Operating condition optimization of corncob hydrothermal conversion for bio-oil production
Operating condition optimization of corncob hydrothermal conversion for bio-oil production
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DOI：
10.1016/j.apenergy.2012.09.053
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发表时间：
2013-03
期刊：
影响因子：
11.2
通讯作者：
Jing Gan;W. Yuan
中科院分区：
文献类型：
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作者：
Jing Gan;W. Yuan
采用响应面法（RSM）研究了反应温度、停留时间、生物质含量和催化剂负载量对玉米芯水热转化生物油产率、碳含量和碳回收率的影响。四个变量的范围为温度280 - 340°C，停留时间12- 48分钟，生物质固体含量9-21%，催化剂负载量0.76-2.25%。响应面模型表明，在实验范围内，生物质固含量高、碱性催化剂负载量适中、反应温度较低、停留时间较短的条件下，生物油收率和碳回收率较高。在280°C、12 min、21%的生物质固体含量和1.03-1.56%的催化剂负载量下，获得了最大的生物油产率41.3%和最大的碳回收率47.1%。在响应面模型中，生物油碳含量仅受反应温度和生物质固含量的影响。较高的温度和较低的生物质固体含量是有利的。在340°C和9%的生物质固体含量下实现了74.8%的最高生物油碳含量。预测的生物油产率、碳含量和碳回收率与验证实验结果吻合较好，表明响应面模型在设计和优化玉米芯水热转化过程中具有较好的准确性。
The effect of reaction temperature, retention time, biomass content, and catalyst loading on bio-oil yield, carbon content, and carbon recovery of corncob hydrothermal conversion was investigated and optimized via response surface methodology (RSM). The four variables ranged from 280 to 340°C for temperature, 12–48min for retention time, 9–21% for biomass solid content, and 0.76–2.25% for catalyst loading. It was found from RSM modeling that higher bio-oil yield and higher carbon recovery could be achieved at relatively low temperatures and short retention times with high biomass solid contents and moderate alkaline catalyst loadings in the test ranges. A maximum bio-oil yield of 41.3% and maximum carbon recovery of 47.1% were obtained at 280°C, 12min, and 21% biomass solid content with 1.03–1.56% catalyst loading. Bio-oil carbon content was found affected only by the reaction temperature and biomass solid content in the RSM model. Higher temperature and lower biomass solid content were favored. The highest bio-oil carbon content of 74.8% was achieved at 340°C with 9% biomass solid content. The predicted bio-oil yield, carbon content and carbon recovery were in close agreement with validation experiment results, indicating that the RSM models were accurate in designing and optimizing the hydrothermal conversion of corncobs.