20.500.12556/RUL-137806 Idejni projekt ogrevalnih jam za slabe diplomsko delo Preliminary project of heating caves for slabs diploma work Jeklene slabe moramo pred procesom vročega valjanja ogreti v potisni peči na temperaturo preoblikovanja, kar je drag in energetsko potraten proces. Z idejo, da bi privarčevali z zemeljskim plinom ter naredili vročo valjarno bolj učinkovito, bomo zasnovali ogrevalne jame, kjer bi slabe ogreli za približno 100 °C s pomočjo odpadnih dimnih plinov iz potisne peči in lastnih gorilnikov, kar bi občutno zmanjšalo porabo zemeljskega plina. V okviru dela bomo izbrali gradnike jam ter gradnike cevovoda. Izračunali bomo izgube toplote skozi stene in pokrove jam, izgube toplote dimnih plinov v cevovodu ter porabo zemeljskega plina, ki bi ohranjal zadostno temperaturo v jamah ter obenem istočasno ogreval slabe. Določili bomo potreben čas za ogrevanje slabov v jamah ter dimenzionirali dimnik za odvod dimnih plinov. Na podlagi izvedenih toplotnotehničnih izračunov bomo ovrednotili porabo zemeljskega plina glede na idejni projekt in jo primerjali s sedanjo porabo. Before the hot rolling process, the steel slabs must be heated in a pressure furnace to the transformation temperature, which is an expensive and energy consuming process. With the idea of saving on natural gas and making the hot rolling mill more efficient, we have designed heating pits in which the slabs would be heated with natural gases from the pusher furnace and own burners by about 100 °C, which would significantly reduce natural gas consumption. As part of the work, we selected the building elements of the caves and the building elements of the pipeline. We calculated heat losses through the walls and covers of the caves, heat losses of the flue gases in the pipeline and the consumption of natural gas, which would maintain a sufficient temperature in the caves and at the same time heat the slabs. We determined the time required for heating the slabs in the pits and dimensioned the flue for natural gas discharge. Based on thermo-technical calculations, we will evaluate the consumption of natural gas according to preliminary project and compare it with current. jeklo slab ogrevalne jame potisna peč idejni projekt zemeljski plin steel slab heating caves pusher furnace preliminary project natural gas true false false [M. Bobnar] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2022-07-01 09:00:26 2022-07-01 09:00:28 2022-11-14 13:53:49 0000-00-00 00:00:00 2022 0 Ljubljana 0 Ljubljana XI, 31 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 669 84521 129254915 11620.pdf 11620.pdf 1 F6C9715A7CD62D9ACB27D15B8EBBBBE4 5306a555903b4471b7e5a2e3638e835b8a608e76e00cb1562848426a10781f65 47ef8e61-f90b-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157886 Naravoslovnotehniška fakulteta 0 0 0