摘要
O_2/CO_2燃烧技术是一种新型的清洁燃烧技术。在该燃烧气氛下,由于烟气中CO_2的浓度高达90%左右,使得烟气的传热特性发生了很大改变。本文利用灰气体加权和模型、Leckner数学式和指数宽谱带模型对高CO_2浓度的混合气体的辐射特性进行了计算分析。根据O_2/CO_2燃烧烟气组分的特点,选择合适的计算混合气体相关物性数据的计算公式,对该气氛下烟气的对流换热系数进行了计算和讨论。结合O_2/CO_2燃烧技术的特点,分析了该技术与常规空气燃烧技术之间的差异,得到了该气氛下锅炉机组的整体布置方案。以衡水电厂300MW煤粉锅炉为原型,利用计算不过于繁琐、理论又比较成熟的指数宽谱带辐射模型和对流换热系数计算方法,进行了O_2/CO_2燃烧气氛下的锅炉设计的热力计算,得到了合理的受热面结构,并与原型锅炉结构进行了比较分析。
Oxy-fuel combustion technology is a new clean-combustion technology. The concentration of CO_2 in flue gas reaches 90% approximately. So the characteristics of heat transfer of flue gas have changed to a large extent. Radiative properties of mixture gas with high carbon dioxide concentration are calculated and analyzed by using the weighted sum of grey gases model, Leckner method which based on the narrow spectrum model and the exponential wide band model. According to the features of flue gas in O_2/CO_2 combustion, appropriate formulas are chose to calculate interrelated physical datas of gas mixture. Combined with the characteristics of O_2/CO_2 combustion, diffrences between this technology and air-fired technology are put forward and analyzed. The general overall layout of the boiler at this atmosphere is accomplished. Based on a coal-fired boiler of 300 MW of Hengshui power station, boiler thermodynamic calculation is carried out using EWBM which is mature and easy to compute in relative terms and the computation method of convention heat transfer. Then suitabal configurations of heating surface are obtained.
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