Influence of potassium chloride on PAH concentration during soot formation studied using laser-induced fluorescence

Mannazhi, Manu; Bergqvist, Saga; Bengtsson, Per Erik

doi:10.1016/j.combustflame.2021.111709

Cited by 5 publications

(8 citation statements)

References 36 publications

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“…In general, the signal starts appearing at ~ 4-5 mm HAB and increases steadily to attain a maximum at ~ 7-8 mm HAB. The variation of the LIF532 signal for the KCl cases were presented in our previous work [28]. The trends in the peak signal intensities for NaCl cases are similar to those of KCl cases, where the peak PAH-LIF signal decreased with increase in the concentration of added salt.…”

Section: Excitation At 532 Nmsupporting

confidence: 74%

“…The present study is a continuation of previous work [28], where PAH-LIF measurements on premixed ethylene-air flames added with KCl showed that KCl negligibly influences the formation of smaller PAHs while decreasing the formation of larger PAHs. In the present study, the influence of various potassium and sodium salts on PAH formation was investigated.…”

Section: Introductionsupporting

confidence: 75%

“…The similarity between the profiles (above 5 mm HAB) lead us to the conclusion that varying the anion in the salt does not seem to influence the concentration of small PAHs at higher HABs. In our previous study, it was also observed that KCl addition negligibly influence the formation of smaller PAHs (2-3 rings) [28].…”

Section: Excitation At 266 Nm-detection At 320 Nmmentioning

confidence: 83%

“…1b. Some important aspects of the setup are discussed here, while a more detailed description on the optical setup is given in [28]. PAH-LIF measurements were performed using Nd:YAG lasers (Quantel Brilliant-b, repetition rate 10 Hz) operated at the wavelengths 532 nm and 266 nm.…”

Section: Methodsmentioning

confidence: 99%

“…Several fundamental studies have been performed in wellcharacterized flames on laboratory burners to investigate the influence of potassium and sodium on soot formation [19][20][21][22][23][24][25][26][27][28]. Addition of KCl to partially premixed ethylene-air flames was found to reduce soot volume fraction while showing negligible effects on primary and sub-primary particle sizes [19].…”

Section: Introductionmentioning

confidence: 99%

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Laser-induced fluorescence for studying the influence of potassium and sodium salts on PAH formation in sooting premixed flames

2022

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Previous studies have shown that alkali salts influence combustion processes and soot formation, although the effects seem to vary across systems. Moreover, fundamental studies on the effect of potassium and sodium salts on formation of polycyclic aromatic hydrocarbons (PAH), which are precursors in soot formation, are scarce. Here, we report a study in which the effects on PAH formation due to the addition of alkali metal salts (KCl, KOH, K2CO3, NaCl and NaOH) to premixed ethylene–air flames were investigated. Different size classes of PAHs were probed using both spectral and 2D measurements of laser-induced fluorescence (PAH-LIF) using the excitation wavelengths 266 nm and 532 nm, while detecting the fluorescence emission at selected wavelength ranges. Elastic light scattering (ELS) measurements were also used to complement the fluorescence data. It was found that potassium and sodium salts do not significantly influence the formation of small PAHs (2–3 rings), while decreasing the concentration of larger PAHs at higher heights above burner (HAB). Another important result was that the anion in the salt (Cl−, OH−, CO32−) negligibly influences the PAH and soot formation processes after dissociation of the salts.

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Section: Excitation At 532 Nmsupporting

confidence: 74%

Section: Introductionsupporting

confidence: 75%

Section: Excitation At 266 Nm-detection At 320 Nmmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%