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Oxygen-Enhanced Turbulent Non-Premixed Swirling Methane Flames for CO2 Capture Applications

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HAL Id: hal-02019476

https://hal.archives-ouvertes.fr/hal-02019476

Submitted on 14 Feb 2019

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Oxygen-Enhanced Turbulent Non-Premixed Swirling

Methane Flames for CO2 Capture Applications

N Merlo, T. Boushaki, C Chauveau, S. de Persis, I. Gökalp

To cite this version:

N Merlo, T. Boushaki, C Chauveau, S. de Persis, I. Gökalp. Oxygen-Enhanced Turbulent Non-Premixed Swirling Methane Flames for CO2 Capture Applications. Joint Meeting : French and Italian Sections - IFRF and the Combustion Institute, Apr 2014, Pisa, Italy. �10.4405/profic2014.C24�. �hal-02019476�

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Joint Meeting: French and Italian Sections – IFRF and The Combustion Institute

OXYGEN-ENHANCED TURBULENT

NON-PREMIXED SWIRLING METHANE FLAMES

FOR CO

2

CAPTURE APPLICATIONS

N. Merlo, T. Boushaki, C. Chauveau, S. De Persis, İ. Gökalp nazim.merlo@cnrs-orleans.fr

ICARE CNRS, 1C av. de la Recherche Scientifique 45000 Orléans, France

CO2 emissions remain the main greenhouse gas reduction targets in the industrial sector for

the EU. The CO2-Energicapt project aims to demonstrate the feasibility of CO2 capture by

coupling CO2 capture technologies and oxygen enrichment systems. A pilot plant on a

small scale is built to demonstrate the efficiency of a membrane based CO2 capture

technology integrated to an existing District Heating Plant in the Paris region.

This presentation focuses on the combustion part of the CO2-Energicapt project involving a specific burner technology, operating in partially premixed mode, well suited for oxygen-enhanced combustion. The combustion characteristics of methane oxygen-enriched air turbulent non-premixed swirling flames are presented. The main results concern the flame stability maps, NOx, CO2 and CO emissions, and flame dynamics for different oxygen

addition rates. The exhaust gas compositions are measured using gas analysers. Stereoscopic Particle Image Velocimetry (Stereo PIV) is used to analyse the dynamics of swirling flows in non-reacting and reacting conditions. The measurements are performed for oxygen concentrations ranging from 21 % to 30 % by volume, with swirl numbers from 0.8 to 1.4 and global equivalence ratios from 0.8 to 1.

The Stereo PIV results (Fig.1) in the center plane and the transverse plane of the swirling jet illustrate the interactions between flame and large-scale vortices. Swirling rates, as well as the entrainment rates, are also quantified based on measured velocity distributions close to the burner exit in non-reacting and reacting conditions. The results show various flame types from purely diffusion flames (Fig.1b) to partially premixed ones depending on the fuel and oxidizer flow rates. Increasing the swirl number and the oxygen addition rate significantly improve the flame stability. The results demonstrate that the CO2 emissions in

the exhaust gases linearly increase with increasing O2 content in the oxidizer. The CO

emissions are shown to decay exponentially, whereas the NOx emissions, mainly produced

through the thermal pathway, increase strongly with oxygen enrichment. Work is continuing to optimise the emissions namely to reduce NOx emissions.

Fig.1 Field of axial velocity U (a) (Sn = 0.8 and Ф = 0.8) and flame images (b,c,d,e,f).

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