Effects of Oxygen-Enhanced Combustion Methods on Combustion Characteristics of Non-Premixed Swirling Flames

Pavel Skryja, Igor Hudak, Jiří Bojanovsky, Zdeněk Jegla and Lubomír Korček
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Pavel Skryja: Institute of Process Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic
Igor Hudak: Institute of Process Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic
Jiří Bojanovsky: Institute of Process Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic
Zdeněk Jegla: Institute of Process Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic
Lubomír Korček: UNIS, a.s., Jundrovská 33, 624 00 Brno, Czech Republic

Energies, 2022, vol. 15, issue 6, 1-21

Abstract: The objective of the present study was to experimentally investigate and compare the characteristics of three oxygen-enhanced combustion (OEC) methods; premix enrichment (PE), air-oxy/fuel combustion (AO), and additionally also oxygen lancing (OL) method. The overall oxygen concentration varied from 21% to 38%. Combustion tests were carried out using the gas burner with the thermal input of 750 kW fired by natural gas. The characteristics of OEC methods, such as the concentration of nitrogen oxides and carbon monoxide in flue gas, in-flame temperatures distribution in the horizontal symmetry plane of the combustion chamber, heat flux to the combustion chamber wall, flue gas temperature, and the stability of flame were investigated. NO x emissions increased by more than 40 times and by 20 times for the PE method. The tests using the AO and OL methods with NO x emissions below 150 mg/Nm 3 at all oxygen concentrations showed significantly better results. For all OEC methods, radiative heat transfer increased with increasing oxygen concentration. The available heat was 20% higher at 38% O 2 than at 21% O 2 . The flue gas temperature decreased with increasing oxygen concentration, which was affected by a decrease in N 2 concentration in the oxidizer and a simultaneous increase in radiant heat flux.

Keywords: oxygen-enhanced combustion; nitrogen oxides; heat flux; in-flame temperature; flame stability; oxygen lancing method (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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