矿物质添加剂对玉米秸秆粉末催化热解特性的影响  

Effects of mineral additives on catalytic pyrolysis characteristics of corn stalk powder

作　　者：庞赟佶[1,2] 李腾飞 陈义胜[1] 许嘉[1] 卢春晓 沈胜强[2] Pang Yunji;Li Tengfei;Chen Yisheng;Xu Jia;Lu Chunxiao;Shen Shengqiang(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Energy and Power Engineering,Dalian University of Technology,Dalian 116023,China)

机构地区：[1]内蒙古科技大学能源与环境学院,包头014010 [2]大连理工大学能源与动力学院,大连116023

出　　处：《农业工程学报》2018年第14期221-226,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(21466029);内蒙古自然基金(2015MS0106)

摘　　要：依托自制生物质管式炉热解试验平台,以高速机械掺混的方式将添加剂与玉米秸秆粉末直接混合,在常速热解条件下探究不同添加剂(Na_2CO_3、CaO、Fe_2O_3)对玉米秸秆粉末的原位催化热解影响,分析计算试验数据得出:在玉米秸秆粉末热解过程中,3种添加剂均能不同程度降低液相产物产率,提高热解气中氢气产率,其中Na_2CO_3对液相产物的降低效果是CaO的1.5倍,Fe_2O_3的20倍,Na_2CO_3主要是催化促进热解气的产生,CaO则是促进焦炭的生成,并且二者的热解焦炭均有不同形式的结焦聚团,且CaO作用下的热解气低位热值较高,而Fe_2O_3对液相产物的降低效果较小;通过研究3种添加剂对玉米秸秆粉末的热解影响,为生物质催化热解中催化剂的选择和工矿企业废物利用提供了有价值的数据理论和方向。Based on self-made biological tube furnace pyrolysis experiment platform, using 20 pyrolysis purpose corn stalk powder as raw materials and selecting Na2CO3, CaO, Fe2O3 as additives. Then, the additive was mixed with maize straw powder in 10% proportion by high speed rotating in situ blending method. At the same time, respectively to set the heating rate and final pyrolysis temperature as 40 ℃/min and 750 ℃, Pyrolytic raw material mixture to place inside the self-made pyrolysis reactor, reactor by means of frosted sealing（sealing way of sealing has verified）, before the reactor sealed by high purity nitrogen gas bubbled into the inside of the reactor, the pyrolysis reactor residual air exchange, to ensure that the reactor of the pyrolysis is without oxygen or lean oxygen environment. In this condition, to study the effects of different additives on the in-situ catalytic pyrolysis of corn stalk powder. By analyzing the corn stalk powder production rate under the effect of different additives of pyrolysis products change curve, at the same time, to research and analysis the composition of pyrolysis gas, microstructure of coke and its element distribution form and the change in functional groups in pyrolytic liquid phase products through gas chromatograph, scanning electron microscope, energy spectrometer and Fourier infrared spectrum analyzer and other instruments and equipment. Finally, X-ray diffraction was used to detect the existence forms of various additives in coke after pyrolysis, then, according to the results of testing and combining with the yield of pyrolysis products and product changes, speculate that the additives in the process of pyrolysis. The following conclusions are drawn： Adding Na2 CO3 and CaO of corn stalk powder in the pyrolysis process of the liquid yield is far lower than no additives, and the liquid yield reach the maximum at 650 ℃, is 36.39% and 37.88% respectively. Na2CO3 and CaO as the additives in the process of biomass pyrolysis of biomass tar have obvious inhibitory eff

关 键 词：热解 生物质 催化剂 玉米秸秆粉末 结焦聚团 

分 类 号：X705[环境科学与工程—环境工程]