Floating nuclear power plant water feeding pump necessary net positive suction head setting method

Abstract

The invention discloses a floating nuclear power plant water feeding pump necessary net positive suction head setting method. A water feeding pump communicates with an oxygen removal water tank through a pipeline, the pipeline is formed by connecting a plurality of pipeline segments, every two adjacent pipeline segments are not in the same straight line, the junction of every two adjacent pipelinesegments and the junctions between the pipeline segments and the water feeding pump and oxygen removal water tank are joints, and the length, width and height directions of a hull are correspondinglydefined as X, Y and Z axes. The method comprises the following steps of repeatedly measuring relative coordinates of all joints relative to the sway center of the hull; calculating the additional pressure drop borne when the pipeline rotates around the X, Y, and Z axes and additional pressure drop borne by translational motion along the X, Y, and Z axes during measurement each time; calculating the sum of the frictional pressure drop of the pipeline and the form drag pressure drop of a local resistance piece on the pipeline; calculating and obtaining the minimum value of the effective net positive suction head at a suction inlet of the water feeding pump; and calculating the necessary net positive suction head of the suction inlet of the water feeding pump according to the minimum value.By means of the method, the necessary net positive suction head meeting the running requirement of the water feeding pump can be calculated.

Description

technical field [0001] The invention relates to the technical field of water supply systems for steam power plants, in particular to a method for setting the necessary NPSH of feedwater pumps in floating nuclear power plants. Background technique [0002] Changes in the motion state of the hull under ocean conditions will affect the flow characteristics of the fluid in the power system, and then affect the operating characteristics of the power system. As the key equipment of the secondary circuit system of the floating nuclear power plant, the main feedwater pump set can effectively prevent the cavitation of the main feedwater pump is the key to improving the service life of the main feedwater pump set. Affected by ocean conditions, the water supply system of floating nuclear power plants will generate additional acceleration and additional force. The additional force changes the effective height, which may cause the inlet pressure of the feedwater pump to be lower than the...

AI Technical Summary

Problems solved by technology

Since the marine environment has not been accurately simulated, most of the practical engineering applications have the problem of too large swing angle and too small cycle value, which greatly reduces the effective NPSH of the feed water pump, and the feed water pump provided by the manufacturer must The NPSH is difficult to meet the requirements, and the effective NPSH of the feed water pump can only be increased by increasing the height difference between the deaeration water tank and the feed water pump, which increases the difficulty of the space layout of the hull

Images