Optimal Multi-Plant HEN Retrofit Designs and Benefit Allocation Plans

Abstract

Energy efficiency has become an important issue in recent years due to serious problems caused by climate change and environmental pollution Interplant heat integration is one of effective ways to address this issue Generally the existing chemical plants in an industrial park were rarely constructed at the same time and each has already been equipped with an optimal HEN To further improve the energy efficiency of the entire park the retrofit designs of multi-plant HENs are developed in this study Since the HENs are traditionally revamped by solving a MINLP model to minimize the total annual cost (TAC) saving the resulting scheme may not be realized if the total benefit is not allocated to the participating plants fairly To resolve this profit distribution issue a two-stage procedure is proposed to generate the optimal multi-plant HEN retrofit designs and also the corresponding benefit allocation plan Three different revamp strategies are first utilized to generate the multi-plant retrofit designs via direct or indirect interplant heat exchanges The benefit allocation schemes are determined according to the core the Shapley values and the risk-based Shapley values in the second stage The Shapley values provide initial distribution plan based on the average marginal contributions of plants while the risk-based Shapley values take the additional expected loss of potential fallouts due to unplanned plant shutdowns into consideration The feasibilities of the above allocation plans can then be tested according to the criteria of core Finally the proposed methodology is illustrated in detail with a three-plant example

Date of Award	2020
Original language	English
Supervisor	Chuei-Tin Chang (Supervisor)