0
research-article

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
hr_shahbazian@me.iut.ac.ir

Hamidreza Shahbazian

Department of Mechanical Engineering, Isfahan University of Technology, Iran
hamidreza.shahbazian@energy.lth.se

Bengt Sunden

Department of Energy Sciences, Lund University, Sweden
bengt.sunden@energy.lth.se

1Corresponding author.

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

Abstract

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.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In