Multi-Period Optimization in the Retrofit of Combined Heat and Power (CHP) Systems

EasyChair Preprint 523

Abstract

In this work we present a mathematical model for demonstrating how an existing combined heat and power (CHP) plants based on different pressure levels of steam demands, which also integrates the heat derived from processes, can be retrofitted, when extant equipment cannot satisfy current multi-period steam and power loads. To maintain operational stability and flexibility, chemical processes can input steam and electricity as required through a combined heat and power system (CHP) as shown in Fig. 1. With increased steam and power loads, the retrofit optimization problem considers the multi-period operation strategy of the CHP systems, including the decisions on the acquisition of new equipment units. Feasible CHP retrofitting superstructures are constructed, based on which the CHP retrofit tasks can be transformed into mixed-integer nonlinear programming (MINLP) optimization problems. The retrofit target of the two cases is aimed at minimizing total annual cost.

Keyphrases: CHP, MINLP, multi-period optimization

@booklet{EasyChair:523,
  author    = {Shueh-Hen Cheng and Ta-Chen Lin},
  title     = {Multi-Period Optimization in the Retrofit of Combined Heat and Power (CHP) Systems},
  howpublished = {EasyChair Preprint 523},
  year      = {EasyChair, 2018}}