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Technical Aspects and Energy Effects of Waste Heat Recovery from District Heating Boiler Slag

Author

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  • Mariusz Tańczuk

    (Faculty of Mechanical Engineering, Opole University of Technology, ul. Mikołajczyka 5, 45-271 Opole, Poland)

  • Maciej Masiukiewicz

    (Faculty of Mechanical Engineering, Opole University of Technology, ul. Mikołajczyka 5, 45-271 Opole, Poland)

  • Stanisław Anweiler

    (Faculty of Mechanical Engineering, Opole University of Technology, ul. Mikołajczyka 5, 45-271 Opole, Poland)

  • Robert Junga

    (Faculty of Mechanical Engineering, Opole University of Technology, ul. Mikołajczyka 5, 45-271 Opole, Poland)

Abstract

Coal continues to dominate in the structure of the heat production system in some European countries. Coal-fired boilers in district heating and power generation systems are accompanied by the formation of large quantities of slag and ash. Due to considerable high temperature, slag may be used as a source of waste energy. In this study, the technical possibilities of recovery slag’s physical enthalpy from grate-fired district heating boiler of 45 MW thermal capacity are analyzed. The aim of the work is to estimate the waste energy potential of the slag in analyzed boiler and proposition of the heat recovery system. The construction and design of the existing deslagging system was examined. Studies have shown that high water temperature accelerates system wear. Recovering heat from this system decreases the water temperature, which extends the trouble-free working time. The slag parameters were determined, including the temperature at the outlet of the boiler and the temperature after leaving the slag water tub. The annual amount of heat regenerative potential was estimated. On the basis of the research, the authors propose a waste heat recovery facility with high temperature R134a heat pump system. The result of the conducted research is that the proposed heat pump provides energy savings that are worth considering by recovering from 58.8% to 88.0% of energy slag potential.

Suggested Citation

  • Mariusz Tańczuk & Maciej Masiukiewicz & Stanisław Anweiler & Robert Junga, 2018. "Technical Aspects and Energy Effects of Waste Heat Recovery from District Heating Boiler Slag," Energies, MDPI, vol. 11(4), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:4:p:796-:d:138817
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    References listed on IDEAS

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    Cited by:

    1. Darko Goričanec & Igor Ivanovski & Jurij Krope & Danijela Urbancl, 2020. "The Exploitation of Low-Temperature Hot Water Boiler Sources with High-Temperature Heat Pump Integration," Energies, MDPI, vol. 13(23), pages 1-12, November.
    2. Junga, Robert & Pospolita, Janusz & Niemiec, Patrycja, 2020. "Combustion and grindability characteristics of palm kernel shells torrefied in a pilot-scale installation," Renewable Energy, Elsevier, vol. 147(P1), pages 1239-1250.
    3. Mariusz Tańczuk & Robert Junga & Alicja Kolasa-Więcek & Patrycja Niemiec, 2019. "Assessment of the Energy Potential of Chicken Manure in Poland," Energies, MDPI, vol. 12(7), pages 1-18, April.
    4. Xuan Yao & Man Zhang & Boyu Deng & Xinhua Yang & Hairui Yang, 2021. "Primary Research of a New Zero-Liquid-Discharge Technology of Wet Flue Gas Desulfurization Wastewater by Low-Rank Heat from Flue Gas," Energies, MDPI, vol. 14(14), pages 1-9, July.
    5. Soheil Kavian & Mohsen Saffari Pour & Ali Hakkaki-Fard, 2019. "Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection," Energies, MDPI, vol. 12(9), pages 1-30, May.
    6. Zbigniew Plutecki & Paweł Sattler & Krystian Ryszczyk & Anna Duczkowska & Stanisław Anweiler, 2020. "Thermokinetics of Brown Coal during a Fluidized Drying Process," Energies, MDPI, vol. 13(3), pages 1-16, February.
    7. Francesco Calise & Mário Costa & Qiuwang Wang & Xiliang Zhang & Neven Duić, 2018. "Recent Advances in the Analysis of Sustainable Energy Systems," Energies, MDPI, vol. 11(10), pages 1-30, September.

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