蒸汽爆破前后生物质秸秆的物理化学特性（英文）  

Characterizations of physico-chemical changes of corn biomass by steam explosion

作　　者：苏同福[1] 赵国忠[2] 任天宝[3] 徐翠莲[1] 宫长荣[3] 陈钢[1] 

机构地区：[1]河南农业大学化学系,郑州450003 [2]首都师范大学物理系,北京100037 [3]河南农业大学烟草系,郑州450003

出　　处：《农业工程学报》2015年第6期253-256,共4页Transactions of the Chinese Society of Agricultural Engineering

基　　金：Supported by 863 Program(2012AA022301B);Doctor Foundation HAU(3070 0368);State Tobacco Monopoly Administration P.R.China(Contract No.TS-01-2011006);Recommend International Advanced Agricultural Science and Technology Plan(No.2010-S25);Program for Innovative Research Team(in Science and Technology)in University of Henan province(15 IRTSTHNO014)

摘　　要：为深入了解汽爆过程对生物质秸秆的影响,采用扫描电镜和太赫兹时域光谱系统,对汽爆前后的秸秆分别做了检测,分别得到了它们的形貌特征、微区成分分布和太赫兹图谱。其形貌特征显示,秸秆薄壁细胞和表皮被汽爆过程所粉碎,秸秆物质的比表面积大大增加,致使增加了物料的接触面积,在制备沼气或生物质燃料过程中,使得其发酵速度增加。太赫兹时域图谱表明,薄壁细胞和表皮物质的吸收系数,随着频率的增加而增加。同时,由于汽爆因素的影响,它们的吸收系数在汽爆前后明显不同,表明其结构发生了一些变化,微区成分分析也证明了这一点。更为重要的是,薄壁细胞在汽爆前后,其吸收光谱分别检测出2个明显的吸收峰,且前后频率位移较大,但其结构变化的机制、变化与振动峰的关系和对振动峰的归属和指认需要做进一步的研究。Scanning electron microscopy（SEM） and terahertz time domain spectroscopy（THz-TDS） were employed to investigate the effects of steam-explosion on biomass, and the surface images, micro-analysis and terahertz spectra were obtained. SEM analysis of the surface showed that the parenchyma cell and epidermis of corn stem were smashed and separated by steam-explosion, which suggests a great increase in specific surface area and potentially enhanced speed of fermentation in the production of biogases and biofuels. Terahertz spectra of stover showed that their absorption coefficients increase with increasing frequency. Steam explosion may cause a subtle chemical change in biomass according to obviously different absorption coefficients between the steamed and original samples, which could also be proved by micro-analysis. Moreover, two resonance peaks were detected in the absorption curves of parenchyma cell, with notable frequency shift between curves of the steamed and original parenchyma cells. Assignments of the two vibrational peaks must be explored by further studies.

关 键 词：秸秆 物理性质 生物质 太赫兹光谱 汽爆 微区分析 

分 类 号：X705[环境科学与工程—环境工程]