混合垃圾在热重分析仪和流化床中的燃烧特性

针对我国目前垃圾焚烧以烧原生垃圾为主的特点,以热重分析和流化床燃烧实验台为主要研究手段,对于混合垃圾的燃烧特性展开深入研究并将二者的试验数据进行对比.实验结果表明:不同的垃圾在流化床中的燃烧速率的数值比较接近.而不同的垃圾在热重仪中的燃烧速率差别很大,针对所选的试样其燃烧速率的变化范围是0.49～5.50.另外,在热重分析中,试样完全燃烬的时间一般为20～25min,而在流化床燃烧实验台中,试样的燃烧过程发展得非常快,燃烬时间非常短,仅需3～3.5min.混合垃圾在热重分析仪中的燃烧特性可以用单组分物质的叠加来表示,而混合的垃圾在流化床中燃烧时,用简单的单组分叠加来表示不很合理.

Combustion Characteristics of Mixed Municipal Solid Waste in Thermogravimetric Analysis and Lab Scale Fluidized Bed

In this paper, thermogravimetric analysis (TGA) and a lab scale fluidized bed facility were used as experimental means. The data in the two different experimental systems were introduced and compared. Experimental results show that the differences of combustion velocity among different wastes in Fluidized Bed(FB) were very small whereas in thermogravimetric analyzer the differences can not be ignored as the value range of combustion velocity variation was between 0.49 and 5.5. It took municipal solid waste 3-3.5 min to burn out in FB, but in thermogravimetric analyzer, the time was 20-25 min. It can be concluded that, in general, the behavior of a mixture of waste in TGA can be expressed by simple combination of individual components of the waste mixtures. Only minor deviations from the rule were observed. In FB, it was found that, for some mixtures, there was interference among the components during FB combustion.