Heat transfer upon motion in the channel of a dispersed water-steam flow

Agafonova, N. D.; Paramonova, I. L.

doi:10.1134/s0040601514080011

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…Coordination of the above tasks can be performed by the group of experts [26][27][28][29][30] representing design bureaus and research institutes and production facilities manufacturing heat exchange equipment for NPPs.…”

Section: Discussionmentioning

confidence: 99%

Russian and foreign steam generators for NPP power units with wet steam turbines

et al. 2020

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The main aim of the current study is to analyze advantages and shortcomings of horizontal and vertical types of steam generator design. Design solutions and experience of operation of steam generators of horizontal type accepted in Russia and of vertical type applied by Westinghouse, Combustion Engineering, Siemens, Mitsubishi, Doosan were analyzed within the framework of the present study. It was established that steam generator equipment of horizontal type is characterized by disadvantages of design, technological and operational nature. Thus, horizontal steam generators with dimensions permissible for railroad transportation and, for VVER-1200 with reactor vessel diameter equal to 5 m, by water transport as well, have exhausted the possibilities for further significant increase of the per unit electric power. The demonstrated advantages of vertical-type steam generators are as follows: 1) absence of stagnant zones within the second cooling circuit; 2) uniformity of heat absorption efficiency of the heating surface that ensures improved conditions for moisture separation; 3) increased temperature drop with parameters of generated steam elevated by 0.3 – 0.4 MPa. Conclusion was made on the advisability of introduction of steam generators with vertical-type layout in the Russian nuclear power generation.

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Section: Discussionmentioning

confidence: 99%

Russian and foreign steam generators for NPP power units with wet steam turbines

et al. 2020

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“…In gas-and-gas heat exchangers with low external heat output and high values on the inner surface of pipes, use of thermosyphon slightly increases the overall surface compared to traditional heat exchangers [7]. In this case, temperature of the pipes is close to the saturation temperature of two-phase medium in the thermosyphon and is practically the same in length [8][9][10][11]. By varying the ratio of the lengths of the heating and cooling zones, it is possible to vary this temperature in the range between the temperatures of the heatexchanging gaseous media.…”

Section: Introductionmentioning

confidence: 94%

High-temperature service life tests of full-size thermosyphons

Balunov¹,

Egorov

2019

E3S Web Conf.

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During past two decades, at temperature 240-265°C, resource tests were carried out on 19 thermosyphons of full-scale sizes: 45х4 mm in diameter, 4.92 m in length. The thermosyphons were prepared with varying preliminary surface treatment methods, composition of the aqueous solution to be poured into the thermosyphons, location of titanium chips in the perforated capsules under the lid of the thermosyphons. With a period of 1 to 3 years, thermosyphons were removed from testing system for 30 hours to control the vacuum by thermal method that does not require depressurization. At the last control experiment, four thermosyphons are depressurized for the following purposes: to check the condition of their internal surface in different zones along the length; for the chemical analysis of the aqueous solution poured from them; to determine the structure and characteristics of the mechanical properties of the thermosyphon metal. The main aim of the tests is to justify maintaining the structure and mechanical properties of the metal for a long time, keeping a vacuum of 90-95% inside the thermosyphon, ensuring high heat transfer characteristics of the boiling operating mode of thermosyphons.

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“…At the initial period of devices design, naturally, there was no their long-term operation experience. Moreover, many features of the medium flow processes, heat and mass transfer in them had not been sufficiently studied [7][8][9][10]. They were investigated only on smallscale models and did not take into account the scale factor, the geometry specifics of the systems and moisture separation and reheating processes [11][12][13][14][15][16][17].…”

Section: Some Thermal-hydraulic Processes Features In Msr Revealed During Their Operationmentioning

confidence: 99%

The new ways to increase the efficiency of thermal hydraulic processes in systems of separation and reheating of NPP wet steam turbines

et al. 2020

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Systems of moisture separators - reheaters (SMSR) were created simultaneously with the powerful turbines development of nuclear power plants operating on a wet steam from the early 60s of the 20th century. This lengthy experience made the opportunity to identify the moisture separators - reheaters (MSRs) drawbacks, to determine the objectives for their design and computation improvement in order to increase thermodynamic efficiency, MSR devices and MSR systems reliability in general. Based on maintenance experience and results of our and other researchers’ model and field studies this article discusses potential ways of further development and improvement, taking into consideration both SMSR components (separation and reheating) under conditions of their flow in one apparatus.

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Heat transfer upon motion in the channel of a dispersed water-steam flow

Cited by 5 publications

References 3 publications

Russian and foreign steam generators for NPP power units with wet steam turbines

Russian and foreign steam generators for NPP power units with wet steam turbines

High-temperature service life tests of full-size thermosyphons

The new ways to increase the efficiency of thermal hydraulic processes in systems of separation and reheating of NPP wet steam turbines

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