Investigation on thermal radiation spectra of coal ash deposits
Abstract
This paper deals with thermal radiation properties of ash deposits on a pulverized coal boiler of an electric power plant. Normal emittance spectra in the 2.5-25 mu m interval, and total normal emittance, were measured on 4 kinds of ash layers of a mm magnitude order thickness, at 560 -> 1460 -> 560 K in heating and cooling. It was found that ash powder layers are opaque for infrared radiation. The emittance increases with ash radiation wavelength and temperature. Ash powder is sintered and fused above 1200 K. The emittance of the sintered layer is above that of the unsintered layer. The authors propose, and explain by an example, correlating the experimentally obtained emittance spectra of ash deposits with a continuous curve, the formula of which defines the dependence of emittance on wavelength and temperature, i.e. epsilon = epsilon(lambda,T). Use of this formula, with parameter values determined by the proposed methodology, may greatly simplify the practical application of the exp...erimentally determined emittances in the thermal design of existing and new steam boiler furnaces.
Keywords:
Wavelength / Thermal radiation / Temperature / Spectroscopy / Coal ash depositSource:
International Journal of Heat and Mass Transfer, 2009, 52, 11-12, 2871-2884Publisher:
- Pergamon-Elsevier Science Ltd, Oxford
Funding / projects:
- Ministry of Education, Science and Technology of Japan [01200058]
DOI: 10.1016/j.ijheatmasstransfer.2008.12.007
ISSN: 0017-9310
WoS: 000265807200048
Scopus: 2-s2.0-63149177302
Collections
Institution/Community
Mašinski fakultetTY - JOUR AU - Saljnikov, Aleksandar AU - Komatina, Mirko AU - Manović, Vasilije AU - Gojak, Milan AU - Goričanec, Darko PY - 2009 UR - https://machinery.mas.bg.ac.rs/handle/123456789/955 AB - This paper deals with thermal radiation properties of ash deposits on a pulverized coal boiler of an electric power plant. Normal emittance spectra in the 2.5-25 mu m interval, and total normal emittance, were measured on 4 kinds of ash layers of a mm magnitude order thickness, at 560 -> 1460 -> 560 K in heating and cooling. It was found that ash powder layers are opaque for infrared radiation. The emittance increases with ash radiation wavelength and temperature. Ash powder is sintered and fused above 1200 K. The emittance of the sintered layer is above that of the unsintered layer. The authors propose, and explain by an example, correlating the experimentally obtained emittance spectra of ash deposits with a continuous curve, the formula of which defines the dependence of emittance on wavelength and temperature, i.e. epsilon = epsilon(lambda,T). Use of this formula, with parameter values determined by the proposed methodology, may greatly simplify the practical application of the experimentally determined emittances in the thermal design of existing and new steam boiler furnaces. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - International Journal of Heat and Mass Transfer T1 - Investigation on thermal radiation spectra of coal ash deposits EP - 2884 IS - 11-12 SP - 2871 VL - 52 DO - 10.1016/j.ijheatmasstransfer.2008.12.007 ER -
@article{ author = "Saljnikov, Aleksandar and Komatina, Mirko and Manović, Vasilije and Gojak, Milan and Goričanec, Darko", year = "2009", abstract = "This paper deals with thermal radiation properties of ash deposits on a pulverized coal boiler of an electric power plant. Normal emittance spectra in the 2.5-25 mu m interval, and total normal emittance, were measured on 4 kinds of ash layers of a mm magnitude order thickness, at 560 -> 1460 -> 560 K in heating and cooling. It was found that ash powder layers are opaque for infrared radiation. The emittance increases with ash radiation wavelength and temperature. Ash powder is sintered and fused above 1200 K. The emittance of the sintered layer is above that of the unsintered layer. The authors propose, and explain by an example, correlating the experimentally obtained emittance spectra of ash deposits with a continuous curve, the formula of which defines the dependence of emittance on wavelength and temperature, i.e. epsilon = epsilon(lambda,T). Use of this formula, with parameter values determined by the proposed methodology, may greatly simplify the practical application of the experimentally determined emittances in the thermal design of existing and new steam boiler furnaces.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "International Journal of Heat and Mass Transfer", title = "Investigation on thermal radiation spectra of coal ash deposits", pages = "2884-2871", number = "11-12", volume = "52", doi = "10.1016/j.ijheatmasstransfer.2008.12.007" }
Saljnikov, A., Komatina, M., Manović, V., Gojak, M.,& Goričanec, D.. (2009). Investigation on thermal radiation spectra of coal ash deposits. in International Journal of Heat and Mass Transfer Pergamon-Elsevier Science Ltd, Oxford., 52(11-12), 2871-2884. https://doi.org/10.1016/j.ijheatmasstransfer.2008.12.007
Saljnikov A, Komatina M, Manović V, Gojak M, Goričanec D. Investigation on thermal radiation spectra of coal ash deposits. in International Journal of Heat and Mass Transfer. 2009;52(11-12):2871-2884. doi:10.1016/j.ijheatmasstransfer.2008.12.007 .
Saljnikov, Aleksandar, Komatina, Mirko, Manović, Vasilije, Gojak, Milan, Goričanec, Darko, "Investigation on thermal radiation spectra of coal ash deposits" in International Journal of Heat and Mass Transfer, 52, no. 11-12 (2009):2871-2884, https://doi.org/10.1016/j.ijheatmasstransfer.2008.12.007 . .