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采用双线性四边形法对螺旋管圈水冷壁和鳍片进行了剖分。将螺旋管圈水冷壁在平面上展开并划分为7个区段,采用分区段热力计算的方法确定各区段平均热负荷,通过对焓增值的计算确定各管工质在各个区段入口和出口的压力和温度。在螺旋管圈出口位置布置了温度测点,计算了在70%锅炉最大连续蒸发量(boiler maximum continuous rating,BMCR)、65%BMCR、60%BMCR3种工况下的各段校核水冷壁壁面温度,通过螺旋管圈出口处计算值与测量值的比较验证了计算模型的合理性。采用传热恶化试验关联式,预测了超临界锅炉运行在近临界压力区发生传热恶化后的最高管壁温度,为锅炉的安全运行提供了比较可靠的参考数据。
The bilinear quadrilateral method was used to segment the spiral wall waterwall and the fin. The spiral wall of the water wall in the plane and divided into seven sections, the use of sub-section thermal calculation method to determine the average heat load in each section, through the enthalpy calculation to determine the value of each tube inlet and outlet in various sectors The pressure and temperature. The temperature measuring points were arranged at the outlet of spiral coil, and the water wall wall surface was calculated in the sections of 70% boiler maximum continuous rating (BMCR), 65% BMCR, 60% BMCR The comparison of the calculated and measured values at the exit of the coil shows that the model is reasonable. The correlation of heat transfer deterioration test was used to predict the maximum wall temperature of supercritical boiler operating in the near critical pressure region after the heat transfer was deteriorated, which provided a reliable reference data for the safe operation of the boiler.