Quantification of carbon particulates produced under open liquid pool and prevaporised flame conditions: Waste cooking oil biodiesel and diesel blends

The soot volume fraction (SVF) of waste cooking oil (WCO) biodiesel and blends was quantified and compared under the same total carbon flow rate via two experimental setups, namely prevaporised diffusion jet flames and pool flames using extinction calibrated laser induced-incandescence (LII). The sp...

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Bibliographic Details
Published in:Fuel (Guildford) 2020-06, Vol.270, p.117469, Article 117469
Main Authors: Chong, Cheng Tung, Tian, Bo, Ng, Jo-Han, Fan, Luming, Ni, Shiyao, Wong, Kang Yao, Hochgreb, Simone
Format: Article
Language:English
Subjects:
Aromatic compounds
Biodiesel
Biodiesel fuels
Biofuels
Carbon
Cooking
Cooking oils
Diesel fuels
Diffusion rate
Extinction
Extinguishing
Flow rates
Flow velocity
Jet flow
Laser induced incandescence
Mixtures
Particulates
Soot
Soot volume fraction
Vapors
Waste cooking oil
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Summary:The soot volume fraction (SVF) of waste cooking oil (WCO) biodiesel and blends was quantified and compared under the same total carbon flow rate via two experimental setups, namely prevaporised diffusion jet flames and pool flames using extinction calibrated laser induced-incandescence (LII). The spatial SVF distribution shows that for diesel-rich fuels, soot formation peaks near the flame and is convected downstream, whereas biodiesel flames show a more evenly distributed SVF at the flame center region. An increase in biodiesel fraction in diesel results in a reduced propensity for soot, as evident in both pool and vapour flames. Comparison of the radial profiles of SVF along the centerline shows broader SVF profiles for pool flames, reflecting the longer residence times for soot diffusion and growth compared to vapour flames, which reflected the lower mass flux for the pool burner. The total soot produced from pool flames was found to be higher than vapour flame by a factor of two for the same fuel mass consumption rate. WCO biodiesel exhibited the lowest total SVF value regardless of flame type owing to the combined effects of lack of aromatic compounds and fuel chemistry. The soot primary particle sizes produced by WCO biodiesel show lower mean diameter values by a factor of approximately 1.5 compared to diesel-produced soot. The pool flames produced carbon particulates of larger mean diameter by around 22% and 8% for diesel and WCO biodiesel, respectively, relative to the counterpart vapour flames, as a result of extended soot surface growth period.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2020.117469