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1.
Application of gas condensing boilers in domestic heating
Marija Živić, Antun Galović, Jurij Avsec, Antun Barac, 2019, izvirni znanstveni članek

Opis: A growing number of households have had condensing boilers built in to be used for the heating of spaces and for the hot water supply. The use of condensing boilers is justified from the point of view of energy because they achieve higher thermal efficiency than traditional boilers. Condensation of water vapour occurs in the flue gases, whereby the heat released by condensation is used to heat the water in the boiler. How much water vapour will condense depends on the temperature to which the flue gases are cooled. In this paper, a thermodynamic analysis of thirteen built-in gas condensing boilers was performed; data on the flue gas composition and temperature, as well as on the excess air required for combustion were obtained for that purpose. The calculation results consisting of the amount of condensed water, the thermal efficiency of the boiler, and the volume flow rates of the air and fuel are presented in tables. The analysis identified the cases in which the water vapour condensation occurred and determined the amount of the condensed water. The cases without water vapour condensation were also identified.
Ključne besede: gas condensing boilers, thermodynamic analysis, thermal efficiency of the boiler
Objavljeno v DKUM: 22.02.2024; Ogledov: 281; Prenosov: 20
.pdf Celotno besedilo (842,88 KB)
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2.
HRSG system description and water-steam analysis at the HRSG cold start-up
Dušan Strušnik, 2021, izvirni znanstveni članek

Opis: 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.
Ključne besede: boiler, duct, flue gas, heat recovery, stack, steam generator, superheater
Objavljeno v DKUM: 13.11.2023; Ogledov: 427; Prenosov: 7
.pdf Celotno besedilo (4,58 MB)
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3.
Analiza cevovodov v NEK d.o.o.
Iztok Deržanič, 2015, magistrsko delo

Opis: Magistrsko delo se nanaša na področje načrtovanja in analiziranja cevovodnih sistemov v podjetju Nuklearna elektrarna Krško (NEK), d. o. o. Prikazan je potek načrtovanja novega sistema odmuljevanja v zgradbi bistvene oskrbne vode (ESW), ki bi nadgradil obstoječi način odstranjevanja usedlin s pomočjo potapljača. Sistem bistvene oskrbe vode ima pomembno vlogo pri zagotavljanju varnosti, saj je njegov primarni namen odvajanje toplote iz sistema hlajenja komponent. Z vgradnjo novega sistema bi tako varnost delovanja elektrarne še povišali. Analiza cevovoda je izvedena s pomočjo računalniškega programa Bentley AutoPIPE, ki je certificirano orodje za izdelavo analiz v jedrski industriji. Za analizo je izdelan model, ki temelji na zahtevah standardov ASME B31.1 in ASME BPVC, sekcija III, ki se v NEK uporabljata za načrtovanje novih cevovodnih sistemov. Prikazani in primerjani so rezultati analiz po posameznem standardu. V splošnem pa predstavljeno delo zajema opis podjetja in nekaj splošnih informacij o njegovem delovanju, predstavljeni so standardi in pripadajoča zakonodaja, opisana in izvedena pa je tudi zgoraj omenjena analiza.
Ključne besede: Nuklearna elektrarna Krško, preračun cevovodov, ASME B31.1, ASME Boiler and Pressure Vessel Code
Objavljeno v DKUM: 28.10.2015; Ogledov: 1774; Prenosov: 258
.pdf Celotno besedilo (3,12 MB)

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