作　　者： (赵洁霞）; (周臻）; (田红）; (孙俊）; (曾凤清）; (刘成）;

机构地区： 长沙理工大学能源与动力工程学院,长沙410114

出　　处： 《环境科学学报》 2017年第9期3505-3510,共6页

摘　　要： 用热重分析仪和傅里叶红外光谱联用(TG-FTIR)技术对稻秆、谷壳及其经过不同预处理的水洗样、硝酸洗样进行实验研究,分析了生物质内在碱金属对其热解过程的影响.对比原样、水洗样和硝酸洗样的热解TG曲线与产气组分发现:内在碱金属的存在对生物质热解具有较大的催化作用,促进了样品半纤维组分的热分解,明显降低了最大反应速率,使样品分解能够在较低温度段完成,提高了热解过程中焦的生成率,强化了去甲烷化反应,促使热解向羟基乙醛、酸类等低小分子液体产物的方向转化,增大了CO_2和CO的生成量. The raw rice straw and chaff with and without leaching by deionized water and hydrochloric acid were studied using thermogravimetric （TG） coupled with Fourier transform infrared spectrometry （FTIR） to investigate the catalytic effect of inherent alkali metals during biomass pyrolysis. The results indicate alkali metals have a strong catalytic effect in the course of biomass pyrolysis. Comparing pyrolysis characteristics and gas production in raw samples with leaching samples, it is found that alkali metals promote thermal decomposition reaction of half fiber constituent, reduce the maximum reaction rate significantly so as to make sample decomposition process at a lower temperature, increase the output of bio-ehar, and promote shifi-methanation reaction and production of CO and CO2.

关 键 词： 生物质 热解 碱金属 催化作用