Abstract
The recent growing attention to energy saving and environmental protection issues has brought attention to the possibility of exploiting syngas from gasification of biomass and coal for the firing of industrial plants included in the, so called, Integrated Gasification Combined Cycle power plants. In order to improve knowledge on the employ of syngas in lean premixed turbulent flames, a large scale swirl stabilized gas-turbine burner has been operated with a simplified model of H2 enriched syngas from coal gasification. The experimental campaign has been performed at atmospheric pressure, with operating conditions derived from scaling the real gas turbines. The results are reported here and consist of OH-PLIF (OH Planar Laser Induced Fluorescence) measurements, carried out at decreasing equivalence of air/fuel ratio conditions and analysed together with the mean aerodynamic characterisation of the burner flow field in isothermal conditions obtained through LDV (Laser Doppler Velocimetry) and PIV (Particle Image Velocimetry) measurements. The OH concentration distributions have been analysed statistically in order to obtain information about the location of the most reactive zones, and an algorithm has been applied to the data in order to identify the flame fronts. In addition, the flame front locations have been successively interpreted statistically to obtain information about their main features and their dependence on the air to fuel ratio behaviour.
Highlights
The attention to environmental protection and energy saving has increased in the last few decades, leading to more and more stringent regulations for power generation and transport emissions.Synthesis gas or “syngas” has shown to be a good opportunity to substitute, at least partially, fossil fuels in the near future
Due to the properties of the H2 -rich fuels, most of the studies about syngas combustion are operated with diffusion flames, e.g., [10,11,12,13,14,15], while in general a lower number of studies are present concerning lean premixed combustion experiments, e.g., [16,17,18,19,20,21,22,23], which was carried out exploiting different diagnostic techniques, such as OH Laser-Induced Fluorescence and Rayleigh thermography
The work presented here has been carried out employing a prototypical swirl stabilized real scale burner (500 kW power output in atmospheric operations), which implements the main current concepts of lean premixed combustors for gas turbine operations
Summary
The attention to environmental protection and energy saving has increased in the last few decades, leading to more and more stringent regulations for power generation and transport emissions. Due to the properties of the H2 -rich fuels, most of the studies about syngas combustion are operated with diffusion flames, e.g., [10,11,12,13,14,15], while in general a lower number of studies are present concerning lean premixed combustion experiments, e.g., [16,17,18,19,20,21,22,23], which was carried out exploiting different diagnostic techniques, such as OH Laser-Induced Fluorescence and Rayleigh thermography. To the best of author’s knowledge, such a lack of data is evident when considering turbulent flames in real scale gas turbine geometries In such a scenario, the work presented here has been carried out employing a prototypical swirl stabilized real scale burner (500 kW power output in atmospheric operations), which implements the main current concepts of lean premixed combustors for gas turbine operations. The results are reported in the paper in order to provide the reader with the aerodynamic characteristics of the considered combustor
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