초초임계압 화력발전소의 고온화에 수반되는 재료문제 해결방안

다국어 초록 (Multilingual Abstract)

The USC program of 700℃ classes launched in Europe, USA, and Japan has been reviewed. The targeted steam conditions were 379bar/760℃/760℃(45.2% efficiency) and 380bar/700℃/720℃/720℃(55% efficiency) in the VISION21 of USA and the THERMIE program(AD 700) of Europe, respectively. There were research programs to develop and evaluate new materials and innovative conceptual design for boiler and turbine. Candidate materials for service at higher temperature above 700℃ should be endowed with the creep rupture strength above 100㎫, good fabricability, higher resistance to high temperature corrosion and steam oxidation, higher thermal fatigue strength, and viable costs. Various materials, austenitic stainless steels like HR6W and Ni-base superalloys like IN617, IN740, KCN, and Haynes 230, were introduced and reviewed. For Ni-base superalloys, creep rupture strength at temperature satisfied sufficiently the requirement. However, the manufacturing and fabrication of large products such as pipe, rotor, and casing with thick-walled section required much additional R&D effort to get fully characterized components. It is generally believed that commercialization of USC plant of 700℃ classes in the future strongly depends on the guarantee of economical efficiency realized by the development of cheaper materials and the innovative design to minimize the usage of Ni-base superalloy.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 연구동향
• 3. 고온화에 수반되는 재료의 요구특성
• 4. 보일러용 재료
• 5. 터빈용 재료
• 6. 결론
• 참고문헌