Parametric Study of High-Efficiency and Low-Emission Gas Burners

Shuhn-Shyurng Hou,Ching-Hung Chou

doi:10.1155/2013/154957

Shuhn-Shyurng Hou, Ching-Hung Chou

Open Access

https://doi.org/10.1155/2013/154957

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Abstract

The objective of this study is to investigate the influence of three significant parameters, namely, swirl flow, loading height, and semi-confined combustion flame, on thermal efficiency andCOemissions of a swirl flow gas burner. We focus particularly on the effects of swirl angle and inclination angle on the performance of the swirl flow burner. The results showed that the swirl flow burner yields higher thermal efficiency and emits lowerCOconcentration than those of the conventional radial flow burner. A greater swirl angle results in higher thermal efficiency andCOemission. With increasing loading height, the thermal efficiency increases but theCOemission decreases. For a lower loading height (2 or 3 cm), the highest efficiency occurs at the inclination angle 15°. On the other hand, at a higher loading height, 4 cm, thermal efficiency increases with the inclination angle. Moreover, the addition of a shield can achieve a great increase in thermal efficiency, about 4-5%, and a decrease inCOemissions for the same burner (swirl flow or radial flow).

Highlights

Much attention has been paid to higher thermal efficiencies and lower emissions of domestic gas burners since the everincreasing demand for energy saving and emission reduction [1,2,3,4,5,6,7,8,9,10,11,12,13]
Variations of thermal efficiency and CO emission versus swirl angle at a fixed thermal input 4.75 kW for the open flame and semiconfined flame at fuel supply pressure P = 280 mm H2O and loading height L = 2.5 cm are shown in Figures 6 and 7, respectively
At a higher loading height (L = 4 cm), thermal efficiency increases with inclination angle β

Summary

Introduction

Much attention has been paid to higher thermal efficiencies and lower emissions of domestic gas burners since the everincreasing demand for energy saving and emission reduction [1,2,3,4,5,6,7,8,9,10,11,12,13]. The domestic gas burner most extensively used is of the conventional Bunsen type (i.e., partially aerated) [6, 14, 15]. The typical partially aerated burner entrains primary air naturally by a momentumsharing process between the high velocity gas jet and the ambient air [6]. Designs of conventional domestic gas burners are mainly relied upon open combustion flame such that energy loss through the dispersion of the flue gas to the surroundings is very large, resulting in relatively low thermal efficiency [13]. If the dispersion of the flame or flue gas to the surroundings can be prolonged, the thermal efficiency can be improved

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