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生物质化学工程 ›› 2023, Vol. 57 ›› Issue (3): 49-55.doi: 10.3969/j.issn.1673-5854.2023.03.007

• 研究报告 • 上一篇    下一篇

水蒸气气氛下牦牛粪动力学特性研究

倪子昂, 符祝富(), 薛渊   

  1. 上海交通大学 中英国际低碳学院, 上海 201306
  • 收稿日期:2022-04-25 出版日期:2023-05-30 发布日期:2023-05-31
  • 通讯作者: 符祝富 E-mail:fuzhufu21@sjtu.edu.cn
  • 作者简介:符祝富, 博士生, 研究领域: 生物质能源利用, 二氧化碳转化; E-mail: fuzhufu21@sjtu.edu.cn
    倪子昂(1995—), 男, 上海人, 硕士生, 主要从事生物质能源高值化利用工作

Kinetic Characteristics of Yak Dung Under Steam Atmosphere

Zi'ang NI, Zhufu FU(), Yuan XUE   

  1. China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
  • Received:2022-04-25 Online:2023-05-30 Published:2023-05-31
  • Contact: Zhufu FU E-mail:fuzhufu21@sjtu.edu.cn

摘要:

采用热重分析法对水蒸气气氛下牦牛粪热失重特性进行了研究, 并运用Flynn-Wall-Ozawa法、主曲线法/Kissinger法和分布活化能模型(DAEM)连续耦合的方法对热解过程进行反应机理分析以及动力学参数计算。研究结果表明: 牦牛粪水蒸气气化过程主要分为两个阶段, 即热解阶段和气固反应阶段; 水蒸气对前者有轻微的抑制作用, 对后者有显著的促进作用。动力学分析表明, 反应级数机理模型(热解阶段和气固反应阶段反应级数分别为2.40和1.17)对牦牛粪水蒸气气化动力学过程有较好适应性; 热解阶段的半纤维素、纤维素和木质素热解对应的活化能分别为169.32、185.76和219.52 kJ/mol; 气固反应阶段的热解炭缩合反应和水蒸气气固反应对应的活化能分别为275.59和312.44 kJ/mol。

关键词: 畜禽粪便, 水蒸气气化, 热重分析, 动力学

Abstract:

The thermal weight loss characteristics of yak dung under water vapor atmosphere was investigated via the thermogravimetric analysis. The Flynn-Wall-Ozawa method, master plot method/Kissinger method and continuous coupling method of distributed activation energy model(DAEM) were used to analyze the reaction mechanism and calculate kinetic parameters of the pyrolysis process. The results showed that yak dung steam gasification process was mainly divided into two stages, namely the pyrolysis reaction stage and the gas-solid reaction stage. The steam could slightly inhibit the pyrolysis reaction and significantly promote the gas-solid reaction. The kinetic analysis demonstrated that the reaction order mechanism model(the reaction-orders of the pyrolysis stage and the gas-solid reaction stage were 2.40 and 1.17, respectively) had good adaptability to the kinetic process of yak dung steam gasification. The activation energies of the hemicellulose, cellulose and lignin in pyrolysis stage were 169.32, 185.76 and 219.52 kJ/mol, respectively. The activation energies of the pyrolysis carbon condensation reaction and the steam gas-solid reaction in the gas-solid reaction stage were 275.59 and 312.44 kJ/mol, respectively.

Key words: livestock manure, steam gasification, thermogravimetric analysis, kinetic

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