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Research Papers: Power Engineering

High-Temperature Air Combustion Phenomena and Its Thermodynamics

[+] Author and Article Information
Nabil Rafidi

KTH,  Royal Institute of Technology, 10044 Stockholm, Swedenrafidi@kth.se

Wlodzimierz Blasiak

KTH,  Royal Institute of Technology, 10044 Stockholm, Swedenblasiak@mse.kth.se

Ashwani K. Gupta

Department of Mechanical Engineering,  University of Maryland, College Park, MD 20742akgupta@eng.umd.edu

J. Eng. Gas Turbines Power 130(2), 023001 (Jan 22, 2008) (8 pages) doi:10.1115/1.2795757 History: Received September 30, 2005; Revised July 15, 2006; Published January 22, 2008

The fundamentals and thermodynamic analysis of high-temperature air combustion (HiTAC) technology is presented. The HiTAC is characterized by high temperature of combustion air having low oxygen concentration. This study provides a theoretical analysis of HiTAC process from the thermodynamic point of view. The results demonstrate the possibilities of reducing thermodynamic irreversibility of combustion by considering an oxygen-deficient combustion process that utilizes both gas and heat recirculations. HiTAC conditions reduce irreversibility. Furthermore, combustion with the use of oxygen (in place of air) is also analyzed. The results showed that a system, which utilizes oxygen as an oxidizer, results in higher first and second law efficiencies as compared to the case with air as the oxidizer. The entropy generation for an adiabatic combustion process is reduced by more than 60% due to the effect of either preheating or oxygen enrichment. This study is aimed at providing technical guidance to further improve efficiency of a combustion process, which shows very small temperature increases due to mild chemical reactions.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

A schematic diagram of flame and heat flux distribution in a furnace with low-temperature combustion air (left), high-temperature air (middle), and high-temperature and low oxygen concentration combustion air (HiTAC) condition (right)

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Figure 2

Fuel jet impingement into a cross flow of normal temperature air (left) and high-temperature air (right)

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Figure 3

The oxygen-deficient system comprising three components

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Figure 4

H‐T diagram for C3H8∕air or O2 mixture (top diagram, air; bottom diagram, O2)

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Figure 5

Effect of preheating of the reactants and oxygen enrichment on the entropy rate generation in an adiabatic isobaric combustion process

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Figure 6

Effect of dilution by flue gas recirculation on the entropy rate generation in an adiabatic isobaric combustion process

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Figure 7

Efficiency defect due to combustion as a function of equilibrated temperature of the products for various oxygen concentration levels

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Figure 8

The efficiency defect of every component of the ODC system as a function of equilibrated temperature of the product combustion gases

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Figure 9

Comparison between an ordinary combustion and various cases of ODC

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