Heat-and-Mass Transfer Intensification in Saturated-Steam Generators in NPP with VVER as a Means for Increasing Efficiency and Reliability

Agafonova, N. D.; Egorov, Mikle; Сергеев, В. В.; Gotovskii, M. A.; Kruglikov, P. A.; Lebedev, Maxim; Sudakov, A. V.; Fedorovich, E. D.; Fokin, B. S.

doi:10.1007/s10512-018-0317-5

Cited by 17 publications

(12 citation statements)

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“…Calise et al [6] and Manente et al [8] proposed ORC part-load operation in-house analysis tools. In interesting fact is that different approaches are implemented by different authors in terms of expander part-load performance, which corroborates that one-size-fits-all solution does not exist and further investigations are still relevant [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 79%

Thermodynamic analysis of design and part-load operation of a novel waste heat recovery unit

et al. 2018

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Organic Rankine Cycle (ORC) thermodynamic optimization is of critical importance while developing new plants. Optimization procedures may be imed at the highest efficiency as well as cost or sizing minimization. Optimization process is generally carried out for plant nominal rating. At the same time, part-load operation has to be carefully considered in case of waste heat recovery from flue gases coming from internal combustion engines or gas turbines. Gas mass flow and temperature variations are specific to this application, significantly influencing ORC plant performance. Secure prediction of part-load operation is of particular importance for assessment of plant power output, providing stability and safety and utilizing proper control strategy. In this paper design and off-design cycle simulation model is proposed. Off-design performance of the ORC cycle recovering waste heat from gas turbine unit installed at gas compressor station is considered. Major factors affecting system performance are outlined.

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Section: Introductionmentioning

confidence: 79%

Thermodynamic analysis of design and part-load operation of a novel waste heat recovery unit

et al. 2018

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“…Design of vertical single-phase pre-boiling steam generator allows organizing the so-called separate section, i.e. the heat exchanger for heating feed water to saturation temperature (Agafonova et al 2017). This allows increasing average temperature difference in the equipment (Fig.…”

Section: Application Of Two-stage (Chevron and Swirl-vane)mentioning

confidence: 99%

Vertical steam generators for VVER NPPs

Egorov

2019

NUCET

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Steam generators for NPPs are the important large-sized metal consuming equipment of nuclear power installations. Efficiency of steam generator operation determines the overall service life of the whole nuclear facility. The main aim of the current study is to analyze advantages and shortcomings of horizontal and vertical types of steam generator design. This analysis is aimed at the development of recommendations for designing advanced steam generators for future Russian units of NPPs with VVER reactors of increased power. Design solutions and fifty-year experience of operation of 400 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. Advantages and drawbacks of both types of equipment determining the development of conditions of the operating processes were also identified and systematized. Currently NPPs equipped with VVER are characterized with extended surface area of containment shells due to the application of four-loop design configuration and horizontal-type steam generators. It was established that steam generator equipment of horizontal type is characterized by such inherent disadvantages of design, technological and operational nature as the following: 1) small height and volume of the vapor space above the evaporation surface reducing separation capabilities and the capacity of the equipment as a whole; 2) impossibility of organizing separate single-phase pre-boiling section. Because of the above, 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 were as follows: 1) absence of stagnant zones within the second cooling circuit, and, consequently, of hold-ups in them; 2) uniformity of heat absorption efficiency of the heating surface ensuring, as well, improved conditions for moisture separation; 3) high degree of moisture removal from steam-water mixture due to the combination of moisture separating elements of chevron and swirl-vane types; 4) 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. Practical tasks that need to be addressed in order to ensure introduction of vertical steam generators at NPPs with high-power VVER reactors were formulated.

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“…The world experience shows that more and more electric energy is required for the sustainable development of society in various directions every year. Especially it is required in industry, services and personal life [1][2][3][4][5][6][7]. It happens against the background of a decrease in stocks of various types of fuel and environmental degradation [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional method for remote monitoring of the environment in the area of nuclear facilities

Давыдов

Fadeenko

et al. 2019

E3S Web Conf.

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In a paper the method for remote monitoring of the radiation characteristics of the environment in the area of the nuclear power plant is considered. To solve this problem, the need to use remote methods of environmental monitoring is justified A method is proposed for determining radioactive formations in the atmosphere using a radar station. Using the methodology for determining radioactive formations in the atmosphere by changing the reflection coefficient of an electromagnetic wave from a given formation is justified. Calculation of changes in the reflection coefficient of an electromagnetic wave from a radioactive formation in the atmosphere for different climatic conditions is calculated. The results of studies of radioactive contamination in the atmosphere are presented. The advantages of the method developed by us in comparison with others are noted. The directions of scientific research to expand the functionality of the method developed by us are determined.

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Heat-and-Mass Transfer Intensification in Saturated-Steam Generators in NPP with VVER as a Means for Increasing Efficiency and Reliability

Cited by 17 publications

References 0 publications

Thermodynamic analysis of design and part-load operation of a novel waste heat recovery unit

Thermodynamic analysis of design and part-load operation of a novel waste heat recovery unit

Vertical steam generators for VVER NPPs

Multifunctional method for remote monitoring of the environment in the area of nuclear facilities

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