Session: 04-41 Combustion Experiments V

Paper Number: 153840

Experimental Study on the Effect of Fuel Component Ratio on the Combustion Characteristics of Syngas in a Mild Model Gas Turbine Combustor 

 The use of syngas as an fuel in gas turbines as an alternative to conventional natural gas is an attractive option due to the availability of syngas in various ways and its clean combustion characteristics. In the present study, the effects of two different syngas compositions from coal gasification on the combustion characteristics of the MILD model combustor are compared. The lean blowout limits of two different CO/H₂/N₂ mixtures with varying ratios was experimentally investigated at ambient temperature and pressure.The dynamic pressure characteristics and nitrogen oxide emissions of syngas were experimentally measured at different adiabatic flame temperatures. The OH* images taken by the image-enhanced high-speed camera were used to characterize and compare the reaction zone characteristics of these two different kinds of syngas. The results show that in terms of dynamic stability, stable combustion of syngas fuel can be achieved in the MILD model combustion chamber within the range of experimental operating conditions. The fact that a wide range of stable combustion of not only methane, different hydrogen blending range of methane-hydrogen mixtures and pure hydrogen fuels, but also syngas fuels can be realized in the same combustion chamber demonstrates the strong fuel adaptability of the MILD model combustor. Unlike conventional natural gas, syngas combustion was found to have different reaction zone characteristics with analyse of the OH* chemiluminescence emission images. At the same time, NO_x emissions from syngas combustion are maintained within 10 ppm@15%O₂ when the adiabatic flame temperature is within 2000 K. In the range of 1400 K-2000 K, CO emissions from syngas combustion are kept in the single-digit ppm@15%O₂ level.

Presenting Author: Ningjing Yang Institute of Engineering Thermophysics, Chinese Academy of Sciences

Presenting Author Biography: Ningjing Yang is a PhD student of Institute of Engineering Thermophysics (Chinese Academy of Sciences).The objectives of her research are (i) to investigate the low emission combustion technology for gas turbine, including flameless combustion, (ii) to analyze the influence of hydrogen content on pollutant emission and stability of combustion.

Authors:

Ningjing Yang Institute of Engineering Thermophysics, Chinese Academy of Sciences
Yan Xiong Institute of Engineering Thermophysics, Chinese Academy of Sciences
Zhigang Liu Institute of Engineering Thermophysics, Chinese Academy of Sciences
Xiang Xu Institute of Engineering Thermophysics, Chinese Academy of Sciences