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Study on the pyrolysis kinetics of HCI-pretreated soybean stalk

机译：HCI预处理大豆秸秆热解动力学研究

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摘要

To study the influences of the acid-washing on the characteristics of soybean stalk pyrolysis , and search the high-efficiency catalyst for biomass pyrolysis, pyrolysis experiments of soybean stalk pretreated by 0.1mol/L HC1 acid solution were performed by nonisothermal thermogravimetric analysis (TGA) at five different heating rates. The results showed the pyrolysis process of HCl-washed soybean stalk can be separated into four stages (water loss, depolymeri-zation artd vitrification, thermal decomposition, and carbonization). At the same heating rate, the maximum pyrolysis rate of HCl-washed is larger than untreated soybean stalk, but the corresponding temperature is higher. All the DTG (differential thermogravimetric) curveas appear a smaller shoulder peak respectively. With the heating rate increasing, the main pyrolysis zone of the TG (thermogravimetric) and DTG curves move to the high-temperature direction, and the maximum pyrolysis rate and its corresponding temperature increase too. HCl-wahsed makes the weight loss rate of the final temperature increase 5% approximately. The value area of activation energy of the main pyrolysis area is 140.19-174.59 kJ/mol calculated by the method of Ozawa. The Satava method inferred the most possible mechanism function of HCl-wahsed soybean stalk is Zhuralev-Lesakin-Tempelman equation, which is three-dimensional diffusion.
机译：为了研究对大豆秸秆热解的特性酸洗的影响，并搜索生物质热解，大豆秸秆由0.1mol / L的盐酸酸溶液预处理由非等温热重量分析进行的热解实验的高效率的催化剂（TGA ）在五个不同的加热速率。结果表明：盐酸洗涤大豆茎的热解过程可分成四个阶段（失水，depolymeri-矩阵特殊积ARTD玻璃化，热分解，和碳化）。以相同的加热速率，的盐酸洗涤热解最大速率是比未处理的大豆茎较大，但对应的温度较高。所有的DTG（差热重）curveas分别出现一个较小的肩峰。随着升温速率的增加，TG（热重）和DTG曲线的主热解区移动到高温方向，最大的热解率及其相应的温度升高太多。 HCl-二wahsed使得最终的温度增加5％约失重率。主热解区域的活化能的值区域是小泽的方法计算140.19-174.59千焦/摩尔。该方法Satava推断HCl-二wahsed大豆茎的最可能的机制的功能是Zhuralev-Lesakin-Tempelman方程，这是三维扩散。

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