Experimental study of Polycyclic Aromatic Hydrocarbons (PAHs) in n-Heptane laminar diffusion flames from1.0 to 3.0 bar. (1st December 2017)

• Record Type: Journal Article
• Authors: Zhou, Lei; Xiong, Gaihua; Zhang, Mengjie; Chen, Longfei; Ding, Shirun; de Goey, L.P.H.
• Is Part Of: Fuel. Volume 209(2017)
• Page Start: 265
• Page End: 273
• Publication Date: 2017-12-01
• Subjects: HAB height above the burner -- Hmb height of the brightest point -- Hmbp mean height of brightest point in PAHs signals -- Hmean-flame mean height of the flame -- ILIF intensity of the PAH-LIF signals -- ILIF&LII intensity of signals -- ILII intensity of the soot formation signals -- LIF laser induced fluorescence -- LII laser induced incandescence -- Wmean-flame mean width of the flame -- Wml width of the soot formation signals -- Wmp mean width of the PAHs signals; Laminar diffusion flames -- PAHs -- Soot -- n-heptane -- Elevated pressure -- LIF -- LII; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2017.07.074
• Languages: English
• ISSNs: 0016-2361

Abstract

Abstract: As PAHs (Polycyclic Aromatic Hydrocarbons) are the main precursor of soot formation during the combustion, the investigation of PAHs formation is essential for the understanding of the soot formation and soot reduction in combustion. In this study, a specially designed burner and the corresponding fueling system was used to stabilize a laminar diffusion flame of n-heptane up to 3.0 bar before it becomes unstable. Using the combination of LII (Laser Induced Incandescence) and LIF (Laser Induced Fluorescence) techniques, the PAHs and soot formation and their distributions in the studied flames were obtained and explained. The results showed that PAHs were almost surrounded by soot and were present in the lower part of the flame. Moreover, the integral soot and PAH intensities exhibited a power law dependence on the pressure, being proportional to p n with n of 1.38 ± 0.32 and 1.49 ± 0.25 respectively under the pressure range of 1.0–3.0 bar.