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1000MW nuclear power plant centrifugal charging pump hydraulic design and structural reliability study

Author: FuQiang
Tutor: YuanShouQi
School: Jiangsu University
Course: Fluid Machinery and Engineering
Keywords: Nuclear power plant Centrifugal charging pump Hydraulic design Numerical Simulation Critical speed Thermosetting coupling Seismic calculation Reliability Analysis
CLC: TH311
Type: PhD thesis
Year: 2010
Downloads: 442
Quote: 3
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Abstract

This article National Outstanding Youth Fund (No.: 50825902), Jiangsu Science and Technology Support Program (industrial sector) (ID: BE2010156), Jiangsu University Graduate Research and Innovation Plan (ID: CX08B-0632) and Zhenjiang City industrial research programs (No. : GY2008002) funded project part. Centrifugal charging pump is a nuclear power plant a circuit of the chemical and volume control system (RCV) is an important component is the most critical nuclear power plant, is one difficulty after the main pump Ⅱ level of nuclear safety equipment. Centrifugal charging pump is a horizontal, double-shell, tubular multistage centrifugal pump, with a flow of small, high lift, high speed, cavitation requirements, matching motor power characteristics, nuclear power specification requires that the pump must be To accurately reach five operating point performance, but also to meet the thermal shock and seismic requirements, technical difficulty. Currently 1000MW nuclear power plant centrifugal charging pump all imports, domestic application performance remains blank. Industry-recognized domestic constraints on the charge pump hydraulic model of the biggest challenges is the development of the prototype. In addition, the structural design of charging pump, thermal shock resistance, shock resistance and torsional vibration of the rotor and other structural constraints on the reliability of the charge pump is an important factor in localization. Based on the centrifugal charging pump hydraulic model development, numerical simulation of hydraulic performance, four hydraulic model prototype performance and cavitation test, the rotor dynamic torsional vibration calculation, thermal solid coupling calculations and seismic calculation, and many other studies aimed at resolving constraints on the localization of the charge pump hydraulic design and structural reliability and other technical problems for the centrifugal charging pump localization provide a theoretical basis. This paper studies the work and creative achievements are: 1. Comprehensive and systematic analysis of the domestic and foreign high-temperature high-pressure multistage centrifugal double-shell research, introduced the charging pump in the important role of 1000MW nuclear power plants, nuclear power plants are given on centrifugal charge pump hydraulic performance and structural special design requirements. On this basis, the charge pump for the hydraulic design, structural design, the rotor critical speed calculations, thermosetting coupling calculation, seismic and other related theoretical development for a more in-depth analysis, development of the final structure of the charge pump design . 2 pairs of charging pump suction chamber 8 kinds of designs of the internal flow field numerical simulation of unsteady flow comparative study. Using RANS Reynolds averaged equations are numerically solved to RNG k-ε turbulence model to close the Reynolds stress term, the application of incompressible flow SIMPLEC algorithm for solving the pressure field, the realization of eight kinds of designs under the impeller three-dimensional viscous flow field Numerical simulation of turbulent flow. Through the design flow conditions and non-design flow conditions inside the suction chamber 8 kinds of program flow velocity, pressure, turbulent kinetic energy distribution of the comparative analysis, found that: the larger suction chamber inlet can reduce water loss, but the annular space using arc shaped and straight-shaped structure has little effect on the hydraulic losses, calculation results show that good straight annular space even smaller than the hydraulic losses arc structure. Suction chamber through the eight kinds of design analysis and evaluation for the final stage impeller for optimal charging pump hydraulic design provide a theoretical basis. 3 for the first time using multistage centrifugal pump hydraulic design multi-state method, the charging pump stage impeller, the impeller secondary unsteady flow and unsteady flow numerical simulation comparative study. Which uses eight kinds of first stage impeller design, the secondary impeller 8 kinds of design. The results showed that: first stage impeller cavitation performance is affected by the impeller geometry parameters influenced, in addition, the guide vane inlet velocity and pressure distribution along the circumferential direction was a significant cyclical fluctuations, the impeller outlet jet and wake region of existence and the location of the pump impeller flow and structure of a great relationship, and further confirms the charge pump impeller to guide vane from the whole flow field flow characteristics strongly asymmetric. Through different designs and different flow conditions of the numerical simulation comparative analysis reveals the impeller and guide vane movement between the interference flow field. Through multiple design options different flow conditions of the numerical simulation, numerical prediction of the centrifugal pump performance curve. Right on the charge pump, the hydraulic performance to meet its requirements multiple operating points, while the conventional hydraulic design methods can not meet the design requirements, so multi-state hydraulic design method solves this problem, as the charging pump hydraulic design provides a new way. 4 To verify the charging pump hydraulic design, creating a four on the charge pump prototype experiment through external characteristic charging pump hydraulic performance tests and performance tests of cavitation, and with the numerical results were compared, proved hydraulic design correctness and accuracy of numerical simulation and performance prediction is feasible. 4 prototype hydraulic test results are translated by the similarity with the required performance parameters for comparing the results showed that: the required five working point hydraulic performance to meet the requirements, the maximum flow operating point when maximum deviation is 4.7%. 4 prototype will use pulley speed is increased to 4500 r / min, cavitation performance tests conducted, cavitation performance to meet the design requirements. On this basis, were 12 real charging pump hydraulic performance numerical computation. 5 for the first time on the charge pump rotor critical speed analysis. Analysis and calculation of several different factors on the charging pump rotor parts natural frequency (can be converted to the critical speed) the impact of various conditions and then integrated computing critical speed of the rotor assembly. After calculation, the rotor components in the elastic support under the first natural frequency of 253.405Hz, namely 15204.3 r / min, while the actual charging pump rated speed of 4500 r / min, showed that the structural dynamics of charging pump is designed to meet the design requirements. In addition, the supporting stiffness critical speed of the rotor assembly is relatively large, accurately simplify support and reasonably determine the bearing stiffness, damping matrix is ??an indispensable prerequisite for calculating the critical speed. 6 for the first time on the charge pump housing body for pressure stress analysis, transient thermal analysis, thermal stress analysis and indirect coupling analysis, given the stress superposition method and indirect coupling method and compare the results of the stress assessment. The maximum stress intensity pressure occurs in the inner wall of the outer housing end node 1849, the total stress strength 42.91 MPa. Combination of indirect coupling method for solving the maximum stress intensity also occurred in the inner wall of the outer housing end node 1849, the combined total stress strength of 42.83 MPa. Stress superposition method and indirect coupling method on PL Pb Q ≤ 3Sm assessment results are basically consistent. 7 for the first time on a charge pump seismic analysis. Using ANSYS finite element software for the domestic pressurized water reactors with a double casing centrifugal charging pump, a 3D finite element model of a charging pump calculated natural frequencies and mode shapes, and the charging pump and the OBE SSE seismic loads were calculated seismic performance analysis, the results showed that: (1) in the modal analysis to see on the charge pump fundamental frequency 655.138 Hz, is much greater than 33 Hz, indicates that the overall charging pump for the rigid structure. In addition, the first-order modes in a horizontal direction, indicating the displacement response under earthquake horizontally oriented. Show on in the design phase to consider increasing the strength of the charge pump in the horizontal direction can be effectively reduced seismic impact on the charging pump. (2) In the OBE seismic loads, weight, temperature, while under the effect of stress on the charge pump maximum response occurred in central outer shell for 69.13 MPa, according to the third strength theory checking, the allowable value, the seismic design of nuclear power plants to meet specification requires two components; seismic loads in SSE, weight, temperature, while under the effect of stress on the charge pump maximum response occurred outer shell middle of 103.47 MPa, according to the third strength theory checking, within the allowable value, to meet nuclear power plant seismic design of two parts requirements, so charging pump in the OBE and SSE seismic loads, to ensure the structural integrity and operability. (3) calculate the maximum response displacement occurred outer shell middle of 0.345 mm, much smaller than the stationary member and the gap between the rotating parts 1 mm, explain double-shell centrifugal charging pump in the structure to meet seismic requirements. Code for seismic design of nuclear power plants to meet the two components required to ensure structural integrity and operability.

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