Firepower and waterpower electricity making
1. Firepower electricity generating
In order to promote the thermal efficiency of the boiler in heat engine plant, enlarging the equipments and increasing the temperature and pressure for the steam condition are the certain developing direction. Presently, the subcritical and supercritical boiler are industrialized, the applied material for superheat steel pipe can no longer satisfy the requirements, and austenite stainless steel with good hot strength like the TP321 and TP316 shall be regarded as new materials.
2. Waterpower electricity generating
The impeller of water turbine for Waterpower is usually made of stainless steel, in the early days the casting form were mostly used, as the water turbine developed toward big capacity and high fall, in order to improve the performance of the impeller, now forged products are in use, and the steel type has changed from the Cr13 type in early days to the 00Cr13Ni5Mo steel with good welding quality, and the use of stainless steel for water turbine impeller is shown in the following table. Besides, some anti-corrosion and anti-abrasion components in waterpower plant have been successfully used the TP304N (304N) and 2205 double phase steel clad plate.
The application of stainless steel in water turbine impeller
Form of water turbine | Power , MW | Impeller diameter , mm | Material |
French type | 70 48 47 47 45 23 96 42 | 2480 3010 2540 2500 2630 1950 3700 2950 | Cr13 Cr13 Cr18-Ni813Cr bead weld 13Cr bead weld Cr18-Ni8 bead weld Cr18-Ni8 bead weld |
Screw propeller type | 30 21.5 17.55 24 | 3900 4750 2750 4100 | Cr13 Cr13 Cr18-Ni8 Cr13 bead weld |
Perle T. impact type | 26.6 16.7 | 2240 2080 | Cr13 Cr13 |
Gezhou Dam waterpower plant | 00Cr13Ni5Mo 0Cr13Ni5Mo |