Abstract
In this study, to reduce the amount of pollutant PAH and soot in the flame, we examined the burner system equipped with a center air injection. For this purpose, by using PAH-LIF and soot LII, we evaluated relative PAH and soot amounts in both the triple port burner and the conventional co-axial burner (double port burner) to discuss effects of center air injection on the formation of PAH and soot. The fuel was propane. In the triple port burner, two different blue flames are observed near the burner rim, followed by bright luminous flames with soot. The flame length is longer when the fuel flow velocity is increased. On the other hand, the flame length is shorter with an increase in internal air flow velocity. As for PAH and soot, these amounts of the triple port burner are much smaller than those of the double port burner. For the triple port burner, due to the center air injection, the fuel consumption occurs in both inner and outer flames. On the other hand, for the double port burner, the oxygen is supplied from one side air, and as a result, the fuel consumption rate is relatively lower. Hence, by the center air injection, the fuel consumption is largely accelerated, resulting in the reduction of PAH and soot.
Highlights
In recent years, the worsening of environmental problems such as global warming and atmospheric pollution has been reported
The internal and external air flow velocities were fixed at U1A = 19.4 cm/s and U3A = 18.4 cm/s, while the fuel flow velocity was varied for U2F = 1.2, 2.0, and 2.8 cm/s
By using polycyclic aromatic hydrocarbons (PAHs)-laser-induced fluorescence (LIF) and soot laser-induced incandescence (LII), we examined relative PAH and soot amounts of the triple port burner and the conventional co-axial burner
Summary
The worsening of environmental problems such as global warming and atmospheric pollution has been reported. One of the substances that cause atmospheric pollution is particulate matter including soot widely emitted from diesel vehicles, combustion furnaces, and other applications [1]. The precursor substances known as polycyclic aromatic hydrocarbons (PAHs) are profoundly related to soot formation [2]. A fully coupled simulation of PAH and soot growth has been conducted [3]. PAH contains many carcinogens, making it necessary to reduce the emission of PAH as well. To control their emissions, it is necessary to measure
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