Application of electro-spark coatings to increase the service life and operational reliability for blades and vanes of steam turbines at thermal and nuclear power plants. Description of the equipment for coatings application
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BELYAKOV, A., GORBACHEV, A., PARABIN, V.. Application of electro-spark coatings to increase the service life and operational reliability for blades and vanes of steam turbines at thermal and nuclear power plants. Description of the equipment for coatings application. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 339.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Application of electro-spark coatings to increase the service life and operational reliability for blades and vanes of steam turbines at thermal and nuclear power plants. Description of the equipment for coatings application


Pag. 339-339

Belyakov A., Gorbachev A., Parabin V.
 
Open joint-stock company, "All-Russian twice Order of Labor Red Banner, Thermal Engineering Research Institute"
 
 
Disponibil în IBN: 23 martie 2019


Rezumat

Operation of power equipment determines the impact of various factors leading to deterioration of its elements, which in turn determines the life and reliability of the power equipment in general. In this regard, the costs of replacing worn and unreliable elements not only inevitable, but also so great that the problem of increasing life and reliability elements energy equipment is very important and relevant. Steady increase in the capacity of power equipment determines the increase of operational parameters (specific load, pressure, speed, temperature, etc.), which further tightens the nature of the equipment and its components wear items.  Among the problems that are acute in thermal and nuclear power generation, it is the problem of erosive wear of input edges and trailing edges of the cavitations wear steam turbines. Elements of the flow in the form of work and guide vanes of steam turbines of thermal power plants are exposed to intensive abrasion oxide particles formed on the surface of the boiler and steam heating, welding and material "hail", formed in the process of steam power equipment repairs that fall in the flow part of a steam turbine flow. Given the intense impact on elements of the flow of the wet steam and abrasive particles, it is necessary to protect the use of elements of the flow of erosion and abrasion. Analysis of technological possibilities showed that promising in this direction is the way electro forming protective coatings at both the manufacturing elements of the flow of steam turbines, and the operational phase when carrying out various repairs. Meeting these challenges will require serious consideration of technological issues related to the development of powerful systems for electric-spark coating formation, the development of switching devices and general principles of the process to reduce the costs of repairs for steam turbines and the feasibility of the formation of protective coatings on the station equipment. As a result of experimental design and research works were created installation GBF-2M, GBF-3, 5-KGB KGB-5M, electromechanical vibrators, will provide two orders of resource electromagnetic vibrators. On the basis of the specified equipment was developed process of formation of protective coatings in the manufacturing process of the elements of a flowing steam turbines, as well as repairs carried out directly at the power units of thermal and nuclear power plants. The greatest achievement of the process is the ability to form a protective coating on the input and output edges of the working blades without removing the blade from the rotor.  Application of the process of formation of protective coatings has increased the resource blades high and medium pressure subjected to abrasion - 3 times, and the last stages of working blades - 80 - 150%. These processes are implemented on a lot of different types of turbines, both in Russia and abroad.