含金属元素化合物和压力对工业污泥燃烧特性的影响

为了更好地利用工业污泥,有必要对它的燃烧特性进行研究,因而利用热重法研究了由3种典型的工业污泥按质量比1∶1∶1混合后的多组分试样在掺混含不同金属元素混合物、不同升温速率以及加压下的燃烧特性.实验结果表明,含金属元素化合物对污泥的燃烧能起到一定的催化作用,有助于改善工业污泥的着火性能,提高工业污泥的燃烧放热量和燃尽水平.含不同金属元素化合物对于污泥燃烧的催化机制和作用有所差异.实验中各种含金属元素化合物促进污泥燃烧过程的作用次序由大到小依次为:K2CO3、NaCl、Al2O3.随着压力的增大,污泥试样燃烧反应区间向低温区移动,各特征温度均呈下降趋势,综合燃烧特性指数有所提高;而随着升温速率的增大,污泥试样燃烧反应区间向高温区移动,各特征温度均有所增大,但综合燃烧特性愈好,对污泥燃烧越有利.

Effects of compounds with metal element and pressure on the combustion characteristics of mixed industrial sludge

It is necessary to study the combustion process of industrial sludge in order to utilize it efficiently as a energy source.Using thermogravimetric analysis,the combustion characteristics of 3 types of mixed industrial sludge were determined.The effects of adding different inorganic compounds at a mass ratio 1:1:1K₂CO₃:NaCl:Al₂O₃],heating rate and pressure were measured.Results indicate that the compounds with metal element have some catalytic effects on the combustion of industrial sludge.The compounds with metals element can improve the ignition performance and burnout characteristics,and enhance its heat release capacity.The catalytic effects and mechanism of different compounds are described.The relative activity of tested catalysts towards enhancing the combustion of industrial sludge is:K₂CO₃>NaCl>Al₂O₃.In addition,with increasing the pressure,TG curves of industrial sludge move to the lower temperature zone,lowering the ignition and burnout temperature,and greatly improving its general combustion performance.With increased heating rate,the TG curves of industrial sludge move to the higher temperature zone and have higher ignition and burnout temperature,general combustion performance of the industrial sludge can also be improved.