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 Investigation of particle radiation in a pilot-scale facility for both air and oxy-coal combustion
Tác giả hoặc Nhóm tác giả: H. N. Huynh, A.G. Clements, J. Szuhánszki, W.F. Gale, L. Ma, D.B. Ingham, M. Pourkashanian
Nơi đăng: European Conference on Coal Research and its Applications (ECCRIA), Sheffield, United Kingdom; Số: 11;Từ->đến trang: 1-2;Năm: 2016
Lĩnh vực: Kỹ thuật; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT

ABSTRACT
Radiation heat transfer plays an important role in pulverised coal combustion, influencing overall combustion efficiency, pollutant formation and flame ignition and propagation. The radiation of the gas phase, which is clearly affected by the changes in the CO2 and H2O concentrations under oxyfuel conditions, has received special intention in recent years and several reasonable gas models for engineering modelling have been introduced. However, with the dominant radiative emission and absorption of the particle phase compared to that of the triatomic gases, the behaviour of particles needs to be studied in more detail in order to obtain a more complete model for the radiation heat transfer in pulverised coal combustion. In this study, the non-grey weighted sum of grey gases (WSGG) model, correlated from the HITEMP 2010 data for a wide range of CO2 and H2O ratios, was used to calculate the radiation of the gas phase coupled with the radiation interaction from the particulate phase. Further, the Mie theory has been used to describe the particle radiative properties. Both the non-grey WSGG and the Mie theory properties were incorporated into the commercial computational fluid dynamics (CFD) software ANSYS FLUENT v15.0 using user defined functions (UDFs), and were applied to calculate air and oxyfuel combustion in the 250 kW pilot scale combustion test facility (CTF) of the Pilot-scale Advanced Capture Technology (PACT) facilities operated by the UKCCSRC. The results obtained by the modelling investigation are compared against the experimental measurements, which were obtained under air-fired conditions and a range of oxyfuel conditions. The radiative properties of the particles, such as particle temperature, particle distribution and the effect of turbulence models on the particles are investigated for coal particle combustion in both environments. The focus of this paper has been on particle radiation in order to obtain better predictions of the radiative heat transfer in both air and oxy-fuel conditions. In particular, new parameters for the radiative prediction of the particles are proposed in order to improve the results of CFD predictions of solid fuel combustion.
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