ENG  Vol.4 No.10 , October 2012
Three-Level Control of a Distillation Column
Abstract
In this simulation study the operation of conventional distillation column (column with one feed and two products) was investigated with the application of AspenPlus DynamicsTM software. Control structures of the column which separate a two-component mixture were studied. The aim of our investigations was to discover dynamic and steady-state effects of heating and cooling on tray temperatures. The relationship of the tray temperatures and the purity of products were also identified. Based on the identified relationships a three level hierarchical control structure was developed. On the lowest level of the hierarchy there are the local controllers of heating and cooling. On the middle level of the control hierarchy the process variables are two tray temperatures and the output of the controllers is the set point of local controllers. On the top level of the control hierarchy the purity of the products are controlled over by manipulating the set point of the temperature controllers. This paper presents the functions of the control hierarchies and the middle level of the control hierarchy was analyzed in detail.

Cite this paper
L. Szabó, S. Németh and F. Szeifert, "Three-Level Control of a Distillation Column," Engineering, Vol. 4 No. 10, 2012, pp. 675-681. doi: 10.4236/eng.2012.410086.
References

[1]   K. Mansour and E. Mansour, “Rigorous Optimization of Heat-Integrated and Petlyuk Column Distillation Configurations Based on Feed Conditions,” Clean Technologies and Environmental Policy, Vol. 11, No. 1, 2009, pp. 107-113.

[2]   S. Skogestad and M. Morari, “The Dominate Time Constant for Distillation Columns,” Computers & Chemical Engineering, Vol. 11, No. 6, 1987, pp. 607-617. doi:10.1016/0098-1354(87)87006-0

[3]   P. S. Buckley, “Techniques of Process Control,” Wiley, London, 1964.

[4]   J. Abonyi, “Fuzzy Modell Identification for Control,” Birkh?user, Boston, 2003. doi:10.1007/978-1-4612-0027-7_4

[5]   S. Skogestad, “Dynamics and Control of Distillation Columns: A Tutorial Introduction,” Chemical Engineering Research and Design, Vol. 75, No. 6, 1997, pp. 539562. doi:10.1205/026387697524092

[6]   S. J. Benz1 and N. J. Scennal, “An Extensive Analysis on the Start-Up of a Simple Distillation Column with Multiple Steady States,” The Canadian Journal of Chemical Engineering, Vol. 80, No. 5, 2002, pp. 865-881. doi:10.1002/cjce.5450800510

[7]   N. Sharma and K. Singh, “Control of Reactive Distillation Column: A Review,” International Journal of Chemical Reactor Engineering, Vol. 8, No. 1, 2010.

[8]   W. L. Luyben, “Process Modeling, Simulation, and Control for Chemical Engineers,” 2nd Edition, McGraw-Hill College, Singapore City, 1990.

 
 
Top