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超临界循环流化床锅炉水冷屏竖直集箱流量分配数值模拟及试验研究

Flow Distribution in Vertical Header of Water'cooled Screen for Supercritical CFB Boilers
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摘要 针对上海锅炉厂有限公司350MW超临界循环流化床锅炉水冷屏的结构,建立了竖直集箱内空气一水两相流动试验平台.根据质量守恒、动量守恒和补充方程,建立了水冷屏竖直集箱内流量分配的数学计算模型,进行了35%额定负荷时不同千度试验工况下竖直集箱内流量分配的计算,得到了各支管内质量流量不均匀系数、最大质量流量偏差系数、体积流量含气率不均匀系数和最大体积流量含气率偏差系数,并将理论计算值与试验值进行了对比.结果表明:对于单一工况,从第1根支管到第4根支管,质量流量逐渐增加,质量流量偏差系数从负数增大为正数,体积流量含气率逐渐减小,体积流量含气率不均匀系数从正数减小为负数;计算所得数据的变化规律与试验结果一致,且随着干度的增大,计算值与试验值的偏差逐渐减小. Based on the structure of water-cooled screen for a 350 MW supercritical CFB boiler manufac- tured by Shanghai Boiler Works Co. , Ltd. , an experimental setup was established to study the air-water two-phase flow in vertical header of the water-cooled screen. Meanwhile a numerical model was set up for the two-phase flow distribution based on mass conservation, momentum conservation and supplementary e- quations, with which flow distribution in the vertical header was calculated at 35 ~//0 BMCR and different dryness of steam, so as to obtain the mass flow coefficient of uniformity, maximum mass flow deviation coefficient, gas volume coefficient of uniformity and maximum gas volume deviation coefficient in each branch tube. The calculated results were compared with experimental measurements. Results show that under single operating condition, from branch tube 1 to branch tube 4, the mass flow increases gradually; the mass flow deviation coefficient increases from negative to positive; the gas volume flow reduces gradu- ally; the gas volume coefficient of uniformity decreases from positive to negative. The variation tendency of calculated data agrees well with experimental measurements, and with the rise of steam dryness, the er- ror reduces between the calculated results and actual measurements.
作者 张冬青 杨冬 刘计武 肖峰 ZHANG Dong-qing , YANG Dong , LIUJi-wu , XIAO Feng (1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China; 2. Shanghai Boiler Works Co. , Ltd. , Shanghai 200245, China)
出处 《动力工程学报》 CAS CSCD 北大核心 2013年第1期1-5,24共6页 Power Engineering
关键词 超临界循环流化床锅炉 两相流 水冷屏 竖直集箱 流量分配 数值模拟 试验研究 supercritical CFB boiler two-phase flow water-cooled screen vertical header flow distribu tion numerical simulation experimental study
作者简介 作者简介:张冬青(1987-),男,江苏盐城人,硕士研究生,主要从事多相流与传热方面的研究.电话(Tel.):18251826753;E—mail:499057440@qq.com.
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