A mathematical approach for retrofit and optimization of total site steam distribution networks |
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| Institution: | 1. Nuclear Engineering Department, Technical University of Madrid, José Gutiérrez Abascal 2, 28006 Madrid, Spain;2. Modeling and Simulation Department, Nuclear Safety Council (MOSI CSN), Justo Dorado 11, 28040 Madrid, Spain;1. Institute of Thermal and Environmental Engineering, Northeastern University, Shenyang 110819, Liaoning, China;2. Ansteel Research Institute of Iron and Steel, Anshan Iron and Steel Group Corporation, Anshan 114009, Liaoning, China;1. School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia;2. School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang 11800, Malaysia;3. Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA;1. School of Material and Energy, Guangdong University of Technology, No. 100 Waihuan Xi Road, Guangzhou Higher Education Mega Center, Panyu District, Guangzhou 510006, China;2. The Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA;3. Chemical Engineering Department, Universidad Michocana de San Nicolás de Hidalgo, Morelia, Michoacán 58060, Mexico |
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| Abstract: | This paper presents a generic mathematical model for retrofitting the steam power plants in an industrial site. The industrial sector under review consists of one steel mill, one oil refinery, and several petrochemical plants, where only small-scale steam integration has been implemented before this study. The relevant unit models in a typical steam power plant are established, and the steam plant retrofit problem is formulated as a mixed-integer nonlinear program (MINLP). Feasible retrofit alternatives suggested by experienced field engineers are investigated in sequence to examine the revenue of those possible modifications. The first scenario examines operational optimization of existent plants; the second option allows installation of one new turbine and replacement of several boilers and turbines with lower efficiency; the third scenario considers using a steam ejector to upgrade the disqualified import steam in the oil refinery. The significant merits from these three retrofit alternatives show that the proposed MINLP formulation has been a great help to enhance the inter-plant steam integration in an industrial sector. |
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| Keywords: | Steam power plant Mathematical programming Total site integration Mixed-integer nonlinear programming (MINLP) Process integration Retrofit Optimization |
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