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过程工程学报 ›› 2017, Vol. 17 ›› Issue (5): 1102-1108.DOI: 10.12034/j.issn.1009-606X.217128

• 环境与能源 • 上一篇    

木屑颗粒热解过程动力学计算及热解气体分析

袁聪聪1,2,3,4,王宇栋1,2,3,4*, 张丁川1,2,3,4,杨 斌1,2,3,4, 戴永年1,2,3,4     

  1. 1. 真空冶金国家工程实验室,云南 昆明 650093;2. 省部共建复杂有色金属资源清洁利用国家重点实验室,云南 昆明 650093; 3. 云南省有色金属真空冶金重点实验室,云南 昆明 650093;4. 昆明理工大学冶金与能源工程学院,云南 昆明 650093
  • 收稿日期:2017-02-06 修回日期:2017-03-09 出版日期:2017-10-20 发布日期:2017-10-10
  • 通讯作者: 王宇栋
  • 基金资助:
    云南省院士自由探索基金

Pyrolysis Dynamics Calculation and Pyrolysis Gases Analysis of Wood Particles

Congcong YUAN1,2,3,4,  Yudong WANG1,2,3,4*,  Dingchuan ZHANG1,2,3,4,  Bin YANG1,2,3,4,  Yongnian DAI1,2,3,4     

  1. 1. National Engineering Laboratory for Vacuum Metallurgy, Kunming, Yunnan 650093, China; 2. State Key Laboratory of Complex Non-ferrous Metal Resources Clear Utilization, Kunming, Yunan 650093, China; 3. Key Laboratory of Vacuum Metallurgy for Nonferrous Metal of Yunnan Province, Kunming, Yunnan 650093, China; 4. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunan 650093, China
  • Received:2017-02-06 Revised:2017-03-09 Online:2017-10-20 Published:2017-10-10

摘要: 以CO2和干空气为动态气氛,在10, 20, 30℃/min三种升温速率下进行热重实验,研究了气氛对压缩木屑颗粒热解反应的影响,用Netzsch Thermokinetics 3软件确定了失重曲线第2失重阶段的反应级数,用Coats?Redfern积分法计算了第2失重阶段的动力学参数,用气相色谱分析了放大实验在升温速率10℃/min下产生的热解气体成分. 结果表明,在CO2和干空气气氛下,随温度升高,木屑颗粒均出现3个失重阶段,第2阶段的失重分别为65.97%和56.31%,热解反应级数分别为1.2和1.0,活化能分别为117.73和87.4 kJ/mol,指前因子分别为5.8?106和1.1?104 min?1. 与空气气氛相比,CO2气氛下裂解气中CH4产量相对较低,而H2和CO产量较高.

关键词: 木屑颗粒, 二氧化碳, 热分析动力学, Coats-Redfern, 表观活化能

Abstract: To explore the effect of atmosphere on the pyrolysis reaction of compressed wood chips particles, the thermo-gravimetric experiments with carbon dioxide and dry air as the dynamic gases under heating rates of 10, 20, 30℃/min were conducted by using synchronous thermal analyzer. Aiming at the second mass loss stage of thermo-gravimetric curves, the software of Netzsch Thermokinetics 3 was used to analyze the reaction orders, and Coats?Redfern method was used to calculate the kinetic parameters. Moreover, gas chromatography was applied to determine the composition of pyrolysis gases produced from enlarged experiment of thermo-gravimetric experiment at the heating rate of 10℃/min. The results showed that there are 3 weightless stages in the heating process of wood particle under these two kinds of atmosphere. In carbon dioxide and dry air, the second stage weight loss were 65.97% and 56.31%, the thermal decomposition reaction series were 1.23 and 1.0, the activation energies of this pyrolysis phase were117.73 and 87.4 kJ/mol, and the pre-exponential factor were 5.8×106 and 1.1×104 min?1, respectively. In the pyrolysis gases, the concentration of methane is lower in carbon dioxide than in dry air, while hydrogen and carbon monoxide are higher.

Key words: wood particles, CO2, thermal analysis kinetics, Coats-Redfern, apparent activation energy