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Please Help me with my (ThermoFluid Project)

  1. Nov 22, 2007 #1
    Problem Statement​


    A GT power station has a peak demand on electrical power of 190 MW. The Turbine-Generator conversion efficiency is 95 percent. A heat recovery Heat Exchanger is to be installed to recover some of the heat from the exhaust gases, before they are purged to the atmosphere. The fuel used is Natural Gas with a heating value of about 47 MJ/kg. Be aware that 40% excess air is to be introduced to the combustion chamber. Moreover, the stoichiometric Air/Fuel ratio (on mass basis) for this fuel is about 17.

    TASKS:
    1. Decide the components that you want to include in your system; (just simple cycle or with regeneration; justify your selection based on quantitative results).
    2. Decide the maximum operating temperature; your judgment should be justified.
    3. Investigate the performance (thermal efficiency of the system under different compression ratios and the fuel flow rate) under different compression ratio conditions.
    4. Make necessary sizing analysis for the regenerator (in case you decided to include a regenerator). Choose a counter flow heat exchanger type for the regenerator.
    5. Make necessary sizing analysis for the Heat recovery heat exchanger; choose it to be of the compact-cross flow type heat exchanger with fins on the tubes from the outer side (the hot side of the hot exhaust gases). This Heat Recovery Heat Exchanger is to be installed at the base of the exhaust chimney.

    6. Determine the destructed Exergy of the system at different compression ratio conditions.

    7. Your final selection of the optimum operating conditions should not only be based on efficiency, but exergy analysis, as well.

    8. The final sizing of the designed Heat Exchangers should be based on the operating conditions of the optimum operation selected in item 7 above.

    NOTES:
    • for simplicity, you can start your design analysis using the cold air standard assumption for the gas side, but when you make the final design the effect of varying temperatures on the specific heats should be taken into consideration.
    • The limit on the maximum amount of heat recovery (i.e. the minimum exhaust gas temperature after the Heat Recovery Heat Exchanger) should take the dew point temperature of the steam in the exhaust gases into consideration.
    =================================================


    can any one help me on this project please ?
     
  2. jcsd
  3. Nov 24, 2007 #2
    Hi there:

    Check out the following URL where you can find some useful material and calculators on the subject matter:

    http://engware.i-dentity.com

    Thanks,

    Gordan
     
  4. Nov 25, 2007 #3
    Thanks for the URL and for your attempt to help me out. I visited the link but can find slideshows and calculations i hope if someone can help me solve this problem or send me a URL of a forum where i can benifit from thanks a lot all.
     
  5. Nov 29, 2007 #4
    Ok saying that the

    efficiency = W(net) / Q

    Q = W(net) / Efficiency

    Q = 190/0.95 = 200 MW


    or saying that

    efficiency = output/input

    input = output / efficency

    Input = 190 / 0.95 =200 MW

    Ok how do i proceed then ?


    How do i benifit from ("for simplicity, you can start your design analysis using the cold air standard assumption for the gas side, but when you make the final design the effect of varying temperatures on the specific heats should be taken into consideration.")
     
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