沥青热解残炭的燃烧特性

与轻质油品(汽油、柴油等)燃烧特性不同,重质燃料油在燃烧时,首先发生燃料的热分解,分解的产物扩散到气相空间发生着火、燃烧,最后剩下固体残炭,然后残炭再着火、燃烧,由于残炭的燃烧属于异相反应,比燃料气与空气的同相反应慢,导致其燃尽时间明显变长,文献[1]给出了沥青和十二烷单滴的燃烧过程温度变化曲线,从曲线可以看出,残炭的燃烧阶段明显比气体的燃尽时间长,而残炭的质量只为沥青质量的10%～20%[2,3]。虽然残炭含量低,但它在整个燃烧过程中占有十分重要的地位;文献[4]利用热重系统研究了渣油热加工的副产物石油焦的燃烧特性,主要从…

COMBUSTION CHARACTERISTICS OF COKE FROM ASPHALT PYROLYSIS

The combustion characteristics of the coke from the pyrolysis of asphalt have been studied using thermogravimetric analysis at atmospheric pressure. The samples were heated to the preset temperature under nitrogen which was changed into air quickly. The coke was burnout. A first-order model was established to describe combustion of the coke. In the model, the activation energy, E, is independent of the type of coke, and equal to 180 kJ/mol. The frequency factor not only depends on the coke type, but also the combustion conditions, such as temperature.