Abstract:The optimization is carried out on imported type 630 MW steam turbine low-pressure cylinder exhaust channel to reduce exhaust steam pressure and improve the running efficiency.In the condenser throat with flow equilib rating device, making its exhaust steam flow field tend to be more reasonable, the heat load of the condenser heat exchange tube is more even.Practical operation and test show that the exhaust steam pressure has lowered more than 0.3 kPa, the corresponding output power has increased 0.18%, and the optimization retrofit of exhaust steam passage has achieved significant results.