Experimental Study of Influence of Secondary Combustion on Combustion Characteristics of Axial Staged Combustor

doi:10.16183/j.cnki.jsjtu.2023.076

Abstract

Abstract:

In order to obtain the influencing rule of secondary combustion on emissions and combustion oscillation characteristics of gas turbine axial staged combustor in non-premixed combustion mode and explore a load increasing mode with stable low emission, an axial staged combustor for F-class gas turbines is selected for experimental study. The results show that CO consumption is restrained and CO emission increases sharply when secondary fuel is added at a lower combustor outlet temperature. The addition of secondary fuel and the increase of secondary equivalence ratio lead to the reduction of NO_x emission, but the increase of load can weaken the ability of secondary fuel to reduce NO_x emission. The addition of secondary fuel and the increase of secondary equivalence ratio restrain the combustion oscillation in the low frequency band (75—90 Hz). When the secondary equivalence ratio is higher than a certain threshold (0.19), the addition of secondary fuel can restrain higher frequency(175—210 Hz) combustion oscillation. In addition, by comprehensively considering the influence of secondary combustion on emissions and combustion oscillation, the operating range and load increasing mode of low emissions and stable combustion of axial staged combustor in the higher load range (20%—50% load) are obtained, which provides a reference for stable low emission operation of the unit during load increasing.

Key words: axial staged combustor, non-premixed combustion mode, secondary combustion, emission, combustion oscillation

CLC Number:

TK471

SUI Yongfeng, ZHANG Yuming, ZANG Peng, JIA Yuliang, HENG Sijiang, FU Yanni, GE Bing. Experimental Study of Influence of Secondary Combustion on Combustion Characteristics of Axial Staged Combustor[J]. Journal of Shanghai Jiao Tong University, 2024, 58(8): 1139-1147.

Figures/Tables 10

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燃料分配方式	负荷/ %	T_out/ ℃	空气流量/ 设计点空气流量	头部当量比	Φ_s
值班、值班+次级	20	850	1.18	0.40~0.46	0~0.12
	30	940	1.15	0.41~0.50	0~0.19
	40	1 030	1.09	0.39~0.56	0~0.35
	50	1 100	1.04	0.53~0.58	0~0.10