STRENGTH AND RIGID ANALYSIS FOR EXHAUST EQUIPMENT OF 600MW SUPERCRITICAL DIRECT AIR-COOLING STEAM TURBINE

The exhaust equipment of a 600MW supercritical, direct, air-cooling steam turbine is a very large and complex box shaped structure. The Y shaped connection nozzle between the exhaust box and steam ducts to ACC is a important part of the exhaust equipment. In order to obtain quantitative results in stress and flexibility for this type of equipment design, this paper sets up a calculation analysis model and studies the strength and rigid properties of a 600MW steam turbine's exhaust equipment using Three-Dimensional Finite Element Analysis method. The stress and displacement distribution of the exhaust equipment under different conditions are obtained. The weak positions in the structure are found and important parts are strengthened or modified. The paper also studies the force that is acting on the turbine LP casing by calculation analysis and the pressure loss when exhaust steam flows through the box, obtained from the blowing test by implementing a simplified test model. The research results of this paper can provide a reference for the design of an air cooling steam turbine's exhaust equipment with the same capabilities.