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Title: Control degrees of freedom using the restraining number: Further evaluation
Authors: Vasudevan, S.
Konda, N.V.S.N.M.
Rangaiah, G.P. 
Keywords: Control degrees of freedom
Nonlinear processes
Process engineering
Restraining number
Issue Date: Nov-2008
Source: Vasudevan, S., Konda, N.V.S.N.M., Rangaiah, G.P. (2008-11). Control degrees of freedom using the restraining number: Further evaluation. Asia-Pacific Journal of Chemical Engineering 3 (6) : 638-647. ScholarBank@NUS Repository.
Abstract: A simple and effective procedure for the computation of control degrees of freedom (CDOF) using the concept of restraining number has been recently proposed by our group. The goal of the present contribution is to further evaluate and enhance this procedure. The restraining number is applied to a few more important units. In particular, a detailed analysis has been done for determining the restraining number of membrane separators, given their increasing importance in the industry today. The restraining number procedure is then successfully applied to compute the CDOF of several industrial-scale processes with distinctly unique characteristics. The simplicity, reliability, general applicability and effectiveness of the procedure are thus further demonstrated. To sum up, the present contribution improves upon and details the CDOF procedure clearly, discusses further issues like the restraining number for variable speed pumps and membrane separators, redundancies for absorbers and strippers and finally, the applicability of this procedure to three-phase distillation columns and complex industrial processes. © 2008 Curtin University of Technology and John Wiley & Sons, Ltd.
Source Title: Asia-Pacific Journal of Chemical Engineering
ISSN: 19322135
DOI: 10.1002/apj.117
Appears in Collections:Staff Publications

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