Tallow as a heating fuel. - Red Meat Innovation
Tallow as a heating fuel. - Red Meat Innovation
Tallow as a heating fuel. - Red Meat Innovation
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252015$/GJ1050Coal Fuel Oil <strong>Tallow</strong> Natural G<strong>as</strong> ElectricityFigure 2: Comparison of energy prices of various <strong>fuel</strong>sProperties of tallow and <strong>fuel</strong> oilTable 1 compares the properties of the commonly used <strong>fuel</strong> oils and tallow.Table 1: Physical and combustion properties of tallow and three grades of <strong>fuel</strong> oil (Spiers, 1955)Diesel Light Fuel Oil Heavy Fuel Oil <strong>Tallow</strong>Ultimate composition (%)CarbonHydrogenSulphurOxygen86.312.80.9086.212.41.4086.111.82.107011019Specific gravity at 15.5ºC 0.830 0.895 0.949 0.920Calorific value (kJ/kg)(kJ/L)45,70039,70044,20039,50043,10040,40040,00036,800Combustion air requirements:kg dry air/kg <strong>fuel</strong>m 3 air/kg <strong>fuel</strong> (0ºC, 760 mm Hg)14.4011.0914.2010.9914.0010.8515.6012.04Composition of wet flue g<strong>as</strong> (%)Carbon dioxide (CO2)Water (H2O)Sulphur dioxide (SO2)Nitrogen (N2)13.412.00.174.513.611.70.174.613.811.30.174.813.913.1073.0Fl<strong>as</strong>h point (ºC) 75.5 79.4 110.0 288 - 316There are several differences between tallow and <strong>fuel</strong> oils. <strong>Tallow</strong> does not contain sulphur, therefore the problem of formation of corrosiveacids from condensation in the stack does not exist. Flue temperature is normally kept above 150ºC with <strong>fuel</strong> oils to prevent condensation.Therefore lower flue temperatures can be used resulting in a net incre<strong>as</strong>e in boiler efficiency.
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