Development of a Dual-Energy Steam Boiler for Small-Scale Sterilization of Palm Fruit

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Author(s) A Isaac Bamgboye | D. N. Onwe
Pages 264-268
Volume 5
Issue 5
Date May, 2015
Keywords Sterilization, boiler, quality, palm fruit, dual-energy


A dual-energy source steam boiler suitable for sterilization of palm fruit by small scale processors was developed. The machine was evaluated on electricity or biomass such as charcoal and firewood. Palm fruits were sterilized at 100oC at various sterilization periods of 30, 45, 60, 75, 90, 105 and 120 minutes and at 60, 75 and 90oC for 75, 90, 105 and 120 minutes respectively. The rate of digestion through liquid recovery was determined. Some physicochemical properties of the oil extracted using steamed palm fruit and fruit boiled in water were determined. Sterilization period at 100oC was 60 min with charcoal, 75 min with firewood and electricity respectively. The average liquid recovery for the sterilization periods at 100oC were 13.7, 16.9, 28.4, 29.5, 28.7, 29.7 and 30.0%, and the maximum after 120 mins sterilization at 60, 75 and 90oC were 18.4, 20.8 and 28.1% respectively. The moisture content, the peroxide value and the free fatty acid contents were 0.1%, 8.0 O2/kg, 3.2%; and 2.3%, 10.0 O2/kg, 3.6% for the steamed and water-cooked fruits respectively. An improvement in the quality of oil produced from steamed fruits compared to fruits boiled in water was observed. The machine had a 98.9% boiling efficiency. The heating efficiency of cooking with biomass was 56.0% more than cooking with a pot of the same diameter. However, the cost of operating the machine with electricity was ₦4,320 ($28.8) for 8h/day/25days/month working time as against ₦9,600 ($60) and ₦15,250 ($101.6) respectively for firewood and charcoal for the same period. The cost of production of the boiler was ₦51,930 ($346.2).

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