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%

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%

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.46P

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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. Calculate: a) Weight of wet feed in kg/hr; b) Weight of water removed in kg/hr; c) Heat required in kW; and d) Volume of bunker oil in liters per hr if specific gravity of bunker oil is 0.9 and dryer efficiency is 60%.
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