The importance of control considerations for heat exchanger network synthesis: a case study

AUTOR(ES)

Oliveira, S.G., Liporace, F.S., Araújo, O.Q.F., Queiroz, E.M.

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2001-06

RESUMO

Cost optimization in the synthesis decision tree often leads to a reduced degree of freedom which degrades the process’s ability to reject disturbances as a consequence of low controllability. In fact, Heat Exchanger Networks (HENs) obtained by traditional synthesis procedures that ignore controllability aspects must be evaluated in this context a posteriori. The aim of this work was to develop a procedure that includes RGA and SVD measures of controllability, which are solely based on steady state information, thereby freeing the synthesis procedure of the cumbersome dynamic analysis. When a structure is defined during a traditional HEN synthesis procedure, a degree of freedom analysis is approached as a simulation problem. Next, an optimization is performed, since new variables are usually added to increase the degree of freedom of the HEN in order to render it controllable. A key point in the proposed procedure is the inference of controllability based on the proposed controllability measures, which also provide a control scheme by pairing controlled and manipulated variables during the process design. A HEN reported in the literature is used to illustrate the proposed procedure. The steady state simulator Aspen Plus and the dynamic simulator Aspen Dynamics (Aspentech, Inc.) were employed.

Documentos Relacionados

• MULTIVARIABLE OPTIMAL CONTROL OF A HEAT EXCHANGER NETWORK WITH BYPASSES
• The influence of heat exchanger design on the synthesis of heat exchanger networks
• Fluid dynamical considerations on heat exchanger networks
• Controle multivariável em redes de trocadores de calor com bypasses.
• Translational regulation of sigma 32 synthesis: requirement for an internal control element.