Optimization of hydraulic performance in indirect cooling water pump intakes of nuclear power plant
Indirect cooling technology is the primary technology and research focus in the development of inland nuclear power plants.To operate the cooling water system safely and effectively,the pump intake must have good hydraulic performance.the physical model tests of circulating water pump intakes were carried out in conjunction with the world's first nuclear power project that uses an indirect cooling technology with an ultra-large high level water intake seawater cooling tower in order to simulate and analyze the flow pattern,hydraulic performance,and water level fluctuation caused by the start and stop of the pumps.The test results shows that the indirect cooling wa-ter pump intake with high intake cooling tower has the following characteristics:big intake flow,lateral forebay in-let,limited volume,and high layout,among others.The safe and stable operation of the circulating pump is im-pacted by the uneven velocity distribution in the pump intake,the serious bias in the suction chamber,the pre-swirl in front of the suction bell,and the excessively large vortex angle of the pump's suction pipe when rectifica-tion measures are not taken.The optimization measures are put forward pertinently.Multiple rows of rectification piers are arranged in the forebay to form a grid array,which is used to optimize the flow pattern.Rectification piers and breast walls are arranged in the pump sump to optimize the flow pattern and eliminate eddies.These measures im-prove the flow pattern of the pump intake,and meet the requirements of a smooth and uniform circulating pump flow.In addition,the maximum static water level of the filling system and the interval period of the start-stop pumps are provided based on the test results of the water level fluctuation of the start-stop pumps.The research results can pro-vide reference for the indirect cooling water system optimization designs in subsequent nuclear power plants.
万方数据
维普
