Input/loss method for determining boiler efficiency of a fossil-fired system

  • US 6,584,429 B1
  • Filed: 08/02/2000
  • Issued: 06/24/2003
  • Est. Priority Date: 08/06/1999
  • Status: Expired due to Term
First Claim
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1. A method for determining a higher heating value boiler efficiency for a thermal system which applies consistently a fuel'"'"'s calorimetric temperature, comprising the steps of:

  • (a) determining a fuel'"'"'s higher heating value and the associated calorimetric temperature;

    (b) equating a thermodynamic reference temperature used to evaluate a boiler'"'"'s energy flows, to the calorimetric temperature as established when determining the fuel'"'"'s higher heating value;

    (c) calculating an Enthalpy of Products, an Enthalpy of Reactants and a Firing Correction as a function of the fuel'"'"'s higher heating value, common system parameters, and the thermodynamic reference temperature;

    (d) calculating the combustion efficiency as a function of the higher heating value, the Enthalpy of Products, the Enthalpy of Reactants, and the Firing Correction;

    (e) calculating a boiler efficiency from the combustion efficiency and a boiler absorption efficiency;

    (f) calculating a fuel flow to the thermal system from the boiler efficiency, an energy delivered from the combustion process, the fuel'"'"'s higher heating value and the Firing Correction; and

    (g) calculating an effluent flow output from the thermal system from the fuel flow and system stoichiometrics.

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