During a boiler trial, the following readings were noted

Chimney height = 90m

Feed water = 1400 kg/hr

Temperature of feed water = 30ºC

Boiler working pressure of dry & saturated steam = 20 bar

Coal used = 200 kg/hr

Calorific value of coal = 28000 kJ/kg

Flue gas temp. in chimney = 300ºC

Flue gas formed = 18 kg/kg of coal burnt

Ambient temp. = 32ºC

Cp of products of combination = 1.028 Kj/Kg.K

Find i) Thermal efficiency. ii) Equivalent evaporation. iii) Heat carried away by flue gases.

Subject : Thermal and Fluid Power Engineering

Topic : Steam Generator

Difficulty : High

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