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Bio-syngas production from biomass catalytic gasification

机译：生物质催化气化生产生物合成气

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A promising application for biomass is liquid fuel synthesis, such as methanol or dimethyl ether (DME). Previous studies have studied syngas production from biomass-derived char, oil and gas. This study intends to explore the technology of syngas production from direct biomass gasification, which may be more economically viable. The ratio of H_2/CO is an important factor that affects the performance of this process. In this study, the characteristics of biomass gasification gas, such as H_2/CO and tar yield, as well as its potential for liquid fuel synthesis is explored. A fluidized bed gasifier and a downstream fixed bed are employed as the reactors. Two kinds of catalysts: dolomite and nickel based catalyst are applied, and they are used in the fluidized bed and fixed bed, respectively. The gasifying agent used is an air-steam mixture. The main variables studied are temperature and weight hourly space velocity in the fixed bed reactor. Over the ranges of operating conditions examined, the maximum H_2 content reaches 52.47 vol%, while the ratio of H_2/CO varies between 1.87 and 4.45. The results indicate that an appropriate temperature (750℃ for the current study) and more catalyst are favorable for getting a higher H_2/CO ratio. Using a simple first order kinetic model for the overall tar removal reaction, the apparent activation energies and pre-exponential factors are obtained for nickel based catalysts. The results indicate that biomass gasification gas has great potential for liquid fuel synthesis after further processing.
机译：生物质的有希望的应用是液体燃料合成，例如甲醇或二甲醚（DME）。先前的研究已经研究了由生物质衍生的焦炭，石油和天然气生产合成气的方法。这项研究旨在探索直接生物质气化生产合成气的技术，这种技术可能在经济上更可行。 H_2 / CO的比例是影响该过程性能的重要因素。在这项研究中，探索了生物质气化气的特性，例如H_2 / CO和焦油产率，以及其在液体燃料合成中的潜力。流化床气化炉和下游固定床用作反应器。使用两种催化剂：白云石催化剂和镍基催化剂，它们分别用于流化床和固定床中。所使用的气化剂是空气-蒸汽混合物。研究的主要变量是固定床反应器中的温度和重量时空速度。在检查的操作条件范围内，最大H_2含量达到52.47 vol％，而H_2 / CO的比率在1.87和4.45之间变化。结果表明，合适的温度（目前的研究温度为750℃）和更多的催化剂有利于获得更高的H_2 / CO比。使用用于整体焦油去除反应的简单的一阶动力学模型，可获得镍基催化剂的表观活化能和指数前因子。结果表明，生物质气化气经进一步处理后具有很大的合成液体燃料的潜力。

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