Session: 04-32 Emissions II

Paper Number: 127850

127850 - Emission and Operational Characteristics Analysis of Axially Staged Combustors Based on Overall Parameters 

    Due to increasing requirements for gas turbine efficiency, it is necessary to effectively control thermal NOx emissions while elevating the combustor outlet temperature, in order to meet increasingly stringent environmental regulations. At the same time, the prospective demand for carbon reduction and capture requires gas turbines to improve fuel flexibility, capable of burning syngases or fuels enriched by higher proportions of hydrogen. Gas turbine manufacturers has been testing the axially staged combustion technology on H-class gas turbines, which helps to reduce NO emissions, improve fuel flexibility, and reduce the risk of combustion stability. Considering that the majority of previous literature separately studies the impact of changes in individual parameters on emissions or stability, this paper will discuss the determination and optimization of axially staged combustors overall design parameters, namely the air, fuel, and residence time distribution ratios between the first and second staged burners, under the conditions of specified thermal power and emission levels. The main work includes: 1) developing a mathematical model for predicting pollutants in axially staged combustors, while studying the impact of staged parameters on NO, and analyzing the parameter range for low emission operation of axially staged combustors; 2) verifying the model by conducting chemical reaction network calculations using detailed chemical reaction mechanisms; 3) by using NO emissions as the objective function to optimize the staged parameters, two ranges of parameters that meet the emission requirements were obtained, respectively characterizing the lean and rich burn conditions of the first staged burner; 4) discussing the impact of changes in hydrogen content in fuels on the operating range. The results will provide guidance for expanding the operating range, improving fuel flexibility, and reducing emissions of axially staged combustors.

Presenting Author: Enguang Liang Tsinghua University

Presenting Author Biography: Enguang Liang is a Ph.D candidate in the Department of Energy and Power Engineering, Tsinghua University. His research interests include alternative fuels, emissions and instability of combustion for clean energy generation.

Authors:

Enguang Liang Tsinghua University
Zhijian Yu Tsinghua University
Chenjie Zhang Tsinghua University
Min Zhu Tsinghua University