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

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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