柠条与低阶煤共热解特性初探

Co-pyrolysis Characteristics of Caragana korshinskii Kom. and Low-rank Coal Blends

为研究柠条与低阶煤共热解特性及相互作用,利用热重分析仪研究了不同煤种和不同混合比例条件下,柠条与4种内蒙古盛产低阶煤的共热解。结果表明:不同煤种与柠条共热解相互作用趋势只在中温区表现不同,混合比例对共热解相互作用的大小有影响,对整个过程的相互作用趋势无影响。由作用率Δα的计算值得柠条与煤共热解过程的作用效果可分为4个阶段:在柠条剧烈失重温度段对应为第一、二阶段,先为煤粉抑制柠条挥发分的析出,后为柠条挥发分促进煤的热解;第三阶段,为柠条焦炭热解温度段,柠条焦炭与煤相互作用,受煤品种的影响,柠条与煤共热解为协同或抑制作用;第四阶段,为共热解过程的高温段,柠条灰分中的矿物质促进煤的热解。

The co-pyrolysis characteristics and interaction effect of four kinds of low rank coals abound in Inner Mongolia with Caragana korshinskii Kom.（NT） were investigated by using the thermo-gravimetric apparatus. The experimental results showed that the co-pyrolysis interaction trend of different varieties of coal and NT was only different in the middle temperature range. The mixing ratio affected the size of the co-pyrolysis interaction and didn51 affect the interaction trend of the whole process. According to the data of the action rate（Aa） ,the interaction effects of co-pyrolysis process could be divided into 4 stages. The temperature period of violent weight loss of desert shrub corresponded to the first and second stage. During these two stages,the coal inhibited the effusion of the volatile of NT firstly and then the volatile of NT promoted the pyrolysis of the coal. In the third stage of thepyrolysis of NT coke,the synergistic or inhibitory interactions between desert shrub coke and coal were influenced by coal species. Finally,in the high temperature section of co-pyrolysis process,NT ash minerals promoted the coal pyrolysis.