化工学报2018，Vol.69Issue(1)：523-530,8.DOI:10.11949/j.issn.0438-1157.20171038
基于热重-质谱联用的煤粉富氧燃烧动力学及污染物生成特性
Oxy-coal combustion kinetics and formation characteristics of pollutants based on TG-MS analysis
摘要
Abstract
Oxy-fuel combustion is one of the most promising CO2 capture technologies.The oxygen-enriched combustion of pulverized coal was simulated in a thermogravimetric analyzer coupled with a mass spectrometry (TG-MS) in order to understand the ignition model and the generation characteristics of pollutants during combustion.Bituminous and anthracite standard coals were selected as the samples.The tests were done with oxygen volume fractions of 21％, 30％ and 50％ with two kinds of atmospheres (O2/Ar and O2/CO2).In the O2/CO2 atmosphere, both of the ignition temperature and burnout temperature were lower, the combustion rate was improved, the combustion time was shortened, and the combustion performance was much better.Based on the TG/DTG curves, the ignition models of pulverized coal were judged.It was showed that the heterogeneous ignition of pulverized coal happened in O2/Ar atmosphere, while the homogeneous ignition occurred in O2/CO2 atmosphere.Also, the activation energy and pre-exponential factor of coal combustion were calculated by Coats-Redfern method.When the oxygen volume fraction was above 30％, the apparent activation energy of the anthracite coal combustion in O2/CO2 atmosphere was significantly lower than that in O2/Ar atmosphere, indicating an obvious improvement in reactivity.In the same reaction conditions, the activation energy of bituminous coal was lower than that of anthracite coal, and the former was more prone to ignition and combustion, showing better combustion performance.In the atmosphere of O2/CO2, the generation of CO and volatile-NO waspromoted, and the formation temperature was lower than in O2/Ar atmosphere.Meanwhile, the abundant CO would lead to NO reduction reaction.关键词
煤燃烧/富氧燃烧/动力学/污染物/热重-质谱联用Key words
coal combustion/oxy-fuel combustion/kinetics/pollutants/TG-MS分类
能源科技引用本文复制引用
刘倩,钟文琪,苏伟,贲昊玺..基于热重-质谱联用的煤粉富氧燃烧动力学及污染物生成特性[J].化工学报,2018,69(1):523-530,8.基金项目
国家重点研发计划项目(2016YFB0600802) （2016YFB0600802）
国家自然科学基金项目(51676039). supported by the National Key Research and Development Program of China (2016YFB0600802) and the National Natural Science Foundation of China(51676039). （51676039）
