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林产化学与工业 ›› 2019, Vol. 39 ›› Issue (5): 59-66.doi: 10.3969/j.issn.0253-2417.2019.05.008

• 研究报告 • 上一篇    下一篇

芒草热解焦的制备及其CO2气化反应动力学及机理分析

郭深, 田红, 胡章茂, 徐慧芳, 焦豪   

  1. 长沙理工大学 能源与动力工程学院, 湖南 长沙 410114
  • 收稿日期:2019-05-31 出版日期:2019-10-25 发布日期:2019-11-01
  • 通讯作者: 田红,副教授,硕士生导师,主要从事生物质热解及气化研究工作;E-mail:tianh1103@163.com E-mail:tianh1103@163.com
  • 作者简介:郭深(1996-),男,湖南常德人,硕士生,从事生物质热解及气化特性研究;E-mail:1045157738@qq.com
  • 基金资助:
    国家自然科学青年基金项目资助(51706022);湖南省自然科学青年基金项目(2018JJ3545);湖南省教育厅优秀青年项目(16B001)

Preparation of Miscanthus sinensis Pyrolytic Char and Analysis of Reaction Kinetics and Mechanism of Gasification Using CO2 as Gasifier

GUO Shen, TIAN Hong, HU Zhangmao, XU Huifang, JIAO Hao   

  1. School of Energy & Power Engineering, Changsha University of Science & Technology, Changsha 410114, China
  • Received:2019-05-31 Online:2019-10-25 Published:2019-11-01

摘要: 利用傅里叶红外光谱仪、扫描电镜和低温氮吸附法表征芒草热解焦的物化特性,采用非等温法和主曲线法结合研究芒草热解焦CO2气化反应机理。结果表明:随着制备温度的升高,芒草热解焦的有机质减少;热解过程有利于孔隙结构的形成,增大了热解焦比表面积和孔容,600℃时芒草热解焦(MPC600)的微孔率最大,为86.73%;随着制备温度和气化升温速率的升高,芒草热解焦气化反应的最大失重速率温度向高温侧偏移。采用Ozawa法对芒草热解焦气化动力学参数进行计算,制备温度为400、600和800℃的芒草热解焦平均活化能分别为171.87、181.20和184.45 kJ/mol;所有制备温度下获得的芒草热解焦的活化能与转化率无关,反应可用单一的动力学机理函数描述。主曲线法判定动力学模型机理函数结果表明:芒草热解焦气化动力学符合一维相边界反应(R1)机理。

关键词: 制备条件, CO2气化反应特性, 主曲线法

Abstract: The physicochemical properties of Miscanthus sinensis Andersson pyrolysis char was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy and low temperature nitrogen adsorption. The CO2 gasification reaction mechanism of M. sinensis pyrolysis char was studied by a non-isothermal thermogravimetry method along with Master-plot method. The results showed that the organics of pyrolysis char decreases with the increment of temperature. Pyrolysis process was beneficial to the formation of pore structure and improvement of the specific surface area and pore volume. The maximum microporisty of 600℃ pyrolysis char (MPC600) was 86.73%. With the increasing of pyrolysis char preparation temperature and gasification heating rate, the maximum conversion rate temperature of pyrolysis char gasification reaction were shifted to the high temperature side. The gasification kinetic parameters of pyrolysis chars were calculated by Ozawa method. The average activation energy of pyrolysis chars were 171.87, 181.20 and 184.45 kJ/mol at 400, 600 and 800℃, respectively. The activation energy was independent of the conversion rate and the reaction can be described by a single kinetic mechanism function. The Master-plot method was used to determine the mechanism function of the kinetic model. The gasification kinetics of pyrolysis char was consistent with the 1D phase boundary reaction (R1) mechanisms.

Key words: preparation condition, CO2 gasification reaction characteristics, Master-plot method

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