Analise termodinamica de colunas de destilação visando a otimização energetica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

The aim of this work was to develop a procedure for reduction of energy requirement of distillation columns, by a combined energy-exergy analysis approach. In the energy analysis method, the reversible column profile is used to describe heat requirementlrejection along the column. Scope for the use of intermediate heat sources/sinks and reflux reduction can then be identified. In the exergy analysis method, the exergy losses due to stage irreversibilities are computes along the column, so that inefficient column sections can be readily identified. Both methods were implemented and applied to a set of binary and multicomponents systems. The comparison of the results obtained for each case showed that for binary c1ose-to-equimolar systems, both methods indicate the same column modifications. However, for systems with non-equimolar feed compositions, or more that two components, the profiles can easily indicate conflicting modifications, and the best option can be difficult to be identified. Both methods showed to be an interesting and efficient tool to analyze energy efficiency of distillation column. However, while the exergy approach uses a real column for analysis, the reversible profile approach is based on the ideal column concept, and for multicomponents systems the additional consideration of a binary component pair is required. This turns this method very sensitive to the choice of key-components. A method for choice of optimal key-components is proposed, but it requires the calculation of a full rigorous near-reversible profile

ASSUNTO(S)

destilação termodinamica

ACESSO AO ARTIGO

Documentos Relacionados