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A comparative study on the reducing flow rate design method for a desalination energy recovery pump as turbine

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Abstract

The energy recovery and utilization of high-pressure brine are the key to reduce the cost. Reducing flow rate method (RFM) was put forward firstly to adapt pump as turbine (PAT) to a wide range of operating conditions in this paper. In order to validate advantages of the new method, three different designs of PAT were obtained, respectively, based on three different methods, which were, respectively, selection design method, forward curved method and RFM. Based on numerical method, the external energy characteristics, axial force and internal flow patterns of PATs were analyzed. Results show that matching of the blade inlet angle and flow angle at the blade leading edge has a great influence on the turbine flow patterns which are directly related to the efficiency of PAT. A PAT designed by the new design method RFM improves both the hydraulic efficiency and shaft power under design and partial load conditions. Moreover, the axial force of the PAT designed by RFM is reduced, which can improve the reliability of the PAT operation with high rotating speed.

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Abbreviations

BEP:

Best efficiency point

CFD:

Computational fluid dynamics

PAT:

Pump as Turbine

RO:

Reverse osmosis membrane

SDM:

Selection design method

FCM:

Forward curved method

RFM:

Reducing flow rate method

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Acknowledgements

This study is financially supported by the National key R&D project (2017YFC0404201) and Key R & D projects in Jiangsu Province (BE2017144). The supports are gratefully acknowledged.

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Authors and Affiliations

  1. National Research Center of Pumps, Jiangsu University, Zhenjiang, 212013, Jiangsu, China

    Bing Qi, Desheng Zhang, Yan Li, Xi Shen & Linlin Geng

  2. Eindhoven University of Technology, 5600MB, Eindhoven, The Netherlands

    Bart P. M. van Esch

Authors
  1. Bing Qi
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  2. Desheng Zhang
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  3. Yan Li
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  4. Xi Shen
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  5. Linlin Geng
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  6. Bart P. M. van Esch
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Correspondence to Desheng Zhang.

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Technical Editor: Monica Carvalho.

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Qi, B., Zhang, D., Li, Y. et al. A comparative study on the reducing flow rate design method for a desalination energy recovery pump as turbine. J Braz. Soc. Mech. Sci. Eng. 43, 441 (2021). https://doi.org/10.1007/s40430-021-03143-w

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  • DOI: https://doi.org/10.1007/s40430-021-03143-w

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