摘要
文章进行了生物质中木质素的水热转化研究,采用响应面法研究了温度、反应时间和水固质量比等反应条件对生物油产量的影响。研究结果显示,木质素转化为生物油和生物油脱水缩合生成焦炭的两步竞争反应决定了最终的产油率。提高温度可以增加活化分子的数量,促进水解反应朝正向进行。然而,过高的温度(>340℃)和较长的反应时间(>35 min)会加剧油相产物脱水和自由基缩合反应,导致生物油产率下降。生物油生产存在一个最佳的水固比,适宜的水量可以在提供足够溶解度的同时,不过度稀释中间产物,为油相产物的生成创造有利条件。RSM模型的方差分析结果表明,模型与实验结果符合性良好。通过模型预测和实验验证显示,当木质素在335.6℃保持32 min,水与木质素质量比为10.2∶1时,生物油产率最大,可达到20%。
In the context of the carbon peak and carbon neutrality“3060 target”,biomass energy has broad prospects for utilization.As one of the most abundant components in biomass,research on hydrothermal liquefaction of lignin has been carried out.We proposed the response surface method(response surface methodology,RSM)to study the effect of reaction conditions(temperature,reaction time,and water-to-solid mass ratio)on the yield of bio-oil.The RSM model in this study can accurately predict the experimental data.When the lignin was kept at335.6℃for 32 minutes and the water/lignin mass ratio is 10.2∶1,the bio-oil is up to close to 20%.As the temperature increased from 300℃to 400℃and the reaction time from 0 to 60 min,the yield of bio-oil showed a tendency to increase first and then decrease.High temperature(>340℃)and long holding time(>35 min)would cause the bio-oil to undergo overheating dehydration and condensation to form coke,which leads to a decrease in oil yield.Insufficient or excess water was detrimental to the production of bio-oil.The results of the analysis of variance showed that the model was significant and fits well with the experimental results.
作者
陈荣杰
王龙洲
李清海
周会
张衍国
Chen Rongjie;Wang Longzhou;Li Qinghai;Zhou Hui;Zhang Yanguo(Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)
出处
《可再生能源》
CAS
CSCD
北大核心
2023年第3期285-290,共6页
Renewable Energy Resources
基金
国家自然科学基金项目(52070116)。
关键词
水热液化
木质素
响应曲面法
最优化
hydrothermal liquefaction
lignin
response surface methodology
optimization
