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本文基于多重扫描法对棉秆热解行为及机理进行了研究。结果表明,棉秆热解在30~600℃热解区间,分为四个区域,分别为失水、解聚"玻璃化转变"、主热解及炭化阶段,主反应区热重曲线和微分热重曲线都向高温方向移动。对主热解阶段采用Flynn-Wall-Ozawa(FWO)和Friedman-Reich-Levi(FRL)动力学模型对活化能E进行求解,在转化率10%到70%的范围内,棉杆的主热解阶段活化能十分稳定,两种方法的求解结果非常接近,而且线性拟合度很高。对实验数据进行非线性拟合,确定棉杆热解机理满足Avrami-Erofeev方程反应级数为0.4,机理函数形式为,G(α)=[-ln(1-α)]2/3,f(α)=5/2(1-α)[-ln(1-α)]3/5。
Abstract：Cotton stalk pyrolysis behavior and mechanism were studied based on the multi-scanning method. The results showed that cotton stalk pyrolysis zone during 30 ~ 600 ℃ could be divided into four regions,namely,water loss,depolymerization " glass transition",,main pyrolysis and charring stage. During the main reaction zone TG curves and differential TG curves were moving to high temperature. The activation energy E of the main stage of pyrolysis was solved by FWO and FRL method respectively. The results showed that the activation energy E was very stable in the conversion rate of 10% to 70%. The results of the two solving methods were very close and had a high degree of linear fitting. Experimental data were analyzed by the non-linear fitting,,and the mechanism of cotton stalk pyrolysis met Avrami-Erofeev equation. The reaction value of series(grade) was 0. 4. The function mechanism forms are G(α) = [-ln(1-α) ]2/3 and f(α) =5/2(1-α) [-ln(1-α) ]3/5 respectively.
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基本信息:
中图分类号:TQ914.3
引用信息:
[1]周岭,王明峰,蒋恩臣,等.基于多重扫描法对棉秆热解动力学的研究[J].塔里木大学学报,2015,27(01):81-85.
基金信息:
国家自然科学基金项目(51266014);; 新疆生产建设兵团博士基金项目(2008GG27)
2015-03-15
2015-03-15