SPECTRAL RADIATION CHARACTERISTICS OF COAL ASHES AND SLAGS

A series of combustor tests were conducted with a tubular-can combustor to study flame radiation characteristics and effects with parametric variations in combustor operating conditions. Two alternate combustor assemblies using a different fuel nozzle were compared. Spectral and total radiation detectors were positioned at three stations along the length of the combustor can. Data were obtained for a range of pressures from 0.34 to 2.07 MPa (50 to 300 psia), inlet temperatures from 533 to 700K (500 to 800°F), for Jet A (13.9% hydrogen) and ERBS (12.9% hydrogen) fuels, and with fuel-air ratios nominally from 0.008 to 0.021. Spectral radiation data, total radiant heat flux data, and liner temperature data are presented to illustrate the flame radiation characteristics and effects in the primary, secondary, and tertiary combustion zones.

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Spectral radiation characteristics in semi-coke jet flame for energy utilization

Fuel ◽

10.1016/j.fuel.2021.121194 ◽

2021 ◽

Vol 302 ◽

pp. 121194

Author(s):

Shiquan Shan ◽

Binghong Chen ◽

Zhijun Zhou ◽

Yanwei Zhang

Keyword(s):

Energy Utilization ◽

Spectral Radiation ◽

Radiation Characteristics ◽

Jet Flame

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Spectral Radiation Characteristics of Diazo Copying Mercury Lamps

JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN ◽

10.2150/jieij1917.50.9_496 ◽

1966 ◽

Vol 50 (9) ◽

pp. 496-506

Author(s):

Yasuo NAKAGAWA

Keyword(s):

Spectral Radiation ◽

Radiation Characteristics

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Arrangement structure of carbon nanofiber with excellent spectral radiation characteristics

Nanotechnology Reviews ◽

10.1515/ntrev-2020-0060 ◽

2020 ◽

Vol 9 (1) ◽

pp. 789-799

Author(s):

Jinying Yin ◽

Jiangyue Han ◽

Caihui Qi ◽

Yan Wang

Keyword(s):

Carbon Nanofibers ◽

3D Model ◽

Carbon Nanofiber ◽

Filler Content ◽

Spectral Radiation ◽

Radiation Characteristics ◽

Analytical Results ◽

Random Arrangement ◽

Spectrum Band ◽

Difference Time

AbstractTo explore the spectral radiation characteristics of carbon nanofibers, a finite-difference time-domain method has been applied to study and calculate the scattering/absorption factors of carbon nanofibers with various arrangements, while the filler contents are 61.15%, 53.81%, 48.92%, 44.03% and 39.13% in the spectrum band of 2.5–15 µm. The effects of the nanofiber content, 2D/3D random arrangement and nanofiber radius on scattering/absorption characteristics have been analyzed. The analytical results show that the spectral radiation characteristics of carbon nanofibers have been significantly increased with an increase in the filler content. When the nanofiber content reduced to 48.92%, the random arrangement structure of carbon nanofiber plays an essential role in determining the spectral radiation characteristics. Analytical results prove that the prediction accuracy has been significantly improved by 30.12% by sing the 3D random arrangement model than by using the 2D uniform arrangement model. This study proposed a 3D model to predict the spectral radiation characteristics of carbon nanofibers and their aggregates in engineering nanocomposites.

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Spectral Thermal Radiation Characteristics of Coal Ashes and Slags: Influence of Chemical Composition and Temperature

Heat Transfer: Volume 1 ◽

10.1115/ht2003-47187 ◽

2003 ◽

Cited By ~ 2

Author(s):

S. Linka ◽

S. Wirtz ◽

V. Scherer

Keyword(s):

Heat Transfer ◽

Chemical Composition ◽

Thermal Radiation ◽

Coal Ash ◽

Spectral Emissivity ◽

Department Of Energy ◽

Radiation Characteristics ◽

Transfer Rates ◽

Inorganic Species ◽

Coal Ashes

During the combustion of pulverized coal, ash particles (formed from inorganic species) can deposit on heat-transfer surfaces, resulting in a decrease in heat transfer rates and system efficiency. In addition to the knowledge of the thermal conductivity of the deposits it is necessary to obtain information on the thermal radiation characteristics of the furnace walls to predict the influence of ash sedimentation on heat transfer. At the Department of Energy Plant Technology investigations on the spectral emissivity of different coal ashes and slags were performed applying a spectral radiometer. The samples were electrically heated. Temperatures were varied between 600 and 1400 °C. Emissivities in the range of wavelengths from 1 to 15 μm have been determined. An essential result is that coal ashes show selective thermal radiation characteristics. The main factor of influence on the emissivity is the chemical composition. Therefore, measurements on the single phases SiO2, Al2O3 and MgO were carried out and compared with the emissivity of typical coal ashes and slags. Furthermore, the emissivity depends on temperature, mainly in the wavelength range from 1 to 6 μm.

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