A boiler delivers steam at 100 bar and 500 C. the feed water inlet temperature is 160 C. the steam is produced at the rate of 100 tonnes/h and the boiler efficiency is 88%. Estimate the fuel burning rate in kg/h if the calorific value of the fuel is 21MJ/kg

Refrigeration and Air Conditioning Technology (MindTap Course List)
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Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
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Chapter50: Commercial, Packaged Rooftop, Variable Refrigerant Flow, And Variable Air Volume Systems
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A boiler delivers steam at 100 bar and 500 C. the feed water inlet temperature is 160 C. the steam is produced at the rate of 100 tonnes/h and the boiler efficiency is 88%. Estimate the fuel burning rate in kg/h if the calorific value of the fuel is 21MJ/kg

6 In a boiler test, the following observations wcre made:
358
A Text Book of Thermal Engineering
Feed water temperaturç
e=
12" C; Pressure of steam = 11 bar; Dryness fraction of steam 095
Mass of coal burnt 300 kg/h, Calorific value of coal 32 000 kJkg of coal; Mass of water supplied to boiler
in 7 hrs 14 min= 14 625 kg.
The mass of w ster in the boiler at the end of the test was less than that at the commencement by
900kg. Calculate I. Actual evaporation per kg of coal: 2 Equivalent evaporation from and at 100 C per kg
[Ans. 7 15 kg, 8 33 kg: 58.75 %
of coal ; and 3. Thermal efficiency of the boiler
Transcribed Image Text:6 In a boiler test, the following observations wcre made: 358 A Text Book of Thermal Engineering Feed water temperaturç e= 12" C; Pressure of steam = 11 bar; Dryness fraction of steam 095 Mass of coal burnt 300 kg/h, Calorific value of coal 32 000 kJkg of coal; Mass of water supplied to boiler in 7 hrs 14 min= 14 625 kg. The mass of w ster in the boiler at the end of the test was less than that at the commencement by 900kg. Calculate I. Actual evaporation per kg of coal: 2 Equivalent evaporation from and at 100 C per kg [Ans. 7 15 kg, 8 33 kg: 58.75 % of coal ; and 3. Thermal efficiency of the boiler
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