抗生素菌渣与煤混合燃烧特性及其动力学分析

Co-combustion characteristics and kinetic analysis of antibiotic bacterial residue and coal

以抗生素菌渣、煤为研究对象,利用热重-差示扫描量热仪(TG-DSC)研究两种物质单独以及混合燃烧的燃烧特性,并采用Coats-Redfern法确定混合燃烧的动力学参数。分析菌渣掺混比和粒径对燃烧过程的影响,阐明菌渣与煤混合燃烧的可能以及超细化燃烧的优势。结果表明:抗生素菌渣与煤混合燃烧主要包括3个阶段,添加菌渣能明显改善煤的燃烧特性。随着菌渣掺混比例的增加,着火温度、燃尽温度呈现降低的趋势。超细、非超细混合燃烧燃尽特性指数在菌渣掺混比为30%时最高,分别为5.82×10^(-3)、5.49×10^(-3)。超细混合燃烧活化能均低于非超细混合燃烧,说明超细化燃烧有利于降低活化能。超细、非超细混合燃烧活化能E和指前因子A之间均存在动力学补偿效应。

The combustion characteristics of antibiotics bacterial residue, coal and both blends were investigated using thermogravimetry-differential scanning calorimetry（TG-DSC）, and the kinetic parameters of co-combustion was determined by Coats-Redfern method. The influence of bacterial residue blending ratio and particle size on combustion process was analyzed, and the possibility of co-combustion with coal and the advantages of superfine combustion were clarified. The results showed that co-combustion of antibiotic bacterial residue and coal mainly consisted of three stages, and adding bacterial residue can significantly improve the combustion characteristics of coal. With increasing bacterial residue blending ratio, the ignition temperature and burnout temperature decreased. Burnout characteristics index of superfine co-combustion and non-superfine co-combustion reached the maximum value at the bacterial residue blending ratio of 30%, which is 5.82×10-3 and 5.49×10-3, respectively. The activation energy of superfine co-combustion was lower than that of non-superfine co-combustion, indicating that the superfine combustion was beneficial to reduce the activation energy. There existed kinetic compensation effect on the activation energy E and the pre-exponential factor A of the superfine co-combustion and non-superfine co-combustion.