STRENGTH ANALYSIS OF PIPE BRANCH TO DRUM SHELL JUNCTION SUBJECTED TO PRIMARY AND SECONDARY LOADING

U ovom diplomskom radu napravljen je proračun čvrstoće priključaka na bubanj djelovanjem primarnog i sekundarnog opterećenja. Budući se bubanj iz proračuna koristi u kotlu spalionice otpada, njen princip rada ukratko je opisan u uvodu. U nastavku je pojašnjeno što je to kotao (generator pare), koji su njegovi sastavni dijelovi i dana je podjela kotlova na osnovu različitih kriterija. Zatim slijede opširnije informacije o vodocijevnom parnom kotlu. Za kraj teorijskog dijela opisan je princip rada bubnja, opterećenja koja se pojavljuju, koji materijali se koriste za njihovu izradu i prikazani su detalji zavarenih spojeva priključaka na bubnju. Također, navedene su norme koje se koriste za proračun neloženih tlačnih posuda, a primjenjuju se i za proračun bubnjeva. Koristeći se normom EN 13445-3, izrađen je analitički proračun priključaka na bubanj, od kojih je jedan glavna spusna cijev. Tim proračunom provjeren je utjecaj unutarnjih sila i momenata na priključak. Nakon toga, isti proračun proveden je u programskom paketu PROBAD, kako bi se usporedili i analizirali rezultati.In this thesis, the strength calculation of the connections on the drum by the action of primary and secondary load is made. Since the drum from the calculation is used in the boiler of waste incinerator, its working principle is briefly described in the introduction. Iti s explained below what a boiler (steam generator) is, which are its constituent parts, and the divison of boilers is given on the basis of different criteria. This is followed by more detailed informations about the water-tube steam boiler. At the end of the theoretical part, the principle of operation of the drum is described, the loads that occur, what materials are used for their production and the details of the welded joints of the connections on the drum are presented. Also, the norms used for calculation of unfired pressure vessels are listed, and they are also applied for the calculation of drums. Using the European Standard EN 13445-3, an analytical calculation of the drum connections was made, of which one is the main downcomer. Using this calculation, it is checked the influence of inner forces and moments on the connection. After that, the same calculation was proven in the PROBAD software package, in order to compare and analyze the results