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research-article

Effect of diffusers on the blowout stability and emission of pollutants of a liquid fueled swirl burner

[+] Author and Article Information
Viktor Józsa

Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, 1111 Budapest, Műegyetem rkp. 3., Hungary
jozsa@energia.bme.hu

Attila Kun-Balog

Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, 1111 Budapest, Műegyetem rkp. 3., Hungary
kunbalog@energia.bme.hu

1Corresponding author.

ASME doi:10.1115/1.4039056 History: Received August 21, 2017; Revised January 09, 2018

Abstract

The continuously stringent emission standards force the burner development to the lean combustion regime to have low CO and NOx emissions. Nevertheless, combustion stability issues emerge since the desired operating point approaches the lean blowout limit. In this paper, an atmospheric, 15 kW lean premixed prevaporizing-type swirl burner, equipped with a plain jet airblast atomizer, was investigated at various atomizing pressures and combustion air flow rates, using diffusers from 0° to 60° in 15°steps. Both the 15° and the 30° diffusers provided a 42% extended lean blowout stability compared to the original burner. However, the superior stability regime was encumbered by a rapidly increasing CO concentration while the NOx emission vanished due to the reduced mixture residence time. Interestingly, the 60° diffuser provided a moderately extended blowout stability limitation while the NOx emission slightly increased and the CO emission reduced compared to the original burner.

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