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In order to adapt to the harsh service environment of 700 ℃ advanced ultra-supercritical coal-fired power generation unit (700 ℃ A-USC), and facilitate the development of high efficiency, low consumption and low carbon coal-fired power generation technology, high temperature superalloy will be used to manufacture the high-temperature components in boiler and turbine. Many countries and regions such as the United States, Europe, China, Japan and India have put forward research plans of 700 ℃ A-USC technology with national characteristics, respectively. Due to the variety of elements, high welding difficulty, and high tendency to produce welding defects in high-temperature alloys, welding technology and weld joint comprehensive performance evaluation technology have a significant influence on the factory manufacturing, on-site processing and repair, as well as service safety and integrity of high-temperature components. The current progress in practical application of the 700 ℃ technology at home and abroad is slow, which is mainly due to incomplete resolution of technical barriers such as manufacturing, connection, and testing. The research plans and development prospects of the 700 ℃A-USC technology around the world are summarized. The material selection of high temperature components including the boiler side and the turbine side is discussed. The current status, advantages and disadvantages of the welding technology for superalloy are summarized, and the critical focus points of the joint comprehensive properties evaluation technology for high temperature components are analyzed. Finally, some suggestions on developing the 700 ℃ A-USC technology are put forward.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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