4689 KB0 KB201320252021Strušnik, Dušanletnik:14številka:iss. 4str. 21-39ISSN:1855-5748COBISSID_HOST:99777027URN:URN:NBN:SI:doc-885AVSR3enFakulteta za energetikoJET on-lineJournal of energy technologyboilerductflue gasheat recoverystacksteam generatorsuperheaterHRSG system description and water-steam analysis at the hrsg cold start-up| Opis sistema HRSG in analiza vodepare pri hladnem zagonu|The basic purpose of this paper is to present the HRSG system description in detail and possibility analysis of preventing the HRSH water-steam generated release into the atmosphere through the sky valves during the HRSG cold start-up. The steam released into the atmosphere by the cross sky valve is not an adequate solution for the following reasons: Noise prevention, water losses, thermal heat release into the environment, etc. In this paper, the possibilities and solutions are investigated in order to avoid the HRSG start-up sky venting. For this purpose, the steam quality data at HRSG cold start-up is analysed, and the possibility is examined of discharging the HRSG generated steam at the start-up via a new start-up pipeline into the existing dump condenser, or into the start-up flash tank or into the blowdown tank. The results show that, at the first 3 minutes of cold start-up, the HRSG generated only water, and this water should not be discharged into the HP or IP pipeline headers. The HRSG generates a mixture of water and steam only after 4 minutes from the start-up. For that reason it is not recommended to drain the water-steam mixture at the HRSG start-up into the new start-up pipeline, but it is recommended to drain the water and steam mixture formed during the HRSG start-up into the new start-up flash tank, or into the blowdown tank. The flash tank, and also the blowdown tank, should be appropriately dimensionedOsnovni namen prispevka je podrobna predstavitev HRSG-ja in analiza možnosti zmanjšanja izpusta generirane pare v atmosfero ob hladnem zagonu. Izpust zagonske pare v atmosfero ni najboljša možna rešitev, saj se s tem poveča zvočna obremenitev okolja, odvod kotlovske vode in toplotne energije v okolje itd. V tem prispevku so analizirane možne rešitve preprečitve odvoda zagonske pare v atmosfero, tako da se mešanica vode-pare ob hladnem zagonu HRSG-ja odvede v novi zagonski parovod, separatorsko posodo ali v posodo za odvodnjavanje. Analizirani pa so bili tudi podatki kvalitete pare ob zagonu HRSG-ja. Rezultati pokažejo, da prve 3 minute HRSG generira samo vodo, ki pa se ne sme odvesti v HP oziroma IP zbiralno kom parovoda. Šele po 4 minutah HRSG prične generirati mešanico vode-pare. Zato se pri hladnem zagonu ne priporoča odvod generirane pare v novi zagonski parovod, ampak da se navedena mešanica vode-pare, ki nastane pri hladnem zagonu HRSG-ja, odvede v separatorsko posodo oziroma v posodo za odvodnjavanje. Navedeni posodi morata biti temu primerno dimenzioniraniTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Mariboru, Fakulteta za energetiko