摘要
在氮气气氛中,利用热重分析对煤与杜氏盐藻及其混合物的热解特性进行了研究,考察了煤与杜氏盐藻不同掺混比例对热解过程的影响,并研究了共热解动力学.结果表明,煤与杜氏盐藻共热解特性并不是两者单独热解特性的简单叠加,在200～500,℃范围内两者之间存在明显的协同效应,其相对值高达28%.煤和杜氏盐藻单独热解均可分3个阶段,由于固定碳和灰分含量高,煤在相同热解阶段的失重率较杜氏盐藻低.动力学分析结果表明,以峰值温度为分界点,采用2个连续一级反应模型与实验数据拟合效果良好,计算得到共热解过程中的活化能和指前因子分别为16.06～28.20,kJ/mol和0.42～16.82,min-1;活化能与指前因子的对数之间具有良好线性关系.
The pyrolysis of coal, Dunaliella tertiolecta （D.tertiolecta）, and their mixture was carried out by ther-mogravimetric analysis （TGA） in nitrogen atmosphere, and the co-pyrolysis behavior and kinetics of coal-D. tertiolecta mixtures with different ratios were investigated. The experimental results show that the co-pyrolysis char-acteristics of coal-D.tertiolecta blends cannot be estimated as the weighted average sum of the pure feedstock. Syner-gistic effect exists between coal and D.tertiolecta within the temperature range from 200 ℃ to 500 ℃ during co-pyrolysis, and the relative value of synergy is up to 28%. The pyrolysis of coal and D.tertiolecta can be divided into three stages; because of the high content of fixed carbon and ash, the weight loss rate of coal is lower than that of D.tertiolecta at the same thermal stage. Kinetic analysis indicates that two first-order reaction models can fit well the experimental data when peak temperatures are used as the cut-off points. The activation energies （Ea）and frequency factors（A） in the process of co-pyrolysis are within the ranges of 16.06-28.20 kJ/mol and 0.42-16.82 min^-1, respectively. The linear relationship between In A and Ea has also been found.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2013年第3期281-286,共6页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(21176142)
中国石油科技创新基金资助项目(2010D50060406)
清华大学自主科研计划资助项目(2011Z08141)
关键词
煤
杜氏盐藻
共热解
动力学
协同作用
coal
Dunaliella tertiolecta
co-pyrolysis
kinetics
synergistic effect
作者简介
杨瑞丽（1987-），女，硕士研究生，yang_ruili@163．com．
通讯作者：吴玉龙，wylong@tsinghua．edu．cn．
