高炉喷吹废塑料与兰炭混合燃烧及动力学
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摘要
为了明确废塑料对兰炭燃烧的影响,采用热重分析法研究了废塑料、兰炭混合物的燃烧行为,结合TG和DTG曲线变化,基于燃烧特性值分析,探讨了废塑料、兰炭混合物燃烧机理,并对混合物燃烧过程进行了动力学分析,计算了燃烧动力学参数。结果表明,废塑料和兰炭相比,具有较低的燃烧特征温度和较大的燃烧速率,配加废塑料可以增大兰炭的综合燃烧特性指数(S)和可燃性指数(C)。燃烧过程分为挥发分燃烧阶段、固定碳燃烧阶段2个部分。双重平行反应n阶速率模型较好地模拟了废塑料、兰炭混合物的燃烧过程,且第1阶段的活化能高于第2阶段。同时,随着废塑料质量分数的增加,2个阶段活化能E均呈现先减小后增加的趋势,而指前因子k变化规律相反,两者具有明显的动力学补偿效应。
In order to clarify the effect of waste plastics on the burning of anthracite, the combustion behavior of waste plastics and anthracite mixtures was investigated by thermogravimetric analysis. Combined with the change of TG and DTG curves, the combustion mechanism of waste plastics and anthracite mixture was discussed based on the analysis of combustion characteristic. The kinetics of the combustion process of the mixture was analyzed,and the combustion kinetic parameters were calculated. The results indicate that the waste plastics has a lower combustion characteristic temperature and a faster burning rate than the anthracite. Adding waste plastics can increase the comprehensive combustion characteristic index(S)and flammability index(C)of anthracite. The combustion process is divided into two stages:volatile combustion stage and fixed carbon combustion stage. The double-stage parallel reaction n-order rate model can better simulate the mixed combustion process of waste plastics and anthracite. With the increase of waste plastics mass percent, the activation energy in the first stage is higher than that in the second stage. The activation energy at both stages shows a trend of increasing first and then decreasing, while the trend of the pre-exponential factor k is opposite; both parameters have obvious dynamic compensation effects.
In order to clarify the effect of waste plastics on the burning of anthracite, the combustion behavior of waste plastics and anthracite mixtures was investigated by thermogravimetric analysis. Combined with the change of TG and DTG curves, the combustion mechanism of waste plastics and anthracite mixture was discussed based on the analysis of combustion characteristic. The kinetics of the combustion process of the mixture was analyzed,and the combustion kinetic parameters were calculated. The results indicate that the waste plastics has a lower combustion characteristic temperature and a faster burning rate than the anthracite. Adding waste plastics can increase the comprehensive combustion characteristic index(S)and flammability index(C)of anthracite. The combustion process is divided into two stages:volatile combustion stage and fixed carbon combustion stage. The double-stage parallel reaction n-order rate model can better simulate the mixed combustion process of waste plastics and anthracite. With the increase of waste plastics mass percent, the activation energy in the first stage is higher than that in the second stage. The activation energy at both stages shows a trend of increasing first and then decreasing, while the trend of the pre-exponential factor k is opposite; both parameters have obvious dynamic compensation effects.
引文
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[5] Qi G Y,Fang J Q,Gong C,et al.Thermogravimetric analysis of co-combustion of biomass and biochar[J].Journal of Thermal Analysis and Calorimetry,2013,112(3):1475.
[6] Zhang K.Co-combustion characteristics and blending optimization of tobacco stem and high-sulfur bituminous coal based on thermogravimetric and mass spectrometry analyses[J].Bioresource Technology,2013,131(3):325.
[7] 巴飞,胡建杭,刘慧利,等.全氧条件下生物质和塑料共燃烧的热重分析及动力学[J].过程工程学报,2016,16(6):1022.(Ba F,Hu J H,Liu H L,et al.Thermogravimetric analysis and kinetics of biomass and plastic co-combustion in oxygen enriched environment[J].The Chinese Journal of Process Engineering,2016,16(6):1022.)
[8] 闵凡飞,张明旭.生物质与不同变质程度煤混合燃烧特性的研究[J].中国矿业大学学报,2005,16(2):107.(Min F F,Zhang M X.Research on combustion characteristics of biomass and coals with different ranks[J].Journal of China University of Mining and Technology,2005,16(2):107.)
[9] 张锦萍,王长安,贾晓威,等.半焦-烟煤混燃特性及动力学分析[J].化工学报,2018,69(2):1.(Zhang J P,Wang C A,Jia X W,et al.Co-combustion characteristics and kinetic analysis of semi-coke and bituminous coal[J].CIESC Journal,2018,69(2):1.)
[10] Wang G W,Zhang J L,Shao J G,et al.Thermal behavior and kinetic analysis of co-combustion of waste biomass/low rank coal blends[J].Energy Conversion and Management,2016(124):414.
[11] Biney P O,Gyamerah M,Shen J C,et al.Kinetics of the pyrolysis of arundo,sawdust,corn stover and switch grass biomass by thermogravimetric analysis using a mui-stage model[J].Bioresource Technology,2015(179):113.
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[13] Wang G W,Zhang J L,Zhang G H,et al.Experimental and kinetic studies on co-gasification of petroleum coke and biomass char blends[J].Energy,2017(131):27.
[14] Wang G W,Zhang J L,Shao J G,et al.Experimental and modeling studies on CO2 gasification of biomass chars[J].Energy,2016(114):143.