UKERC EDC: Publications

DTICC148_file20055.pdf

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Abstract:

The aims of this project were:

To reduce the capital and through life cost of steam turbines generating with clean coal technologies at steam temperatures above 570°C.

To develop the materials and welding technology necessary to provide a fabricated steam turbine rotor to operate with elevated steam temperatures in the high temperature part and long, high strength, turbine blades in the low temperature part of the rotor.

To fully characterise the microstructures and properties of such steam turbine rotors to enable the development of lifeing methodologies.

An investigation has been made into the possibility of welding together 10%Cr and 3.5%NiCrMoV rotor steels, a combination which would allow manufacture of large turbine rotors with inlet steam temperatures in excess of 570°C.

Following a comprehensive modelling programme by the University of Cambridge and complementary testing and examination by Siemens Power Generation (SPG), a welding procedure was developed and successful narrow gap TIG welds were made between 380mm diameter, 50mm thick material. This was accomplished using the established Tungsten Inert Gas (TIG) filler wire.

This summary provides information on:

Objectives

Summary

Background

Development Procedures

Conclusions

Future Work

Cost

Duration

Contractor

Collaborators

Further Information