“The demonstration project for the localization of the four major pipelines of the ultra-supercritical thermal power unit is currently in progress. The pipeline will be completed in the near future and will be installed on site.†The power plant metal held in China Power Science and Technology Network from September 3 to 4 At the 2013 annual meeting on materials and welding technology, a member of the joint R&D team of the National Four Major Pipeline Localization Demonstration Project of the Ultra-supercritical Thermal Power Unit of the National Energy Administration briefed the reporter of “China Power Newsâ€. According to the plan, the demonstration power plant will be put into commercial use by the end of this year. The operation and demonstration project will enter the pipeline in service supervision stage.†The localization of the four major pipelines of the ultra-supercritical thermal power unit is an important symbol for the ultra-supercritical coal-fired power generation unit to fully realize localization. Under the auspices of the National Energy Administration, according to the spirit of the localization work conference of the four major pipelines of ultra-supercritical thermal power units in November 2010, power companies, steel pipe manufacturing companies, and thermal engineering institutes jointly established and established “1 million kilowatts of ultra-supercritical thermal power units. The joint research and development team of the four national pipeline demonstration projects jointly committed to promoting the localization of the four major pipelines of ultra-supercritical units.
In recent years, the localization of ultra-supercritical coal-fired power generation technology has accelerated, the ultra-supercritical power generation technology at 600 degrees Celsius has continued to deepen, and the 700 degrees Celsius ultra-supercritical power generation technology roadmap has been drawn up. The overall efficiency of coal-fired power generation continues to increase.
Ultra-supercritical development of "12th Five-Year" coal-fired power generation
“The number of ultra-supercritical 600 degree Celsius units that have been put into operation in China has reached 100, with more than 80 million kilowatts, ranking first in the world in terms of volume and total capacity.†At the 2013 annual meeting of the metal materials and welding technology of thermal power plants, Wuzhi Group Zhongman Power Gao Peichang, Chairman of Pipeline (Tianjin) Co., Ltd., told the “China Power News†reporter that “China is the largest producer and user of ultra-supercritical unitsâ€. In recent years, Wuzhi Group Zhongman Power Pipeline (Tianjin) Co., Ltd. has been devoted to the development and technological development of ultra-supercritical unit materials. They cooperated with a power plant to develop the fittings for manufacturing and processing A335 and P91 materials for 1 million kilowatts of ultra-supercritical units. The test results of various scientific and technical indicators of various professional organizations are all qualified. The technical appraisal committee composed of many domestic authorities has The scientific research results were technically appraised.
In the 1990s, China’s power sector began to introduce advanced 600-degree supercritical units abroad. The first domestic ultra-supercritical 600 degree Celsius unit was put into operation at Huaneng Yuhuan Power Plant on November 28, 2006. Huaneng Group Corporation adopted Huaneng Yuhuan Power Plant 600 degrees Celsius million kilowatts of ultra-supercritical coal-fired units as the project to rely on projects. It has for the first time put forward the technical selection scheme for the development of ultra-supercritical thermal power units in China.
Up to now, in terms of ultra-supercritical power generation, China has already had the foundation and capability to manufacture generator sets of 1 million kilowatts, 25 megapascals, and 600 degrees Celsius.
“Ultra-supercritical†has become the key word for the “12th Five-Year†coal-fired power generation field. From the annual meeting of the annual meeting of the metal materials and welding technology of thermal power plants, more and more experts and scholars are discussing and discussing the technical issues of ultra-supercritical. "Wei Chen, CEO of China Power Science and Technology Network, told the "China Power News" reporter.
Metal material is the key to the development of ultra-supercritical
“The key to the development of ultra-supercritical thermal power generating units is the research and development of high-temperature metal materials and their welding technologies.†said Yang Fu, chairman of safety production experts and thermal power plant metal materials and welding technology exchange 2013, who had worked in the former Ministry of Power for many years. .
“As far as China’s ultra-supercritical thermal power units are currently used and under construction, high temperature important parts of metal materials use imported materials. In order to reduce the cost of the cost, we should speed up the research and development of imported pipe localization technology and put a lot of investment into the new units. The experts of Shenhua Guoneng Group Technology Research Institute told the reporter of “China Electric Power News†that “the new type of heat-resistant steel adopted by the ultra-supercritical thermal power unit is the key to the safe operation of the unit, and only a large number of new steel materials can be used as quickly as possible. Leading-edge information such as welding technology can better guarantee the safety and stability of the unit.†Cheng Shichang, Institute of Structural Materials, China Iron and Steel Research Institute, is an authoritative expert in the research of ultra-supercritical power generation technology for many years. He said at the above meeting: “The temperature of 600 degrees C Supercritical units are technologies that are purchased at high prices from foreign companies, and there are intellectual property rights, that is, each unit that produces one must pay a high price to a foreign company, and the export and sales of the unit must be approved by a foreign company, which seriously affects the 600 degrees Celsius in China. The production and sales of critical units have objectively constrained our economic development. . "According to the reporter, the key material ultra-supercritical 700 degrees Celsius, the current mainstream nickel-based super alloys, since 1998, the European super nickel alloys for this had already been more than 100,000 hours of simulation. At present, China does not have the ability to manufacture super-nickel-based alloys and is still in the research and development stage.
“The application of super nickel base alloy in coal-fired units is a systematic project and requires good cooperation in the metallurgical industry, boiler manufacturing industry and power industry,†said Xie Xishan, authoritative expert of high-temperature alloys in China and professor at the Institute of High-temperature Alloys, Institute of Metal Research, Beijing University of Science and Technology. Mechanism." On December 1, 2012, the "600 degree Celsius ultra-supercritical coal-fired unit steel pipe research and development and application" project passed the scientific and technological achievements appraisal, China's 600 degrees Celsius ultra-supercritical thermal power unit steel pipe technology from scratch, and leapt to the international Advanced level. The successful implementation of the technology of this project has effectively supported the self-construction of the ultra-supercritical coal-fired power unit with 600 degrees Celsius in China.
It will take some time for the "700 degrees Celsius" plan to be realized
Since 2010, China has started the research of 700 degrees Celsius ultra-supercritical coal-fired power generation technology. On July 23, 2010, the National Energy Administration held the launching ceremony of the “National 700 Degree Celsius Supercritical Coal-fired Power Generation Technology Alliance†and set up four special working groups to conduct related research.
Almost at the same time, the National Science and Technology Ministry's 863 project "Development of Critical Boiler Pipes for Advanced Ultra-Supercritical Thermal Power Units" has also begun its planning.
A reporter from China Electric Power reported that, from an international perspective, there are currently no mature materials that can meet the design requirements for ultra-supercritical coal-fired power plants at 700 degrees Celsius. It has been more than 10 years since the European, U.S., and Japanese studies on ultra-supercritical projects at 700 degrees Celsius have been conducted. Especially in Europe, the 700 degree Celsius ultra supercritical plan has been implemented for more than 10 years. Due to the main steam tube testing at 700 degrees Celsius for approximately 22,400 hours, the test is delayed due to the occurrence of ring cracks in the welded joint.
Another challenge is high material costs. The cost of special materials for ultra-supercritical units at 700 degrees Celsius currently researched is as high as 800,000 yuan per ton. The cost of a boiler from today's 400 to 45 billion yuan has soared to 20 billion yuan. Is this development operational? Have to question! "Currently developing the 625-degree Celsius ultra-supercritical unit in China is not only a necessity but also an inevitable trend for the development of thermal power units." Cheng Shichang said, "The 625-degree Celsius ultra-supercritical unit is just our name, not an accurate parameter range, it is a The general term for the parameters of ultra-supercritical units that are now 600 degrees Celsius." It is understood that each power generation group and design unit has started the design of the relevant parameters for the 625-degree Celsius ultra-supercritical unit, and the number of units contracted with the boiler plant has reached 20 units.
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