Simulation of Low-Btu Syngas Combustion in Trapped Vortex Combustor
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1 Simulation of Low-Btu Syngas Combustion in Trapped Vortex Combustor K. Zbeeb and C. Ghenai 1 Ocean and Mechanical Engineering Department College of Engineering and Computer
2 Outline Project Goal and Objectives Introduction Governing Equations Geometry, Mesh and Boundary Conditions Syngas Fuel Compositions and TVC Operating Conditions Validation of the CFD model Results Contours of Static Temperature Pressure Drop Combustor efficiency Emissions: CO and NOx Conclusions 2
3 Goal Develop Next Generation Gas Turbine Engines: Higher Efficiency Higher Operating Conditions (High Pressure and Temperatures) Lower Emissions meet the new emissions requirements Use flexible and alternative fuels such as High Hydrogen Content Fuels 3
4 Objectives CFD Analysis Predict the combustion performance (temperature, combustor efficiency and pressure drop) of two-fore body trapped vortex combustor (TVC) using alternative fuels (High Hydrogen Content Fuels) CFD Analysis - Predict the NOx, CO and other emissions from the vortex trapped combustor when natural gas fuel (methane) is replaced with alternative fuels such as hydrogen and synthetic gas produced from coal and biomass gasification 4 Develop new correlations for the
5 Introduction Trapped Vortex Combustor or TVC: Burn a wide variety of gas fuels with different compositions and heating values (low, medium and high Btu fuels). The syngas fuel are obtained from coal and biomass gasification. TVC - Accommodate pure hydrogen or high hydrogen gas fuel with high flame speeds TVC combustor using lean premixed combustion technologies provides low NOX emissions no need of exhaust gas after treatment or post combustion NOX emissions control using steam, nitrogen or CO2 5 TVC - Improve Combustion efficiency, flame
6 Challenges Transition from Natural Gas to Syngas Fuels Syngas fuels different compositions (H2, CH4, CO, CO2, N2, H2O) and heating values (low to medium lower heating values). This will affect the combustion performance and emissions. Need to determine these changes for different compositions, heating values and operating conditions. Syngas gas fuels lower heating value or lowbtu. To keep the same power need to increase the flow rate of the syngas fuels (4-6 times the flow rate of natural gas) 6
7 Challenges Transition from Natural Gas to Syngas Fuels Lean premixed combustion technology has been used successfully to control the NOx emissions with natural gas fuel. Risk of using this technology with syngas fuel with high hydrogen content potential of flash back of the flame into the fuel injector Diffusion or non premixed flame are used with syngas fuels to control the NOX The presence of inert gas (CO2, N2, H2O) in the syngas fuel are used to reduce the flame temperature and NOx emissions. 7
8 TVC Combustion Strategy Create a stable vortex system in a cavity, where fuel and oxidant are injected, mixed and burn with minimum pressure drop 8 8
9 FAU Trapped Vortex Combustor TVC Combustor Fuel and Air Injection System Air 8 fuel injectors 24 air injectors 9 After body Fuel
10 CFD Analysis Governing Equations Conservation of Mass Momentum Equations Turbulence K-ε model Combustion Pdf/Mixture fraction model for non premixed combustion Energy Equation Radiation P1 radiation model 10
11 Geometry, Mesh and Boundary Conditions 11
12 Syngas Fuel Compositions TVC Operating Conditions TVC operating conditions Syngas Fuel Compositions 12
13 Validation of the CFD results Fuel: Propane Power: 35 kw X = 10 mm Experimental Study X = 33 mm Losurdo, M.A., Bruno, C., Calchetti, G., Giacomazzi, E., Rufoloni, M.; XXV Event of the Italian Section of the Combustion Institute. 3-5 June Rome, Italy. 13 X = 45 mm
14 Results Contours of Static Temperature Fuel: Propane Power: 35 kw 14
15 Results OH Contours Schwarze Pumpe 15 P = 50 kw
16 Results NOX Contours Schwarze Pumpe P = 50 kw 16
17 Results Contours of Pressure Drop 17 P = 350 kw
18 Results Contours of Fuel Mass Fraction Combustor Efficiency = 1 Fuel Mass Fraction Combustor Efficiency Out In 18 P = 350 kw
19 Results Contours of Carbon Monoxide CO 19 P = 350 kw
20 Conclusions A computational fluid dynamics analysis of the combustion of propane, methane, pure hydrogen and three syngas fuels in Trapped Vortex Combustor were performed in this study The CFD results for the combustion of propane fuel inside the trapped vortex combustor compare well with the experimental data The fraction of hydrogen in the fuel affects the flame temperature and NOX emissions at the exit of the combustor. Higher the hydrogen fraction in the fuel, higher is the temperature inside the combustor and the NOx emissions at the exit of the combustor. The presence of small fractions of inert gas in the syngas fuel compositions such as CO2, N2, H2O will help to reduce the flame 20
21 Conclusions The results of the combustor efficiency show that the hydrogen fuel is the most efficient fuel among all the tested fuels, however the high NOX emissions and the cost and the storage of the hydrogen can be very challenging for real applications. Low NOx emissions were obtained for syngas fuels. Syngas fuel is an environmentally clean fuel and cost generally lower than other fuels. It can be used for a clean combustion with sensible reduction in pollutants emissions. 21
22 EFFECTS OF H2/CO FRACTION OF VARIOUS SYNGAS FUELS ON THE NOX DISTRIBUTION AT THE OUTLET OF THE TVC COMBUSTOR 22
23 EFFECTS OF H2/CO FRACTION OF VARIOUS SYNGAS FUELS ON THE CO DISTRIBUTION AT THE OUTLET OF THE TVC COMBUSTOR 23
24 EFFECTS OF H2/CO FRACTION OF VARIOUS SYNGAS FUELS ON THE TOTAL PRESSURE DROP OF THE TVC COMBUSTOR 24
25 EFFECTS OF H2/CO FRACTION OF VARIOUS SYNGAS FUELS ON THE EFFICIENCY OF THE TVC COMBUSTOR 25
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