| Summary: | 碩士 === 淡江大學 === 化學工程學系 === 91 === Heat integration is an important issue in a variety of industries such as petroleum, chemicals, petrochemicals, steel, cement, and so forth. Since the large increase in the cost of fuel/energy starting in the early 1970s, it has been playing an important role in making energy savings.
Pinch technology, one of the heat-integrating technologies, consists of the following four steps:
1. data extraction;
2. pinch analysis;
3. heat exchanger network synthesis;
4. selection of alternatives.
In this thesis, two existing chemical processes, one is “the dehydrogenation of isopropyl alcohol (IPA) to produce acetone” and the other is “the hydrodealkylation of toluene to produce benzene”, were simulated first by using ASPEN PLUS which is a well-known commercial software in the process simulation. T-Q diagram can be obtained in this stage, then taken into account later. Next, HEN designs were proceeded by using SUPERTARGET, a well-repeated commercial software, to construct the heat exchanger network and make the trade-off of the cost in process. After retrofitting the above-mentioned processes by a series of modifications, we can obtain an optimum design, a better heat-exchanger network, than ever before. Eventually, we can obtain more and more savings in total cost.
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