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本文根据能量转换与传递过程中应守恒的原理,推导出沸腾床燃烧产物的热平衡方程式,同时指出沸腾床热力计算偏差的原因,并不是因为床中存在一个所谓的“燃烧份额X”,而主要是忽略了埋管中传热工质温度变化的因素,将在温度较低的情况下(如水温30℃)测得的炉床的传热系数K,作为在相同燃烧工况下,不同蒸汽参数沸腾燃烧锅炉(埋管受热面内工质温度为相应工作压力下的饱和温度)传系热数K而造成。通过试验证实在同一燃烧工况下测得炉床的K值,是随埋管受热面内工质的平均温度升高而增加的。
In this paper, the heat balance equation of the products of fluidized bed combustion is deduced according to the principle of conservation in the process of energy conversion and transfer, and the reasons for the deviation of fluidized bed calculation are not the result of a so-called “combustion share X” in the bed, Is neglected pipe heat transfer working fluid temperature changes in the factors, will be in the case of lower temperatures (such as water temperature 30 ℃) measured hearth heat transfer coefficient K, as the same combustion conditions, different steam Boiling parameters of the boiler (heat pipe surface temperature of the working medium under the corresponding working pressure of the saturation temperature) K heat transfer caused. It is confirmed through experiments that the K value of the hearth measured under the same combustion condition increases with the average temperature of the working medium in the heating surface of the buried pipe.