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以某台1 000 MW超超临界塔式锅炉作为研究对象,采用分区计算简化高参数超超临界锅炉炉内对流与辐射传热模型,分析不同锅炉负荷条件下膜式水冷壁工质温度的分布规律,将计算结果与实测数据进行比较,最大偏差为1.66%,认为该模型可以预测水冷壁工质温度分布。研究表明:超临界压力下工质由液态直接过渡为汽态,相变区内工质温度变化很小;亚临界压力下存在汽液共存区,其中的工质温度保持不变,当负荷达到662 MW时工质温度为362.5℃,当负荷达到507 MW时工质温度为344.8℃;计算得到工质温度波动在2.8℃以内,螺旋管圈表现出优越的平衡燃烧扰动能力,水冷壁出口最高工质温度为458.0℃。
Taking a 1 000 MW ultra-supercritical tower boiler as the research object, the convection and radiative heat transfer model in simplified high-parameter ultra-supercritical boiler was simplified by zonal calculation. The distribution of working fluid temperature under different boiler loading conditions was analyzed The calculated results are compared with the measured data, the maximum deviation is 1.66%. It is considered that the model can predict the temperature distribution of working fluid in water wall. The results show that the working fluid changes from liquid to vapor directly under supercritical pressure, and the temperature of working fluid in the phase transition zone is very small. Under the subcritical pressure, there exists vapor-liquid coexistence zone, in which the working fluid temperature remains unchanged. When the load reaches The temperature of working fluid is 362.5 ℃ at 662 MW and 344.8 ℃ when the load reaches 507 MW. The temperature fluctuation of working fluid is within 2.8 ℃. The spiral coil shows superior balance of combustion perturbation ability and the outlet of water wall is the highest Working temperature is 458.0 ℃.