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Gladshtein V.I.,All Russia Thermal Engineering Institute
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

Comparative assessment of the effect the yield strength has on the characteristics of EI-415 steel under creep conditions is carried out based on the results from long-term (for more than 70000 h) tests of notched samples at an elevated temperature. The metal of three rotors (EI-415 steel) (one after it had been in operation for 137000 h and the other two in the delivery state with relatively increased and decreased levels of yield strength) was used as material under study. The notch sensitivity was evaluated from the ratio between the long-term strength of smooth samples and that of notched samples tested for long-term strength with recording the crack opening width. The resistances to crack incipience and to crack growth with a preset rate were determined from the lengths of cracks appeared at the end of two auxiliary notches of a smaller depth, and the creep fracture toughness was calculated from the break conditions. It is shown that the metal the properties of which are at the lower boundary of yield strength requirements is slightly more advantageous in the level of the above-mentioned characteristics. © 2014 Pleiades Publishing, Inc. Source


Ol'Khovskii G.G.,All Russia Thermal Engineering Institute
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

In combined-cycle units that have been commissioned within recent years at Russian thermal power stations, up-to-date models of high-capacity (from 260 to 290 MW) power gas turbine units (GTUs) were installed. In their schematic diagrams and designs some engineering solutions unusual for domestic practice have been implemented. In the course of tests carried out under operating conditions, there have been obtained high efficiencies of both GTUs themselves (from 36 to 39%) and their turbine machines: compressors and turbines, low design NO x emissions at operating loads, and favorable performance characteristics in a wide range of loads and environmental conditions. © 2014 Pleiades Publishing, Inc. Source


Gladshtein V.I.,All Russia Thermal Engineering Institute
Thermal Engineering (English translation of Teploenergetika) | Year: 2011

The postulated analogy between the influence on longevity of a relatively high extent of creep-caused microdamage and initial decrease in a sample's cross section due to annular notch is used as a basis for carrying out an experimental study of the effect of temperature, stress, and loading time on the coefficient characterizing the relative residual longevity of metal after the occurrence of pore chains along the grain boundaries. © 2011 Pleiades Publishing, Ltd. Source


Ol'Khovskii G.G.,All Russia Thermal Engineering Institute
Thermal Engineering (English translation of Teploenergetika) | Year: 2013

The modern state of technology for making gas turbines around the world and heat-recovery combined-cycle units constructed on their basis are considered. The progress achieved in this field by Siemens, Mitsubishi, General Electric, and Alstom is analyzed, and the objectives these companies set forth for themselves for the near and more distant future are discussed. The 375-MW gas turbine unit with an efficiency of 40% produced by Siemens, which is presently the largest one, is subjected to a detailed analysis. The main specific features of this turbine are that the gas turbine unit's hot-path components have purely air cooling, due to which the installation has enhanced maneuverability. The single-shaft combined-cycle plant constructed on the basis of this turbine has a capacity of 570 MW and efficiency higher than 60%. Programs adopted by different companies for development of new-generation gas turbine units firing synthesis gas and fitted with low-emission combustion chambers and new cooling systems are considered. Concepts of rotor blades for new gas turbine units with improved thermal barrier coatings and composite blades different parts of which are made of materials selected in accordance with the conditions of their operation are discussed. © 2013 Pleiades Publishing, Ltd. Source


Ol'khovskii G.G.,All Russia Thermal Engineering Institute
Thermal Engineering (English translation of Teploenergetika) | Year: 2015

In the review of the Conference on Gasification of Solid Fuels, which was held on October 2013 by the United States, the commercial use of the most advanced coal gasification systems in the chemical and power industry is considered. Data on the projects of integrated solid fuel gasification combined-cycle plants, either being developed or exploited in the United States, as well as the nature and results performed in specialized organizations to improve the existing gasification equipment and systems, are presented. © 2015, Maik Nauka-Interperiodica Publishing, all rights reserved. Source

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