菜籽油酯交换制备植物绝缘油的热稳定性分析

Thermal Stability Analysis of Vegetable Insulating Oil Prepared by Transesterification of Rapeseed Oil

矿物绝缘油作为一种重要的液体绝缘介质,被广泛应用于油浸电力设备。但矿物绝缘油源于化石能源,伴随化石资源紧缺和环境问题恶化,开发新型绿色环保的液体绝缘介质已迫在眉睫。菜籽油脂作为绿色可再生的天然酯具有良好的绝缘性,但由于黏度较大,流动性不好,导致菜籽油散热性差。掺入菜籽油甲酯可以改善菜籽油流动性。为了研究菜籽油甲酯的热稳定性,利用热重分析技术研究菜籽油甲酯的热解过程,并通过Friedman⁃Reich⁃Levi热分析动力学计算方法计算了菜籽油甲酯热解动力参数。热解过程分为三个阶段,有小分子物质挥发、菜籽油甲酯热解、固定碳形成,计算得到活化能为30~47 kJ/mol,这表明菜籽油甲酯将可以作为辅助试剂添加到天然酯中用作绝缘油,为其工业应用提供理论基础和数据支持。

As an important liquid insulating medium,mineral insulating oil is widely used in oil immersed power equipment.However,mineral insulating oil is derived from fossil energy.With the shortage of fossil energy and the deterioration of environmental problems,the development of a new type of green and environmentally friendly liquid insulating medium is urgent.As a green and renewable natural ester,rapeseed oil shows good insulation,but shows poor heat dissipation due to its high viscosity and poor fluidity.The addition of rapeseed oil methyl ester could improve the fluidity of rapeseed oil.In order to study the thermal stability of rapeseed oil methyl ester,the pyrolysis process of rapeseed oil methyl ester was studied by thermogravimetric analysis,and the pyrolysis kinetic parameters of rapeseed oil methyl ester were calculated by Friedman Reich Levi thermal analysis kinetic calculation method.The pyrolysis process is divided into three stages:the volatilization of small molecules,the pyrolysis of rapeseed oil methyl ester,and the formation of fixed carbon.The activation energy is calculated to be 30~47 kJ/mol,which indicates that rapeseed oil methyl ester can be added as an auxiliary reagent to natural esters and used as insulating oil,providing theoretical basis and data support for its industrial application.