Abstract
High efficiency pulverized coal power plant technology, especially the system design for high temperature turbines, is discussed. It is believed that a 700-deg C class steam turbine system will be realized with Ni-based super alloys. The super alloys are more expensive than current materials like 12%Cr steels though its high temperature strength is excellent. In addition, the size of the alloys is limited for the current design because the quality of large Ni alloys is not high enough. Therefore, it is necessary to study new design concepts to utilize the alloys. The key concept is the optimized combination of steam turbine cooling and the super alloys. By adopting cooling to all turbines, it becomes possible not to use the super alloys for the turbines except valves, and relative thermal efficiency reduction from the system without cooling is 0.4%. If reheat turbines are cooled, the relative thermal efficiency reduction from the system without cooling is only 0.2% though it is necessary to use the super alloys for VHPT (Very High Pressure Turbine).
| Original language | English |
|---|---|
| Pages (from-to) | 2570-2577 |
| Number of pages | 8 |
| Journal | Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 72 |
| Issue number | 10 |
| Publication status | Published - 2006 Oct |
| Externally published | Yes |
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Keywords
- Boiler
- Fossil fuel fired power generation
- Steam turbine
ASJC Scopus subject areas
- Mechanical Engineering
Cite this
System evaluation for high temperature ultra supercritical steam power plants. / Fukuda, Masafumi; Sato, Haruki.
In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 72, No. 10, 10.2006, p. 2570-2577.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - System evaluation for high temperature ultra supercritical steam power plants
AU - Fukuda, Masafumi
AU - Sato, Haruki
PY - 2006/10
Y1 - 2006/10
N2 - High efficiency pulverized coal power plant technology, especially the system design for high temperature turbines, is discussed. It is believed that a 700-deg C class steam turbine system will be realized with Ni-based super alloys. The super alloys are more expensive than current materials like 12%Cr steels though its high temperature strength is excellent. In addition, the size of the alloys is limited for the current design because the quality of large Ni alloys is not high enough. Therefore, it is necessary to study new design concepts to utilize the alloys. The key concept is the optimized combination of steam turbine cooling and the super alloys. By adopting cooling to all turbines, it becomes possible not to use the super alloys for the turbines except valves, and relative thermal efficiency reduction from the system without cooling is 0.4%. If reheat turbines are cooled, the relative thermal efficiency reduction from the system without cooling is only 0.2% though it is necessary to use the super alloys for VHPT (Very High Pressure Turbine).
AB - High efficiency pulverized coal power plant technology, especially the system design for high temperature turbines, is discussed. It is believed that a 700-deg C class steam turbine system will be realized with Ni-based super alloys. The super alloys are more expensive than current materials like 12%Cr steels though its high temperature strength is excellent. In addition, the size of the alloys is limited for the current design because the quality of large Ni alloys is not high enough. Therefore, it is necessary to study new design concepts to utilize the alloys. The key concept is the optimized combination of steam turbine cooling and the super alloys. By adopting cooling to all turbines, it becomes possible not to use the super alloys for the turbines except valves, and relative thermal efficiency reduction from the system without cooling is 0.4%. If reheat turbines are cooled, the relative thermal efficiency reduction from the system without cooling is only 0.2% though it is necessary to use the super alloys for VHPT (Very High Pressure Turbine).
KW - Boiler
KW - Fossil fuel fired power generation
KW - Steam turbine
UR - http://www.scopus.com/inward/record.url?scp=33846524216&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33846524216&partnerID=8YFLogxK
M3 - Article
VL - 72
SP - 2570
EP - 2577
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 10
ER -