近临界压力区传热恶化对超临界锅炉水冷壁温度场的影响  

Influences of Heat Transfer Crisis on Temperature Profile of Supercritical Water Wall in Near Critical Pressure Region

作　　者：阎维平[1] 李春燕[1] 米翠丽[1] 梁秀俊[1] 

机构地区：[1]华北电力大学能源与动力工程学院,河北省保定市071003

出　　处：《中国电机工程学报》2009年第35期48-53,共6页Proceedings of the CSEE

摘　　要：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。Bilinear quadrilateral method was used to subdivide the spirally water wall and rectangular fin. The spirally water wall was distributed on the plane and divided into seven sections. The mean heat flux of each section was determined using furnace thermal calculation in sections. The value of the pressure and temperature concerning the working medium at inlet and out of each tube were established by calculating enthalpy increasing. Temperature measuring points were set at the outlet of spirally water wall. Temperature of each water wall was calculated under three working conditions： 70% boiler maximum continuous rating（BMCR）, 65%BMCR and 60%BMCR. The good agreement between the calculated and measured results at the outlet of the spiral tube coil shows the reasonableness of the calculation model. The highest wall temperature after heat transfer deterioration is predicted using heat transfer deterioration experimental association formula when the supercritical boiler runs at near critical pressure zones, which provides more reliable reference data for the boiler safe and stable operation.

关 键 词：近临界 螺旋管圈水冷壁 传热恶化 温度场 

分 类 号：TK16[动力工程及工程热物理—热能工程]