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Thermal performance evaluation of subcritical organic Rankine cycle for waste heat recovery from sinter annular cooler

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Abstract

The sinter cooling flue gas expelled from the end of an annular cooler was taken as the heat source of an organic Rankine cycle (ORC) system, and R123, R245fa, R600, R601 and R601a were selected as the working fluids of the ORC system. The effects of evaporation temperature and superheat degree of working fluid, as well as the pinch point temperature difference in the evaporator on the system thermal performance, were analyzed in detail. The results show that the system net output power and exergy efficiency for different working fluids first increase and then decrease with an increase in the evaporation temperature and decrease with an increase in the superheat degree and pinch point temperature difference. The change in pinch point temperature difference has no effect on the system thermal efficiency. For a given operational condition, the system thermal efficiency and exergy efficiency of R123 are the maximum, while the system total irreversible loss of R245fa is the maximum. When the evaporation temperature is greater than 110 °C, the system net output power of R600 is the maximum. The ORC system could obtain the maximum net output power and exergy efficiency through the adjustment of evaporation temperature of working fluid.

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Acknowledgements

We would like to acknowledge financial support for this work provided by the National Natural Science Foundation of China (5171101721, 51974087), China Postdoctoral Science Foundation (2018M642538), Fundamental Research Funds for the Central Universities (WK2090130025) and Anhui Provincial Natural Science Foundation (1908085QE203).

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Authors and Affiliations

  1. School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei, 230026, Anhui, China

    Jun-sheng Feng

  2. School of Engineering and Science, University of Science and Technology of China, Hefei, 230026, Anhui, China

    Guang-tao Gao, Yousef N. Dabwan & Gang Pei

  3. School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, China

    Hui Dong

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  1. Jun-sheng Feng
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  2. Guang-tao Gao
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Correspondence to Gang Pei.

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Feng, Js., Gao, Gt., Dabwan, Y.N. et al. Thermal performance evaluation of subcritical organic Rankine cycle for waste heat recovery from sinter annular cooler. J. Iron Steel Res. Int. 27, 248–258 (2020). https://doi.org/10.1007/s42243-019-00355-2

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  • DOI: https://doi.org/10.1007/s42243-019-00355-2

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