Heat and power integration

This chapter introduces several algorithmic approaches that have been developed for process integration to satisfy the cooling, heating, and power demands of a process. After studyii this material, the reader should 

Be able to design a network to meet the MER targets that is, to position heat exchai eis in a network, assuming overall heat-transfer coefficients. Two methods ate introduced a unit-by-unit method beginning at the closest-approach temperature difframce (the pinch), and the formulation and solution of a mixed-integer linear m ram (MILP). 

Be able to design a network when the minimum approach temperatiue is below a threshold value, at which either heating or cooling utility is used, but not both. 

Be able to use the grand composite curve to assist in the selection and positioning of appropriate types of hot and cold utilities in the network. 

Understand the importance of the specified minimum approach temperature difference on the design of a heat exchanger network (HEN). 

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Posada, A. and Manousiouthakis, V. Heat and power integration of methane reforming based hydrogen production. Industrial Engineering Chemistry Research, 2005, 44 (24), 9113. 

The next two alternatives do not affect the distribution of chemicals and are usually considered for moderately exothermic reactions, later in process synthesis— that is, during heat and power integration, when opportunities are considered for heat exchange between high-and low-temperature streams. 

As mentioned in the previous section, it is common to consider the integration of all temperature-and pressure-change operations. This is referred to as heat and power integration and is covered in Chapter 10 after important thermodynamic considerations are presented first in Chapter 9. At this point, however, there are several important heuristics that are useful in determining what type of operations to insert into the flowsheet to increase or decrease pressure. Details of the equipment used to perform pressure-change operations are presented in Chapter 15. 

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