Municipal solid wastes from industrial plants were pyrolyzed in a fixed bed reactor to evaluate the influence of paper/plastic ratio and reaction time both on product quantity and quality. Raw materials have been pyro...Municipal solid wastes from industrial plants were pyrolyzed in a fixed bed reactor to evaluate the influence of paper/plastic ratio and reaction time both on product quantity and quality. Raw materials have been pyrolyzed under nitrogen in a 3.0 dm^3 autoclave. Results show considerable differences in yields and quality of products obtained by pyrolysis of wastes with different paper content. Light and heavy oils were mixtures of organic compounds containing valuable hydrocarbons and oxygenated chemicals, while chars were rather composed of inorganic compounds from the raw materials. Longer reaction time of pyrolysis had produced higher non-condensable gas, water and light oil. Gases contained CO, CO2 and hydrocarbons, but the concentrations were very function of reaction time and paper/plastic ratio. Light and heavy oils showed similarities with middle distillates and heavy oils in refinery, the high paper content of the raw materials was unfavourable for longer storage of waste derived oils.展开更多
回复电压法(recovery voltage method,RVM)是诊断油纸绝缘复合电介质绝缘状态的无损方法。采用回复电压测试装置对不同的初始微水质量分数和老化程度的油纸绝缘试样进行测量,得到回复电压曲线的各个特征参量值:回复电压最大值、初始斜...回复电压法(recovery voltage method,RVM)是诊断油纸绝缘复合电介质绝缘状态的无损方法。采用回复电压测试装置对不同的初始微水质量分数和老化程度的油纸绝缘试样进行测量,得到回复电压曲线的各个特征参量值:回复电压最大值、初始斜率和中心时间常数;为了更全面地反映油纸绝缘的老化状态,首次定义了一个新的参量:回复电压半衰期,即回复电压值在衰减到回复电压最大值一半的时刻。研究结果表明:在不同的充电电压和充放电时间比下,回复电压最大值、中心时间常数、初始斜率均与绝缘纸聚合度有良好的线性相关性。对于同一绝缘纸试样,回复电压最大值与充电电压以及充放电时间比均为正相关关系,充放电时间比对回复电压最大值的影响更显著;充放电时间比和充电电压对中心时间常数的影响不显著,中心时间常数不易受外部测试条件改变的影响,可较准确反映绝缘试样的老化状态;初始斜率随着充放电时间比的升高而增大,但受到充电电压的影响较小。回复电压半衰期随着充放电时间比的增大而升高,是反映回复电压曲线后期特性的良好特征参量,可反映油纸绝缘慢去极化过程。展开更多
文摘Municipal solid wastes from industrial plants were pyrolyzed in a fixed bed reactor to evaluate the influence of paper/plastic ratio and reaction time both on product quantity and quality. Raw materials have been pyrolyzed under nitrogen in a 3.0 dm^3 autoclave. Results show considerable differences in yields and quality of products obtained by pyrolysis of wastes with different paper content. Light and heavy oils were mixtures of organic compounds containing valuable hydrocarbons and oxygenated chemicals, while chars were rather composed of inorganic compounds from the raw materials. Longer reaction time of pyrolysis had produced higher non-condensable gas, water and light oil. Gases contained CO, CO2 and hydrocarbons, but the concentrations were very function of reaction time and paper/plastic ratio. Light and heavy oils showed similarities with middle distillates and heavy oils in refinery, the high paper content of the raw materials was unfavourable for longer storage of waste derived oils.
文摘回复电压法(recovery voltage method,RVM)是诊断油纸绝缘复合电介质绝缘状态的无损方法。采用回复电压测试装置对不同的初始微水质量分数和老化程度的油纸绝缘试样进行测量,得到回复电压曲线的各个特征参量值:回复电压最大值、初始斜率和中心时间常数;为了更全面地反映油纸绝缘的老化状态,首次定义了一个新的参量:回复电压半衰期,即回复电压值在衰减到回复电压最大值一半的时刻。研究结果表明:在不同的充电电压和充放电时间比下,回复电压最大值、中心时间常数、初始斜率均与绝缘纸聚合度有良好的线性相关性。对于同一绝缘纸试样,回复电压最大值与充电电压以及充放电时间比均为正相关关系,充放电时间比对回复电压最大值的影响更显著;充放电时间比和充电电压对中心时间常数的影响不显著,中心时间常数不易受外部测试条件改变的影响,可较准确反映绝缘试样的老化状态;初始斜率随着充放电时间比的升高而增大,但受到充电电压的影响较小。回复电压半衰期随着充放电时间比的增大而升高,是反映回复电压曲线后期特性的良好特征参量,可反映油纸绝缘慢去极化过程。
