流化床藻类生物质快速热裂解试验

    Fast pyrolysis of algae biomass in by fluidized-bed

    • 摘要: 为实现藻类生物质资源的综合利用,该文选取藻类生物质中的马尾藻进行热重分析,并在自行设计的小型流化床上进行快速热裂解试验,分别研究了马尾藻热解过程及热解产物的产率随温度的变化规律。结果表明,随着温度的升高,热解经历了3个阶段:预热解、快速热解、慢速热解,并且由于多糖、蛋白质等物质热稳定性的不同引起马尾藻在快速热解阶段出现两个失重峰。在快速热裂解试验中,选择450、500、550、600℃ 4个反应温度对马尾藻的热裂解规律进行了研究,主要考察了不同反应温度对热裂解产物收集率的影响。研究发现残炭的产率随着温度的升高而降低,而热解气的产率则随着温度的升高而升高,生物油的产率随温度变化先升高后降低,在550℃左右时产率最高,约为30.5%,这为马尾藻快速热裂解制油的推广与工业利用提供参考。

       

      Abstract: To achieve comprehensive utilization algae biomass, pyrolysis process and fast pyrolysis experiment of sargassum, a kind of algae biomass, were performed in thermogravimetric analyzer and self-designed fluidized bed reactor, respectively. The thermogravimetric experiments results showed that pyrolysis process consisted of three stages: pre-pyrolysis, fast pyrolysis and slow pyrolysis. Because of the difference of thermal stability between polysaccharide and protein, two weight loss peaks were observed in the stage of fast pyrolysis. 450、500、550 and 600℃ were adopted in the fast pyrolysis experiments. The influence of reaction temperature on the collection rate of pyrolysis production was specially investigated. The results showed that char yield decreased steadily with rising of temperature, which was opposite to the gas product yield. The yield of bio-oil increased to a maximum value and then went down as temperature increased. The highest liquid yield of 30.5% was achieved at 500℃。

       

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