Study on the Combustion Process of Premixed Methane Flames with CO 2 Dilution at Elevated Pressures

Rafał Ślefarski
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Rafał Ślefarski: Poznan University of Technology, Piotrowo 3 Str., Chair of Thermal Engineering, 60-965 Poznan, Poland

Energies, 2019, vol. 12, issue 3, 1-17

Abstract: The article presents the results of experimental and numerical investigation of turbulent premixed methane flames diluted by carbon dioxide (up to 30%) at atmospheric and elevated pressures (up to 0.5 MPa). The study included the influence of fuel properties and operation parameters on the emission of NO x and CO as well as flame properties. The investigation has been prepared for two combustion system configurations (axisymmetric flames and flames supported by a pilot flame) in a wide range of air/fuel equivalence ratios (? = 0.42 ÷ 0.85). It has been reported that reduction of NO x emission by CO 2 fuel dilution reached a level of up to 45% in atmospheric conditions and 30% at elevated pressure, decreasing with a drop in the equivalence ratio. The results have shown influence of pressure on NO x composition, where for pressurized tests, NO 2 was doubled compared to atmospheric tests. Carbon monoxide emission rises with CO 2 content in the fuel as a result of thermal dissociation, but this phenomenon is mitigated by a pressure increase. Planar laser induced fluorescence (PLIF) study has shown that flame length decreases with an increase in pressure and CO 2 content in the fuel. Fuel staging increased NO x emission, especially for richer flames (? > 0.6) at low pressure, while CO increased in the whole range of equivalence ratios.

Keywords: carbon dioxide dilution; nitric oxide emission; gas turbine; elevated pressure; fuel staging combustion; PLIF; flame length (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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