Keywords
How to Cite
Abstract
Abstract. Introduction. This study is devoted to the analysis of modern methods of utilizing flue gas heat in thermal power plants (TPPs). Strengthening scientific research aimed at increasing the useful efficiency of steam turbine thermal power plants currently in use is one of the urgent issues facing the world energy sector. The purpose of the study is to identify methods for reducing heat losses with flue gases of steam turbine units and to develop and evaluate the efficiency of thermal schemes.
Usul va materiallar. During the research, the Organic Rankine Cycle (ORC), absorption heat pump systems (AHP/OAHP), low-pressure economizers (LPE), heat pipe heat exchangers (HPHE) and thermoelectric generators (TEG) were analyzed as the main technologies.
Results: Based on the research, OAHP systems allow recovering up to 80-95% of the available and latent heat in flue gases, while the ORC system can generate power from 220 W to 15 MW with a thermal efficiency of 8-12%. The highest economic performance was recorded for absorption heat pump systems with a payback period of 1.4-2.5 years.
Conclusion. According to the results of the study, the developed recommendations for the utilization of thermal power plant heat waste serve as the basis for further scientific research.
References
[1]. Zhang H., Dong Y., Lai Y., Zhang H., Zhang X. Waste heat recovery from coal-fired boiler flue gas: Performance optimization of a new open absorption heat pump. //Applied Thermal Engineering. - 2021. - Vol. 183. - P. 116111.
[2]. Li Z., Xue S., Hu D., Teng D., Zhang S., Shen G. Performance Analysis of an Absorption Heat Pump System for Waste Heat and Moisture Cascade Recovery from Flue Gas. // ACS Omega. - 2022. - Vol. 7. - P. 24596-24605. https://doi.org/10.1021/acsomega.2c02407
[3]. Kim Y.-M., Negash A., Shamsi S.S.M., Shin D.-G., Cho G. Experimental Study of a Lab-Scale Organic Rankine Cycle System for Heat and Water Recovery from Flue Gas in Thermal Power Plants. //Energies (MDPI). - 2021. - Vol. 14, No. 14. - P. 4328. https://doi.org/10.3390/en14144328
[4]. Wang X., Zhuo J., Liu J., Li S. Thermo-economic analyses of the waste heat and water recovery system from flue gas by heat pump integrated with different heat utilization ways in coal-fired power plant. //Energy. - 2020. - Vol. 197. - P. 117253. https://doi.org/10.1016/j.energy.2020.117253
[5]. Teng D., Chen O., Lu G., Bi D., Zhang Q., Li L. Research on Thermodynamic Characteristics of the Saturated Flue Gas Waste Heat Recovery to Reduce Turbine Extraction Steam. //ACS Omega. - 2023. - Vol. 8, No. 49. - P. 47183-47196. https://doi.org/10.1021/acsomega.3c07437
[6]. Nyakuma B.B. Recovery and utilisation of waste heat from flue/exhaust gases: a bibliometric analysis (2010-2022). // Energy Reports. - 2023. - Vol. 9. - P. 5058-5070. https://doi.org/10.1016/j.egyr.2023.04.032
[7]. Yang H., Li D., Li K., Wu W., Ren J. Design on a novel waste heat recovery system integrated with the bypass flue and outside primary air preheater for bitumite-fired power plants. // Energy. - 2024. - Vol. 289. - P. 129955. https://doi.org/10.1016/j.energy.2024.001129
[8]. Song J., Zhang H., Zhang Y., Ma Z., He M. Research progress on industrial waste heat recycling and seasonal energy storage. // AIMS Energy. - 2025. - Vol. 13, No. 1. - P. 147-187. https://doi.org/10.3934/energy.2025006
[9]. Men Y., Liu X., Zhang T. A review of boiler waste heat recovery technologies in the medium-low temperature range. // Energy. - 2021. - Vol. 237. - P. 121560. https://doi.org/10.1016/j.energy.2021.121560
[10]. Tan Z., Feng X., Wang Y. Performance comparison of different heat pumps in low-temperature waste heat recovery. // Renewable and Sustainable Energy Reviews. - 2021. - Vol. 152. - P. 111634. https://doi.org/10.1016/j.rser.2021.111634
[11]. Kang S., Kim K., Seo J.H., Lee J. Effective Waste Heat Recovery of Boiler Flue Gas Using a Heat Pipe Heat Exchanger: A Performance Comparison With Finned-Tube Economizer. // International Journal of Energy Research. - 2025. - Vol. 2025. - Article 8781810. https://doi.org/10.1155/er/8781810
[12]. Chen O., Lu G., Bi D., Li L. Performance Analysis of a Compound Absorption Heat Pump System for Waste Heat and Moisture Recovery from Flue Gas. // ACS Omega. - 2025. https://doi.org/10.1021/acsomega.4c06350
[13]. Liang D., Huang J., Zhang Y., Zhang Z., Chen H., Zhang H. Influence of dextrin content and sintering temperature on the properties of coal fly ash-based tubular ceramic membrane for flue gas moisture recovery. // Journal of the European Ceramic Society. - 2021. - Vol. 41. - P. 5696-5710. https://doi.org/10.1016/j.jeurceramsoc.2021.04.055
[14].Yang B., Yuan W., Hou J., Zheng T. Flash-heat pump-heat exchanger (FHH) and heat exchanger-heat pump (HH) systems for flue gas heat recovery in coal-fired power plants. // Energy. - 2024. - Vol. 289. - P. 130011. https://doi.org/10.1016/j.energy.2024.130011
[15]. Kubenova M., Kuterbekov K., Bekmyrza K., Kabyshev A., Kabdrakhimova G., Atamurotov F., Ibrahim W. Exhaust waste heat recovery system using thermoelectric generator: a prospective of novel simulation technique toward low-carbon technology. //International Journal of Low-Carbon Technologies. - 2025. - Vol. 20. - ctae249. https://doi.org/10.1093/ijlct/ctae249
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright (c) 2026 Xujakulov, S.M., Rustamov, T.A., Mirzayev, S.S. (Muallif)