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以某600 MW煤粉锅炉为例,进行了微富氧燃烧方式下锅炉的结构概念设计及受热面优化,并和空气燃烧、纯氧燃烧模式下的特性参数进行了比较.结果表明:与空气燃烧及纯氧燃烧相比,微富氧燃烧模式下单位时间炉膛内烟气量减少,理论燃烧温度升高,辐射换热加强;烟气与工质的辐射换热量及对流换热量与前两者相比均有很大不同,因此需要对其烟气、工质两侧的能量分布进行重新匹配;优化设计后微富氧燃烧锅炉本体尺寸减小,受热面的布置也发生了很大改变,总受热面面积比空气燃烧时减少了46.5%.
Taking a 600 MW pulverized coal fired boiler as an example, the structural concept design and heating surface optimization of the boiler under the micro-oxygen rich combustion mode were carried out and compared with the characteristic parameters of the air combustion and pure oxygen combustion modes.The results showed that: Combustion and pure oxygen combustion compared to micro-oxygen combustion mode per unit time in the furnace to reduce the amount of flue gas, the theoretical combustion temperature increases, enhanced radiation heat transfer; flue gas and refrigerant radiation heat transfer and convection heat transfer and The former two are very different from each other, so the energy distributions on both sides of the flue gas and working fluid need to be re-matched. After optimizing the design, the size of the main body of the micro-oxyfuel combustion boiler decreases and the arrangement of the heating surface also occurs Large changes, the total heating surface area was reduced by 46.5% when burning air.