8. The foilowing observations were made during the trial of a boiler plant consisting of a battery of lancashire boilers and an economiser: Calorific value of coal per kg 30MJ/kg; Mass of feed water per kg of dry coal=9.1 kg; Equivalen %3D evaporation from and at 100" C per kg of dry coal = 9.6 kg; Temperature of feed water to economiser = 12" C Temperature of feed water to boiler= 105° C; Air temperature 13° C; Temperature of flue gases entering economiser = 370° C; Mass of flue gases entering economiser = 18.2 kg/kg of coal; Mean specific heat of flue gases = 1.005 kJ/kg K. %3D %3D
8. The foilowing observations were made during the trial of a boiler plant consisting of a battery of lancashire boilers and an economiser: Calorific value of coal per kg 30MJ/kg; Mass of feed water per kg of dry coal=9.1 kg; Equivalen %3D evaporation from and at 100" C per kg of dry coal = 9.6 kg; Temperature of feed water to economiser = 12" C Temperature of feed water to boiler= 105° C; Air temperature 13° C; Temperature of flue gases entering economiser = 370° C; Mass of flue gases entering economiser = 18.2 kg/kg of coal; Mean specific heat of flue gases = 1.005 kJ/kg K. %3D %3D
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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Transcribed Image Text:8. The foilowing observations were made during the trial of a boiler plant consisting of a battery of 6
lancashire boilers and an economiser:
Calorific value of coal per kg= 30MJ/kg; Mass of feed water per kg of dry coal 9.1 kg; Equivalent
evaporation from and at 100" C per kg of dry coal = 9.6 kg; Temperature of feed water to economiser 12" C:
Temperature of feed water to boiler 105° C; Air temperature 13° C ; Temperature of flue gases entering
economiser 370° C; Mass of flue gases entering economiser 18.2 kgkg of coal; Mean specific heat of flue
gases = 1.005 kJ/kg K.
%3D
Find : 1. the cfficiency of the boiler alone; 2. the efficiency of the economiser alone ; and 3. the
[Ans. 72.22% ; 54.43%; 84.1%l
efficiency of the whole boiler plant.
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