Abstract

The paper considers the methods of the design analysis of the elastic stress-strain state of cast internal high-pressure casing of 330MW steam turbine is estimated using a three-dimensional computational structural model. The study of this problem is performed using the calculated methods of the volumetric stress-strain state based on the provisions of the theories of elasticity. The problem of determining the stress-strain state of the internal high-pressure casing of the K-330-23.5 turbine in a three-dimensional setting is solved by using the finite element method. The created finite element models consider the contact interaction of the flanges of the two casing halves in the horizontal connector zone. In contact zones, the mesh thickens. Results of the calculated estimation of the stress-strain state of the internal high-pressure casing of steam turbine are given for the elastic deformation, considering the influence loads arising during the installation and operation of the turbine. During the stress-strain state studies, the main zones of stress concentration in internal casing of a K-330-23.5 steam turbine were established.

Keywords:Turbine; Flange connection; Finite element

Abbreviation:SSS: Stress-Strain State; HP: High Pressure; FEM: Finite Element Method; FE: Finite Element; PU: Power Units; SACSP: Super and above Critical Steam Parameters; CFB: Circulating Fluidized Bed Boilers; CCGT: Combined Cycle Gas Turbines; TPP: Thermal Power Plant; JSC: Joint-Stock Company; PM: Penalty Method; LMM: Lagrange Multiplier Method