Design of heat exchanger network using pinch method
Chemical or oil refineiy processes utilize huge amounts o f energy in their routine operations. Therefore, it is vital for such industries to find ways o f maximizin g the use o f energy and make the system more efficient through reduction in energy, water and raw material consumption. Wast e...
Saved in:
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
2006
|
Subjects: | |
Online Access: | http://eprints.uthm.edu.my/7124/1/24p%20WAN%20NURDIYANA%20WAN%20MANSOR.pdf |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | Chemical or oil refineiy processes utilize huge amounts o f energy in their routine
operations. Therefore, it is vital for such industries to find ways o f maximizin g the use
o f energy and make the system more efficient through reduction in energy, water and
raw material consumption. Wast e energy can be transferred to another process and that
wil l increase the profitability o f the industries. Whe n the use o f a heat exchanger
network (HEN) is considered for these tasks, the framewor k developed in this study can
be implemented to mak e a cost-benefit analysis.
This thesis represents a framewor k for generating the HE N over a specified range
o f variations in the flo w rates and temperature o f the streams. So that the heat exchanger
area, numbe r o f heat exchange units and load on the heat exchangers can be estimated.
T he proposed method to analyze and design the HE N is called pinch method, which is
one o f the most practical tools and used to improve the efficiency o f energy usage, fuel
and water consumption in industrial processes. This method investigates the energy
flows within a process and identifies the most economical ways o f maximizing heat
recovery. This method consists o f five major steps to follow, which wil l finally lead to
H E N design. Th e steps are: (1 ) choose a minimu m temperature approach temperature
(DTmin) , (2 ) construct a temperature interval diagram, (3 ) construct a cascade diagram
and determine the minimu m utility requirements and the pinch temperature, (4 ) calculate
the minimu m number o f heat exchangers above and below the pinch and (5) construct
the heat exchanger network.
T h e emphasis o f this work has been on the designing o f the HEN . However, to
demonstrate the practical implications o f pinch analysis, DTmi n and the heat exchanger
costs, it is necessary to estimate the heat transfer area o f the HEN , which wil l help in
arriving at the total cost including capital and running costs o f the designed HEN . Th e
effect o f changing the DTmi n gave a good indication on the overall costs. |
---|