废轮胎与生物质共热解特性研究

doi:10.3969/j.issn.0253-2417.2018.05.008

摘要/Abstract

摘要： 采用热重分析（TG-DTG）对废轮胎和生物质的热解特性进行了分析，研究了原料配比、升温速率及粒度对热解的影响，并采用HSC计算模拟软件对热解气体的分布规律进行了模拟。研究结果表明：废轮胎与生物质共热解过程主要分为干燥阶段（20～200℃）、气化裂解阶段（200～500℃）和二次裂解阶段（500～800℃）3个阶段。废轮胎掺混比例由100%下降至0时，热解初始温度由358.0℃下降至288.5℃，热解终止温度由473.0℃下降至361.6℃。随着升温速率和原料粒度的增加，废轮胎热解反应的最大失重速率增大，热解终温逐渐升高，反应向高温方向移动。采用Coats-Redfern法得到的废轮胎与生物质共热解阶段（250～500℃）活化能为18.61～40.86kJ/mol，生物质掺混比例增加时反应所需要的活化能减小。HSC计算模拟发现：热解过程气体产物主要为H₂、CO、CH₄和CO₂，随着废轮胎掺混比例下降，H₂、CO和CO₂产量增加，CH₄产量减小。通过可燃性气体总量与CO₂产量比值及热解特性分析发现：废轮胎掺混比例控制在40%～60%时获取的可燃性气体产量较高。

关键词: 生物质, 废轮胎, 热解动力学, 热重, 热解特性, HSC

Abstract: The co-pyrolysis process of waste tire and biomass at various blend ratios, heating rate and granular size were investigated using thermogravimetric analysis. HSC calculate simulation software was used to simulate the release rule of pyrolysis gas. The results showed that the co-pyrolysis process of waste tire and biomass was divided into three stages:drying stage (20-200℃), gasification and pyrolysis stage (200-500℃), secondary cracking stage (500-800℃). With the waste tire blend ratios decreasing from 100% to 0, the initial pyrolysis temperature decreased from 358.0℃ to 288.5℃, and the terminated pyrolysis temperature decreased from 473.0℃ to 361.6℃. With the increasing of heating rate and granular size, the maximum pyrolysis reaction rate and terminated pyrolysis temperature increased, the reaction moved toward to high temperature without influence on terminal reaction products. Pyrolysis kineties of the co-pyrolysis process was studied by Coats-Redfern method. The results showed that the activation energies of co-pyrolysis process (200-500℃) were between 18.61-40.86 kJ/mol, and decreased with the decreasing of waste tire blend ratio. HSC simulation showed that with the decreasing of waste tire blend ratios, content of H₂, CO, CO₂ increased, but CH₄ decreased. According to the ratio of amount of gas and pyrolysis properties, it was found that more combustible gas could be obtained at blend ratio of waste tire 40%-60%.

Key words: biomass, waste tire, pyrolysis kinetics, TG-DTG, pyrolysis behaviors, HSC

中图分类号:

TQ35

吴凯, 朱锦娇, 朱跃钊, 杨烨. 废轮胎与生物质共热解特性研究[J]. 林产化学与工业, 2018, 38(5): 53-60.

WU Kai, ZHU Jinjiao, ZHU Yuezhao, YANG Ye. Co-pyrolysis Process of Waste Tire and Biomass[J]. Chemistry and Industry of Forest Products, 2018, 38(5): 53-60.

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