Radiative heat release from premixed oxy-syngas and oxy-methane flames

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• 作者：Martin de la Torre ; A.S.M. Arifur Chowdhury ; Norman Love ; ^{ndlove@utep.edu" class="auth_mail" title="E-mail the corresponding author} ; Ahsan Choudhuri
• 关键词：Oxy-syngas ; Oxy-methane ; Spectral radiation ; Global radiation ; Radiative heat release factor
• 刊名：Fuel
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：166
• 期：Complete
• 页码：567-573
• 全文大小：1388 K

文摘

The abundant supply of coal globally and its energy content per unit mass make the use of this fuel an attractive option for power generation. However, with increasingly strict environmental regulations imposed on greenhouse gas emission technologies the future use of coal in its current form is questionable. One solution to reduce pollutant emissions is oxy-combustion with coal-derived syngas, which can provide a method of using coal efficiently with carbon capture. This paper presents a study of the radiative heat release properties from oxy-syngas and oxy-methane flames. This is relevant since the radiative properties of prospective oxy-combustion systems are not fully known. In many oxy-fuel systems the flue gas stream is recycled and premixed with the fuel and oxidizer to reduce flame temperatures. It is estimated that the radiative heat transfer from these recirculated gases will significantly increase due to the increased emission of radiation from CO₂ and H₂O in the 1.2 μm to 5 μm wavelength range, which can impact future combustor design models. Motivated by this, this work aims to provide a study of the global and spectral radiation properties of oxy-syngas combustion and how relevant variables affect radiative emissions. Theses variables include the effect of CO₂ acting as a diluent, percentage of H₂ in the fuel, firing input, and the effects of equivalence ratio on the flame’s radiative heat release and spectral radiation of CO₂ and H₂O. The current study reveals that the radiative heat release factor of syngas flames decreases at higher firing inputs. It was also observed that the radiative heat factor decreased at high hydrogen concentrations. An increase in heat release factor is also measured at higher recirculation ratios of CO₂.