温度对稻壳快速热解中挥发分转化的影响

Effect of Temperature on Volatiles Transformation During Fast Pyrolysis of Rice Husk

摘要

以稻壳为原料,借助恒温管式炉热解实验系统,研究了温度对热解产物分布及含氧化合物演化规律的影响．结果表明,温度显著影响热解产物的组成与含量,随着温度升高,液相产物产率由45.8%下降至33.1%,气相产率由13.6%升高至34.6%；温度是影响含氧组分赋存形态与含量的关键因素．低于600 ℃时,液相中主要生成苯酚、甲苯酚及糠醛、糠醇等酚类与呋喃类衍生物,含量占比为14.14%～62.92%；高于600 ℃后,酚类和呋喃类经脱羧、芳构化等反应逐渐向芳香族化合物转化．该研究明确了不同温度区间内典型含氧组分的生成及转化特征,为农林废弃物热转化过程中焦油中含氧化合物的调控与资源化利用提供了技术支撑．

Abstract

In this study,rice husk was selected as the feedstock,and pyrolysis experiments were conducted in a fixed-bed tubular furnace to systematically evaluate the influence of temperature on product distribution and the evolution of oxygenated compounds. With increasing temperature,the liquid yield decreased from 45.8% to 33.1%,whereas the gas yield rose from 13.6% to 34.6%. Temperature was identified as the dominant factor governing the generation and transformation of oxygenated species. At temperatures below 600 ℃,phenolic and furanic derivatives,such as phenol,cresol,furfural,and furfuryl alcohol,were the predominant liquid products,accounting for 14.14%—62.92%. At higher temperatures(＞600 ℃),these compounds were progressively converted into aromatic hydrocarbons through decarboxylation and aromatization. This study elucidates the temperature-dependent evolution of key oxygenated compounds and provides technical guidance for the regulation and valorization of tar during the thermal conversion of agricultural and forestry residues.

关键词

稻壳 / 热解 / 恒温管式炉 / 含氧化合物

Key words

rice husk / pyrolysis / constant temperature tube furnace / oxygenated compounds

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