可控涡煤粉燃烧器的研究

Investigation on the Controllable-Voltex Pulverized-Coal Burner

本文首先叙述煤粉燃烧与回流的关系,从理论上阐明用回流来稳定煤粉燃烧的机理,着重叙述在钝体的基础上发展了一种新型的可控涡煤粉燃烧器,它不仅能有效的控制回流区的长度、宽度、回流率,而且加强气流的湍流强度。结果使火焰根部温度明显提高,炉膛温度也普遍提高,飞灰含碳量降低,锅炉效率提高。最后进行可控涡冷态和热态工况的计算机数值模拟,计算和试验结果是相一致的,取得较满意的成果。

This paper describes the relation between pulverized coal combustion and recircula-tion flow. On the basis of the bluff-body stabilizer, the controllable-voltex pulverized coal burner, a new type of pulverized coal burner. The burner can controll not only the length and width of recirculation zone, recirculating How rate, but also can strengthen the turbulent strength. Therefor, the flame temperature and the temperature in furnace are risen, the carbon loss in fly ash is reduced. The combustion efficiency is risen. At last, numerical simulation has been performed tor the cold and combustion condition. It is unifiable between numerical simulation and experiment results.