Six key valve prototypes of the most popular nucle

Six prototypes of key valves of CNNC suvalve ultra (ultra) critical thermal power units have been successfully developed.

recently, at the localization prototype appraisal meeting of key valves of ultra (ultra) critical thermal power units, CNNC suvalve science and Technology Industry Co., Ltd. developed "high exhaust check valve", "extraction check valve", "pneumatic control valve of air preheater soot blowing and pressure reduction station", "boiler superheater spray control valve", "high pressure heater accident drain control valve" "All projects of feed pump steam turbine have achieved successful pilot production of exhaust butterfly valve of machine" and other six prototypes have unanimously passed the appraisal committee. The technical raw materials should be imported from the United States for appraisal. Recently, at the localization prototype appraisal meeting of key valves of ultra (supercritical) thermal power units, six prototypes developed by CNNC suvalve Technology Industry Co., Ltd., including high-pressure exhaust check valve, extraction check valve, pneumatic control valve of air preheater soot blowing and pressure reduction station, boiler superheater spray control valve, high-pressure heater accident drainage control valve, and feed pump turbine exhaust butterfly valve, unanimously passed the technical appraisal of the appraisal committee. This marks that the design and manufacturing technology of CNNC suvalve has achieved a historic leap forward in that it does not degrade within 2a in phosphate buffer (ph=7.4), which not only improves the performance parameters of valves used in domestic corresponding systems and pipelines, narrows the gap with foreign advanced technology, meets the needs of domestic thermal power units for large-scale and high parameter development, but also ends the technological monopoly and product monopoly of foreign large valve enterprises on this valve

entrusted by the national energy administration, China General Machinery Industry Association has identified six prototypes. The experts attended the meeting listened to the introduction of the development work report, technical summary report, inspection and test report and product performance test witness of CNNC SUV on the six prototypes, reviewed the relevant identification data, and after careful discussion, they finally agreed that the structural design of the three prototypes of the pneumatic control valve of the soot blowing and pressure reducing station of the air preheater, the water spray control valve of the boiler superheater and the accident drain control valve of the high pressure heater is reasonable and meets the requirements of the R & D technical specifications, Filling the domestic gap, its main technical performance indicators have reached the domestic advanced level of similar products; The structure design of the three prototypes of the exhaust butterfly valve, high exhaust check valve and extraction check valve of the feed pump turbine is reasonable, which meets the requirements of the R & D technical specifications and fills the domestic gap. Its main technical performance indicators have reached the domestic leading level of similar products, and it is unanimously agreed that the six prototypes have passed the technical appraisal

it is understood that the boiler, steam turbine and generator of China's large-scale thermal power unit equipment have been fully able to independently design and manufacture through the decentralized action machine, but the design and manufacturing level of power station auxiliary equipment, especially high-end valves, is still in the blank stage. According to statistics, there are about 500 high-end valves in a 1000MW ultra (ultra) critical thermal power unit, 90% of which depend on imports. Therefore, the localization of ultra (ultra) critical high-end valves is of great significance to realize the independent development of energy industry and enhance the competitiveness of equipment manufacturing industry

according to the spirit of the 12th Five year national energy development plan and the relevant documents of national energy science and technology, in order to realize the localization of key valves of ultra (ultra) critical thermal power units, the national energy administration, China Machinery Industry Federation and China General Machinery Industry Association clearly signed a joint R & D agreement on the localization of key valves of ultra (ultra) critical thermal power units with 17 domestic valve enterprises based on Nantong Power Plant and other five power plants in April 2011. With the advantages of advanced technology, independent innovation, perfect quality assurance system, advanced production and inspection equipment, CNNC suvalve has signed a development plan for a total of 6 prototypes, including extraction check valve, high-pressure heater accident drain control valve, high-pressure exhaust check valve, boiler superheater spray water control valve, air preheater soot blowing and pressure reduction station pneumatic control valve, and feed pump turbine exhaust butterfly valve. (Zhang Li)

attachment: what is supercritical (supercritical)

ultra (supercritical) units and supercritical units in thermal power plants refer to the pressure of working medium in boilers. The working medium in the boiler is water, and the critical pressure of water is 22.115mpa or 347.15 ℃. At this pressure or temperature, the density of water and steam is the same, which is called the critical point of water. When the steam temperature in the furnace is not lower than 593 ℃ or the steam pressure is not lower than 31mpa, it is called ultra (ultra) critical

supercritical and ultra (ultra) supercritical thermal power units have significant energy-saving and environmental improvement effects. Compared with supercritical units, the thermal efficiency of ultra (ultra) supercritical units is increased by 1.2%, and 6000 tons of high-quality coal can be saved a year. The future thermal power construction will mainly focus on the development of high-efficiency and high parameter supercritical (SC) and ultra supercritical (USC) thermal power units, which have been widely studied and applied in developed countries