Abstract
The authors’ conception is presented of an integrated approach to reliability improving of the steam turbine unit (STU) state along with its implementation examples for the various STU technological subsystems. Basing on the statistical analysis of damage to turbine individual parts and components, on the development and application of modern methods and technologies of repair and on operational monitoring techniques, the critical components and elements of equipment are identified and priorities are proposed for improving the reliability of STU equipment in operation. The research results are presented of the analysis of malfunctions for various STU technological subsystems equipment operating as part of power units and at cross-linked thermal power plants and resulting in turbine unit shutdown (failure). Proposals are formulated and justified for adjustment of maintenance and repair for turbine components and parts, for condenser unit equipment, for regeneration subsystem and oil supply system that permit to increase the operational reliability, to reduce the cost of STU maintenance and repair and to optimize the timing and amount of repairs.
Highlights
According to [1], one of the main problems of modern and forthcoming activity of the electric power industry is a rapid increase of the equipment wearing out, which has already reached 60%
It is known that in order to improve the reliability of steam turbine units (STU) equipment under operating conditions a complex of works on repair and maintenance of equipment is accomplished, according to [2,3], and only in some particular cases the works are carried out for unreliable units modernization
This approach is aimed mainly at maintaining the equipment in serviceable condition and does not provide the necessary increase in reliability. This approach is applied to all types of equipment and it does not take into account the specific design and operating conditions of specific equipment
Summary
− analysis of design features of these parts and components in comparison with the design of similar equipment units of other standard sizes in operation;. − analysis of design features of these parts and components in comparison with the up-todate design of similar equipment units; the development of methods for improving the units of limited reliability: − analysis of the possibility of using known (employed on equipment of other standard sizes) design and technological solutions to improve the reliability of these units; − analysis of the possibility of applying of methods and technologies that are used in other branches of science and technology to eliminate similar problems; − new technical solutions, methods and technologies development; carrying out feasibility studies of planned activities; determination of priority directions for increasing the reliability of a particular steam-turbine plant in relation to its operating and repair conditions; for STU parts with structural defects:.
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