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Analysis of the use of waste heat obtained from coal-fired units in Organic Rankine Cycles and for brown coal drying

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  • Łukowicz, Henryk
  • Kochaniewicz, Andrzej

Abstract

The ever-increasing restrictions on greenhouse gas emissions have created a need for new energy technologies. One way to meet these new requirements is to optimise the efficiency of power units. This paper presents two energy technologies that, if used, will increase the efficiency of electricity generation. One of the most effective ways to improve the efficiency of brown coal-fired units is by drying the coal that is fed into the boiler. Here, we describe a technology that uses the waste heat obtained from exhaust gases. This paper also presents an analysis of the feasibility of and potential for using waste heat obtained from exhaust gases to feed Organic Rankine Cycles (ORCs). Several low-temperature working fluids were considered, which were selected based on properties that were best suited for these types of cycles. The impact of these working fluids on the efficiency and capacity of the ORC was also examined. The calculations for ORCs fed with waste heat obtained from exhaust gases from hard coal- and brown coal-fired boilers were compared.

Suggested Citation

  • Łukowicz, Henryk & Kochaniewicz, Andrzej, 2012. "Analysis of the use of waste heat obtained from coal-fired units in Organic Rankine Cycles and for brown coal drying," Energy, Elsevier, vol. 45(1), pages 203-212.
    • Handle: RePEc:eee:energy:v:45:y:2012:i:1:p:203-212
    DOI: 10.1016/j.energy.2012.03.035
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    4. Liu, Ming & Yan, JunJie & Chong, DaoTong & Liu, JiPing & Wang, JinShi, 2013. "Thermodynamic analysis of pre-drying methods for pre-dried lignite-fired power plant," Energy, Elsevier, vol. 49(C), pages 107-118.
    5. Mingwei Yan & Yuetao Shi, 2020. "Thermal and Economic Analysis of Multi-Effect Concentration System by Utilizing Waste Heat of Flue Gas for Magnesium Desulfurization Wastewater," Energies, MDPI, vol. 13(20), pages 1-20, October.
    6. Chen, Xiaohui & Zheng, Danxing & Guo, Jing & Liu, Jingxiao & Ji, Peijun, 2013. "Energy analysis for low-rank coal based process system to co-produce semicoke, syngas and light oil," Energy, Elsevier, vol. 52(C), pages 279-288.
    7. Kai Yang & Hongguang Zhang & Songsong Song & Fubin Yang & Hao Liu & Guangyao Zhao & Jian Zhang & Baofeng Yao, 2014. "Effects of Degree of Superheat on the Running Performance of an Organic Rankine Cycle (ORC) Waste Heat Recovery System for Diesel Engines under Various Operating Conditions," Energies, MDPI, vol. 7(4), pages 1-23, April.
    8. Carcasci, Carlo & Ferraro, Riccardo & Miliotti, Edoardo, 2014. "Thermodynamic analysis of an organic Rankine cycle for waste heat recovery from gas turbines," Energy, Elsevier, vol. 65(C), pages 91-100.
    9. Carlo Carcasci & Lapo Cheli & Pietro Lubello & Lorenzo Winchler, 2020. "Off-Design Performances of an Organic Rankine Cycle for Waste Heat Recovery from Gas Turbines," Energies, MDPI, vol. 13(5), pages 1-15, March.
    10. Jin, Yunli & Gao, Naiping & Wang, Tiantian, 2020. "Influence of heat exchanger pinch point on the control strategy of Organic Rankine cycle (ORC)," Energy, Elsevier, vol. 207(C).
    11. Wei, Maolin & Zhao, Xiling & Fu, Lin & Zhang, Shigang, 2017. "Performance study and application of new coal-fired boiler flue gas heat recovery system," Applied Energy, Elsevier, vol. 188(C), pages 121-129.
    12. Han, Xiaoqu & Liu, Ming & Zhai, Mengxu & Chong, Daotong & Yan, Junjie & Xiao, Feng, 2015. "Investigation on the off-design performances of flue gas pre-dried lignite-fired power system integrated with waste heat recovery at variable external working conditions," Energy, Elsevier, vol. 90(P2), pages 1743-1758.

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