不同含水率污泥与煤混烧的燃烧特性与反应动力学研究

The Rmogravimetric Analysis on the Co-Combustion Characteristics and Kinetic of Sewage Sludge with Different Moisture Contents and Power Coal

污泥热耦合煤发电是一种合理处置污泥的高效方法,为保证掺入的污泥与煤混合后能够稳定燃烧,需关注污泥的含水率、掺烧比例等因素。研究采用2种污泥分别制备高水和脱水污泥,并与煤进行不同比例混合,在热重台架上进行了热重/微商热重试验,探究了污泥种类、掺烧比例、含水率等对基础燃烧特性、燃烧动力学以及混烧协同交互反应的影响。结果表明:掺烧污泥可以改善煤样的着火性能,随着掺烧比例增加,着火温度、燃尽温度、活化能逐渐降低;污泥的含水率对燃烧过程有一定影响,脱水污泥的综合燃烧指数SN要高于高水污泥,混烧样品中污泥的含水率主要影响最大反应速率及其对应的温度,对指前因子和活化能也均有影响。污泥和煤的混烧交互反应表现出正向协同作用。适当的掺混质量比和含水率可以保证煤和污泥混烧稳定进行,为污泥与煤耦合发电的现场应用提供了指导。

Power generation of sewage sludge thermal coupling coal is a kind of efficient method for the rational disposal of sludge.In order to ensure that the mixed sludge can be stable combusted after mixing with coal,it is necessary to pay attention to the moisture content and mixing ratio of sludge.Through thermogravimetric experiment,the influence of different proportion of sludge mixing and moisture content in the combustion parameters,kinetic analysis and synergistic effects was investigated.The results show that the ignition performance of coal samples can be improved by mixing with sludge.With the increase of the proportion of sludge,the ignition temperature,burnout temperature and activation energy gradually decrease.The moisture content of sludge has a certain influence on the combustion process.The comprehensive combustion index SN of dehydrated sludge is higher than that of high-water sludge.In mixed samples,the moisture content of sludge can affect the maximum reaction rate and the corresponding temperature,and has an influence in the pre-exponential factor and activation energy.The co-combustion of sludge and coal shows a positive synergistic effect.Our study found that the appropriate mixing ratio and moisture content can ensure the stable combustion,which provides guidance for the field application of sludge and coal coupling power generation.