№1|2020

ENERGY CONSERVATION

DOI 10.35776/MNP.2020.01.06
UDC 621.65:62-531.3

Usachev A. P.

Method of evaluating the effectiveness of frequency regulation of the performance of sewage pumping units

Summary

The method of evaluating energy savings through the use of frequency regulation of the pumping unit performance at sewage pumping stations is considered. The method is based on a graphical analysis of the parameters of the operation point of the pumps in the working group and is developed for the use in sewer networks that operate according to the level in the receiving tank. The proposed method of evaluating the effectiveness of frequency regulation at sewage pumping stations has been proved by many years of experience of using and is precisely evaluative. Energy savings at sewage pumping stations are significantly lower than at water pumping stations. This applies to the systems with start/stop control because the effect of frequency regulation consists in reducing the velocity of fluid in the pressure pipeline. The bigger the dynamic component of the network characteristic in relation to its static component (in the range of the station capacity change), the stronger effect is manifested. In practice, this is extremely rare. The energy savings in the above examples with the start/stop mode does not exceed 10% (excluding the losses in the frequency converter).

Key words

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REFERENCES

  1. Usachev A. P. [Method of estimating the efficiency of pumping unit frequency regulation]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2018, no. 7, pp. 57–63. (In Russian).
  2. Leznov B. S., Vorob’ev S. V. [The operation of centrifugal pumps with variable speed]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2012, no. 11, pp. 44–49. (In Russian).
  3. Usachev A. P., Gordeichik A. V. [Specific features of frequency regulation of pumps taking into account the operating range]. Proceedings of «Water supply and wastewater disposal of settlements» International Conference. International Forum «Water: Ecology and Technology» «ECWATECH–2014». Moscow, 2014.
  4. Usachev A. P. [On the use of similarity equations in technical and economic calculations in the frequency regulation of pumping units]. Proceedings of «Solving environmental safety issues in the water sector» VI International Scientific-Production Conference. Novosibirsk, 2010.
  5. Usachev A. P. [Control of centrifugal pump parallel operation]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2018, no. 2, pp. 55–60. (In Russian).

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