Air Separation Units (ASUs) Simulation Using Aspen Hysys® at Oxinor I of Air Liquid Chile S.A Plant

C.A. Leiva 1 , D.A. Poblete 1 , T.L. Aguilera 1 , C.A. Acuña 2  and F.J. Quintero 3
  • 1 Department of Chemical Engineering, Universidad Católica del Norte, Chile
  • 2 Department of Chemical and Environmental Engineering, Universidad Técnica Federico Santa María, 2390123, Valparaíso, Chile
  • 3 , Santiago, Chile

Abstract

The method used to extract copper from its ores depends on the nature of the ore. The main process currently to separate copper from sulphide ores is the smelting process. The concentrated ore is heated strongly with silicon dioxide (silica), calcium carbonate and oxygen enriched air in a furnace or series of furnaces which is carried out using the injection of the air for oxidation the Fe and Si present in the raw material. Oxygen can be produced using several different methods. One of these methods is Air separation process, which separates atmospheric air into its primary components, typically nitrogen and oxygen, and sometimes also argon and other rare inert gases by cryogenic distillation. In this paper, simulation of air separation units (ASUs) was studied using Aspen Hysys®. The obtained simulation and model was validated with the operational data from the Oxinor I of Air Liquide S.A Plant. The ASU was divided into subsystems to perform the simulations. Each subsystem was validated separately and later on integrated into a single simulation. An absolute error of 1% and 1.5% was achieved between the simulated and observed the process variables(s). This indicated that Aspen Hysys® has the thermodynamic packages and required tools to perform simulations in cryogenic processes at industrial scale.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • 1. Cochilco. Cochilco – Estadísticas (2016). http://www.cochilco.cl:4040/boletin-web/pages/tabla16/buscar.jsf (accessed February 9, 2017).

  • 2. Smith, AR & Klosek, J.A. (2001). Review of Air Separation Technol. and Their Integration with Energy Conversion Processes. Fuel Process Technol. 70, 115–34. DOI: 10.1016/S0378-3820(01)00131-X.

  • 3. Wang, M., Oyedun, A.O., Pahija, E., Zhu, Y., Liu, G. & Hui, CW. (2015). Integration and optimization of an air separation unit (ASU) in an IGCC plant. 12th International Symposium on Process Systems Engineering and 25th European Symposium on Computer Aided Process Engineering. vol. 37. DOI: 10.1016/B978-0-444-63578-5.50080-3.

  • 4. Asma-Ul-Husna, Razia, H.Sk., Aysha, R. & Muhammad Ruhul, A. (2015). Energy saving in cryogenic air separation process applying self heat recuperation technology. Int. Conf. Mechanical Eng. Renew., Chittagong: ICMERE201. 5, p. 26–9.

  • 5. Cao, Y., Swartz, CLE, Baldea, M. & Blouin, S. (2015). Optimization-based assessment of design limitations to air separation plant agility in demand response scenarios. J. Process Control. 33, 37–48. DOI: 10.1016/j.jprocont.2015.05.002.

  • 6. Van Der Ham, L.V. (2012 ). Improving the exergy efficiency of a cryogenic air separation unit as part of an integrated gasification combined cycle. Energy Convers Manag. 61, 31–42. DOI: 10.1016/j.enconman.2012.03.004.

  • 7. Vila, P.L.C. & Serrano, M.A.L. (2002). Optimización de plantas criogénicas de producción de oxígeno. 15, 2509–14.

  • 8. Kim, Y.S., Park, S.K., Lee, J.J., Kang, D.W. & Kim, T.S. (2013). Analysis of the impact of gas turbine modifications in integrated gasification combined cycle power plants. Energy. 55, 977–86. DOI: 10.1016/j.energy.2013.03.041.

  • 9. Al-Lagtah, N.M.A., Al-Habsi, S. & Onaizi, S.A. (2015). Optimization and performance improvement of Lekhwair natural gas sweetening plant using Aspen HYSYS. J. Nat. Gas. Sci. Eng. 26, 367–81. DOI: 10.1016/j.jngse.2015.06.030.

  • 10. Jieyu, Z., Yanzhong, L., Guangpeng, L. & Biao, S. (2015). Simulation of a Novel Single-column Cryogenic Air Separation Process Using LNG Cold Energy. Phys. Procedia. 67, 116–22. DOI: 10.1016/j.phpro.2015.06.021.

  • 11. Hart, A. & Gnanendran, N. (2009). Cryogenic CO2 capture in natural gas. Energy Procedia. 1, 697–706. DOI: 10.1016/j.egypro.2009.01.092.

  • 12. Proust, P. & Vera, J.H. (1989). PRSV: The stryjek & vera modification of the peng-robinson equation of state. Parameters for other pure compounds of industrial interest. Can. J. Chem. Eng. 67, 170–3. DOI: 10.1002/cjce.5450670125.

OPEN ACCESS

Journal + Issues

Search