Design method for preventing steam hammer of main steam valves of steam turbine of nuclear power plant

Abstract

The invention relates to a design method for preventing a steam hammer of main steam valves of a steam turbine of a nuclear power plant. The steam turbine is provided with four main steam valves; and four main steam pipelines are respectively connected between the four main steam valves and a main steam header. The method comprises the following steps of: S1, establishing a main steam pipeline layout model; S2, performing the main steam pipeline layout calculation of primary stress and secondary stress calculation; S3, calculating response spectrums of working conditions of a steam hammer of the steam turbine to obtain the response spectrums of harsh working conditions; S4, taking the response spectrum of the worst working condition as a design input, arranging a pipeline damper at the maximum stress point of the main steam pipelines, and performing dynamic simulation calculation, if a result meets design requirements, performing the step S6, and otherwise, performing the step S5; S5, adjusting the rigidity of the pipeline damper, performing the dynamic simulation calculation again, if the result meets the design requirements, performing the step S6, and otherwise, repeating the step S5; and S6, outputting a pipeline damper list and a rigidity value. The design method provided by the invention can meet the design requirements on extremely harsh working conditions, and is safe and reliable.

Description

technical field [0001] The invention relates to a design method for steam hammer prevention of a main steam valve of a steam turbine in a nuclear power plant. Background technique [0002] The steam in the nuclear power plant is saturated steam, and the amount of steam is relatively large. When the nuclear power plant is running, if the nuclear island needs to shut down for safety reasons, the steam turbine will shed the load. At this time, the main steam valve of the steam turbine is all closed to protect the steam turbine. like figure 1 As shown, the pipeline schematic diagram of the main steam system, in which the ports 1, 2, 3 and 4 are respectively connected to the four main steam valves, and the other end of the pipeline is connected to the main steam header. When the main steam valve of the steam turbine is closed, a steam hammer will be generated. The steam hammer will generate a huge impact force and torque on the cylinder block of the steam turbine and the main st...

AI Technical Summary

Problems solved by technology

At present, there is no effective anti-steam hammer design method for the main steam valve of steam turbines in nuclear power plants, and it is difficult to meet the anti-steam hammer requirements under severe working conditions

Images