1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Boiler efficiency and fuel consumption

  1. May 1, 2012 #1
    1. The problem statement, all variables and given/known data
    A boiler is to produce 6250 kg/h of steam superheated by 40 oC at a pressure of 2.1 MN/m2. The temperature of the feedwater is 50 oC. If the thermal efficiency of the boiler is 70%, how much fuel oil will be consumed in one hour? The calorific value of the fuel oil used is 45000 kJ/kg, cp of superheated steam is 2.093 kJ/kg K.

    for pressure 2.1 Mn/m2
    Hfg = 1880 kJ/kg
    Hf = 920 kj/KG
    sat temp - 214.9

    2. Relevant equations
    I want to know how to calculate the enthalpy of the feed water to put back into the boiler efficiency question.
    why am i given cp?

    3. The attempt at a solution
    using the formula : boiler efficiency = m x (H2-H1) / fuel consumption x calorific value

    H1 is the feed water enthalpy and i am told not to use thermodynamic tables

    I got some help from a university lecturer and solved it.
     
    Last edited: May 1, 2012
  2. jcsd
  3. Nov 29, 2015 #2
    how did you solve this?
     
  4. Nov 29, 2015 #3

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    The OP posted this problem 3 and a half years ago and never was seen again. I don't think you're going to get a response. :frown:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Boiler efficiency and fuel consumption
  1. Pump Power Consumption (Replies: 6)

Loading...