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Waste Heat Recovery in a Sulfuric Acid Production Unit

  • Fathia Chouaibi
  • Jalel Belghaieb
  • Nejib Hajji
Chapter
Part of the Green Energy and Technology book series (GREEN)

Abstract

This paper is a contribution to the waste heat recovery in a diammonium phosphate production plant. Such plant is made of sulfuric acid, phosphoric acid, and diammonium phosphate production units.

The production of sulfuric acid by the contact process results in a significant waste of thermal energy associated with acid cooling by seawater. Such waste can exceed 30 MW for a production of 1500 tons/day. Furthermore, this process rejects about 150 t/h of gas at a temperature of 70 °C.

In this paper three systems are presented for waste heat recovery in the studied plant. First, a hot water loop is designed for the production of low-pressure steam. The thermal energy to be used in this loop comes from the sulfuric acid streams that need to be cooled in the process. Then, low-pressure steam is substituted by sulfuric acid for the concentration of the phosphoric acid produced in the same plant. Finally, a pre-concentration of the phosphoric acid is considered by direct contact with the rejected hot gases in a spray column.

A techno-economic study was conducted to evaluate the profitability of the proposed systems.

Keywords

Waste heat recovery Steam production Sulfuric acid Phosphoric acid 

References

  1. Abdel-Aal, H.K., Aggour, M., Fahim, M.A.: Petroleum and gas field processing, Marcel Dekker, Inc, New York, USA (2003)Google Scholar
  2. Almirall, B.X.: Introduction to wet sulfuric acid plants optimization through exergoeconomics. Master’s thesis, Technical university of Berlin (2009)Google Scholar
  3. AL-Rabghi, O.M., Bemuttv, M., Akvurt, M., Najjar, Y., Alp, T.: Recovery and utilization of waste heat. Heat Recover. Syst. CHP. 13(5), 463–470 (1993)CrossRefGoogle Scholar
  4. Chouaibi, F., Belghaieb, J., Hajji, N.: Assessment of energy performances of a sulfuric acid production unit using exergy analysis. Int. J. Cur. Eng. Technol. 3(1), 149–157 (2013)Google Scholar
  5. Johnson, Choate, B., Dillich, S.: Waste heat recovery: opportunities and challenges. TMS Annual Meeting, 47–52 (2008)Google Scholar
  6. Karellas, S., Leontaritis, A.-D., Panousis, G., Bellos, E., Kakaras, E.: Energetic and exergetic analysis of waste heat recovery systems in the cement industry. Energy. 58, 147–156 (2013)CrossRefGoogle Scholar
  7. Skop, H., Chudnovsky, Y.: Strategy for integrated use of the industrial waste heat. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. In: Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006-Heat Transfer (2006)Google Scholar
  8. Stewart, M., Arnold, K.: Gas-liquid and liquid-liquid separators. Elsevier Inc, USA (2008)Google Scholar
  9. Uniongas,: Conversion factors based on Energy Content, (2014) https://www.uniongas.com/
  10. Zhang, L., Akiyama, T.: How to recuperate industrial waste heat beyond time and space. Int. J. Energy. 6(2), 214–227 (2009)Google Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Energy and Environment Unit, National Engineering School of Gabes (ENIG)Gabes UniversityGabesTunisia

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