A model has been developed to calculate the coefficient heat transfer in sparse zone of oxy-fuel fired circulating fluidized bed boiler (CFBB). The model shows that the convective heat transfer coefficient is enhanced with increase in CO2 density, bed temperature, and decrease in particle diameter; and, the radiative heat transfer coefficient is enhanced with increase in bed temperature and CO2 density. It was be found that temperature has important influence on both radiative and convective heat transfer. The CO2 density is very important in enhancing the radiative heat transfer. For example, the total heat transfer could be 264.0 w/(m²Ȃ2;k) when the CO2 density is 80% when flue gas at 1273K.
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机译：建立了一个模型来计算氧燃料循环流化床锅炉（CFBB）在稀疏区域的传热系数。该模型表明，对流传热系数随CO2密度，床温和粒径的减小而增加;并且，辐射热传递系数随着床温和CO 2密度的增加而增加。发现温度对辐射和对流传热均具有重要影响。 CO2密度对于增强辐射传热非常重要。例如，当烟气温度为1273K时，CO2浓度为80％时，总传热可能为264.0 w /（m²Ȃ2; k）。
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