The Simulation and Control of Ammonia Unit of Shiraz Petrochemical Complex, Iran

Document Type : Original Paper

Authors

Department of Chemical Engineering, Faculty of engineering, University of Sistan and Baluchestan, Zahedan, Iran

Abstract

The aim of this paper is the steady state and dynamic simulations of the ammonia unit of Shiraz petrochemical complex and system behavior study versus the feed flow rate change for producing a good quality product. The ammonia unit consists of the reformer units, shift converter units, carbon dioxide absorption unit, methanation unit, and ammonia synthesis unit. For this purpose, in the first step, the ammonia unit is simulated at a steady state using the Aspen Plus 2006.5 simulator. In the following stage, the required parameters are entered into the software for the dynamic simulation. The Aspen Plus was exported to Aspen dynamic. In this study, PI and PID controllers, as basic controllers, were automatically added and tuned by the Tyreus–Luyben tuning method. Finally, in order to ensure the accuracy of the proposed control structure, the feed flow rate increased by 5%. The results show that, first of all, the simulation accuracy at steady and dynamic states are optimal so that the mean errors are -0.01% and -0.02% for steady and dynamic states, respectively. The controlling structure can well control the 5% feed increase.

Keywords

References

[1] Khodadoost, M. and Sadeghi, J. (2011). “Dynamic Simulation of Distillation Sequences in Dew Pointing Unit of South Pars Gas Refinery.” Journal of Chemical and Petroleum Engineering, Vol. 45, No.2, pp. 109-116.
[2] Bequette, B. W. (1998). “Process Dynamics Modeling, Analysis and Simulation.” Prentice Hall PTR, New Jersey.
[3] Reddy, K. V. and Husaln, A. (1982). “ Model-ing and Simulation of an ammonia synthesis loop.” Industrial & Engineering Chemistry Process Design and Development Vol. 21, No. 3, pp. 359-367.
[4] Pedernera, M. N., Borio, D. O. and Schbib, N. S. (1999). “Steady state analysis and optimization of a radial-flow ammonia synthesis reactor.” Computers & Chemical Engineering, Vol. 23, pp. 783-786.
[5] Rahimpour, M. R. and Kashkooli, A. Z. (2004). “Modeling and simulation of industrial carbon dioxide absorber using amine-promoted potash solution.” Iranian Journal of Science & Technology, Transaction B, Vol. 28, No. B6. pp. 656-666.
[6] Akpa, J. G. and Raphael, N. (2014). “Optimization of an ammonia synthesis convertor.” world Journal of Engineering and Technology, Vol. 2, No. 4, pp. 305-313
[7] Abashar, M. E. E., Alhumaizi, K. I. and Adris A. M. (2003). “Investigation of methane-steam reforming in fluidized bed membrane reactors.” Institution of chemical engineers, Vol. 81, No. 2, pp. 251-258.
[8] De Smet, C. R. H., De croon, M. H. J. M., Berger, R. J., Marin, G. B. and Schouten, J. C. (2001). “Design of adiabatic fixed-bed reactors for the partial oxidation of methane to synthesized gas. Application to production of methanol and hydrogen-for-fuel-cells.” Chemical engineering science, Vol. 56, No. 16, pp.4849-4861.
[9] Rajesh, J. K., Gupta, S. K., Rangaiah, G. P. and Ray, A. K. (2001). “Multi-objective Optimization of industrial hydrogen plants.” Chemical engineering science, Vol. 56, No. 3, pp. 999-1010.
[10] Seader, J. D., Henley, E. J. and Ropert, D. K. (2010). Separation process principles. 3rd. Ed. Chapter 6, John Wiley & Sons, Inc., Hoboken.
[11] Nikacevic, N., Jovanovic, M. and Petkovska, M. (2011). “Enhanced ammonia synthesis in multifunctional reactor with in situ adsorption.” chemical engineering research and design, Vol. 89, No. 4, pp. 398–404.
[12] Levenspiel, O. (1999). Chemical reaction engineering. 3td. Ed. Chapter 2, John Wiley & Sons, Inc., Hoboken.
Journal of Chemical and Petroleum Engineering
Volume 52, Issue 2
December 2018
Pages 107-122

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History

  • Receive Date: 22 October 2016
  • Revise Date: 13 September 2018
  • Accept Date: 04 October 2018

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