On the Effect of Combustive Parameters and Various Air Flow Distribution on Combustion and NOx/CO Emissions in an Industrial Gas Turbine Combustor

[+] Author and Article Information
Mohsen Emami

Department of Mechanical Engineering, Isfahan University of Technology, Iran

Hamidreza Shahbazian

Department of Mechanical Engineering, Isfahan University of Technology, Iran

Bengt Sunden

Department of Energy Sciences, Lund University, Sweden

1Corresponding author.

ASME doi:10.1115/1.4040532 History: Received April 06, 2018; Revised May 30, 2018


Combustion of CH4 in an industrial gas turbine combustor and NO and CO formation/emission are simulated. The objectives are to investigate influence of combustive parameters and varying the percentage of distributed air flow rate in burning, recirculation and dilution zones on reactive flow characteristics, NOx and CO emissions. The governing equations of mass, momentum, energy, turbulence quantities RNG (k-e), mixture fraction are solved by the finite volume method. The formation and emission of NOx is simulated in a post-processing fashion, as the pollutant concentration is low compared to the main combustion species. Focus is on different physical mechanisms of NOx formation. The thermal-NOx and prompt-NOx mechanisms are considered for modelling the NOx source term in the transport equation. Results show that in a gas-fuelled combustor, the thermal NOx is the dominating mechanism for NOx formation. The simulations provids insight into the correlation between the maximum combustor temperature, exhaust average temperatures and the thermal NO concentration. The exhaust temperature and NOx concentration decrease while the excess air factor increases. As the combustion air temperature increases, the combustor temperature increases and the thermal NOx concentration increases dramatically. Furthermore, results demonstrate that the NO concentration at the combustor exit is maximum for a swirl angle of 55° and a gradual rise in the NOx concentration is detected as the combustion fuel temperature increases. In addition, results demonstrate that the air distribution at laboratory conditions is optimal while the mass fractions of NO and CO are minimum.

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