1,720,975 research outputs found
Detailed Chemistry Prediction of Time-Dependent Turbulent-Combustion within a Gasoil-Fueled Rapid-Mix Burner-Combustor System
No full textThe paper, in its first part, reports synthetically about the latest conceptual and numerical developments implemented into the CRFD (Computational Reactive Fluid Dynamics) parallel/clusterized solver NastComb, discussing in particular its most recently programmed detailed-chemistry mechanism. This scheme adopts a PASR (Partially Stirred Reactor) approach together with an SGI (Sub Grid Interaction) model in order to represent the turbulence-chemistry cross-influences. In the second part, preliminary results are given and discussed of the application of the code to an experimental, gasoil-fueled, LRPM (Liquid-fuel Rapid Pre-Mix) gas-turbine burner, characterized by ultra-low emissions. Comparisons with measured temperature data turn out quite positive, whilst the detailed chemistry provision allows to go deep into the mechanisms of radical and pollutant species formation
Detailed Chemistry Prediction of Time-Dependent Turbulent-Combustion within a Gasoil-Fueled Rapid-Mix Burner-Combustor System
No full textDesign features and performance data of a new 400 kW biomass gasification plant of downdraft type
No full textConversion to Natural Gas Operation of a Formerly Liquid-Fuelled Rapid-Mix Ultra-Low NOx Burner
No full textThe paper deals with the strategy conceived by the authors in order to convert a formerly liquid-fuelled burner technology, of fuel-air (ultra-lean) rapid-mix type, on to a gas-fuelled design, possibly preserving its excellent characteristics of ultra-low emissions and high flame-process stability. To this end, a combined theoretical-numerical and experimental effort has been pursued, typically in parametric mode, in order to find an optimised set of geometrical, fuel injection and functional provisions capable of taking advantage both of the previous experience in connection with liquid-fuel operation and of the necessary design changes required by the new gas-fuel application. The paper discusses, for these new operational conditions, the parametric numerical analysis so far performed, as well as the philosophy underlying the conversion of the burner design criteria from liquid to gaseous fuel operation. For each design variation or adjustment progressively conceived, the corresponding technological implementation has been realized, mounted on the burner test-rig and experimentally tested. Though preliminary, the experimental data presented in the paper confirm, in terms of combustion efficiency, stability and emissions, the attainment of a significant milestone toward the successful conversion of the burner to gas-fuel operation
Parametric Experimental Performance Analysis of a Downdraft Gasifier for Varying Biomass Mixtures
No full textExperimental Flame Front Characterisation in a Lean Premix Burner Operating with Syngas Simplified Model Fuel
No full textThe 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
Theoretical-Experimental Investigation of the Premixing Process Within an Ultra-Lean Gas Turbine Burner. Assessment of its Impacts upon Emissions and Stability.
No full textUnsteady Flow-Field Unreactive Experimental Characterisation and Velocity Fluctuations Analysis of an Ansaldo Energia Heavy Duty Gas Turbine Burner
No full textNumerical and experimental characterization of a 12 kWel downdraft woodchip gasifier for varying preheating temperatures of inlet air
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