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Investigation of methane oxy-fuel combustion in a swirl-stabilised gas turbine model combustor

Li, Mao LU ; Tong, Yiheng LU ; Thern, Marcus LU and Klingmann, Jens LU (2017) In Energies 10(5).
Abstract

CO2 has a strong impact on both operability and emission behaviours in gas turbine combustors. In the present study, an atmospheric, preheated, swirl-stabilised optical gas turbine model combustor rig was employed. The primary objectives were to analyse the influence of CO2 on the fundamental characteristics of combustion, lean blowout (LBO) limits, CO emission and flame structures. CO2 dilution effects were examined with three preheating temperatures (396.15, 431.15, and 466.15 K). The fundamental combustion characteristics were studied utilising chemical kinetic simulations. To study the influence of CO2 on the operational range of the combustor, equivalence ratio (Φ) was varied from... (More)

CO2 has a strong impact on both operability and emission behaviours in gas turbine combustors. In the present study, an atmospheric, preheated, swirl-stabilised optical gas turbine model combustor rig was employed. The primary objectives were to analyse the influence of CO2 on the fundamental characteristics of combustion, lean blowout (LBO) limits, CO emission and flame structures. CO2 dilution effects were examined with three preheating temperatures (396.15, 431.15, and 466.15 K). The fundamental combustion characteristics were studied utilising chemical kinetic simulations. To study the influence of CO2 on the operational range of the combustor, equivalence ratio (Φ) was varied from stoichiometric conditions to the LBO limits. CO emissions were measured at the exit of the combustor using a water-cooled probe over the entire operational range. The flame structures and locations were characterised by performing CH chemiluminescence imaging. The inverse Abel transformation was used to analyse the CH distribution on the axisymmetric plane of the combustor. Chemical kinetic modelling indicated that the CO2 resulted in a lower reaction rate compared with the CH4/air flame. Fundamental combustion properties such as laminar flame speed, ignition delay time and blowout residence time were found to be affected by CO2. The experimental results revealed that CO2 dilution resulted in a narrower operational range for the equivalence ratio. It was also found that CO2 had a strong inhibiting effect on CO burnout, which led to a higher concentration of CO in the combustion exhaust. CH chemiluminescence showed that the CO2 dilution did not have a significant impact on the flame structure.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CO emission, Gas turbine combustion, Lean blowout, Methane flame, Oxy-fuel
in
Energies
volume
10
issue
5
publisher
MDPI AG
external identifiers
  • scopus:85035135237
  • wos:000403048400067
ISSN
1996-1073
DOI
10.3390/en10050648
language
English
LU publication?
yes
id
6a1fa93f-496c-41c4-9fc1-d152205898a6
date added to LUP
2017-12-11 07:55:34
date last changed
2018-04-08 05:02:47
@article{6a1fa93f-496c-41c4-9fc1-d152205898a6,
  abstract     = {<p>CO<sub>2</sub> has a strong impact on both operability and emission behaviours in gas turbine combustors. In the present study, an atmospheric, preheated, swirl-stabilised optical gas turbine model combustor rig was employed. The primary objectives were to analyse the influence of CO<sub>2</sub> on the fundamental characteristics of combustion, lean blowout (LBO) limits, CO emission and flame structures. CO<sub>2</sub> dilution effects were examined with three preheating temperatures (396.15, 431.15, and 466.15 K). The fundamental combustion characteristics were studied utilising chemical kinetic simulations. To study the influence of CO<sub>2</sub> on the operational range of the combustor, equivalence ratio (Φ) was varied from stoichiometric conditions to the LBO limits. CO emissions were measured at the exit of the combustor using a water-cooled probe over the entire operational range. The flame structures and locations were characterised by performing CH chemiluminescence imaging. The inverse Abel transformation was used to analyse the CH distribution on the axisymmetric plane of the combustor. Chemical kinetic modelling indicated that the CO<sub>2</sub> resulted in a lower reaction rate compared with the CH<sub>4</sub>/air flame. Fundamental combustion properties such as laminar flame speed, ignition delay time and blowout residence time were found to be affected by CO<sub>2</sub>. The experimental results revealed that CO<sub>2</sub> dilution resulted in a narrower operational range for the equivalence ratio. It was also found that CO<sub>2</sub> had a strong inhibiting effect on CO burnout, which led to a higher concentration of CO in the combustion exhaust. CH chemiluminescence showed that the CO<sub>2</sub> dilution did not have a significant impact on the flame structure.</p>},
  articleno    = {648},
  author       = {Li, Mao and Tong, Yiheng and Thern, Marcus and Klingmann, Jens},
  issn         = {1996-1073},
  keyword      = {CO emission,Gas turbine combustion,Lean blowout,Methane flame,Oxy-fuel},
  language     = {eng},
  number       = {5},
  publisher    = {MDPI AG},
  series       = {Energies},
  title        = {Investigation of methane oxy-fuel combustion in a swirl-stabilised gas turbine model combustor},
  url          = {http://dx.doi.org/10.3390/en10050648},
  volume       = {10},
  year         = {2017},
}