Operating Thermal Power Plants Efficiency Improvement under Current Conditions

In the present-day conditions, the issue of energy saving is becoming increasingly acute and permanently relevant. This situation is caused by rapid growth in prices for primary energy resources and by the need to reduce the share of natural gas in the incoming part of the energy balance of Belarus. According to available statistics, with the commissioning of the Belarusian NPP, the share of natural gas in the incoming part of the energy balance decreases from 97 to 59 %. In the economic complex, the share of this primary energy resource is projected at 70 %. The problem of energy saving is solved most rationally and with the least investment only by increasing the efficiency of natural gas use, especially due to the commissioning of the Belarusian NPP, the issue of preserving the possibility of using centralized heating facilities is acute. It is necessary to increase the thermodynamic efficiency of the cycles of steam turbine plants, both heating and condensing, which form the basis of the generation of the Belarusian power system, in order to restore the energy characteristics of the power system, which have somewhat decreased with the commissioning of the NPP. In the limit, the share of natural gas in the incoming part of the energy balance should be reduced to values not exceeding 50 %, in accordance with the requirements of energy security. The article considers examples of utilization of low-temperature secondary energy flows occurring at thermal power plants: the heat of the cooling processes of the generator, lubrication systems, as well as the heat of condensation of turbine exhaust steam and deeper cooling of flue gases. On the basis of this review, it is expected to identify promising areas of relevant research in relation to the energy system of Belarus.

1. Energy Use per Person. Our World in Data. Available at: https://ourworldindata.org/grap her/per-capita-energy-use?tab=chart&country=~OWID_WRL (accessed 14 February 2022).

2. Ritchie H., Roser М. (2020) Belarus: Energy Country Profile. Our World in Data. Available at: https://ourworldindata.org/energy/country/belarus?country=~BLR (accessed 4 July 2022).

3. Ritchie H., Roser М. (2020) Electricity Mix. Our World in Data. Available at: https://ourworldindata.org/electricity-mix#fossil-fuels-what-share-of-electricity-comes-from-fossil-fuels (accessed 14 February 2022).

4. Annual Data. Available at: https://www.belstat.gov.by/ofitsialnaya-statistika/realny-sector-ekonomiki/energeticheskaya-statistika/anual-dannye (accessed 14 February 2022) (in Russian).

5. Production of Electrical Energy [Electronic Resource]. Mode of access: https://belenergo.by/content/deyatelnost-obedineniya/proizvodstvo-elektricheskoy-energii (accessed 14 February 2022) (in Russian).

6. Voronov E. O., Romanyuk V. N., Sednin V. A. (2016) On the Issue of Assessing the Thermodynamic Efficiency of the Belarusian Energy System. Energiya i Menedzhment [Energy and Management], (3), 2–7 (in Russian).

7. Kazakov V. G. (2013) Exergetic Methods for Evaluating the Efficiency of Heat Engineering Installations. Saint-Petersburg. 93 (in Russian).

8. Muslina D. B. (2016) Scientific and Methodological Support for the Modernization of Thermal Power Systems of Textile and Knitwear Enterprises of Light Industry. Minsk. 172 (in Russian).

9. Masleeva O. V., Voevodin A. G., Pachurin G. V. (2014) Thermal Pollution of the Environment by Small-Scale Energy Facilities. Mezhdunarodnyy Zhurnal Prikladnykh i Fundamentalnykh Issledovaniy [International Journal of Applied and Fundamental Research], (5–1), 26–30 (in Russian).

10. Zhang H. S., Zhao H. B., Li Z. L. (2016) Performance Analysis of the Coal-Fired Power Plant with Combined Heat and Power (CHP) Based on Absorption Heat Pumps. Journal of the Energy Institute, 89 (1), 70–80. https://doi.org/10.1016/j.joei.2015.01.009.

11. Hu T., Xie X., Jiang Y. (2017) Simulation Research on a Variable-Lift Absorption Cycle and its Application in Waste Heat Recovery of Combined Heat and Power System. Energy, 140, 912–921. https://doi.org/10.1016/j.energy.2017.09.002.

12. Sun F., Fu L., Sun J., Zhang S. (2014) A New Waste Heat District Heating System with Combined Heat and Power (CHP) Based on Ejector Heat Exchangers and Absorption Heat Pumps. Energy, 69, 516–524. https://doi.org/10.1016/j.energy.2014.03.044.

13. Sun F., Fu L., Zhang S., Sun J. (2012) New Waste Heat District Heating System with Combined Heat and Power Based on Absorption Heat Exchange Cycle in China. Applied Thermal Engineering, 37, 136–144. https://doi.org/10.1016/j.applthermaleng.2011.11.007.

14. Pashka B. (2013) Exergy Method in Combined System of Heat Supply Thermal Power Station with District's Heat Pump. International Forum on Strategic Technology, IFOST, 2, 485–487. https://doi.org/10.1109/ifost.2013.6616923.

15. Brückner S., Liu S., Miró L., Radspieler M., Cabeza L. F., Lävemann E. (2015) Industrial Waste Heat Recovery Technologies: An Economic Analysis of Heat Transformation Technologies, Applied Energy, 151, 157–167. https://doi.org/10.1016/j.apenergy.2015.01.147.

16. Alimgazin A. Sh., Alimgazina S. G., Zhumagulov M. G. (2020) Heat Pump in a New Modular Configuration to Recover Low-Grade Heat Emissions at Enterprises. E3S Web of Conferences, 178, 01003. https://doi.org/10.1051/e3sconf/202017801003.

17. Duvanov S. A. (2006) Investigation of the Operation of Heat Pumps in Modes Other Than Nominal While Maintaining Output Parameters. Astrakhan. 196 (in Russian).

18. Artsiomenka K. I. (2019) Structural-and-Parametric Optimization of Automatic Control System for Power Units of 300 MW in Wide Range of Load Variations. Enеrgеtika. Izvestiya Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii SNG = Energetika. Proceedings of CIS Higher Education Institutions and Power Engineering Associations, 62 (5) 469–481. https://doi.org/10.21122/1029-7448-2019-62-5-469-481 (in Russian).

19. Kulakov G. T., Artsiomenka K. I. (2017) System Analysis of Scientific-and-Technical Information in Automatic Control System of Power Units Wattage. Enеrgеtika. Izvestiya Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii SNG = Energetika. Proceedings of CIS Higher Education Institutions and Power Engineering Associations, 60 (5), 446–458. https://doi.org/10.21122/1029-7448-2017-60-5-446-458 (in Russian).

20. Efimov N. N., Papin V. V., Malyshev P. A., Bezuglov R. V. (2010) Analysis of the Use of Heat Pumps in Thermal and Nuclear Power Plants. Izvestiya Vuzov. Severo-Kavkazskii Region. Seriya: Tekhnicheskie Nauki = Bulletin of Higher Educational Institutions. North Caucasus Region. Technical Sciences, (4), 35–39 (in Russian).

21. Anikina I. D., Sergeev V. V., Amosov N. T., Luchko M. G. (2016) Heat Pumps in Schemes of Make-Up Water Deaeration in a Thermal Power Plant. Nauchno-Tekhnicheskie Vedomosti Sankt-Peterburgskogo Gosudarstvennogo Politekhnicheskogo Universiteta = St. Petersburg State Polytechnical University Journal, 243 (2), 24–33. https://doi.org/10.5862/jest.243.3 (in Russian).

22. Plevako A. P., Chernetchenko G. B. (2008) The Possibility of Using Heat Pumps at Thermal Power Plants and Boiler Houses. Nauka i Tekhnika Kazakhstana = Science and Technology of Kazakhstan, (1), 61–64 (in Russian).

23. Oleynikova E. N. (2015) Research and Optimization of Heat Pump Installations in the Structure of CCGT-CHP Schemes. Moscow. 158 (in Russian).

24. Valiev R. N., Ziganshin S. G., Vankov U. V., Garipov R. R. (2017) Improving the Efficiency of the Combined Cycle Plant with Heatrecovery Boiler due to the Inclusion in the Scheme of Absorption. Izvestiya Vysshikh Uchebnykh Zavedenii. Problemy Energetiki = Power Engineering: Research, Equipment, Technology, 19 (11–12), 101–111 (in Russian).

25. Shidlovskaya D. K., Sedel'nikov G. D. (2016) Application of Absorption Heat Pumps in the Thermal Scheme of the T-180/210-130 Turbine Unit. Mezhdunarodnyi Studencheskii Nauchnyi Vestnik [International Student Research Bulletin], (3, Part 2), 270–271 (in Russian).

26. Yanchenko I. V. (2015) The Influence of an Absorption Heat Pump on the Thermal Efficiency of Thermal Power Plants and Nuclear Power Plants. Novocherkassk. 180 (in Russian).

27. Kurnakova N. Yu., Nuzhdin A. V., Volokhonsky A. А. (2018) On the Possibility to Improve the Energy Efficiency of the CHP Heat Balance Diagram Using a Heat Pump. Vestnik Irkutskogo Gosudarstvennogo Tekhnicheskogo Universiteta = Proceedings of Irkutsk State Technical University, 22 (7), 114–122. https://doi.org/10.21285/1814-3520-2018-7-114-122 (in Russian).

28. Shatalov I.K., Antipov Yu. A. (2004) Heating of Additional Cyclic Water with the Help of Heat Pump Installations. Vestnik Rossiiskogo Universiteta Druzhby Narodov. Seriya: Inzhenernye Issledovaniya = RUDN Journal of Engineering Research, (1), 60–65 (in Russian).

29. Chepyrniy M. N., Rezident N. V. (2013) Application of Steam Compression Thermal Pumping Plants for Utilization of the Discharged Heat of Steam Turbines Condensers. Scientific Works of Vinnytsia National Technical University, (4), 1–7.

30. Romaniuk V. N., Bobich A. A. (2015) Absorption Heat Pumps at the CHPP of the Belarusian Unified Energy System on the Example of the Mozyr CHPP. Energiya i Menedzhment [Energy and Management], (1), 4–11 (in Russian).

31. Sednin V. A., Raiko D. M., Levin V. M. (2015) On the Issue of Improving the Efficiency of Heating Boilers and Mini-CHP. Energiya i Menedzhment [Energy and Management], (1), 12–17 (in Russian).

32. Romaniuk V. N., Bobich A. A. (2020) Development of Energy Saving in Boiler Houses Due to Utilization of Low-Temperature Heat Flows of Cooling of Outgoing Flue Gases. Energoeffektivnost’ [Energy Efficiency], (8), 7–14 (in Russian).

33. Romaniuk V. N., Bobich A. A. (2016) Numerical Study of Thermal Schemes of Thermal Power Plants Fulfilled with the Аid of Their Topological Models. Enеrgеtika. Izvestiya Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii SNG = Energetika. Proceedings of CIS Higher Education Institutions and Power Engineering Associations, 59 (4), 376–390. https://doi.org/10.21122/1029-7448-2016-59-4-376-390 (in Russian).

34. Romanyuk V. N., Muslina D. B., Bobich A. A., Kolomytskaya N. A., Bubyr’ T. V., Mal’kov S. V. (2013) Absorption Heat Pumps in the Thermal Scheme of a Thermal Power Plant to Increase its Energy Efficiency. Energiya i Menedzhment [Energy and Management], (1), 14–19 (in Russian).

35. Romaniuk V. N., Bobich A. A., Mal’kov S. V. (2013) Absorption or Vapor Compression Heat Pumps in CHP Circuits. Energiya i Menedzhment [Energy and Management], (4), 18–21 (in Russian).

36. Romaniuk V. N., Bobich A. A. (2016) Substantiation of the Absorption Bromide Lithium Heat Pump Parameters for the Utilization of PWR at a Thermal Power Plant Using a Passive Experiment and Determination of the Corresponding Changes in Various Estimates of the Operation of the Power System. Energiya i Menedzhment [Energy and Management], (1), 14–23 (in Russian).

37. Romaniuk V. N., Bobich A. A. (2017) The Time of Application of Absorption Bromide Lithium Heat Pumps at the CHP of Belarus. Energiya i Menedzhment [Energy and Management], (2), 2–5 (in Russian).

38. Bоbich A. A. (2018) The Complex of Energy-Saving Measures at the CHP Plant when Adapting to the Operating Conditions of the Power System with the Commissioning of the Belarusian NPP. Minsk. 224 (in Russian).