20.500.12556/DKUM-86325 HRSG system description and water-steam analysis at the HRSG cold start-up Opis sistema HRSG in analiza vode-pare 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 dimensioned. Osnovni 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 dimenzionirani. boiler duct flue gas heat recovery stack steam generator superheater grelnik vode odvodnik dimni plin rekuperacija toplote dimnik generator pare pregrevalnik true false true Fakulteta za energetiko Univerze v Mariboru Angleški jezik Slovenski jezik Znanstveno delo 2023-11-13 10:34:01 2023-11-13 13:51:48 2023-12-01 13:27:59 0000-00-00 00:00:00 2021 0 0 str. 21-39 št. 4 letn. 14 dec. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2021-12-01 697 99777027 1855-5748 HRSG_system_description_Strusnik_2021.pdf HRSG_system_description_Strusnik_2021.pdf 1 E6F89F3E6BAA3B49F5C383E389935D31 b5f43dea645ce356b410c10f12a46b0caec818a37b0f184c08a6817ca917454a 33caf879-8208-11ee-b12e-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=174087 https://www.fe.um.si/e-jet/44-2021-1/3319-december-2021.html 0 c892d6f0-8207-11ee-b12e-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=174086 Fakulteta za energetiko Journal of energy technology 0 0 0