Optimalno korištenje otpadne topline u parnoturbinskom ciklusu

Čehil, Mislav (2010) Optimalno korištenje otpadne topline u parnoturbinskom ciklusu. = Optimal waste heat utilization in the bottom steam-water cycle. Doctoral thesis , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Bogdan, Željko.

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02_05_2011_Doktorat_09032011_-_Mislav_Cehil_print.pdf Jezik dokumenta:Croatian

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Abstract (Croatian)

U radu je napravljen termodinamički model parnoturbinskog postrojenja koje se nalazi unutar kombiniranog postrojenja za proizvodnju električne energije. Kako bi se pronašao optimalan raspored izmjenjivačkih površina unutar generatora pare na otpadnu toplinu s više krugova pare, napravljena je mreža izmjenjivača topline unutar koje je svaki krug pare ili međupregrijač predstavljen s jednim stupcem u matrici izmjenjivača. Na taj način omogućen je proizvoljan raspored izmjenjivačkih površina unutar generatora pare s više krugova pare i s međupregrijanjem. Optimizacijska rutina određuje entalpijske priraste unutar svakog izmjenjivača te tlakove i masene protoke unutar svakog kruga pare. Funkciju cilja predstavlja maksimalan termodinamički stupanj iskoristivosti u slučaju termodinamičke optimizacije, a u slučaju termoekonomske optimizacije funkciju cilja čine minimalni termoekonomski gubici unutar parnoturbinskog ciklusa. Korišteni su genetski algoritmi kao robusna metoda traženja ekstrema funkcije cilja. U odnosu na dosadašnje radove u dostupnoj znanstvenoj literaturi, pokazano je kako postoje bolje konfiguracije generatora pare na otpadnu toplinu, uglavnom u obliku paralelnog smještaja izmjenjivača različitih krugova pare ili međupregrijača. Termodinamički i termoekonomski najbolje postrojenje je postrojenje s tri kruga pare i međupregrijanjem.

Abstract

In this work a thermodynamic model of a steam turbine power plant that is part of a combined cycle power plant was made. In order to find the best configuration of the heat exchangers inside the multi pressure heat recovery steam generator, heat exchangers network was made. In the heat exchangers network each pressure level of steam as well as steam superheating is presented with one separate column in the heat exchangers network. It allowed the arbitrary configuration of the heat exchangers within the multi pressure heat recovery steam generator. Optimization routine determines the enthalpy increment within each heat exchanger as well as pressure and steam mass flow for each pressure level. In the case of thermodynamic optimization, objective function is represented by the maximum thermodynamic efficiency, but in the case of thermoeconomic optimization objective function is made of minimal thermoeconomic losses in the steam turbine plant. Genetic algorithms were used as a robust method of finding an extreme of the objective function. In comparison to previous scientific research, it is shown that there are better configurations of the multi pressure heat recovery steam generator, mainly in the form of parallel position of heat exchangers of different pressure levels. Thermodynamic and thermoeconomic optimization showed that the best plant is the one with three steam pressure levels with superheating.

Item Type: Thesis (Doctoral thesis)
Uncontrolled Keywords: generator pare na otpadnu toplinu; parnoturbinsko postrojenje; kombinirani ciklus; pinch točka; termodinamička optimizacija; termoekonomska optimizacija
Keywords (Croatian): heat recovery steam generator; stam turbine power plant; combined cycle; pinch point; thermodynamic optimization; thermoeconomic optimization
Date Deposited: 22 Sep 2014 18:00
Last Modified: 16 Oct 2015 13:10
URI: http://repozitorij.fsb.hr/id/eprint/1305

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