农业生物质秸秆低温热解预处理技术

农作物秸秆类生物质水分含量高、能量密度低、资源分散,因此储存运输成本高,而且可磨性差不易制粉用于煤粉锅炉或气化炉的混合燃烧与气化。生物质低温预处理技术是一种能够解决上述问题的温和热解方法,它能够显著改善生物质的特性。选取棉花秆和小麦秆在固定床实验台上N2氛围下分别升温至200℃、250℃、300℃热解,加热时间均为30 m in。制得的生物质半焦能量密度显著提高,对比原始的生物质其可磨性得到明显改善,并且具有了疏水性,便于储存运输或制粉用于气流床气化。最后根据实验结果进行预处理技术的可行性分析,推荐预处理条件为250℃、30 m in。

The Technology of Pretreament Biomass Via Torrefaction

Agricultural biomass have some drawbacks such as high moisture content, low energy density and widely distributed, as a result the cost of transport and store are high. Moreover, the raw biomass is poor grindability so that it is difficult to be used in pulverized boiler or entrained flow gasifier. Torrefaction is a mild pyrolysis process carried out at temperature ranging from 200℃ to 300 ℃ to dealing with those problems. Two samples, cotton stalk and wheat stalk, were heated in a fix -bed at moderate temperature （200℃ ,250 ℃ and 300 ℃ ） under a N2 atmosphere for 30 minutes. The biomass chars after being torrified have a higher energy density and improvement in the grindability characteristics compared with raw biomass and even has hydrophobic characteristics. Finally feasibility analysis was conducted according to the experimental results, if recommended pretreatment conditions for 250℃ ,30 min.