林产化学与工业2017，Vol.37Issue(6)：35-42,8.DOI:10.3969/j.issn.0253-2417.2017.06.005
碱性木质素对玉米秸秆成型特性的影响
Effect of Alkali Lignin on Corn Stalk Pelleting Process
摘要
Abstract
In order to study the effect of alkali lignin on corn stalk pelleting process and the bonding mechanism, the influences of four parameters ( alkali lignin adding amount, temperature, moisture and pressure ) on three technical indicators ( relaxed density, radial compressive strength and specific energy consumption) were investigated. The compression molding experiment showed that when alkali lignin adding amount increased from 0 to 20%, the relaxed density of corn stalk pellets increased from 1005 kg/m3 to 1157 kg/m3 and the radial compressive strength increased from 1353 N to 1930 N. This results suggested that increasing of alkali lignin could promote the corn stalk pelleting process. The thermal transition temperatures of corn stalk and alkali lignin were also studied by differential scanning calorimetry ( DSC ) . The results showed that the glass transition temperatures of corn straw and alkali lignin were between 92. 5-103 ℃ and 61-137 ℃, respectively. In the thermal transition temperature range, 100 ℃ was the lowest specific energy consumption with suitable moisture content. The suitable temperature range for alkali lignin bonding was 100-130℃. The microstructure of pellets showed that alkali lignin occurred melting transition after melting temperature and then formed'molten combination' and'mechanical interlocking' inside the particles. The suitable alkali lignin adding amount for bonding was 10% -15%.关键词
压缩成型/碱性木质素/黏结机理/比能耗/热转变温度/微观形态Key words
pelleting/alkali lignin/bonding mechanism/specific energy consumption/thermal transition/microstructure分类
化学化工引用本文复制引用
李伟振,姜洋,饶曙,阴秀丽,蒋恩臣..碱性木质素对玉米秸秆成型特性的影响[J].林产化学与工业,2017,37(6):35-42,8.基金项目
国家自然科学基金资助项目(51661145022) （51661145022）
广东省科技计划项目(2017A010104009) （2017A010104009）
广州市科技计划项目(201704020189) （201704020189）
