Matematički model Medupi elektrane, Južnoafrička Republika

master's thesis

• Title (english): Mathematical model uf Medupi power plant, South Africa
• Author: Mateja Radić
• Mentor: Mislav Čehil (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2015-12-04, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

Ekonomski razvoj Južnoafričke Republike uvjetovan je sigurnom opskrbom električne energije. U svrhu pokrivanja potrebnog baznog opterećenja, grade se dvije moderne termoelektrane na ugljen, Medupi i Kusile, svaka kapaciteta 4800 MW što čini 25 % trenutno raspoložive električne energije u Južnoj Africi. Radi nedostatka vode, kako pitke tako i rashladne, termoelektrane će imati zrakom hlađene kondenzatore koji će biti najveće postrojenje takvog tipa u Svijetu. Iskoristivost takvih kondenzatora ovisi ponajviše o vanjskim uvjetima zraka, prvenstveno o temperaturi koja je za to područje doseže preko 40 °C. U ovom diplomskom radu bit će napravljen proračun termoelektrane Medupi odnosno jedne njene jedinice od 800 MW. Proračunat će se i dati ovisnost iskoristivosti elektrane o promjeni vanjske temperature zraka i o površini kondenzatora.

U prvom dijelu rada detaljno je opisan rad moderne termoelektrane i svih njenih dijelova koje je potrebno poznavati kako bi se odredio njihov utjecaj na iskoristivost postrojenja. Dan je opis generatora pare, parne turbine, kondenzatora i električnog generatora.

U drugom dijelu opisana je termoelektrana Medupi te su dani svi tehnički podaci potrebni za proračun i matematički model same elektrane. Također je detaljno opisan rad zrakom hlađenih kondenzatora.

Na kraju je predstavljen matematički model rada elektrane te su prikazani rezultati u obliku dijagrama ovisnosti iskoristivosti postrojenja o vanjskim uvjetima i samoj izvedbi kondenzatora.

Abstract (english)

Economic development of South Africa depends of secure electric power supply. In order to cover the required base load, two modern coal power plants, Medupi and Kusile, are being built. The capacity of both plants is 4800 MW, which means total of 9600 MW, which is 25 % of currently available electric power in South Africa. Due to the lack of water, Medupi and Kusile will have an air – cooled condensers, which will be the largest condensers of this type in the World. Efficiency of these condensors depends largely on external air conditions, particularly air temperature, which for South African area reaches over 40 °C. This thesis consists of thermodynamic calculation of thermal power plant Medupi, i.e one of Medupi's 800 MW unit. Energy efficiency will be calculated depending on increase of external air temperature and on the surface of the condenser,.

First part of this thesis brings detailed description of energy production in modern coal power plant. All main parts of power plant are also described as they affect the most efficiency of cycle. Main components of coal power plant are steam generator, steam turbine, condenser, pump and electric generator.

Second part of thesis gives detailed description of Medupi coal power plant and also technical data required for calculation of mathematical model. Design of air – cooled condensers and also thermodynamic properties have been given in this part of thesis.

Last part of thesis presents a mathematical model of one of the Medupi's 800 MW power unit with diagram results of energy efficiency dependance on external conditions and geometry of condenser.

• Keywords: termoelektrana; zrakom hlađeni kondenzator; stupanj iskoristivosti; matematički model
• Keywords (english): thermal power plant; air – cooled condenser; energy efficiency; mathematical model
• Language: croatian
• URN:NBN: urn:nbn:hr:235:656630
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-22 15:22:06