Investigation of Methane Oxy-Fuel Combustion in a Swirl-Stabilised Gas Turbine Model Combustor

Mao Li, Yiheng Tong, Marcus Thern and Jens Klingmann
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Mao Li: Department of Energy Sciences, Lund University, Ole Römers väg 1, Lund SE-22100, Sweden
Yiheng Tong: Department of Energy Sciences, Lund University, Ole Römers väg 1, Lund SE-22100, Sweden
Marcus Thern: Department of Energy Sciences, Lund University, Ole Römers väg 1, Lund SE-22100, Sweden
Jens Klingmann: Department of Energy Sciences, Lund University, Ole Römers väg 1, Lund SE-22100, Sweden

Energies, 2017, vol. 10, issue 5, 1-16

Abstract: CO 2 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 2 on the fundamental characteristics of combustion, lean blowout (LBO) limits, CO emission and flame structures. CO 2 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 2 on the operational range of the combustor, equivalence ratio (?) 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 2 resulted in a lower reaction rate compared with the CH 4 /air flame. Fundamental combustion properties such as laminar flame speed, ignition delay time and blowout residence time were found to be affected by CO 2 . The experimental results revealed that CO 2 dilution resulted in a narrower operational range for the equivalence ratio. It was also found that CO 2 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 2 dilution did not have a significant impact on the flame structure.

Keywords: oxy-fuel; methane flame; lean blowout; CO emission; gas turbine combustion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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