滇池底泥混燃特性及燃烧动力学分析  

Co-combustion Characteristics and Kinetic Analysis of Sediment From Dianchi Lake

作　　者：郑欣昱 陈嘉霖 张飞 王随林 刘磊 苑鹏 武琪 黄中 ZHENG Xinyu;CHEN Jialin;ZHANG Fei;WANG Suilin;LIU Lei;YUAN Peng;WU Qi;HUANG Zhong(School of Environmental and Energy Engineering,Beijing University of Civil Engineering and Architecture,Daxing District,Beijing 100044,China;Key Laboratory of Thermal Science and Power Engineering of Ministry of Education(Department of Energy and Power Engineering,Tsinghua University),Haidian District,Beijing 100084,China;Yunnan Energy Investment Group Co.,Ltd.,Kunming 650000,Yunnan Province,China;Yunnan Energy Investment Honghe Power Generation Co.,Ltd.,Kaiyuan 661600,Yunnan Province,China)

机构地区：[1]北京建筑大学环境与能源工程学院,北京市大兴区100044 [2]热科学与动力工程教育部重点实验室(清华大学能源与动力工程系),北京市海淀区100084 [3]云南省能源投资集团有限公司,云南省昆明市650000 [4]云南能投红河发电有限公司,云南省开远市661600

出　　处：《发电技术》2025年第1期180-189,共10页Power Generation Technology

基　　金：云南省重点研发计划项目(202403AA080020);中央高校基本科研业务费专项资金资助(2022ZFJH004)。

摘　　要：【目的】城市河道及湖泊多是污水的承载体,沉积有大量含氮高、重金属元素富集的底泥,采用燃烧处置具有清洁高效、经济环保等特点,研究其燃烧动力学特性对于处置利用有重要意义。【方法】采用热重分析法,先对比分析滇池底泥的单燃特性,为了给实际工程应用提供参考,将底泥与煤按照底泥10%、20%、30%的比例混燃,并通过Kissinger-Akahira-Sunose(KAS)、Flynn-Wall-Ozawa(FWO)和Coats-Redferm(Coats)法,选取11种常用动力学机理函数和固态反应机制函数,拟合各反应阶段活化能和机理函数。【结果】底泥燃烧分为4个阶段,相比于污泥煤泥,其着火温度较低,更易于燃烧,但燃尽温度较高,综合燃烧特性存在差距。底泥在不同升温速率下燃烧时,升温速率越低越利于燃烧;底泥与煤混燃存在协同效应,其相互作用对于燃尽特性有着积极影响,且随掺混比例的增加,着火性能得到了改善,但当掺混比例达到30%时,可燃特性指数明显减小,说明掺烧比例过大时,不利于改善燃料的燃烧性能。最终拟合结果显示,燃烧过程第二、三阶段反应机理一致,第四阶段不同。【结论】底泥可以作为一种燃料进行使用,底泥与煤混燃可以改善煤的着火性能,有利于煤的稳定燃烧,但比例不得超过30%,研究结果可为实际工程应用提供参考。[Objectives]Urban rivers and lakes often serve as carriers of sewage,with a large amount of sediment enriched with nitrogen and heavy metal elements.The combustion disposal method is clean,efficient,economical,and environmentally friendly.Studying the combustion kinetics of the sediment is crucial for its disposal and utilization.[Methods]The thermogravimetric analysis method is employed to compare and analyze the single combustion characteristics of the sediment in Dianchi Lake.In order to provide a reference for practical engineering applications,the sediment is co-combusted with coal at mixing ratios of 10%,20%,and 30%.Using KAS,FWO,and Coats methods,11 commonly used kinetic mechanism functions and solid-state reaction mechanism functions are selected to fit the activation energy and mechanism functions of each reaction stage.[Results]The combustion of sediment is divided into four stages.Compared with sludge and coal slurry,it has a lower ignition temperature,making it easier to burn,but a higher burnout temperature,indicating differences in the overall combustion characteristics.When sediment is burned at different heating rates,lower heating rates are more conducive to combustion.Co-combusting sediment with coal shows a synergistic effect,and their interaction has a positive impact on the combustion characteristics.As the mixing ratio increases,the ignition performance improves.However,when the mixing ratio reaches 30%,the combustibility index significantly decreases,indicating that excessive mixing ratio is detrimental to improving the combustion performance of the fuel.The final fitting shows that the reaction mechanisms in the second and third stages of the combustion process are consistent,while the fourth stage is different.[Conclusions]Sediment can be used as a fuel,burning of sediment and coal can improve the ignition performance of coal and conducive to the stable combustion of coal,but the mixing ratio should not exceed 30%.The research results provide a reference for practical engineering applicat

关 键 词：湖泊底泥 热重实验 底泥燃烧 燃烧性质 动力学分析 表观活化能 反应机理函数 掺混比例 

分 类 号：TK16[动力工程及工程热物理—热能工程]