Skip to main content
SpringerLink
Log in

A Mathematical Model and Design Calculation of a Thermal Deaerator with a Bubbling Storage Tank

  • WATER TREATMENT AND WATER CHEMISTRY
  • Published:
Thermal Engineering Aims and scope Submit manuscript

Abstract

A mathematical model of mass transfer in an atmospheric bubbling deaerator storage tank at thermal power stations (TPS) to calculate the removal efficiency of dissolved gases from water is considered. For mathematical simulation and calculation of the deaerator efficiency, a system of differential equations of mass and heat transfer is written in a local form for the liquid phase of the layer with volume interphase sources of mass and heat. Mass transfer of the dissolved gases from water to the vapor phase is taken into account using volume interphase sources and the balance equations. Parameters of the interphase sources and correlations for calculating the eddy viscosity of the liquid phase depending on bubbling conditions are given. Results from the system of equations' numerical solution are presented and compared with the available experimental data on the final concentration of dissolved oxygen at the deaerator outlet. Curves of the efficiency of dissolved oxygen removal depending on the operating conditions and design characteristics of the bubbling process are presented, and scientific-and-engineering solutions have been developed to upgrade the bubbling storage tank. It has been found that an increase in gas velocity sharply raises the deaeration efficiency to a certain value (depending on the specified initial parameters), and the efficiency growth is then retarded. Similarly, increasing the length of a bubbling device improves the efficiency in removal of dissolved oxygen from water. One of the causes of a decrease in the water deaeration efficiency is likely to be back mixing of the flow. Upgrading of the deaerator tank is in the installation of perforated baffles across the flow to considerably reduce back mixing of the liquid phase. This increases the driving force of mass transfer, and its efficiency improves by five to 20% depending on the steam velocity. The presented mathematical model can be generalized to a wide range of bubbling apparatuses with a high two-phase layer.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.

Similar content being viewed by others

REFERENCES

  1. E. U. Yamleeva and V. I. Sharapov, “Investigation of the aeration process of deaerated water in storage tanks of thermal power plants of Ul’yanovsk,” Vestn. Ul’yanovsk. Gos. Tekh. Univ., No. 1, 42–47 (2018).

  2. V. I. Sharapov, E. V. Kudryavtseva, and O. V. Pazushkina, “Mass exchange and hydrodynamics of deaerators of thermal power plants during their use as a desorption medium of natural gas,” Izv. Vyssh. Uchebn. Zaved., Probl. Energ. 19 (1–2), 86–94 (2017).

    Google Scholar 

  3. V. I. Sharapov and E. V. Kudryavtseva, “Technical and economic assessment of the application of low-temperature water deaeration technologies,” Prom. Energ., No. 6, 23–26 (2017).

  4. G. V. Ledukhovskii, Yu. E. Barochkin, V. P. Zhukov, V. N. Vinogradov, and I. A. Shatova, “Water deaeration in water-cooling systems of the stator winding in a turbogenerator with hydrogen-water cooling,” Therm. Eng. 65, 751–755 (2018). https://doi.org/10.1134/S004060151810004X

  5. G. V. Ledukhovskii, “Modeling the water decarbonization processes in atmospheric deaerators,” Therm. Eng. 64, 127–133 (2017). https://doi.org/10.1134/S0040601517020057

    Article  Google Scholar 

  6. G. V. Ledukhovskii, “Experimental studies and modeling of the carbonic acid removal processes from the water in atmospheric-pressure deaerators,” Vestn. Ivanov. Gos. Energ. Univ., No. 3, 5–13 (2016).

  7. A. A. Korotkov, Improving the Efficiency of Water Decarbonization by Thermal Atmospheric-Pressure Deaerators , Candidate’s Dissertation in Engineering (Ivanovo State Power Engineering Univ, Ivanovo, 2013).

  8. R. I. Nigmatulin, Dynamics of Multiphase Media (Nauka, Moscow, 1987; Hemisphere, New York, 1991).

  9. V. N. Sokolov and I. V. Domanskii, Gas-Liquid Reactors (Mashinostroenie, Leningrad, 1976) [in Russian].

    Google Scholar 

  10. A. G. Laptev and M. I. Farakhov, Hydromechanical Processes in Petroleum Chemistry and Power Engineering (Kazan. Gos. Univ, Kazan, 2008) [in Russian].

    Google Scholar 

  11. A. G. Laptev, Models of the Boundary Layer and Calculation of Heat-and-Mass Transfer Processes (Kazan. Gos. Univ, Kazan, 2007) [in Russian].

    Google Scholar 

  12. A. G. Laptev, M. M. Basharov, E. A. Lapteva, and T. M. Farakhov, Models and Efficiency of the Processes of Multiphase Transfer, Ed. by A. G. Lapteva (Tsentr Innovatsionnykh Tekhnol., Kazan’, 2017) [in Russian].

  13. A. G. Laptev, R. Sh. Misbakhov, and E. A. Lapteva, “Numerical simulation of mass transfer in the liquid phase of the bubble layer of a thermal deaerator,” Therm. Eng. 62, 911–915 (2015). https://doi.org/10.1134/S0040601515120058

    Article  Google Scholar 

Download references

Funding

The investigation was performed under a grant of the Russian Science Foundation (project no. 18-79-10136).

Author information

Authors and Affiliations

  1. Kazan State Power Engineering University, 420066, Kazan, Russia

    A. G. Laptev & E. A. Lapteva

Authors
  1. A. G. Laptev
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. E. A. Lapteva
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to A. G. Laptev.

Additional information

Translated by T. Krasnoshchekova

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Laptev, A.G., Lapteva, E.A. A Mathematical Model and Design Calculation of a Thermal Deaerator with a Bubbling Storage Tank. Therm. Eng. 66, 681–686 (2019). https://doi.org/10.1134/S0040601519090027

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0040601519090027

Keywords:

Search

Navigation