Stuck with this question:
A coal fired steam plant takes in feed water at a temp. of 80C and produces 12.5 tonnes of steam per hour at a pressure of 60 bar and a temp of 400C. The input power to the boiler can be derived from the following information:
Fuel consumption rate is 1.25 tonnes per hour.
Calorific value of the fuel is 36MJ/kg.
Determine the power rating of the boiler and it’s thermal efficiency.
(if anybody can help me with this it would be a great help, any working out helps me understand it more thanks)
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you need to see the steam tables, i found the enthalpies online
Efficiency= Msteam (hsteam- hfeedwater) / (Mfuel * CVfuel )
= [12.5 ( 3177- 335)] / (1.25* 36*1000)
= 78.9 %
Power rating = 12.5 *1000* (3177-335) = 35525 MJ/h
= 35525/3600 = 9.86 MW