Chalmers University of Technology CFD MODELING OF SYNGAS
- Slides: 27
Chalmers University of Technology CFD MODELING OF SYNGAS COMBUSTION IN GAS TURBINE CONDITIONS Abdallah Abou-Taouk & Lars-Eriksson Division of Fluid Dynamics Department of Applied Mechanics TURBOPOWER Conference 2012 -04 -24 Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Outline • • Introduction Kinetic Modeling CFD Modeling Results & Discussions Future Work Publications Summary Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Introduction • The number of combustion systems used in the world today is rapidly growing • This induces pollution and environmental problems • Improved combustion technology in terms of efficiency and pollutant emissions important • Development of combustor technology is currently following the general trend towards fuel-flexibility and increased use of bio fuels. SGT-750 Turbomachinery & Aero-Acoustics Group GE-9 E…
Chalmers University of Technology Introduction Turbulence – Chemistry Interaction Kinetics 2 & 4 -step global schemes methane/air 4 -step global scheme syngas 2 -step global scheme Selective Non-Catalytic Reduction De. NOx, joint collaboration INSA CORIA France CFD-Modeling EDM SGT-750 joint collaboration LTH FRC SGT-100 joint collaboration SIT Sweden & UK EDM/FRC Sandia Flame D Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Kinetics – M 4 scheme for Methane-Air mixture Laminar flame speed model in CHEMKIN coupled to the mode. FRONTIER 1. 2. 3. Lean optimization for 16 variables at Pin=1 bar, Tin=295 K-650 K simultaneously Freezing the obtained scheme and optimize the correction function at rich conditions Optimizing the pressure correction factor for Pin=1 -6 bar Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Kinetics – M 4 scheme for Methane-Air mixture Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Kinetics – M 4 scheme for Methane-Air mixture Good agreement for laminar flame speed, major species and adiabatic flame temperatures at different equivalence ratios and pressures Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Global Mechanism - Syngas mixture (CH 4+CO+H 2) CH 4 + 0. 5 O 2 CO + 2 H 2 + 0. 5 O 2 H 2 O CO + 0. 5 O 2 CO 2 CO + H 2 O CO 2 + H 2 Good agreement for laminar flame speed, major species and adiabatic flame temperatures at different equivalence ratios at atmospheric pressure Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology 2 -step global scheme Selective Non-Catalytic Reduction De. NOx • Optimizing a 2 -step (OPT_2 S) global scheme with the detailed NNH mechanism (207 reactions) A INLET Z=0 • Defining the mixing fraction Z • Optimization is done for the interval • Z: 0 – 0. 1 • T: 1100 K – 1400 K Y_O 2_A Y_H 2 O_A Y_N 2_A Y_NO_A Y_CO 2_A S_Y_A 0, 09388415 0, 22967024 0, 57623614 0, 00134204 0, 09886742 1 B INLET Y_H 2 O_B Y_NH 3_B S_Y_B 0, 75 0, 25 1 Z=1 • Using the mode. FRONTIER as the optimization tool together with the CHEMKIN software, the isothermal homogenous reactor Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Results 2 -step scheme vs. Detailed NNH (207 reactions) Figure showing the detailed NNH mechanism compared to the OPT_2 S scheme at different temperatures and Z values, τ = 0. 5 [s] Figure showing comparison between the detailed NNH mechanism, the reduced SNCR scheme and the OPT_2 S scheme at Z=0. 048, τ = 0. 5 [s] Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology CFD Results of SGT-750 • • SGT-750 is an industrial gas turbine designed and manufactured at SIT, Finspång Power output 37 MW Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology CFD – Meshing Code : ICEMCFD 12. 1 - Hexahedral mesh - 9. 5 -18 M cells High-Quality grid Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology CFD Modeling Methane-Air Mixture PIV data Emissions data: averaged at plane 7 Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Methane oxidation & OH radical Averaged transient reaction rate for methane oxidation using the SAS-SST model. Red: highest reaction rate, blue: lowest reaction rate Instantaneous plots from OH -PLIF measurements showing the OH radical at six different times. Averaged plot from the OH-PLIF measurements showing the OH radical. Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology CFD Results of SGT-100 • • SGT-100 is an industrial gas turbine designed and manufactured at SIT Ltd, UK Power output ranging from 4. 35 to 5. 7 MW Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Geometry– Meshing Code : ICEMCFD 12. 1 - Hexahedral mesh - 8. 2 M cells High-Quality grid Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Evaluation planes Measurements locations - 6 points - 4 PIV planes Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Normalized Axial Velocity, Non-reacting flow CASE B Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Normalized Radial Velocity, Non-reacting flow CASE B Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Contour plots LES, Non-reacting flow CASE B Averaged Pressure Averaged Axial Velocity Snapshot Pressure Snapshot Axial Velocity Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Normalized Velocity, reacting flow CASE A PIV plane 1 PIV plane 2 PIV plane 3 PIV plane 4 Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Temperature, reacting flow CASE A Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology CFD animation Contour of Temperature Iso-surface of highest Reaction rate Contour of CO Mass Fraction LES simulation with the new 4 -step scheme for methane-air, introduction of F factor in all reaction steps Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Future Work • Finalize work from the visiting time in INSA/ROUEN. • Writing a joint journal article regarding the chemistry optimization and a journal article regarding the LES modeling. • Finalize CFD simulation for the SGT-100 configuration, write a joint journal paper together with SIT Finspång and UK • Writing Ph. D thesis autumn 2013 • Defend spring 2014 Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Diploma Works • Master Thesis • 40 weeks: A. Khodabandeh, “CFD Modelling of Generic Gas Turbine Combustor”, Department of Applied Mechanics, Division of Fluid Dynamics, Chalmers University, Sweden, 2011. • 20 weeks: S. M. Mohseni, “Optimization of Global Reaction Mechanisms Evaluated on The Sandia Flame D, Department of Mechanical Engineering, Blekinge Institute of Technology, Karlskrona, Sweden, 2012. Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Publications • • A. Abou-Taouk and L. E Eriksson, “Optimized Global Mechanisms For CFD Analysis Of Swirl. Stabilized Syngas Burner For Gas Turbines”, ASME Turbo Power Expo, Power for land, Sea and Air, GT 2011 -45853, Vancouver, Canada, 2011. A. Abou-Taouk, R. Whiddon, I. R. Sigfrid and L. E. Eriksson, 2011, “CFD Investigation Of Swirl. Stabilized Flexi-Fuel Burner Using Methane-Air Mixture For Gas Turbines”, 20 th International Society for Airbreathing Engines, ISABE-2011 -1122, Gothenburg, Sweden. A. Abou-Taouk and L. E. Eriksson, “Evaluation of Optimized 3 -step Global Reaction Mechanism for CFD Simulations on Sandia Flame D”, The 6 th Symposium on Numerical Analysis of Fluid Flow and Heat Transfer, ICNAAM-2011 -0604, Halkidiki, Greece, 2011. A. Abou-Taouk, R. Whiddon, I. R. Sigfrid and L. E. Eriksson, ”A Four-Step Global Reaction Mechanism for CFD Simulations of Flexi-Fuel Burner for Gas Turbines”, 7 th International Symposium on Turbulence, Heat and Mass Transfer, Palermo, Italy, 2012. I. R. Sigrid, R. Whiddon, A. Abou-Taouk, R. Collin, and J. Klingmann, “Experimental Investigations of an Industrial Lean Premixed Gas Turbine Combustor With High Swirling Flow”, ASME Gas Turbine India Conference, GTIndia 2012 -9681, Mumbai, India, 2012. A. Abou-Taouk, S. Sadasivuni, D. Lörstad and L. E. Eriksson, ”Evaluation of Global Mechanisms for LES Analysis of SGT-100 DLE Combustion System”, ASME Turbo Power Expo, Power for land, Sea and Air, GT 2013 -95454, San Antonio, Texas, USA, 2013. B. Farcy, A. Abou-Taouk, L. Vervisch, P. Domingo, N. Perret ”Numerical Modeling of Selective Non Catalytic Reduction De. NOx Process”, 7 th European Combustion Meeting, Lund, Sweden, 25 -28 June 2013. Lic. Thesis presented Nov 2011. Turbomachinery & Aero-Acoustics Group
Chalmers University of Technology Summary • • • A promising optimization methodology has been developed: 2 -4 step global schemes have been optimized for methane-air, syngas and Selective Non-Catalytic Reduction De. NOx Successful validation of the CFD model compared to a prototype burner of the SGT-750 engine and the SGT 100 burner in terms of temperature, emission and velocity data Thank you for your attention Turbomachinery & Aero-Acoustics Group