Simultaneous synthesis of work exchange networks with heat integration

Abstract

The optimal integration of work and its interaction with heat can represent large energy savings in industrial plants. This paper introduces a new optimization model for the simultaneous synthesis of work exchange networks (WENs), with heat integration for the optimal pressure recovery of process gaseous streams. The proposed approach for the WEN synthesis is analogous to the well-known problem of synthesis of heat exchanger networks In all case studies, the heat integration between WEN stages is essential to improve the pressure recovery, and to reduce the total costs involved in the process.

Heat and work integration: Fundamental insights and applications to carbon dioxide capture processes

“…The work was further extended by Onishi et al [18] using a superstructure to minimize total annualized cost. The same authors also investigated superstructures for work exchange networks that interact with HENs with respect to grassroots design [19]. The methodology was later extended to enable its application in retrofit design [20].…”

Inter-process Heat Integration by Coordination among Agent Systems for Heat Exchanger Network Design

“…Although the concept of pinch technology is involved in some process simulation software, the skilled engineers' considerations are still necessary to obtain preferable HENs. Onishi et al (2014) proposed a multi-stage superstructure using MINLP to synthesize work exchange and heat integration simultaneously. We have set up several kinds of agent, for example "Project Manager", "Energy Cost Manager" and "HEN Design Agent".…”

Retrofit of heat exchanger networks with pressure recovery of process streams at sub-ambient conditions

“…In mathematical programming, HENs retrofit is considered as an optimization problem, comprising the field with the highest advances due to its ability to obtain better solutions. Yee and Grossmann [23] presented a mathematical approach to Clearly, it is possible to integrate heat and work in the same network in order to save energy and reduce process costs as indicated in the references [28,29,31,32,37]. Doubtless, this concept can be extended to the retrofit problem of existing HENs with significant advantages.…”

“…The authors demonstrated through the study of various configuration possibilities including expanders and compressors that the pressure recovery during the HEN design reduces the need for thermal utilities, decreasing the process total cost. Onishi et al [29] presented a MINLP-based model for the synthesis of work exchange networks (WENs) formulated analogously to the optimization problem of HENs design. Thus, high-pressure and low-pressure streams exchange work through pressure manipulation equipment acting on a common shaft to minimize the total cost.…”