强化高温烟气回流的研究与实践

An Investigation on the Application of Intensified Reflow of Hot Gas Stream

本文从钝体回流区热质交换机理出发,提出了回流区边界用小流量、高速度的附加射流来强化回流区的热质交换以达到进一步强化劣质煤、无烟煤和其它难燃煤种的燃烧过程的根据。试验结果表明,附加射流能使回流区温度提高,对火焰有明显稳定作用。文章介绍了这一设想在大型电站锅炉上进行实验的数据。

Based on the mechanism of heat and mass transfer in the reflow zone of a bluff-body, an additional jet of small volume and high velocity flow for intensifying heat and mass transfer on the boundary of the reflow zone is suggested. It is expected to intensify the combustion process of low-grade coal, anthracite and other types of hard-to-burn coal. Experimental results show taat the idea is correct. The additional jet can increase the temperature in the reflow zone and significantly stabilize the flame. The data supposed to be used in future tests in some power plant boilers are given.