Calculations of two-flow regeneration of activated methyldiethanolamine solution

Authors

DOI:

https://doi.org/10.15587/2706-5448.2020.220064

Keywords:

process gas, carbon monoxide (IV), methyldiethanolamine, piperazine, two-section plate regenerator, numerical integration.

Abstract

The object of research is the stage of regeneration of the spent solution of purification of process gas from CO2 in the production of ammonia with a capacity of 1360–1500 t/day, in a two-section plate regenerator-recuperator. The calculations confirmed the possibility of replacing the monoethanolamine absorbent solution (MEA) with activated methyldiethanolamine solution (aMDEA) for a two-flow purification and regeneration scheme. One of the most problematic places is the lack of a mathematical model of two-flow regeneration of a new absorbent. During the study to determine the composition of the vapor-gas mixture used the method of material balance, which takes into account the temperature of the upper and lower parts of the regenerator and proposed numerical integration to calculate the number of plates of the regenerator.

An algorithm and a program of multivariate calculations have been developed and implemented in Excel, which provide for variation of concentration parameters over a vapor-gas mixture. Thermal calculations take into account the endothermic reactions of CO2 desorption, water evaporation and determine the specific heat consumption for solution regeneration. The decrease of specific heat consumption for regeneration of activated aMDEA solution from 4.4 to 3.11 MJ/m3CO2 was determined in comparison with MEA solution. The approximations of the equilibrium pressure of CO2 over the MDEA solution on the degree of carbonization of solution and the desorption temperature are approximated. The kinetic calculation of the regenerator established the number of plates equal to 14 when the number of 31 plates in a standard regenerator-recuperator. The calculated number of plates determines the reliable regeneration of the solution in one apparatus to the required degree of carbonization of coarsely (0.35) and finely regenerated (0.1) solutions. The reduction in the number of plates when using aMDEA is due to taking into account the properties of this solution, in particular, the difference in the equilibrium pressure of CO2 over aMDEA compared to MEA. The real possibility of using 40 % aMDEA solution instead of 18 % MEA solution on existing two-stream absorbers and regenerators without changing the technological scheme is established.

Author Biographies

Andriy Kontsevoy, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», 37, Peremohy ave., Kyiv, Ukraine, 03056

PhD, Associate Professor

Department of Inorganic Technology, Water Purification and General Chemical Technology

Sergii Kontsevoi, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», 37, Peremohy ave., Kyiv, Ukraine, 03056

PhD, Associate Professor

Department of Inorganic Technology, Water Purification and General Chemical Technology

References

  1. Semenova, T. A.; Semenova, T. A. (Ed.) (1977). Ochistka tekhnologicheskikh gazov. Moscow: Khimiia, 488.
  2. Weiland, R. H., Hatcher, N. A., Nava, J. L. (2010). Post-combustion CO2 Capture with Amino-Acid Salts: Optimized Gas Treating. Available at: https://www.protreat.com/files/publications/43/Manuscript_CO2_Capture_with_Amino_Acids.pdf
  3. Yankovskyi, M. A., Demydenko, I. M., Melnykov, B. I., Loboiko, O. Ya., Korona, H. M. (2004). Tekhnolohiia amiaku. Dnipropetrovsk, UDKhTU, 300.
  4. Semenov, V. P.; Semenov, V. P. (Ed.) (1985). Proizvodstvo ammiaka. Moscow: Khimiia, 368.
  5. Rufford, T. E., Smart, S., Watson, G. C. Y., Graham, B. F., Boxall, J., Diniz da Costa, J. C., May, E. F. (2012). The removal of CO2 and N2 from natural gas: A review of conventional and emerging process technologies. Journal of Petroleum Science and Engineering, 94-95, 123–154. doi: http://doi.org/10.1016/j.petrol.2012.06.016
  6. Weiland, R. H., Hatcher, N. A., Nava, J. L. (2007). Post-combustion CO2 Capture with Amino-Acid Salts: Optimized Gas Treating. Inc. Clarita. Available at: https://www.protreat.com/files/publications/43/Manuscript_CO2_Capture_with_Amino_Acids.pdf
  7. Vakk, E. G., Shuklin, G. V., Leites, I. L. (2011). Poluchenie tekhnologicheskogo gaza dlia proizvodstva ammiaka, metanola, vodoroda i vysshikh uglevodorodov. Teoreticheskie osnovy, tekhnologiia, katalizatory, oborudovanie, sistemy upravleniia. Moscow, 480.
  8. Combs, G., McGuire, L. (2010). MDEA Based CO2 Removal System Process Simulation. Louisiana. Available at: http://www.chemengservices.com/tech71.html
  9. Aminovaia ochistka. GazSerf. Available at: http://gazsurf.com/ru/gazopererabotka/oborudovanie/modelnyj-ryad/item/aminovaya-ochistka
  10. Li, X., Wang, S., Chen, C. (2013). Experimental Study of Energy Requirement of CO2 Desorption from Rich Solvent. Energy Procedia, 37, 1836–1843. doi: http://doi.org/10.1016/j.egypro.2013.06.063
  11. Khan, B. A., Ullah, A., Saleem, M. W., Khan, A. N., Faiq, M., Haris, M. (2020). Energy Minimization in Piperazine Promoted MDEA-Based CO2 Capture Process. Sustainability, 12 (20), 8524. doi: http://doi.org/10.3390/su12208524
  12. Kontsevoi, A. L., Lukianchuk, T. O., Kontsevoi, S. A. (2018). Modeliuvannia reheneratsii rozchynu metyldietanolaminu. Internauka, 16 (56), 32–36.
  13. Kontsevoy, A., Kontsevoi, S. (2019). Modeling of two-flow regeneration of monoethanolamine solution. Vìsnyk Cherkaskogo Derzhavnogo Tekhnologìchnogo Unìversytetu. Seriia: tekhnichni nauky, 4, 96–101. doi: http://doi.org/10.24025/2306-4412.4.2019.184512
  14. Kontsevoy, A., Kontsevoi, S. (2020). Modeling of a two-flow gas purification from carbon oxides (IV) by methyldiethanolamine solution. Technology Audit and Production Reserves, 5 (3 (55)), 34–37. doi: http://doi.org/10.15587/2706-5448.2020.214440
  15. Spravochnik azotchika: Fiziko-khimicheskie svoistva gazov i zhidkostei. Proizvodstvo tekhnologicheskikh gazov. Ochistka tekhnologicheskikh gazov. Sintez ammiaka (1986). Moscow: Khimiia, 512.

Downloads

Published

2020-12-30

How to Cite

Kontsevoy, A., & Kontsevoi, S. (2020). Calculations of two-flow regeneration of activated methyldiethanolamine solution. Technology Audit and Production Reserves, 6(3(56), 16–21. https://doi.org/10.15587/2706-5448.2020.220064

Issue

Vol. 6 No. 3(56) (2020): Chemical engineering

Section

Reports on research projects

License

Copyright (c) 2020 Andriy Kontsevoy, Sergii Kontsevoi, Sergii Kontsevoi, Sergii Kontsevoi

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

The consolidation and conditions for the transfer of copyright (identification of authorship) is carried out in the License Agreement. In particular, the authors reserve the right to the authorship of their manuscript and transfer the first publication of this work to the journal under the terms of the Creative Commons CC BY license. At the same time, they have the right to conclude on their own additional agreements concerning the non-exclusive distribution of the work in the form in which it was published by this journal, but provided that the link to the first publication of the article in this journal is preserved.