摘要
为获得可靠的煤焦-CO_2气化反应动力学参数,采用Flunm-Wall-Ozawa(FWO)等转化率法进行煤焦-CO_2气化动力学研究。在3个不同升温速率下进行了煤焦-CO_2气化热重试验,计算不同碳转化率下的反应活化能,用主曲线法分析了气化机理模型,并采用拟合法对等转化率法的结果进行验证。结果表明,气化主反应区不同碳转化率下(α为0.2~0.8)活化能的变化较小,为(228.25±5.22)k J/mol。煤焦-CO_2气化反应为均相模型,该模型标准曲线与试验曲线重合度较好,并符合目前常用的煤气化动力学模型。拟合法计算的活化能仅与等转化率法相差0.74 k J/mol,说明等转化率法研究煤焦-CO_2动力学可行。
In order to obtain the reliable kinetics parameters of char-CO_2 gasification,the kinetics were evaluated by Flunm-Wall-Ozawa（ FWO） iso-conversional method.A series of gasification experiments were carried out at three different heating rates of TG.The reaction activation energy were calculated under different carbon conversion ratio,the gasification mechanism was analyzed by using principal curve,and the data obtained from the iso-conversional method were examined by fitting method.Results show that the variation of the gasification activation energy present little change（（ 228.25 ±5.22） k J/mol） at different carbon conversion rate（ α ranges from 0. 2 to 0. 8）.This paper suggestes that char-CO_2 gasification process is homogeneous model,and the experimental curves are close to the model curve.The model is satisfying with the kinetics model commonly used in coal gasification.The difference of the gasification activation energy between fitting method and iso-conversional method is 0.74 k J/mol,therefore,the iso-conversional method is feasible for kinetics study of char-CO_2 gasification.
出处
《洁净煤技术》
CAS
2017年第3期33-38,共6页
Clean Coal Technology
基金
陕西省科技统筹创新工程计划资助项目(2015KTZDGY05-04-01)
关键词
等转化率法
煤焦
气化
动力学
热重
iso-conversional method
char
gasification
kinetics
thermogravimetric
