Abstract—

The VVER-TOI reactor plant has for the first time been furnished with a new layout of steam generators in the NPP reactor building, according to which the steam produced in the steam generator is removed from it through one steam nozzle. The shift for using one steam-offtake nozzle results in that a nonuniform steam velocity field is produced in the separation volume between the evaporation surface and steam-receiving perforated sheets (SRPSs), which is caused by steam motion along the path with the lowest friction, and this can entail excessive carryover of moisture from the steam generator (SG). To obtain the necessary moisture-separation performance of a horizontal steam generator equipped with one steam nozzle, it is necessary to set up a uniform field of the steam velocity vector’s vertical component in the separation volume with limiting the pressure loss in the SG steam path down to the design value. Therefore, it is proposed to arrange nonuniform flow friction along the steam motion path from the evaporation surface to the steam line by using a variable SRPS perforation ratio. In this study, a set of optimization numerical analyses of the SRPS design for the PGV-1000MKO steam generator performed using the CFD methods was carried out for determining the perforation ratio. In carrying out the optimization numerical analyzes, the performance characteristics of the steam-receiving device equipped with one steam nozzle located in the steam generator’s upper part and consisting of more than 50 perforated sheets had to be made maximally close to the performance characteristics of the steam-receiving device equipped with ten steam nozzles. By using an elaborated computer model, a set of optimization numerical analyses of the SRPS design was carried out, and an optimized design version of the steam-receiving device with a variable perforation ratio for the PGV-1000MKO steam generator has been obtained.

中文翻译：

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PGV-1000MKO蒸汽发生器用吸汽孔板的优化设计

摘要—

VVER-TOI反应堆工厂首次在NPP反应堆厂房中配备了蒸汽发生器的新布局，根据该布局，蒸汽发生器中产生的蒸汽通过一个蒸汽喷嘴从中排出。使用一个蒸汽排放喷嘴的转换导致在蒸发表面和蒸汽接收穿孔板（SRPSs）之间的分离体积中产生不均匀的蒸汽速度场，这是由于蒸汽沿着摩擦最小的路径运动引起的，这可能会导致蒸汽发生器（SG）大量带走水分。为了获得配备一个蒸汽喷嘴的卧式蒸汽发生器的必要的水分分离性能，必须在分离空间中建立蒸汽速度矢量垂直分量的均匀场，同时将SG蒸汽路径中的压力损失限制在设计值以下。因此，提出了通过使用可变的SRPS穿孔率来沿着从蒸发表面到蒸汽管线的蒸汽运动路径布置不均匀的流动摩擦。在这项研究中，对使用CFD方法进行的PGV-1000MKO蒸汽发生器的SRPS设计进行了一组优化数值分析，以确定穿孔率。在进行优化数值分析时，配备一个位于蒸汽发生器上部的蒸汽喷嘴且由50多个穿孔板组成的蒸汽接收装置的性能特征必须最大程度地接近配备有十个蒸汽喷嘴的蒸汽接收装置的性能特征。通过使用精细的计算机模型，对SRPS设计进行了一组优化的数值分析，并获得了PGV-1000MKO蒸汽发生器的可变穿孔率的蒸汽接收装置的优化设计版本。