神府煤粉燃烧特性

为了给煤粉锅炉用户提供煤粉优选理论依据,以煤粉锅炉主要用煤神府煤制备的煤粉为研究对象,采用TG-DTG对煤粉的燃烧特性进行研究,分析了不同煤粉及升温速率对煤粉燃烧特性的影响。结果表明:在空气气氛下,升温速率提高,TG、DTG曲线向高温方向移动,煤粉的着火温度升高,最大质量变化速率增大,最大失重温度提高,燃尽指数增大;随着灰分和粒径改变,升温速率为10或20℃/min时,煤粉的着火温度变化不显著,燃尽指数及综合燃烧特性指数均有影响。灰分减小,粒径不变时,D煤粉的综合燃烧指数为1.51,优于粒径74μm、灰分9.5%的P煤粉。

Combustion features of Shenfu pulverized coal

In order to provide a theoretical basis for coal-fired boiler utilization,pulverized coal produced from coal-fired boiler blending with Shenfu coal was investigated.Combustion characteristic of pulverized coal was studied by TG-DTG,and the influence of coal powder and heating rate on the combustion feature were also analyzed.Results show that under air atmosphere,the TG-DTG curves shift to high temperatures region with the increase of heating rate,and the ignition temperature,maximum weight loss rate,burnout index,as well as maximum weight loss temperature increase.The change of particle size and ash content demonstrates less effect on the ignition temperature at heating rate of 10 ℃/min or 20 ℃/min.While,it affects the burnout index and comprehensive combustion features,the comprehensive combustion features of D coal is 1.51,which is better than that of the pulverized coal P with particle size of 74 μm and ash of 9.5％.