Influence of probe sampling on reacting species measurement in diluted combustion

Lupant, Delphine; Pesenti, Barbara; Lybaert, Paul

doi:10.1016/j.expthermflusci.2009.11.004

Cited by 11 publications

(7 citation statements)

References 4 publications

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“…Gas sampling and subsequent analyses are necessary for measuring the chemical composition of the reactive mixture in combustion processes. One of the important factors to consider in obtaining accurate measurements is the design of the probe.. For instance, probes have been specially designed with a supersonic expansion and helium dilution for sampling the gas of aircraft engines exhaust 1 or with a specific orifice design in a 30 kW laboratory scale furnace 2 . Stainless water-cooled probes are also used for probing the gas sample in small scale combustors, for example in Costa's group for studying mild combustion 3 and flameless combustion 4 .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, probes have been specially designed with a supersonic expansion and helium dilution for sampling the gas of aircraft engine exhaust 1 or with a specific orifice design in a 30 kW laboratory-scale furnace. 2 Stainless watercooled probes are also used for probing the gas sample in small-scale combustors, for example in Costa's group for studying mild combustion 3 and flameless combustion. 4 Species profiles are currently measured after sampling gases in laboratory-scale burners by either molecular-beam mass spectrometry (MBMS) through cone probes or macroprobes or gas chromatography (GC) or mass spectrometry (MS) through microprobes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In Situ Laser-Induced Fluorescence and Ex Situ Cavity Ring-Down Spectroscopy Applied to NO Measurement in Flames: Microprobe Perturbation and Absolute Quantification

Lamoureux

Desgroux

2021

Energy Fuels

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Laser-Induced Fluorescence and Ex Situ Cavity Ring-Down Spectroscopy Applied to NO Measurement in Flames: Microprobe Perturbation and Absolute Quantification

Lamoureux

Desgroux

2021

Energy Fuels

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“…More details regarding the experimental procedure and measurements can be found in our previous works. [19][20][21][22][23] The studied syngas composition is (by volume): 32.5%H2, 14.25%CH4, 13.25%CO, 12%CO2 and 28%N2. A flameless combustion regime was established at 30 kW of fuel power.…”

Section: Experimental Setup and Measurementmentioning

confidence: 99%

“…Main relevant features of flameless combustion as observed in the industrial context are mimicked: strong entrainment of burnt gases by the aerodynamics of high velocity reactants jets to promote highly diluted combustion, air preheated to very high temperature up to 1000°C to reproduce air preheating with regenerative burner technology and a presence of strong heat sink (cooling tubes) to simulate important radiative heat transfer from combustion to thermal charge. Combustion of natural gas with air was firstly studied [19][20][21] in the same test rig, then the gas injector was redesigned to stabilize flameless combustion of a LCV syngas, a co-product gas produced in steel industry. 22,23 Flameless combustion was then characterized with detailed in-furnace measurements of temperature and chemical species.…”

Section: Introductionmentioning

confidence: 99%

Flameless combustion of low calorific value gases, experiments, and simulations with advanced radiative heat transfer modeling

Nguyen

Domingo

et al. 2022

Physics of Fluids

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Thermal radiation is the dominant mode of heat transfer in many combustion systems, and in typical flameless furnaces, it can represent up to 80% of the total heat transfer. Accurate modeling of radiative heat transfer is, thus, crucial in the design of these large-scale combustion systems. Thermal radiation impacts the thermochemistry, thereby the energy efficiency and the temperature sensitive species prediction, such as NOx and soot. The requirement to accurately describe the spectral dependence of gaseous radiative properties of combustion products interacts with the modeling of finite rate chemistry effects and conjugates heat transfer and turbulence. Additionally, because of the multiple injection of fuels and/or oxidizers of various compositions, case-specific radiative properties' expressions are required. Along these lines, a comprehensive modeling to couple radiation and combustion in reacting flows is attempted and applied to the simulation of flameless combustion. Radiation is modeled using the spectral line-based weighted-sum-of-gray-gases approach to calculate gaseous radiative properties of combustion products using the correlation of the line-by-line spectra of H2O and CO2. The emissivity weights and absorption coefficients were optimized for a range of optical thicknesses and temperatures encountered in the considered furnace. Efforts were also made on the development of a reliable and detailed experimental dataset for validation. Measurements are performed in a low calorific value syngas furnace operating under flameless combustion. This test rig features a thermal charge which can extract about 60% of combustion heat release via 80% of radiative heat transfer, making it of special interest for modeling validation. The comparison between the simulation and the experiment demonstrated a fair prediction of heat transfer, energy balance, temperature, and chemical species fields.

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“…MILD combustion has recently been under investigation on a Jet-in-hot coflow setup, − lab-scale furnace, − and semi-industrial furnaces. , Numerically, the eddy dissipation concept model is often applied for modeling MILD combustion in chambers and furnaces. , A recent study by Huang et al have revealed that when air and fuel are introduced in the parallel direction, the exhaust emissions are reduced. They have introduced four different configurations for the combinations of air and fuel jets based on the effect of the flow field on MILD combustion.…”

Section: Type Of Flamementioning

confidence: 99%

Review of Novel Combustion Techniques for Clean Power Production in Gas Turbines

2018

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The tremendous increase in energy demand due to increased population and rapid economics results in an increased level of atmospheric pollutants and global warming. The global shift to the use of renewable clean energies still has some restrictions in terms of the availability of the advanced reliable technologies and the cost of application compared to conventional fossil fuels. Until we can have this full conversion to renewables, the development of novel techniques for clean combustion of fossil fuels is appreciated. Forced by the simultaneous increased pressure of strict emissions regulations and the target of limiting the global warming to 2 °C, gas turbine manufacturers developed novel combustion techniques for clean power production in gas turbines as per the present review study. These novel techniques depend either on modification in the existing combustion system or developing novel burners for clean power production. In this review, different clean combustion techniques are presented including flame type variability, burner design, and fuel and oxidizer flexibility. The combustion and emission characteristics of different flame types including non-premixed/premixed, moderate or intense low-oxygen dilution (MILD) flameless combustion, colorless distributed combustion (CDC), and low-swirl injector (LSI) combustion flames are presented with their limitations for applications. Novel burner designs for clean burning in gas turbines are investigated in detail including swirl stabilized, dry low NOx (DLN), and dry low emission (DLE), catalytic combustion, perforated plate, environmental vortex (EV), sequential environmental vortex (SEV), advanced environmental vortex (AEV), and lean direct injection (LDI) micromixer burners. As an effective technique to control combustion instabilities within the gas turbine combustor, a fuel flexibility approach is studied, considering mainly hydrogen-enriched combustion and the associated concerns about the fuel variability technique. An oxidizer flexibility approach in gas turbines is also studied under a premixed combustion mode considering lean premixed (LPM) air combustion and oxy-fuel combustion, and both techniques are compared in terms of performance and emissions. Finally, the feasibility of the different clean combustion techniques is discussed along with the available market products utilizing such novel technologies.

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Influence of probe sampling on reacting species measurement in diluted combustion

Cited by 11 publications

References 4 publications

In Situ Laser-Induced Fluorescence and Ex Situ Cavity Ring-Down Spectroscopy Applied to NO Measurement in Flames: Microprobe Perturbation and Absolute Quantification

In Situ Laser-Induced Fluorescence and Ex Situ Cavity Ring-Down Spectroscopy Applied to NO Measurement in Flames: Microprobe Perturbation and Absolute Quantification

Flameless combustion of low calorific value gases, experiments, and simulations with advanced radiative heat transfer modeling

Review of Novel Combustion Techniques for Clean Power Production in Gas Turbines

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