具有火焰稳定船的直流煤粉燃烧器内三维湍流流场的实验研究

EXPERIMENTAL INVESTIGATION FOR 3-D TURBULENT FLOW FIELDS IN A TANGENTIAL PULVERIZED- COAL BURNER WITH A BOAT-SHAPED FLAME STABILIZER

一、引言 具有火焰稳定船的直流煤粉燃烧器是一种新型的高效低污染燃烧器,已成功地应用于电站煤粉锅炉上。实践表明,它不仅能降低锅炉的启动点火用油,使煤粉锅炉在低负荷下稳定燃烧,而且能减少NO_x的排放量。以往对该燃烧器的研究主要着重于工业应用,还未对其内部湍流流场进行全面地实验研究。

The mean-time velocity fields, Reynolds stress tensor and the efficient kinematic viscosity in a burner with a boat-shaped stabilizer were determined by a hot-wire technique. The particular structure of the air stream and the distribution of Reynolds stress in the burner were analysed. So, the principle of the pulverized-coal flame stabilization in the burner was given.