不同升温速率下质量平均表观活化能分别为43.2,33.2和33.9 kJ/mol。相同转化率区间内,试样热解活化能与升温速率关系不大;而在同一升温速率下,试样热解反应活化能随转化率的增加而增加,呈正相关性。与热解反应不同,燃烧反应动力学参数在整个反应区间直接线性拟合结果较好。10,30和50℃/min升温速率下的反应分别为2级、1.5级和1.5级化学反应,活化能分别为101.74,72.93和51.82 kJ/mol。

In order to obtain mechanisms of pyrolysis and combustion of Indonesia lignite sludge and provide direction for its industrial reuse, the thermogravimetric （TG）analysis method to study the pyrolysis and combustion process of In- donesian lignite sludge was adopted under different heating rate, and the characteristic parameters were discussed. Ki- netic analysis was performed by the Coats-Redfern method. The results show that heating rate has positive effects on characteristic parameters. For pyrolysis process, TG data fit linearly in three different but continuous regions. The weighted mean activity energy is 43.2,33.2 and 33.9 kJ/mol separately under different heating rates. For the same conversion region, the activity energy keeps almost unchanged under different heating rates ;while at the same heating rate, the activity energy of pyrolysis increases with conversion rate. For combustion process, the data fit linearly quite well over the whole reaction process. The reaction order for 10,30 and 50 ℃/min is 2,1.5 and 1.5 respectively, while the activity energy is 101.74,72.93 and 51.82 kJ/mol respectively.