| Title | Turbine Materials for Geothermal Power Generation |
|---|---|
| Authors | Yamamoto, M., Miyazaki, M., Watanabe, O., Amemiya, M., Suzuki, Y., |
| Year | 1988 |
| Conference | Japan International Geothermal Symposium |
| Keywords | |
| Abstract | Geothermal power generation have been gradually increased for past twenty years and will be steadily promoted as the alternative electric source of fossil power generation. ,Recently, m~ny large turbine units over 100 MW have been constructed, in addition to small turbine units. The reliability of powerplants becomes more important with the increase in the unit capacity. The schematic drawing of typical 130 MW class turbine unit is shown in Fig.l. Since the high availability of geothermal power plants depends strongly on the high reliability of turbine components such as rotor, blades and other structural components, many efforts on material and design modification have been continuously made. Major concerns on materials to improve reliability of plants are the best selection of high resistant materials and protection methods to the corrosionrelated problems caused by geothermal steam containing harmful elements such as clorine, hydrogen sulfide and carbon dioxide, as well as an improvement of material qual{ty. Since the geothermal steam chemistry is significantly varied in different geothermal power stations, it it extremely important to evaluate the corrosion behaviour of materials such as general corrosion, stress corrosion cracking and corrosion fatigue strength in the field tests using actual geothermal steam. We have carreid out many field tests in domestic and foreign countries for many years. The data base accumulated have been utilized to make further improvement of plant reliability. In this paper, the material development and optimization for geothermal steam turbine components are reported, based on· fundamental field corrosion test data. |