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Steam plant question.

  1. Jan 25, 2015 #1
    Im attempting this question for an evening class im attending. hope im posting in the right place. I'm not sure where I have gone wrong think its where I rearranged my formula to find steam output.

    Question attached below
     

    Attached Files:

  2. jcsd
  3. Jan 25, 2015 #2
    The work is a bit unclear. I'll get back to you in a day or so.
     
  4. Jan 25, 2015 #3
    Ok Thanks
     
  5. Jan 25, 2015 #4
    I think I calculated the steam output wrong, I have the over all efficiently of the system 77%, what formula do I use the calculate steam output?



    Q=M(h2-h1)
     
  6. Jan 25, 2015 #5
    Yeah that's the one..!
    For calculating the steam output, you can directly use the 77% efficiency without involving the economizer and super heater (if I'm not wrong).
    So 77% of the heat obtained from the combustion of coal is used to convert water to steam.
     
  7. Jan 25, 2015 #6
    77% is the overall efficiency am I right ? So did I divide .77 by h2-h1 to get steam output?
     
  8. Jan 26, 2015 #7
    Yes! And equate it with the energy provided by the combustion of coal. Tell me if that gives the right answer.
     
  9. Jan 26, 2015 #8
    6244.09 kg/h
     
  10. Jan 26, 2015 #9
    I meant did you get the right answer?
     
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