利用热分析法研究CO_2对褐煤富氧燃烧特性的影响  

Thermogravimetry based analysis on the influence of CO_2 on oxy-fuel combustion characteristics of lignite

作　　者：胡昕[1] 周志军[1] 王智化[1] 游卓[1] 周俊虎[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《热力发电》2013年第3期15-24,共10页Thermal Power Generation

摘　　要：利用热分析法研究了准东褐煤和伊敏褐煤在21%O2浓度的O2/N2和O2/CO2气氛下的燃烧反应过程,得到其在不同气氛下的着火温度、燃尽温度、最大反应速率和最大反应速率温度等特征参数,同时计算各反应过程的综合燃烧特性指数,并基于Coats-Redfern法得出了各反应的动力学参数。试验结果表明:O2/CO2气氛下两煤种的燃烧反应均受到抑制,反应速率降低,反应时间延长;CO2对煤化程度更低的褐煤燃烧反应抑制作用更为明显。综合燃烧特性指数和动力学参数的计算结果与试验结果相符。The combustion characteristics of ZD lignite and YM lignite in O2/N2 and O2/CO2 atmospheres with O2concentration of 21% was investigated by thermogravimetry.Such combustion characteristic parameters as ignition temperature,burnout temperature,the maximum reaction rate and the maximum reaction rate temperature were obtained,and the comprehensive combustion characteristic index for each reaction was calculated.Moreover,by Coats-Redfern method,the reaction kinetic parameters were obtained.The experimental results showed that the lignite combustion was inhibited in O2/CO2 atmosphere,the reaction rate decreased and the reaction time lengthened.In addition,the CO2 had more obvious inhibition effect on lignite with lower coalification degree.The calculation results were consistent with that of the experiment.

关 键 词：褐煤 O2/N2 O2/CO2 燃烧特性 热分析 反应动力学 

分 类 号：TK16[动力工程及工程热物理—热能工程]