A discrete and continuous mathematical model for the optimal synthesis and design of dual pressure heat recovery steam generators coupled to two steam turbines. (15th May 2016)

• Record Type: Journal Article
• Authors: Manassaldi, Juan I.; Arias, Ana M.; Scenna, Nicolás J.; Mussati, Miguel C.; Mussati, Sergio F.
• Is Part Of: Energy. Volume 103(2016)
• Page Start: 807
• Page End: 823
• Publication Date: 2016-05-15
• Subjects: HRSGs (Heat recovery steam generators) -- Combined cycle power plants -- Mathematical programming approaches -- MINLP models -- GAMS (General Algebraic Modeling System) -- Optimal synthesis and design; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2016.02.129
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: This paper addresses the optimal arrangement and design of a dual pressure heat recovery steam generator coupled to two steam turbines. A superstructure that embeds various alternative configurations is optimized considering the following two single objective functions: (a) the maximization of the total net power generation for a given total heat transfer area and (b) the minimization of the total heat transfer area for a given total net power. The optimal number of heat exchangers and pumps and how they should be connected are the discrete decisions. The dimensions and operating conditions are the continuous decisions. A discrete and continuous mathematical model is developed and logical propositions are used for discrete decisions. The results are compared with a reference case reported by other authors. The results indicated that the optimization of the proposed superstructure allowed to find a more efficient HRSG configuration. The obtained configurations differ from the configuration of the reference case in how the heat exchangers and pumps are connected. A considerable increase in about 8% of the total net power generation in (a) and a significant reduction in about 24% of the total heat transfer area in (b) are achieved when compared to the reference case. Highlights: MINLP model to optimize 2-P HRSG coupled to two steam turbines is developed. Obtained configurations are compared with a reference case taken from the literature. Obtained configurations are more efficient than the reference case.