三菱9F级燃机的基础布置与动力分析研究

Research on Foundation Layout and Dynamic Analysis of Mitsubishi 9F Gas Turbine

本文以某三菱9F级燃机电厂为工程背景,提出一种适用于三菱9F级燃机的基础结构布置形式,并运用有限元软件ANSYS对提出的燃机基础开展模态分析,结果显示燃机基础的一阶固有频率较大程度的避开设备的共振频率范围,具有较好的振动特性。结合主机厂家的《机岛基础设计准则》和《动力机器基础设计标准》,提出一种基础动力特性合规性评价准则,对燃机基础进行谐响应分析,幅频曲线结果显示本燃机基础动力性能满足规范及厂家要求。本研究成果对于类似燃气轮发电机基础或低位式布置的汽轮发电机基础设计具有指导作用,已成功应用在多种新型主机的基础设计工作中。

This article takes a certain Mitsubishi 9F gas turbine power plant as the engineering background,proposes a foundation structure layout suitable for Mitsubishi 9F gas turbines,and uses finite element software ANSYS to conduct modal analysis on the proposed gas turbine foundation.The results show that the first-order natural frequency of the gas turbine foundation largely avoids the resonance frequency range of the equipment and has good vibration characteristics.Then,based on the turbine island foundation design criteria and power machine foundation design standards of the host manufacturer,a compliance evaluation criterion for basic dynamic characteristics was adopted to conduct harmonic response analysis on the gas turbine foundation.The amplitude frequency curve results showed that the dynamic performance of the gas turbine foundation met the requirements of the specifications and the manufacturer.The research results of this study have guiding significance for the design and dynamic analysis of foundations similar to gas turbine generator foundations or low level turbine generator foundations,and have been successfully applied to the basic design work of various new types of main engines.