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Số người truy cập: 107,001,726

 Sensitivity study on the influence of the complex refractive indices on the radiative properties of coal and fly ash and the radiative heat transfer in a pilot-scale pulverised coal combustion
Tác giả hoặc Nhóm tác giả: Huynh, N. Hung*; Szuhánszki, János; Ma, Lin; Ingham, Derek; Pourkashanian, Mohamed
Nơi đăng: Proceeding of the 6th International Conference on Sustainable Energy (ICSE 2020); Số: 1953;Từ->đến trang: 150-157;Năm: 2020
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
Radiative heat transfer has been receiving special attention in oxyfuel combustion, a leading option for carbon capture and storage (CCS). The high-concentrations of CO2 and H2O under the oxyfuel condition, however, has been demonstrated to slightly enhance the total radiative heat transfer because of the dominance of the particle radiation. In this study, an in depth sensitivity study is performed with a focus on investigating the effect of the complex refractive indices for determining the radiative properties of coal and ash particles and calculating the radiative heat transfer in pulverised coal combustion, with different available databases of the ash and coal being employed. The influence of the complex refractive indices on the radiative heat transfer is investigated on the 250 kW pilot scale combustion test facility (CTF) of the Pilot-scale Advanced Capture Technology (PACT) facilities operated by the UKCCSRC. Both the non-grey WSGG and the Mie theory for gas and particles properties, respectively, were incorporated into the commercial software ANSYS FLUENT using user defined functions (UDFs). The results obtained by the modelling investigation are compared against the experimental data. This study highlights the influence of the complex refractive indices employed to determine the radiative properties and the radiative heat transfer in the simulation of pulverised coal furnaces. The result from this study on the pilot-scale furnace shows that the heat flux is somewhat sensitive to the spectral database of the ash while it appears less sensitive to the spectral database of the coal.
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