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Posted by Pete on August 10, 2002 at 11:59:25:
In Reply to: will some give me answer of this question posted by suzi on August 10, 2002 at 10:45:43:
What is your boiler operating pressure? What is your final steam temperature (if you have superheaters).
What grade of fuel oil?
All you then need to know is the heating values of the fuel and you can find how much heat needs to be added to your boiler. Using any steam tables, look up how much enthalpy needs to be added to your feedwater and steam to raise it to operating pressure and temperature. This will include sensible heat added to feedwater, latent heat of evaporation added to steam, and any superheat added to raise steam temperature. Once you know this total enthalpy per unit mass, divide by thermal efficiency to get total heat to be added to boiler/unit mass of steam produced. Once you have this number you can easily calculate the amount (mass or volume) of fuel needed/unit mass of steam if you have the higher heating values. These can be found in any reference book. It is then simply a matter of mulipling by your steaming rate to determine fuel input needed to boiler.