摘要
以木聚糖为模型物，考察温度、微波功率以及微波吸收剂等因素对热解产物分布组成的影响规律。研究发现：中等温度（400-500℃）有利于生物油的生成，而更高的温度导致气体产量的增加；升高功率在较低温度（300～400℃）下有利于生物油和生物气的生成，而超过500℃后功率的影响明显减弱；生物焦收率随温度和功率总体呈下降趋势，但在温度超过500℃后趋于平稳，维持在20％左右；生物焦的加入增加了气体的生成，降低了生物油和生物焦的产出，石英砂对产物的影响不大，乙酸增加了生物质气体和生物油的产率。同时发现，生物油富含呋喃类、烃类以及糖类等裂解产物，通过推测主要产物的变化行为和转化途径，认为微波提供的富氢环境以及脱水效应导致了大量的呋喃类及糖类产物生成，而微波特有的“体加热”也强化单体开环、重整和缩聚形成芳烃。
In this study, hemicellulose was investigated to the effect of microwave-assisted pyrolysis temperatures, powers, microwave absorbents on distribution and composition of product. The study found that moderate temperature （400-500 ℃） is beneficial to the production of bio-oil and the higher temperature lead to the increase of gas production. Higher power at low temperature （300-400 ℃ ） is beneficial to bio-oil and gas generation and the influence of power after more than 500 ℃decreased significantly. The bio-char is on the decline in general, but leveled off after the temperature over 500 ℃, remain at around 20%. At the same condition, bio-gas yield increased after adding bio-ehar, reduced the output of bio-oil and bio-coke, quartz sand has little effect on the product, acetic acid increased the yield of bio-gas and bio-oil. We also found that furan, hydrocarbons and sugar are the main pyrolysis products in biological oil and predicted changing behavior and transformation path of these, then came to a conclusion that microwave provide rich hydrogen environment and dehydration effect led to a lot of furan and sugar products generated, and microwave characteristic of the ＂body heat＂ also strengthen monomer open loop, reforming and condensed to form aromatic hydrocarbons.
出处
《可再生能源》
CAS
北大核心
2015年第11期1749-1754,共6页
Renewable Energy Resources
基金
国家"863"项目(2015AA020201)
中国石油化工集团公司项目(SH1314)
关键词
半纤维素
微波
热解
转化途径
hemicellulose
microwave
pyrolysis
transform ways
