煤与生物质共热解的协同特性研究 -

通过对玉米秸秆和平顶山烟煤在不同粒度及升温速率下的热重分析,说明平顶山烟煤和玉米秸秆最大失重率对应的峰值温度分别为500℃和350℃左右,二者热解温差较大,无法形成协同作用;在达到相同失重量的情况下,热解温度越高,其升温速率也越高。在一定升温速率下,随着粒度的变化,玉米秸秆的热解温度变化不大,而平顶山烟煤的变化相对较大。通过对比实验1(将样品从常温加热至850℃并保温30 min)和实验2(直接放入850℃高温中并保温30 min)的挥发分,说明实验2的挥发性物质比实验1平均值升高约1.75%;随着混合物中煤质量分数的增加,实际挥发物质比理论挥发物质总体有升高趋势,说明生物质的存在对煤的热解有一定程度的协同作用。 The thermal gravimetric analysis of corn stalk and Pingdingshan bituminous coal of different particle size at various heating rate,show that the peak temperature corresponding to the maximum weight loss ratio of corn stalk and bituminous coal is around 350 ℃and 500 ℃,which vary considerably.When the weight loss is same,the higher the pyrolysis temperature,the greater the heating temperature.At certain heating temperature,with the change of particle size,the pyrolysis temperature of corn stalk vary less,while that of Pingdingshan bituminous coal is just the opposite.The procedure of NO.1 experiment is heating samples from normal temperature to 850 ℃,then keep warm for 30 minutes,the procedure of NO.2 experiment is keeping the samples warm at 850 ℃ for 30 minutes.Investigate the volatile component of these two experiments.The results show that,the NO.2 test is about 1.75 percent higher than NO.1 test.With the increase of bituminous coal in mixture,the real volatile component is higher than theoretical value,that means the biomass has cooperative effects on bituminous coal pyrolysis