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Influence of the Air Preheat Temperature and the Fuel Preheat Temperature in the Adiabatic Flame Temperature for Gaseous Fuels of Low Heating Value

[+] Author Affiliations
A. Tourlidakis, A. Malkogianni

University of Western Macedonia, Kozani, Greece

Paper No. GT2012-69977, pp. 711-719; 9 pages
doi:10.1115/GT2012-69977
From:
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4467-0
  • Copyright © 2012 by ASME

abstract

Adiabatic flame temperature is of significant importance for the design of a GT combustor, as it is the temperature under the condition of no heat loss takes place from the combustion system. This importance arises from the fact that it plays an important role in the pollutants emitted from the system, such as carbon oxides and nitrogen oxides. Additionally, the temperature also affect the thermal stresses set up in the combustion system, such stress may lead to the deterioration of the chamber if not well controlled. Consequently, it is essential before the construction of the combustion chamber, a simulation process for the temperature distribution within the combustion system to be carried out, in order to avoid local thermal stresses and to minimize nitrogen oxides and carbon dioxides emissions, pollutants of great concern, that are very dependent on the flame temperature. The factors that predominantly affect the adiabatic flame temperature are the fuel heating value, the type of oxidant, FAR, the temperature of the reactants, the amount of oxygen in the air, as well as the dissociation phenomena. In this study, a code in FORTRAN programming language is developed for the calculation of the adiabatic flame temperature. The simulation is performed for different gaseous fuels of low calorific value, for air preheat, for fuel preheat, as well as for various Φ.

From the simulation resulted that Tad and Φ for each fuel are totally dependent on the fuel’s calorific value. Both for the case of the air preheat, and the fuel preheat temperature it was observed increase of the Tad. Preheating of combustible mixture by recycling heat from flue gases has been considered an effective technology not only for combustion of low calorific fuels but also for fuel conservation.

Copyright © 2012 by ASME

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