Разработка модели процесса сепарации влажного пара в паровом пространстве парогенератора ПГВ-1000М

Abstract

The issue of reducing steam humidity at the output of steam generator is relevant. The value of humidity directly affects the safety and efficiency of power plants. The optimization of steam generator design will enable to enhance its separation properties and reduce steam humidity. Creating a numerical model of wet steam separation process in a full-scale steam generator and its verification will allow proceeding to optimize the steam generator design and evaluate the model effectiveness. This article presents a preliminary study of the wet steam separation process in the steam space of PGV-1000M steam generator. To study the wet steam separation process in the steam space of PGV-1000M steam generator, a numerical model was developed in the ANSYS Fluent finite element analysis system. The following assumptions were made: the surface of the evaporation mirror is flat, drops have a spherical shape, they do not affect the movement of steam, they do not interact with each other, and there is no decay of the droplets. A three-dimensional model of the steam space of PGV-1000M steam generator which allows considering the processes of wet steam separation has been obtained. The analysis of the results has shown that the nature of the processes occurring in the model corresponds to theoretical calculations and operational data. The developed model has been verified and can be used to optimize the steam generator design. Further numerical studies of the developed model will enable to determine the most optimal design of the steam generator which provides the highest efficiency of steam separation. Moreover, it is possible and promising to study the effect of the evaporation mirror surface on the steam humidity in the steam generator. Decreasing the steam humidity at the steam generator output at existing and projected power plants will provide significant savings in funds spent on repairing the steam turbine blade apparatus, and will lead to an increase in the thermal efficiency of the plant.