Detail publikace
Posouzení vlivu vyšší koncentrace kyslíku ve spalovacím vzduchu (> 21 %) na charakteristické parametry spalování zemního plynu
BĚLOHRADSKÝ, P. SKRYJA, P. HUDÁK, I.
Český název
Posouzení vlivu vyšší koncentrace kyslíku ve spalovacím vzduchu (> 21 %) na charakteristické parametry spalování zemního plynu
Anglický název
Experimental study on the influence of oxygen content in the combustion air on the combustion characteristics
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
This study was focused on the experimental investigation of the very promising combustion technology called as the oxygen-enhanced combustion (OEC), which uses the oxidant containing higher proportion of oxygen than in the atmospheric air, i.e. more than 21%. The work investigated and compared the characteristics of two OEC methods, namely the premix enrichment and air-oxy/fuel combustion, when the overall oxygen concentrationwas varied from 21% to 46%. The combustion tests were performed with the experimental two-gas-staged burner of low-NOx type at the burner thermal input of 750 kW for two combustion regimes e one-staged and two-staged combustion. The oxygen concentration in the flue gas was maintained in the neighborhood of 3% vol. (on dry basis). The aim of tests was to assess the impact of the oxidant composition, type of OEC method and fuel-staging on the characteristic combustion parameters in detail. The investigated parameters included the concentration of nitrogen oxides (NOx) in the flue gas, flue gas temperature, heat flux to the combustion chamber wall, and lastly the stability, shape and dimensions of flame. It was observed that NOx emission is significantly lower when the airoxy/fuel method is used compared to the premix enrichment method. Moreover, when the fuel was staged, NOx emission was below 120 mg/Nm3 at all investigated oxygen flow rates. Increasing oxygen concentration resulted in higher heating intensity due to higher concentrations of CO2 and H2O. The available heat at 46% O2 was higher by 20% compared with that at 21% O2.
Český abstrakt
Práce byla zaměřena na porovnání dvou metod moderní kyslíko-palivové spalovací technologie nazývané jako "oxygen-enhanced combustion (OEC)", při které je koncentrace kyslíku ve spalovacím vzduchu vyšší než 21 %. Konkrétně byly vyšetřovány a porovnány tyto metody: spalování se směsí vzduch/čistý kyslík, a injektování vysoce čistého kyslíku přímo do jádra plamene. Při experimentálních zkouškách byly pozorovány tyto charakteristické parametry spalovacího procesu: koncentrace oxidů dusíku ve spalinách, distribuce tepelného toku po délce komory a tvar a stabilita plamene. Zkouškami bylo zjištěno, že emise NOx byly výrazně nižší při použití metody injektování čistého kyslíku do plamene než při spalování směsi vzduch/čistý kyslík. Současně vyšší koncentrace kyslíku ve spalovacím vzduchu měla pozitivní vliv na intenzitu přenosu tepla.
Anglický abstrakt
This study was focused on the experimental investigation of the very promising combustion technology called as the oxygen-enhanced combustion (OEC), which uses the oxidant containing higher proportion of oxygen than in the atmospheric air, i.e. more than 21%. The work investigated and compared the characteristics of two OEC methods, namely the premix enrichment and air-oxy/fuel combustion, when the overall oxygen concentrationwas varied from 21% to 46%. The combustion tests were performed with the experimental two-gas-staged burner of low-NOx type at the burner thermal input of 750 kW for two combustion regimes e one-staged and two-staged combustion. The oxygen concentration in the flue gas was maintained in the neighborhood of 3% vol. (on dry basis). The aim of tests was to assess the impact of the oxidant composition, type of OEC method and fuel-staging on the characteristic combustion parameters in detail. The investigated parameters included the concentration of nitrogen oxides (NOx) in the flue gas, flue gas temperature, heat flux to the combustion chamber wall, and lastly the stability, shape and dimensions of flame. It was observed that NOx emission is significantly lower when the airoxy/fuel method is used compared to the premix enrichment method. Moreover, when the fuel was staged, NOx emission was below 120 mg/Nm3 at all investigated oxygen flow rates. Increasing oxygen concentration resulted in higher heating intensity due to higher concentrations of CO2 and H2O. The available heat at 46% O2 was higher by 20% compared with that at 21% O2.
Klíčová slova česky
Spalování s vyšším obsahem kyslíku, stupňovité spalování, oxidy dusíku, tepelný tok, tvar plamene
Klíčová slova anglicky
Oxygen-enhanced combustion, staged combustion, nitrogen oxides, heat flux, flame pattern
Rok RIV
2014
Vydáno
01.05.2014
Nakladatel
Elsevier LtD.
ISSN
0360-5442
Ročník
2014
Číslo
75
Strany od–do
116–126
Počet stran
11
BIBTEX
@article{BUT107671,
author="Petr {Bělohradský} and Pavel {Skryja} and Igor {Hudák},
title="Experimental study on the influence of oxygen content in the combustion air on the combustion characteristics",
year="2014",
volume="2014",
number="75",
month="May",
pages="116--126",
publisher="Elsevier LtD.",
issn="0360-5442"
}