TUTORIAL SHEET - 31- How much is used/kg of coal burnt in a boiler having chimney of 35 mheight to create a draught of 20 mm of water, when the temperature of fluegas in the chimney is 370°C and the boiler house temperature is 34°C. Doesthis chimney satisfy the condition of maximum discharge?Answers: 18.683 kg of air/kg of coal, W = 21.1722- Calculate the mass of flue gases flowing through the chimney whendraught produced is equal to 1.9 cm of water. Temperature of flue gases is290° C and the ambient temperature is 20° C. The flue gases formed per kgof fuel burnt are 23 kg. Neglect the losses and take the diameter of chimneyas 1.8 m.Answers: H= 34.67 m , H1 == 29.05 m of air, mg = 39.8 kg/s3- A boiler generates 2400 kg of dry steam per hour at a pressure of 11 barthe grate area is 3 m2, and 90 kg of coal is burnt per m2 of grate area perhour. The calorific value of coal is 33180 kJ/kg and the temperature of feedwater is 17.5° C. Determine (i) Actual evaporation per kg of coal(ii) Equivalent evaporation from and at 100° C (iii) efficiency of the boiler.Answers: 8.889 kg/kg of fuel, 10.659 kg/kg of coal, 86.93%

Given, H=35 m h=20 mm of water Tg=370 0C=370+273 K=643 K Ta=34 0C=34+273 K=307 K

1- How much is used/kg of coal burnt in a boiler having chimney of 35 m height to create a draught of 20 mm of water, when the temperature of flue gas in the chimney is 370°C and the boiler house temperature is 34°C. Does this chimney satisfy the condition of maximum discharge? Answers: 18.683 kg of air/kg of coal, W =21.172

1- How much is used/kg of coal burnt in a boiler having chimney of 35 m height to create a draught of 20 mm of water, when the temperature of flue gas in the chimney is 370°C and the boiler house temperature is 34°C. Does this chimney satisfy the condition of maximum discharge? Answers: 18.683 kg of air/kg of coal, W =21.172

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 8.29P

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A saturated steam at 410K is being transported in a pipeline (brass drawing tubing) at a rate of 1 grams/second. Pipe has inside diameter of 0.025 m . The tube is 100m long. The pressure at the entrance is 80kPa. (use Perry's Handbook for the properties and constants) R = 8314J/kgmol.K; MW=18.02g/mol What is the a.) value of G in kg/s.m2? b.)value of friction factor? 3 significant figures c.)the % of pressure drop? d.)the outlet pressure? e.) compressible or not?
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Problem -1 ) A boiler has chimney of 35 m height to produce natural draught of 10 mm of water column. Ambient air temperature is 25 °C and boiler furnace requires 15 kg of air per kg of fuel for complete combustion. Determine minimum temperature of burnt gases leaving chimney.
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