A rotary dryer fired with bunker oil having HHV = 10, 000 kcal/kg is to produce 20 MT/hr of dried sand with 0.5% moisture from wet feed containing 7% moisture. Specific heat of sand is 0.21 BTU/lb-°F. Temperature of wet sand is 30 °C and temperature of dried product is 115 °C. If the heater requirement, Qh = 2, 500 kW, calculate the mass of bunker oil in kg per hour if specific gravity of bunker oil is 0.8 and dryer efficiency is 70%

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