JPS6454122A - Gas turbine burner - Google Patents

Abstract

PURPOSE:To stably burn a premixed flame on the side of a dilute mixed gas under a high-speed condition by providing a barrier member with respect to a premixed gas flow in the vicinity of an outlet part of an annular premixed flow passage thereby to form a stable flame in a recirculation flow region at the downstream of the barrier member. CONSTITUTION:An annular flow passage formed by an inner peripheral flow passage wall 6 and an outer peripheral flow passage wall 6 of the burner is partitioned peripherally by a flame holding plate 7. A second stage fuel is supplied to respective partitioned flow passages, and a premixed gas is supplied to a main chamber combustion cylinder 1. Further, a flame holding plate 7 at the outlet part of the annular flow passage is tapered toward the side of the inner peripheral flow passage wall, and a barrier member 8 is provided at the downstream inner peripheral flow-passage wall of the flame holding plate 7. This barrier member 8 is provided over the entire periphery of the inner peripheral flow passage wall. Thereby, immediately after passing of a part of the premixed gas flow along the inner peripheral flow passage wall 5 through the barrier member 8, the flow passage rapidly expands to create an exfoliation and to form a recirculation flow. In this recirculation flow, a stable small flame is formed since the staying time of the premixed gas is long, thus the stability of the main flow flame being improved.