Numerical analysis of temperature and stress field in valve housing of super critical steam turbine;

Based on the FEM,the calculation and analysis were performed for the transient temperature fields and stress fields of the intermediate pressure main steam valve housing under various operating conditions including cold startup,shutdown,strong hot startup,limit hot startup and accidental condition in 200MW unit in power station.

Δε-Nf curve of ZG15Cr1Mo1V which is widely used in the casing and valve housing has been got through the modified universal slopes method .

Through the use of a structural-analysis finite element method,calculation was conducted to temperature field,thermal stress field and comprehensive stress field of the valve body of a pint-sized steam turbine under the cold startup condition.

The article describes the design process of the stop and control valve body machining for introduced 600MW steam turbine, and gives detailed solution of every difficulty.

Included are main stop valve casings and high as well as middle pressure cylinder casings.

The paper puts forward and describes a new machining method to avoid the shortcoming of traditional method of gate valve shell machining and makes a comparison of advantages and disadvantages between the new method and the old one.

FEM analysis of eleastic stress of gate valve casing of dual-oven high-pressure vacuum gas queching furnace;

The ANSYS program for FEM analysis of heavy-duty structures is introduced into the gate valve casing of a dual-oven high-pressure vacuum gas quenching furnace of which the APDL language is used to parametrize such processes as 3-D solid modeling, constraints/loadings setting and element dividing.