The Analysis and Optimum Design for Multi-Effect Arrangements
Date Issued
2011
Date
2011
Author(s)
Chao, Yu-Hsien
Abstract
The problem of energy shortage has become serious.
it is important to study useful methods for increasing the energy efficiency in process industries.
Distillation process is a typical unit that uses a lot of energy in chemical plants.The topics of
designing proper distillation column arrangements to utilize energy efficiently and lowering operating
cost while attaining the goal of protecting environment have become important research directions.
The concept of multi-effect distillation columns has already mentioned by Robinsson and Gilliand in 1950.
They proposed that by adjusting the pressure of two columns, the temperature difference of them would
be large enough to enable heat integration. And it can achieve the purpose of energy conservation and recovery.
Based on the Underwood''s equation and kings formula to calculate the theoretical minimum
vapor flow rate in a distillation column, the study attempts to discuss the relationship between the
feed conditions and the minimum vapor flow rate in three components multi-effect distillation system.
The results from three component separation problems are extended to multi-effects distillation columns
for separating four components. The potential energy savings when compared with the conventional
arrangement are investigated. The theoretical results are also confirmed by comparing its results
with those from Aspen Plus simulation.
Subjects
Minimum vapor flow rate
Prefractionator
Multi-effect distillation arrangements
Direct-split
Indirect-split
SDGs
Type
thesis
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