Indirect Organic Rankine Cycle for Waste Heat Recovery in Chemical Processes
Date Issued
2016
Date
2016
Author(s)
Li, Po-Yi
Abstract
An organic Rankine cycle (ORC) uses a low boiling point organic fluid as a working medium. Waste heat recovery is one of the most important development fields for the organic Rankine cycle (ORC).It can be applied to heat and power plants, or to industrial and farming processes. Some heat sources ,like hot exhausts from furnaces,which contains particles or sulfide might hurt pipes of evaporator.It is suggested to introduce water or heat transfer oil as an intermediate medium.In this paper, a mathematical model is presented for integrate ORC with the heat transfer oil recirculated as a intermediate fluid for recovering waste heat from the background process.A ORC-integrated superstructure considering all possible match of heat-exchange between process hot streams, recirculating hot oil and ORC is proposed.The possibility of several sets of ORC and recirculating hot oil also be concerned in the superstructure.On the basis of this superstructure, the model is formulated as a mixed-integer nonlinear program (MINLP).This MINLP model is designed and solved by a high-level modeling system, General Algebraic Modeling System (GAMS).A case about crude pre-heat train is solved to demonstrate the application of the proposed model for industrial waste heat recovery.Payback year method is applied to evaluate the cost of the additional capital equipment.
Subjects
indirect
hot transfer oil
organic rankine cycle
Superstructure
Mixed-integer nonlinear programming (MINLP)
Optimization
Type
thesis
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