"Ultra-supercritical thermal power unit pipeline localization of the four major projects are currently under way, the pipeline will be completed in the near future preparation of the factory, the site installation." September 3 ~ 4 held in the thermal power plant metal materials and welding technology Exchange 2013 meeting, the National Energy Administration ultra-supercritical thermal power unit pipeline localization of four major domestic project demonstration team members told reporters, "According to the plan, the demonstration plant will be put into commercial operation by the end of this year, the demonstration project will enter the pipeline in service Supervision stage. "The ultra-supercritical thermal power unit of the four major domestic pipe is the ultra-supercritical thermal power unit to achieve an important symbol of localization. Under the auspices of the National Energy Administration, according to the spirit of the four super-critical thermal power units in China in November 2010, electric power enterprises, steel pipe manufacturing enterprises and thermal research institutes jointly set up a "one million kilowatt ultra-supercritical thermal power unit Four domestic pipeline demonstration project "joint R & D team, work together to promote ultra-supercritical unit of the four pipelines localization.
In recent years, the process of domestication of ultra-supercritical coal-fired power generation technology has been accelerated. The ultra-supercritical power generation technology of 600 degrees Celsius has been deepening. The roadmap of ultra-supercritical power generation technology of 700 degrees Celsius has been painted and the overall efficiency of coal-fired power generation has been continuously improved.
Ultra-supercritical as a "second five" coal-fired power generation development
"China has put into operation 600 degrees Celsius ultra-supercritical units up to 100 units, more than 80 million kilowatts, the number and total capacity ranking first in the world." In thermal power plant metal materials and welding technology exchange 2013 annual meeting, Fingers Zhongman Power Pipeline (Tianjin) Co., Ltd. Chairman Gao Pei-long told reporters, "China is the largest producer of ultra-supercritical units, the use of the country." In recent years, the Five Fingers Group, Man Power Pipeline (Tianjin) Co., Ltd. has been committed to the development of ultra-supercritical unit materials and technology development. They worked with a power plant to develop 1 million kilowatts of ultra-supercritical units A335, P91 material manufacturing and processing of pipe fittings, different professional institutions on the product of the technical indicators test results are qualified, the domestic authority of a number of technical appraisal committee The scientific research conducted technical appraisal.
90s of last century, China's power sector began to introduce advanced foreign 600 degrees Celsius ultra-supercritical units. Domestic first 600 degrees Celsius ultra-supercritical unit on November 28, 2006 put into operation in Huaneng Yuhuan plant. Huaneng Group Huaneng Yuhuan Power Plant 600-degree Cillion kilowatts ultra-supercritical coal-fired units as a project relying on the project for the first time in China put forward the development of ultra-supercritical thermal power plant technology selection program.
Up to now, China has the foundation and capacity to manufacture 1,000,000-watt, 25-megapascal and 600-degree Celsius power generation units in ultra-supercritical power generation.
"Ultra-supercritical" has become the key word in the field of coal-fired power generation in the 12th Five-Year Plan period.From the previous annual exchange of metal materials and welding technology in thermal power plants, more and more experts and scholars are discussing the technical issues of ultra-supercritical "Insiders Wei Yu Pu reporter introduced Road.
Metal materials are the key to the development of ultra-supercritical
"The key to the development of ultra-supercritical thermal power units is the research and development of high-temperature metal materials and their welding technology." Yang Fu, Chairman of the 2013 Annual Meeting of Safety Production Experts and Thermal Power Plant Metal Materials and Welding Technologies, who had worked in the Ministry of Electric Power for the past few years, .
"At present, China's investment and the construction of ultra-supercritical thermal power units, high temperature important components of metal materials are used imported materials.In order to reduce the cost of the cost, we should speed up the development of imported pipe production technology, and a large number of investment in new units . "Shenhua Guoneng Group Technical Research Institute, an expert told reporters that" the new ultra-supercritical thermal power unit is the key to the safe operation of the unit, only a large number of new steel as soon as possible to grasp the cutting edge of the characteristics of the use of steel and welding processes , In order to better protect the safety and stability of the unit. "Institute of Structural Materials, China Iron and Steel Research Institute Cheng Shichang years of super-critical power generation technology research expert, he said at the meeting:" 600 degrees Celsius ultra-supercritical unit is high There are intellectual property rights to the technology purchased from a foreign company, that is, every unit producing a unit must pay a high fee to a foreign company for the unit's export sales to be approved by a foreign company, seriously affecting the production of 600-degree Celsius ultra-supercritical units in China and Sales, objectively restricted our economic development. "According to reporters 700 degrees ultra-supercritical key materials, 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 manufacturing capacity of super nickel-based alloys, is still in the exploration and development stage.
Xie Xishan, authoritative expert of domestic superalloy and professor of superalloy research institute, Institute of Metal Research, University of Science and Technology Beijing said: "The application of super nickel-based alloys in coal-fired units is a systematic project and requires good cooperation in metallurgical industry, boiler manufacturing industry and power industry Mechanism. "December 1, 2012," 600 Celsius ultra-supercritical thermal power unit with steel pipe research and application of "project through the identification of scientific and technological achievements, China's 600 degrees Celsius ultra-supercritical thermal power unit with steel pipe technology from scratch, and leapt to international Advanced level. The successful implementation of the project technology has effectively supported the construction of our country's 600-degree Celsius ultra-supercritical thermal power units.
"700 degrees Celsius" plan to take time to take
Since 2010, our country has started the research of ultra-supercritical coal-fired power generation technology at 700 degrees Celsius. On July 23, 2010, the National Energy Administration held the launching ceremony of the "National Technical Union of Ultra-supercritical Coal-fired Power Generation at 700 Degrees Celsius". Four special working groups were set up to carry out related research.
Almost the same time, the National Science and Technology 863 project "advanced ultra-supercritical thermal power unit boiler development" project also began planning.
Reporters learned that, from an international perspective, there is no mature material to meet the design requirements of 700 degrees Celsius ultra-supercritical coal-fired power station. Europe, the United States, Japan for 700 degrees Celsius Ultra-supercritical project has been more than 10 years. Especially in Europe, the ultra-supercritical program at 700 ° C has been in operation for more than 10 years. Due to the trial of about 22400 hours at 700 ° C for the main steam pipe, the project is postponed due to annular cracks in the welded joints.
Another problem is the high material costs. The current research of 700 degrees Celsius ultra-supercritical units of special materials cost as much as 800,000 yuan per ton, a boiler from the current cost of 40 to 4.5 billion yuan jumped to 20 billion yuan, this development is operational, but also It is not only necessary 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 , Which is a general term for the parameters of ultra-supercritical units above 600 degrees Celsius. " It is understood that the power generation groups and design units have begun the 625 degrees Celsius ultra-supercritical unit-related parameters of the design, signed a contract with the boiler plant has reached 20 units.
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