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为了提高循环流化床锅炉变工况下传热计算的精度,克服现有的关于炉内平均传热系数模型的不确定性,针对75 t/h循环流化床锅炉,依据在大量变工况试验的基础上所获得的不同负荷下沿炉膛高度的固体物料浓度分布,建立了变工况下分三区计算的传热模型。该传热模型正确反映了炉膛上部过渡区和稀相区平均固体物料浓度随循环流化床锅炉运行主导因素的变化规律。计算结果表明:依据三区传热模型计算的各区温度与试验运行值在各个工况下都吻合较好,该结果为循环流化床锅炉的动态特性研究和仿真研究提供了技术支持。
In order to improve the accuracy of heat transfer calculation under variable conditions of circulating fluidized bed boilers and to overcome the existing uncertainty about the average heat transfer coefficient model in the furnace, for a 75 t / h circulating fluidized bed boiler, Based on the experimental results obtained under different loads along the furnace height of the solid material concentration distribution, established under varying conditions in three areas calculated heat transfer model. The heat transfer model correctly reflects the variation law of the average solid material concentration in the upper transition zone and the dilute phase zone of the hearth with the leading factor of CFB boiler operation. The calculated results show that the calculated temperature and test values of all the zones agree well with each operating condition. The results provide technical support for the dynamic characteristics and simulation of CFB boiler.