Tehnološki i konstrukcijski proračun rekuperatora za predgrijanje zraka na kupolnoj peći

master's thesis

• Title (english): Technological and constructional calculation of the recuperators for air preheating on the cupola furnace
• Author: Marin Pomahač
• Mentor: Ladislav Lazić (mentor)
• Committee member: Zdenka Zovko Brodarac (predsjednik povjerenstva)
• Committee member: Ladislav Lazić (član povjerenstva)
• Committee member: Martina Lovrenić-Jugović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2023-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract

U slučajevima pripreme taline za proizvodnju odljevaka većih tonaža, najčešća metoda taljenja u ljevaonicama lijevanog željeza je kupolna peć. Glavne prednosti kupolnih peći u usporedbi s električnim su: manje su osjetljive na nekvalitetne sirovine i onečišćenja, reakcije oksidacije i redukcije odvijaju se unutar i iznad zone taline tijekom procesa taljenja, što omogućuje korištenje visoko oksidiranog i nekvalitetnog otpadnog materijala, niže cijene legura i nemetalnih dodataka. Metalurški proces u kupolnoj peći može se intenzivirati predgrijavanjem zraka koji se kroz mlaznice upuhuje u radni prostor peći. Osim povećanja produktivnosti agregata, postiže se i smanjena potrošnja koksa te više temperature taline. Za kupolnu peć kapaciteta 3 t/h izvršen je tehnološko-konstrukcijski proračun sekcija rekuperatora. Proračun se temelji na eksperimentalnim podacima peći i rekuperatora koji se koriste u praksi. Kako bi se
postigla temperatura struje vrućeg zraka do 600°C i iskoristila energija povezana s emisijom CO u otpadnim plinovima, usvojen je sustav oporabe otpadnog plina koji se sastoji od tri sekcije rekuperatora. U prvom, teoretskom dijelu, dat je opis kupolnih peći, opis i podjela rekuperatora i njihove konstrukcijske razlike, te opis prijenosa energije u rekuperatoru. U drugom dijelu diplomskog rada izvršen je tehnološko-konstrukcijski proračun sekcija rekuperatora.

Abstract (english)

In cases of melt preparation for larger tonnage production, the most common melting used in cast iron foundries is the cupola furnace. The main advantages of cupola furnaces compared to electric ones are: less sensitive to low quality charge materials and contaminants,
oxidation and reduction reactions take place within and above the melt zone during cupola melting, which allows the use of highly oxidized and low quality scrap material, lower prices of alloys and non-metallic additions. The metallurgical process in the cupola furnace can be
intensified by preheating the air that is blown into the working space of the furnace through nozzles. In addition to increasing aggregate productivity, reduced coke consumption and higher
melt temperatures are also achieved. For the cupola furnace with a capacity of 3 t/h, the technological and constructional calculation of the recuperator sections was carried out. The calculation is based on the experimental data of furnaces and recuperators that are used in practice. In order to reach the temperature of the hot air blast up to 600°C and to use the energy associated with CO emission in the waste gases, the recovery waste gas system consisting of three recuperator sections was adopted. In the first, theoretical part, there is a description of
cupola furnaces, a description and division of recuperators and their structural differences, and adescription of energy transfer in the recuperator. In the second part of the thesis, the technological and construction calculation of the recuperator sections was carried out.

• Keywords: Kupolna peć; predgrijanje zraka; rekuperator
• Keywords (english): cupola furnace; air preheating; recuperator
• Language: croatian
• URN:NBN: urn:nbn:hr:115:438770
• Study programme: Title: Graduate study program Metallurgy; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka metalurgije (magistar/magistra inženjer/inženjerka metalurgije)
• Type of resource: Other
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-09-21 08:00:21