A boiler with superheater generates 6000 kg/h of steam at 1.5 MPa, 0.98 dry at exit...

 

Transcribed Image Text:

A boiler with superheater generates 6000 kg/h of steam at 1.5 MPa, 0.98 dry at exit from the boiler and at a temp of 300 °C on leaving the superheater. If the feed water temp is 80 °C and the overall efficiency combined boiler and superheater is 85% Find. a - the amount of coal of HHV=30000 kJ/kg used per hour. b- the equivalent evaporation from and at 100 °C for the combined unit. c- the heating surface required in the superheater if the heat transmission may be taken as 450000 kJ/m? of heating surface per hour. A boiler with superheater generates 6000 kg/h of steam at 1.5 MPa, 0.98 dry at exit from the boiler and at a temp of 300 °C on leaving the superheater. If the feed water temp is 80 °C and the overall efficiency combined boiler and superheater is 85% Find. a - the amount of coal of HHV=30000 kJ/kg used per hour. b- the equivalent evaporation from and at 100 °C for the combined unit. c- the heating surface required in the superheater if the heat transmission may be taken as 450000 kJ/m? of heating surface per hour.

Answer rating: 100% (QA)

m 6000 kgh Boiler exit State 2 15 MPa x 098 hf 84456 kJkg from saturated pressure table hg ... View the full answer