稻壳和褐煤热解特性的初步研究

摘要

利用TG-DSC联用分析稻壳与褐煤热解过程中热失重规律及吸放热情况,结果发现,稻壳的热失重率较大,共热解失重过程相当于二者单独热失重过程的叠加.通过DSC曲线分析稻壳与褐煤热解过程的吸放热量显示,与二者单独热解过程不同的是共热解在高温热分解阶段须吸收大量的热量.利用气相色谱分析不同温度下稻壳与褐煤热解气体产物各组分比例,并与热失重过程相对应分析气体产物变化规律,结果发理,H2和CH4气体组分变化规律相同；与褐煤热解相比,稻壳热解气体产物中CO气体组分较多.总体而言,共热解产物是二者单独热解产物的简单加和,但共热解过程吸放热量变化却显示二者存在热量交换和相互影响.%The pyrolytic characteristics of rice husk and lignite were investigated by using the TG-DSC. Result demonstrated that the thermal weight loss of rice husk was more intense than lignite. The eo-pyrolysis weight loss process was almost the summation of rice husk and lignite pyrolysis weight loss process respectively. The absorbing and releasing heat of pyrolysis prosess was analyzed through DSC curves. There needed more heat-absorption at high temperature pyrolytic process during co-pyrolysis. Gas products content of pyrolytic system were also determined by gas chro-matography as the temperature changed. Variations of gas products were analyzed combining TG curves. The results showed that H2 and CH4 content had the similar trend with the temperature grew when pyrolysised separately. CO content was more in rice husk pyrolysis gas product than lignite. Overall, there were heat exchange and interactions between husk and lignite during co-py-rolysis though the co-pyrolysis products were just the summation of pyrolysis separately.