细煤粉燃烧特性的热分析研究

Study on Thermal Analysis on Combustion Features of Pulverized Coal

采用热天平研究了细化鹤岗煤样的燃烧特性,分析了粒度、升温速率和氧气浓度对细化煤粉燃烧特性的影响。结果表明:在氧气充足,较慢的升温速率,粒度低于60μm的条件下,小粒度煤粉的燃尽性能优于大粒度煤粉,并且粒度的增加可使细煤粉的综合燃烧特性变差;升温速率的提高可使细煤粉的最大失重速率增大,最大失重速率对应的温度升高,有利于改善细煤粉的燃尽性能和综合燃烧特性;氧气浓度低于20%时,氧气浓度的增大可以改善细煤粉的燃尽特性和综合燃烧特性。

A thermal balance was applied to study the combustion features of the Hegang fined coal samples and analyzed the particle, temperature rising speed ratio and oxygen concentration affected to the combustion features of the fined pulverized coal. The results showed that when the oxygen content was sufficient, the temperature rising speed rate was slow and the particle was below 60p, m, the combustion performances of the small particle pulverized coal would be better than the large particle pulverized coal and the particle increased could make poorer to the comprehensive combustion features of the fined pulverized coal. The temperature rising speed rate increased would make the max weightlessness speed rate of the fined pulverized coal increased, the max weightlessness speed rate would make the relevant temperature increased and would be favorable to improve the combustion performances and comprehensive combustion features of the fined pulverized coal. When the oxygen content was below 20%, the oxygen content increased could improve the combustion performances and comprehensive combustion features.