Boiler Operation Engineer

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8. Calculate height of Chimney to produce a draught of 16 mm of water column when the temp. of the flue gases in the chimney is 317°c and boiler room temp. is 38° C and suppiy quantity of air is 18 kg. per kg. of fuel.

7. During an air pollution monitoring study, the inlet gas stream to a bag filter was 150000 m3/hr. The outlet stream from the bag filter was a little bit higher at 160000 m3/hr. Dust load at the inlet was 7 gm/m3 and at the outlet 0.2 gm/m3 How much dust in kg/hr was collected in the bag filter bin.

6. A boiler drum of total weight 23500 kg is supported by four ropes. Find the diameter of ropes if allowable stress for rope meterial is 800 kg/cm2.

5. Steam with a dryness fraction of 0.9 at 8 kg/cm2(ab) passes through a reducing valve to a pressure of 3kg/cm2(ab). What is the dryness fraction of the steam at downstream of the valve?

4. A vertical oil tank of cylindrical shape has radius 0.5 m and height 0.9m. Find the capacity of the cylindrical tank in litres. If tank is having 6mm thick, calculate outer surface area of tank. Assume top of tank is open to atmosphere and bottom is closed.

3. Efficiency of a 300 TPH Coal fired boiler is 84%. Calculate quantity of coal required per day if the boiler runs in full load. Consider feed water temperature 140°C and GCV of coal 3600 Kcal/kg and enthalpy of final superheated steam is 803 kcal/kg.

2. 1500 Tons of coal having 46% Ash is used in a boiler in a particular day. 20% of the ash generated is drained from boiler as bottom ash. Rest of the ash is fly ash. Calculate fly ash generation on that particular day.

1. Efficiency of a 110 TPH, 80 kglcm2 (ab), 520° C. boiler is 81 % Calculate quantity of coal required Per hr, if feed water inlet temperature is 125 oC. Make up water is almost nil. GCV of coal used is 3650 kCal/kg. Calculate evaporation ratio of the boiler.