Session: 04-32 Emissions II

Paper Number: 127517

127517 - Effects of Secondary Jet Angle Variation on Flow, Flame Structure and Emission in the Reburning Zone Under Axial Fuel Staging Combustion of CH4/NH3/H2 Fuel 

Axial Fuel Staging (AFS) combustion technology is an advanced low-pollution combustion technology for heavy-duty gas turbines. In order to reveal the combustion characteristics of reignition flame in axial fractional combustion, high-frequency PIV and CH-based self-luminescence techniques were used in this paper to explore the effects of changes in jet angles of 45°, 90° and 135° on the flow field of axial fractional combustion, the self-ignition position of the reignition flame, the flame form and the emission of pollutants. The results show that under the three jet angles, the self-ignition position of jet flame is only 90°, which can be adjusted by equivalent ratio. When the jet Angle is 90° and the equivalent ratio is 0.5-0.7, the jet combustion mode is self-ignition combustion detached flame. The self-ignition point of the reburning flame is located at the downstream of the jet hole, and the lifting height of the reburning flame is 10mm away from the lower wall of the combustion chamber, which has the lowest NOx emission. When the equivalent ratio exceeds 0.8, the ignition position of the reburning flame gradually stabilizes at the jet exit position, forming a continuous burning plume. When the jet Angle is 45°, the flame structure is similar to that of 90°, and the emission of NO is basically the same. When the jet Angle is 135°, the position of the reburning flame shifts upstream, and there is a longer high-temperature chemical residence time, so the CO emission is the lowest and the NO emission is the highest.

Presenting Author: Yuze Li Shanghai Jiaotong University

Presenting Author Biography: the author is a doctoral candidate from the School of Mechanical and Power Engineering, Shanghai Jiao Tong University, China. His research direction is advanced low-pollution combustion technology of hydrogen-fueled gas turbine combustor.

Authors:

Yuze Li Shanghai Jiaotong University
Yuansen Li School of Mechanical Engineering, Shanghai Jiao Tong University
Yunlai Xiao School of Mechanical Engineering, Shanghai Jiao Tong University
Yuliang Jia Advanced Power Research Institute, Hangzhou Steam Turbine Co. LTD
Xutong Zhu AVIC CHENGDU AIRCRAFT INDUSTRIAL(GROUP) CO., LTD
Bing Ge School of Mechanical Engineering, Shanghai Jiao Tong University
Shusheng Zang School of Mechanical Engineering, Shanghai Jiao Tong University