Comparison between visible and near-IR flame spectra from natural gas-fired furnace for blackbody temperature measurements

Keyvan, Shahla; Rossow, Rodney; Romero, Carlos E.; Li, Xian Chang

doi:10.1016/j.fuel.2003.12.002

Cited by 20 publications

(13 citation statements)

References 11 publications

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“…The actual intensity of the object will then be calibrated by dividing the measured intensity at λ i by C i from Figure 4. The detailed procedure refers to the publication by Keyvana et al 19 3. RESULTS AND DISCUSSION 3.1.…”

Section: Optical Measurement Methodmentioning

confidence: 99%

Distribution Characteristics of OH, CH, and C₂* Luminescence in CH₄/O₂ Co-flow Diffusion Flames

et al. 2012

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Information on luminescence of the excited-state radicals is of significance for spectrometer-based diagnostics of practical diffusion flames. In this paper, the emission spectrometry was applied to detect the distribution characteristics of three excited-state radicals (OH*, CH*, and C 2 *) in CH 4 /O 2 co-flow jet diffusion flames with relatively high flow velocities (66 m/s CH 4 and 18 m/s O 2 /N 2 ), which is the basis to rationalize chemiluminescence flame diagnostics in gasification and combustion processes. This method allowed for the online measurement of luminescence intensity in flames. Results showed that there exited two peaks along the flame propagation direction for OH* when [O/C] e was greater than 0.90. The first peak formed near the nozzle exit because of the relatively high flow velocities pushing the interdiffusion of fuel and oxygen in the flame bottom, and the second peak was located near the boundary region of blue and yellow zones, indicating where the other reaction zone is. In contrast, CH* and C 2 * demonstrated only one chemiluminecent peak near the nozzle exit. OH*/CH* intensity ratio exhibited an exponential correlation with [O/C] e in the blue region, where the background spectra could be negligible, which can be regarded as the same as those found in premixed flames, and it is valuable to characterize the local [O/C] e quantitatively.

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Section: Optical Measurement Methodmentioning

confidence: 99%

Distribution Characteristics of OH, CH, and C₂* Luminescence in CH₄/O₂ Co-flow Diffusion Flames

et al. 2012

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“…8,9,10,11, and 12, the thermodynamic functions of thermal radiation of luminous flames have the following expressions: (a) Free energy:…”

Section: Luminous Flamesmentioning

confidence: 99%

“…A spectroscopic-based system for providing real-time flame temperature monitoring for natural gas-fired furnaces was developed [10,11]. The flame temperature was determined by using an intensity ratio approach for paired wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Determination of the True Temperature of Molybdenum and Luminous Flames from Generalized Wien’s Displacement and Stefan–Boltzmann’s Laws: Thermodynamics of Thermal Radiation

Fisenko¹,

Ivashov

2009

Int J Thermophys

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The true temperature of thermal radiation of molybdenum and luminous flames is defined from the temperature dependences of generalized Wien's displacement and Stefan-Boltzmann's laws. For determining the true temperature of molybdenum, experimental values of either the position of the maximum of the spectral emitted density or the total emitted density are needed. It is shown that the thermal radiation of molybdenum belongs to the same universality class as that of tantalum, tungsten, and zirconium and titanium carbides. The thermodynamic functions of thermal radiation of molybdenum and luminous flames are constructed.

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“…A CCD camera with band response is not suitable for the detection of non-gray radiation due to the loss of detailed spectral information. Therefore, the flame radiation in the previous ratio pyrometry applications was assumed to be gray [8]. Zhang et al simultaneously reconstructed the inhomogeneous temperature and radiative properties in an arch-fired boiler by radiation image…”

Section: Introductionmentioning

confidence: 99%

“…The monochromatic emissivity in the equation is corrected by the detected values of spectrometer, and then the temperature can be iterated from the implicit equation above. The flame image emissivity can be calculated from Equation (8), and it indicates the Planck-mean value in the visible spectral bands:…”

Section: Introductionmentioning

confidence: 99%

Emissivity Characteristics of Hydrocarbon Flame and Temperature Measurement by Color Image Processing

et al. 2019

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Non-gray radiation should be considered in the temperature and emissivity measurements of hydrocarbon flames. In this paper an improved ratio pyrometry by spectral analysis and color image processing is proposed. A Newton-type iterative method is utilized to analyze the spectrometer signals for the detection of monochromatic emissivity, and then the ratio pyrometry based on color image processing is corrected by the detected monochromatic emissivity without making approximations of the filter profiles of CCD camera. The experiments were conducted on a tubular heating furnace with coal gas and a propane flame. The spectral and spatial distributions of emissivity of hydrocarbon flame were detected, and the temperature measurement results at four conditions coincided with the thermocouple with relative errors less than 8.34%. The soot volume fractions in the turbulent diffusion hydrocarbon flame were approximately estimated from the detected emissivity, and are influenced by the O/C in the combustion. This study will provide a simple and effective method for the detection of non-gray radiation of hydrocarbon flames in the combustion industry.

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Comparison between visible and near-IR flame spectra from natural gas-fired furnace for blackbody temperature measurements

Cited by 20 publications

References 11 publications

Distribution Characteristics of OH, CH, and C₂* Luminescence in CH₄/O₂ Co-flow Diffusion Flames

Distribution Characteristics of OH, CH, and C₂* Luminescence in CH₄/O₂ Co-flow Diffusion Flames

Determination of the True Temperature of Molybdenum and Luminous Flames from Generalized Wien’s Displacement and Stefan–Boltzmann’s Laws: Thermodynamics of Thermal Radiation

Emissivity Characteristics of Hydrocarbon Flame and Temperature Measurement by Color Image Processing

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Comparison between visible and near-IR flame spectra from natural gas-fired furnace for blackbody temperature measurements

Cited by 20 publications

References 11 publications

Distribution Characteristics of OH*, CH*, and C2* Luminescence in CH4/O2 Co-flow Diffusion Flames

Distribution Characteristics of OH*, CH*, and C2* Luminescence in CH4/O2 Co-flow Diffusion Flames

Determination of the True Temperature of Molybdenum and Luminous Flames from Generalized Wien’s Displacement and Stefan–Boltzmann’s Laws: Thermodynamics of Thermal Radiation

Emissivity Characteristics of Hydrocarbon Flame and Temperature Measurement by Color Image Processing

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Distribution Characteristics of OH, CH, and C₂* Luminescence in CH₄/O₂ Co-flow Diffusion Flames

Distribution Characteristics of OH, CH, and C₂* Luminescence in CH₄/O₂ Co-flow Diffusion Flames