Determination of temperature and water-concentration in fuel-rich oxy-fuel methane flames applying TDLAS

Sentko, M.; Schulz, Sebastian; Stelzner, Björn; Anderlohr, C.; Vicari, M.; Trimis, D.

doi:10.1016/j.combustflame.2020.01.003

Cited by 26 publications

(8 citation statements)

References 36 publications

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“…Two DFB diode lasers (NanoPlus GmbH) with central wavelengths λ cw = 1344.5 nm and λ cw = 1392.3 nm were used for this purpose. The experimental setup, selection of suitable absorption lines, characterization of the diode laser, data analysis and determination of experimental uncertainties for the determination of temperature and water concentration are described in detail in [19].…”

Section: Tdlasmentioning

confidence: 99%

“…Both were considered for the determination of temperature and water concentration. as described in detail in [19]. For the calculation of the experimental uncertainties of temperature and H 2 O concentration, the uncertainties of the used databases (HITRAN [23] and HITEMP [24]) and the fitting and analyzing procedure of the experimentally measured absorption peaks were considered.…”

Section: Tdlasmentioning

confidence: 99%

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Experimental Characterization of Flame Structure and Soot Volume Fraction of Premixed Kerosene Jet A-1 and Surrogate Flames

et al. 2021

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Modeling the chemical reactions and soot processes in kerosene flames is important to support the design of future generations of low-emission aircraft engines. To develop and validate these models, detailed experimental data from model flames with well-defined boundary conditions are needed. Currently, only few data from experiments with real aircraft engine fuels are available. This paper presents measurements of temperature, species and soot volume fraction profiles in premixed, flat flames using Jet A-1 kerosene and a two-component surrogate blend. Measurements were performed using a combination of TDLAS, GC and laser extinction. The results show that the flame structure in terms of temperature and species profiles of the kerosene and surrogate flames are very similar but differ greatly in the resulting soot volume fractions. Furthermore, the study shows that the available chemical mechanisms can correctly predict the temperature profiles of the flames but show significant differences from the experimentally observed species profiles. The differences in the sooting tendency of the kerosene and the surrogate are further investigated using detailed chemical mechanisms.

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Section: Tdlasmentioning

confidence: 99%

Section: Tdlasmentioning

confidence: 99%

Experimental Characterization of Flame Structure and Soot Volume Fraction of Premixed Kerosene Jet A-1 and Surrogate Flames

et al. 2021

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“…It is essential to control O 2 concentrations in the flue gas for both scale formation and fuel economy. Tunable diode laser spectroscopy (TDLS (Yokogawa TDL200)) was used to control O 2 concentrations in the flue gas for the test furnace with feedback control. − From Figure , the O 2 concentrations in the flue gas are well maintained with feedback control, whereas it has big fluctuations without feedback control. Thus, it is better to apply TDLS to obtain a more precise O 2 concentration control in the flue gas in real time when 25% of enriched O 2 -lancing was applied to the heavy plate furnace.…”

Section: Resultsmentioning

confidence: 99%

Combustion Using Oxygen-Lancing in a Reheating Furnace

2021

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Fuel economy has been a primary issue in the steel industry because it uses large amounts of energy, such as the gaseous fuel of byproduct gas. Furthermore, reheating throughput capacity has been a key issue because it can improve furnace efficiency, leading to fuel economy. Many attempts have tried improving fuel economy using oxygen in a reheating furnace. Oxygen-lancing technology was developed to increase fuel economy and maintain the same level of NO x concentration simultaneously. Mechanisms that inject oxygen into flames locally causing flame quenching and at the same time suppressing the increase in NO x concentration due to recirculation of reheating furnace-burned gases are key to this study. Various oxygen concentrations for its lancing were used to investigate its effects on furnace temperature and NO x concentration in a test furnace. It was determined that 30% of oxygen was optimal regarding fuel economy and NO x concentrations. Oxygen was injected into the flame using two lancing pipes at 11° in a design capacity of 125 MW. The results showed a 3–5% increase in fuel economy and the same level of NO x concentration in the furnace.

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“…The traditional spectral processing method is to fit the whole spectrum profile, [3][4][5] so it is difficult to apply to the absorption saturation incomplete spectrum under optically thick conditions. Although some research groups have worked on extending the dynamic range of laser absorption spectroscopy techniques, [6][7][8][9] but these techniques or methods are only suitable for optical thin limit.…”

Section: Introductionmentioning

confidence: 99%

Methods of tunable diode laser absorption saturation spectroscopy to gas sensing under optically thick conditions

Nie

Rao

et al. 2021

Micro & Optical Tech Letters

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The absorption saturation under optically thick conditions will bring difficulties to laser spectroscopy gas sensing. We report the spectrum two wings reconstruction method and the transmitted laser intensity fitting method for tunable diode laser absorption saturation spectroscopy gas absolute measurements under optically thick conditions, and used the modified Lambert Beer's law to calculate methane concentration based on the incomplete spectrum of absorption saturation. The maximum deviation between the experimental measurement results and the standard methane concentration is about 4.7%, which verifies the feasibility of these new methods and also show that they have great potential for expanding the gas sensing range of a single absorption line.

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Determination of temperature and water-concentration in fuel-rich oxy-fuel methane flames applying TDLAS

Cited by 26 publications

References 36 publications

Experimental Characterization of Flame Structure and Soot Volume Fraction of Premixed Kerosene Jet A-1 and Surrogate Flames

Experimental Characterization of Flame Structure and Soot Volume Fraction of Premixed Kerosene Jet A-1 and Surrogate Flames

Combustion Using Oxygen-Lancing in a Reheating Furnace

Methods of tunable diode laser absorption saturation spectroscopy to gas sensing under optically thick conditions

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