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Design of the optimal total site heat recovery system using SSSP approach
Andreja Goršek, Peter Glavič, Miloš Bogataj, 2006, izvirni znanstveni članek

Opis: Site expansions or changes in production capacities are usually related with changes of utilities demands andžor utility system design. Despite several available and well established techniques for process synthesis and integration, very often, changes in process designs are made on the basis of intuition and experiences of engineers. In this paper possibilities of rational energy consumption and energy integration in an existing site for production of specialty chemicals were studied. On the basis of real process parameters and computer simulation results energy integration was re-examined.Total site analysis using modified Site Sink Source Profiles, which gives a profound insight into the site utility system configuration, heating-cooling demands and cogeneration design was performed. The existing site was found to be very well designed. With only few modifications additional 9% of hot utilities and 5% of cold utilities savings are possible.
Ključne besede: chemical engineering, process design, optimization, heat integration, cogeneration, pinch method, energy retrofit
Objavljeno: 30.05.2012; Ogledov: 1894; Prenosov: 67
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Multiperiod investment models for the gradual reconstruction of chemical processes
Zorka Novak-Pintarič, Zdravko Kravanja, 2007, izvirni znanstveni članek

Opis: A multiperiod mixed-integer nonlinear programming (MINLP) model is presented for planning an optimal investment policy for the gradual retrofit of chemical plants over a specified time frame. This approach can be applied when the available funds are insufficient to perform the optimal reconstruction at once. Through gradual improvements, the process progressively approaches its optimum with considerably lower requirements for new capital whilst still exhibiting an attractive increase in economic performance. In the proposed multiperiod problem for gradual retrofit, certain amounts of capital enter into the periods for the gradual increase of equipment, in order to improve the performance of the process, e.g. increase in conversion or energy recovery. This capital may arise from internal sources of the company or can be borrowed. The financial benefits resulting from the improvements at the end of the periods can be reinvested for additional reconstruction over the next periods. In this way, self-sustained capital generation for future reconstruction is achieved, and any additional funds required minimized. The objective function of the proposed problem is formulated as the net present worth of the gradually retrofitted system. This enables several techno-economic analyses to be performed. The proposed multiperiod investment strategies are illustrated by an investment planning example for the retrofit of a heat-exchanger network.
Ključne besede: chemical processing, process design, process retrofit, investment, modeling, processing, techno-economic criteria
Objavljeno: 31.05.2012; Ogledov: 1033; Prenosov: 100
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