Browsing by Author "Wan Adibah Wan Mahari"

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    Pyrolysis Recovery of Waste Shipping Oil Using Microwave Heating
    (Energies, 2016) Wan Adibah Wan Mahari; Nur Fatihah Zainuddin; Wan Mohd Norsani Wan Nik; Cheng Tung Chong; and Su Shiung Lam
    This study investigated the use of microwave pyrolysis as a recovery method for waste shipping oil. The influence of different process temperatures on the yield and composition of the pyrolysis products was investigated. The use of microwave heating provided a fast heating rate (40 _C/min) to heat the waste oil at 600 _C. The waste oil was pyrolyzed and decomposed to form products dominated by pyrolysis oil (up to 66 wt. %) and smaller amounts of pyrolysis gases (24 wt. %)and char residue (10 wt. %). The pyrolysis oil contained light C9–C30 hydrocarbons and was detectedto have a calorific value of 47–48 MJ/kg which is close to those traditional liquid fuels derived fromfossil fuel. The results show that microwave pyrolysis of waste shipping oil generated an oil product that could be used as a potential fuel.
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    Recovery of diesel-like fuel from waste palm oil by pyrolysis using a microwave heated bed of activated carbon
    (Energy, 2016) Su Shiung Lam; Wan Adibah Wan Mahari; Chin Kui Cheng; Rozita Omar; Cheng Tung Chong; Howard A. Chase
    Microwave pyrolysis using a well-mixed bed of activated carbon as both the microwave absorber and reaction bed was investigated for its potential to recover useful products fromwaste palm cooking oil e a cooking oil widely used in Asia. The carbon bed provided rapid heating (~18 C/min) and a localized reaction hot zone that thermally promoted extensive pyrolysis cracking of the waste oil at 450 C, leading to increased production of a biofuel product in a process taking less than 25 min. It also created a reducing reaction environment that prevented the formation of undesirable oxidized compounds in the biofuel. The pyrolysis produced a biofuel product that is low in oxygen, free of sulphur, carboxylic acid and triglycerides, and which also contains light C10-C15 hydrocarbons and a high calorific value nearly comparable to diesel fuel, thus showing great potential to be used as fuel. This pyrolysis approach offers an attractive alternative to transesterification that avoids the use of solvents and catalysts, and the need to remove free fatty acids and glycerol from the hydrocarbon product. The pyrolysis apparatus operated with an electrical power input of 1.12 kW was capable of producing a biofuel with an energy content equivalent to about 3 kW, showing a positive energy ratio of 2.7 and 73% recovery of the energy input to the system. The results show that the pyrolysis approach has huge potential as a technically and energetically viable means for the recovery of biofuels from the waste oil.