To Study the Steady State Thermal Analysis ofSteam Turbine Casing

Abstract

An important characteristic of a steam power plant is its ability to maintain reliability and safety of the plant against frequent start-ups and load changes give rise to temperature distribution in steam turbine casing, which results in non-uniform strain and stress distribution. The rapid increase of temperature and rotational speed during starts-ups, especially, makes conditions more severe and causes main components damage and reduction of life span for steam turbine. Thus accurate knowledge of thermal analysis and stresses distribution are required for the integrity and lifetime assessment for the turbine casing. In this work a steady-state thermal analysis of steam turbine casing was established by finite element method (ANSYS Mechanical). A steady-state thermal analysis calculated the effects of steady thermal loads on a system or component. Engineer/analysts often perform a steady-state analysis before performing a transient thermal analysis, which helps establish initial conditions. A steady-state analysis was last step of a transient thermal analysis. In steady-state thermal analysis we determined temperatures distribution of inner part is calculated by conduction, Heat transfer of a casing surface is affected by convection, thermal gradients, heat flow rates, various stress distributions and heat fluxes in an object that are caused by thermal loads that do not vary over time. A steady-state thermal analysis was linear with constant material properties or nonlinear with material properties that depend on temperature. The thermal properties of most material do vary with temperature, so the analysis usually is nonlinear. Including radiation effects also makes the analysis nonlinear.