医疗废物中输液管(含PVC)与纱布(含纤维素)的混合热解动力学模型

Co-Pyrolysis Kinetic Model of Tube for Transfusion(PVC) and Gauze(Cellulose) in Medical Wastes

为研究聚氯乙烯(polyvinyl chloride,PVC)类与生物质类医疗废物的混合热解特性,利用差热热重分析仪,在氮气气氛下,对输液管(tube for transfusion,TFT;含PVC)和纱布(含纤维素)样品进行了混合热解实验,并以其相互反应机制为依据,单组分热解模型为基础,建立了二者混合热解的动力学模型.结果表明:提出的输液管与纱布相互反应热解模型能很好地描述二者的热解行为,相对误差达1.03%;模型计算得到的动力学参数显示输液管脱除HCl的反应和纱布生成水和醛类物质的反应的活化能均明显降低,而其他反应的动力学参数仅出现轻微变化或无变化,验证了二者混合热解的相互催化机理和相互反应机制.

To obtain co-pyrolysis characteristics of medical wastes containing polyvinyl chloride （PVC） and biomass, co-pyrolysis experiment on mixture of tube for transfusion （TFT） and gauze, the main ingredient of which was PVC and cellulose respectively, was carried out in an atmosphere of N2 using thennogravimetric analyser （TGA）. In view of the co-pyrolysis behavior and mechanism, a co-pyrolysis kinetic model, which could reflect interaction principle between TFT and gauze, was established based on the pyrolysis model of single component. The calculated results and experimental data show satisfactory agreement with relative error of 1.03 %. Both the obtained kinetic parametes of activation energy for HCl evolution reaction from TFT and the aldehyde production reaction from the original cellulose evidently decreased, while the kinetic parameters for other reactions almost kept changeless. All results verify that the co-pyrolysis kinetic model can describe the interaction and catalysis mechanism for co-pyrolysis of TFT and gauze.