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利用热分析法研究了富氧条件下高炉喷吹煤粉的燃烧特性。结果表明,富氧气氛可以改善煤粉燃烧特性,使煤粉着火点、失重峰提前,失重峰值增大,燃尽温度降低,综合燃烧特性指数明显提高,燃烧特性得到改善。当氧的体积分数小于40%时,煤粉燃烧特性改善幅度较大;氧的体积分数大于40%时,煤粉燃烧特性改善趋势变缓。同时采用非等温模型Flynn-Wall-Ozawa(FWO)对富氧之后煤粉燃烧过程进行动力学分析,当氧的体积分数由21%增加到100%,煤粉燃烧活化能从95.15kJ.mol-1增加到169.99kJ.mol-1。
The combustion characteristics of pulverized coal injection blast furnace blasting were studied by means of thermal analysis. The results show that the oxygen-enriched atmosphere can improve the combustion characteristics of pulverized coal, advance the ignition point and weightless peak of pulverized coal, increase the peak of weightlessness, decrease the burnout temperature, improve the comprehensive combustion index and improve the combustion characteristics. When the volume fraction of oxygen is less than 40%, the combustion characteristics of pulverized coal improve greatly; when the volume fraction of oxygen is more than 40%, the improvement of pulverized coal combustion characteristics tends to slow down. At the same time, the non-isothermal model Flynn-Wall-Ozawa (FWO) was used to analyze the combustion process of pulverized coal after oxygen enrichment. When the volume fraction of oxygen increased from 21% to 100%, the activation energy of coal combustion increased from 95.15kJ.mol- 1 to 169.99 kJ.mol-1.