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针对富氧燃烧循环流化床锅炉(circulating fluidized bed boiler,CFBB)炉内传热特性进行了研究。考虑气体辐射对传热系数的影响,建立了CFBB富氧燃烧下的传热模型。以一台440 t/h循环流化床锅炉为例,通过模型分析了炉内传热情况,并和空气燃烧模式下的传热特性进行比较。进行了氧气浓度在30%、50%、70%气氛下的CFBB炉膛概念性设计。在循环流化床锅炉炉内传热中,灰占主导作用,烟气成分变化对传热系数影响不大。氧气浓度越高,越有必要设置外置换热器来维持炉膛正常运行。
The heat transfer characteristics in a circulating fluidized bed boiler (CFBB) furnace were studied. Considering the influence of gas radiation on the heat transfer coefficient, a heat transfer model of CFBB oxygen-enriched combustion was established. Taking a 440 t / h circulating fluidized bed boiler as an example, the heat transfer in the furnace was analyzed by the model and compared with the heat transfer characteristics under the air combustion mode. The conceptual design of the CFBB furnace was carried out at oxygen concentrations of 30%, 50% and 70%. In the circulating fluidized bed boiler heat transfer, the dominant role of ash, flue gas composition changes have little effect on the heat transfer coefficient. The higher the oxygen concentration, the more necessary to set an external heat exchanger to maintain the furnace normal operation.