添加剂对煤粉-污泥混合燃烧特性的影响及动力学

发布时间：2018-08-24 21:20

【摘要】：采用热重分析法考察污泥、煤粉以及两者混合样品的燃烧特性,通过着火温度(Ti)、燃尽温度(Tb)以及综合燃烧特性指数(S)的变化,进一步研究添加剂对污泥-煤粉混合燃烧特性的影响,并探讨催化燃烧机理。结果表明:添加污泥能够降低煤粉的Ti,加速煤粉热解燃烧,改善煤粉的燃烧性能;但当污泥掺混比10%时,混合样品的最大失重速率降低,Tb升高,综合燃烧性能S变差。CaO,Na_2CO_3能够促进挥发分析出燃烧,并带动后续固定碳的燃烧,因此混合样品的燃烧速率提高,燃烧时间缩短,综合燃烧性能改善;MnO_2,Fe_2O_3对混合样品的无明显催化作用,且降低了混合样品的最大燃烧速率。同时,动力学分析表明添加CaO,Na_2CO_3能够减小燃烧体系的活化能,而添加MnO_2和Fe_2O_3对混合样品的表观活化能无明显影响。
[Abstract]:The combustion characteristics of sludge, pulverized coal and mixed samples were investigated by thermogravimetric analysis. The changes of ignition temperature (Ti),) burnout temperature (Tb) and comprehensive combustion characteristic index (S) were studied. The effect of additives on the mixed combustion characteristics of sludge and pulverized coal was studied and the mechanism of catalytic combustion was discussed. The results show that the addition of sludge can reduce the Ti, of pulverized coal to accelerate the pyrolysis combustion of pulverized coal and improve the combustion performance of pulverized coal, but when the sludge blending ratio is 10, the maximum weight loss rate of the mixed sample decreases the increase of TB. The comprehensive combustion performance S variation. CaOG / Na2COS3 can promote volatilization and analysis combustion, and lead to the combustion of sequentially fixed carbon. Therefore, the combustion rate of the mixed sample is increased and the combustion time is shortened. The comprehensive combustion performance improved the catalytic activity of the mixed samples and reduced the maximum combustion rate of the mixed samples. At the same time, the kinetic analysis shows that the addition of CaO,Na_2CO_3 can reduce the activation energy of the combustion system, but the addition of MnO_2 and Fe_2O_3 has no obvious effect on the apparent activation energy of the mixed samples.
【作者单位】：北京科技大学土木与环境工程学院;中国科学院生态环境研究中心;
【基金】：科技北京百名领军人才培养工程资助项目(LJ201620)
【分类号】：X703;TQ534

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