Targeting procedures for energy savings by heat integration across plants

Heat integration across plants can be accomplished either directly using process streams or indirectly using intermediate fluids. By applying pinch analysis to a system of two plants, it is first shown that the heat transfer leading effectively to energy savings occurs at temperature levels between...

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Bibliographic Details
Published in:AIChE journal 1999-08, Vol.45 (8), p.1721-1742
Main Authors: Rodera, Hernán, Bagajewicz, Miguel J.
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Rational use of energy: conservation and recovery of energy
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Summary:Heat integration across plants can be accomplished either directly using process streams or indirectly using intermediate fluids. By applying pinch analysis to a system of two plants, it is first shown that the heat transfer leading effectively to energy savings occurs at temperature levels between the pinch points of both plants. In some cases, however, heat transfer in other regions is required to attain maximum savings. A systematic procedure to identify energy‐saving targets is discussed, as well as a strategy to determine the minimum number of intermediate‐fluid circuits needed to achieve maximum savings. An MILP problem is proposed to determine the optimum location of the intermediate fluid circuits. The use of steam as intermediate fluid and extensions to a system of more than two plants are discussed.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690450810