污泥与煤和煤矸石共燃特性研究

利用STA 409 PC型同步热分析仪，对煤、煤矸石和污泥不同质量比样品的燃烧过程进行了热重分析。结果表明，单一煤和煤矸石的DTG曲线都只有一个明显的失重峰，污泥的DTG曲线有两个明显的失重峰，而混合物的DTG曲线都有两个失重峰。通过分析不同样品的混燃过程，发现随着煤所占质量比的增加，最大失重峰速率所对应的温度都有所降低。煤、煤矸石、污泥及其混合物的活化能为16.93kJ/mol～109.89kJ/mol。随着污泥所占质量比的增加，混合物的着火温度有所降低，当达到70%时，污泥与煤混合物的着火点接近单一污泥的着火点。

Characteristics of co-combustion of coal, coal gangue and sewage sludge

The tests of co combustion of the blends of coal, coal gangue and sewage sludge were carried out in a thermogravimetric analyzer，model STA 409 PC，in which DSC TGA signals are simultaneously registered and both heat flow and weight loss profiles are obtained. The results indicate that the DTG curves of single coal and coal gangue only have one obvious peak of mass loss, but the DTG curve of sewage sludge has two obvious peaks of mass loss. Also, the DTG curves of the blends have two peaks of mass loss. It is found that the temperature corresponding to the maximum weight loss rate peak lowers with increasing the proportion of coal in the blends. The ignition temperature reduces with increasing the sewage sludge in the blends. When the sewage sludge ratio reaches 70%, the ignition point of the blends of sewage sludge and coal is very close to that of the sewage sludge.