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Chapter 4.2 - Furnaces

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Selected questions Chapter 4.2: Furnaces Short type questions 1. Write the formula to calculate the thermal efficiency of a furnace by direct method? Ans. Thermal efficiency of the furnace = Heat in the stock Heat in the fuel consumed for heating the stock The quantity of heat to be imparted (Q) to the stock can be found from Q = m x Cp (t1 t2) kcal/h Q = Quantity of heat of stock in Kcal m = Weight of the stock in Kg Cp = Mean specific heat of stock in kCal/kgoC t1 = Final temperature of stock desired, oC t2 = Initial temperature of the stock before it enters the furnace, oC Where Heat in the fuel consumed for heating the stock (kcal/h) = 2. GCV of fuel ( kcal / kg ) Fuel consumption rate ( kg / h) What are the instruments required to measure billet temperature in a billet reheating furnace? Ans. Instruments like infrared pyrometer or optical pyrometer is used to measure billet temperature in a billet reheating furnace. 3. List any five factors which affect the performance of furnace Ans. a b Insufficient draft c Use of inefficient burner d High stack loss e 4. Lower capacity utilisation of furnace Inadequate insulation What is the equation used to calculate the % of excess air in a furnace? Ans. The excess air equation is given by 5. = (%O2 x 100) / (21 %O2) What is the equation used to estimate the sensible heat loss in flue gas at furnace exit? Ans. Sensible heat loss in flue gas at furnace exit is given by the equation = m x Cp x T Where, M = Mass of flue gas in kg Cp = Specific heat of flue gas in kcal/kg/ C 4.2 - Furnaces (table format) 11

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