Radiative Properties of Coal Ash Deposits with Sintering Effects
| Autor: | Sean T. Smith, John Parra-Alvarez, Philip J. Smith, Stan Harding, Benjamin Isaac, Terry A. Ring, Minmin Zhou |
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| Rok vydání: | 2019 |
| Předmět: |
Absorption (acoustics)
Materials science General Chemical Engineering Metallurgy technology industry and agriculture Energy Engineering and Power Technology Sintering 02 engineering and technology respiratory system 021001 nanoscience & nanotechnology complex mixtures Fuel Technology 020401 chemical engineering Fly ash Heat transfer Heat exchanger Radiative transfer Emissivity 0204 chemical engineering 0210 nano-technology Chemical composition |
| Zdroj: | Energy & Fuels. 33:5903-5910 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/acs.energyfuels.8b04206 |
| Popis: | The heat-transfer characteristics in the fireside of a pulverized-coal furnace are affected, among other factors, by the physical and chemical characteristics of the ash deposits. Indeed, the physical state of the ash deposits and their chemical composition determine the radiative and conductive properties of the furnace walls. Particularly, several complex mechanisms are involved in the radiative heat-transfer process at the walls that restricts the absorption of the incident radiation of the flame, particles, and hot gases. These mechanisms involve dependencies on the radiation spectrum due to the ash chemical composition and ash-sintering effects that enhance or hinder the overall heat transfer. In this paper, we discuss the complex mechanisms that describe the heat exchange in the presence of ash deposits and their impact on the prediction of the wall emissivity and ultimately the wall heat transfer in a real system. |
| Databáze: | OpenAIRE |
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