The mathematical model for two-phase flow and heat transfer of wet steam in exhaust pipe for a 600 MW power generating unit with direct air cooling is established.

In Hanfeng Power Plant the deformation caused displacement of a 660 MW set s BFPT exhaust pipe effected a gland clearance change of the auxiliary turbine.

The three dimensional flowing field of steam in direct air cooling exhaust ducts was simulated via computational fluid dynamics(CFD) software called fluent for Datong 600MW power generating unit.

The paper reports on the calculation of the reaction forces of the BFPT s exhaust duct under 12 operating condition including different temperatures, pressures and earth quake intensitics, simultaneously including of a strength and stiffness analysis of the duct s structure.

The optimal design for exhaust ducting mode and internal structure in direct cooling exhaust duct system is very important for us.

The mathematic model for two-phase flow and heat transfer of wet steam in direct air cooling exhausted duct of a 2×135MW power generating unit,which is designed by SPX corporation,is constructed.

Based on actual project, the flowing field of steam in direct air cooling exhausted duct for 135MW power generating unit is simulated via Computational Fluid Dynamics (CFD) software.

The mathematic model for two-phase flow and heat transfer of wet steam in direct air cooling exhausted duct for Huadian Lingwu the first stage 2×600MW power generating unit in China is constructed.

The thesis expresses velocity distribution of the exit of the exhaust hood of 300MW turbine effect on temperature difference of the condenser.

The velocity distribution of the exhaust hood of 300 MW introduced turbine is not uniform.

CFD software is used to perform 3-D numerical simulation of steam flow field inside direct air-cooling exhaust steam pipe of a 660 MW supercritical unit.