Influence of Steam-Side Oxid Scales on Creep Life of Boiler Superheater Tube

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F18%3APU127722" target="_blank" >RIV/00216305:26210/18:PU127722 - isvavai.cz</a>

Výsledek na webu

<a href="http://mit.imt.si/Revija/izvodi/mit181/nad.pdf" target="_blank" >http://mit.imt.si/Revija/izvodi/mit181/nad.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.17222/mit.2017.106" target="_blank" >10.17222/mit.2017.106</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Steam-Side Oxid Scales on Creep Life of Boiler Superheater Tube

Popis výsledku v původním jazyce

Creep life is a limiting factor in case of boiler tubes operating above creep temperature, and, for a given material, it generally is determined by the actual operating temperature and stress. Standard approaches to calculation of tube creep life take into account mainly the stress caused by pressure loading and mean temperature in the tube wall. However, estimation of the temperature and stress may be difficult in water tube boilers, because oxide scales tend to form on inner surfaces of the tubes exposed to steam and indirectly affect the resulting creep life. Because scales increase thermal resistance of a tube wall and, consequently, also wall temperature, creep life is reduced. Moreover, presence of oxide scales leads to higher hydraulic resistance of the tube, which can cause further increase in temperature in some tubes of the bundle if the oxide scale growth rate is not uniform. Additionally, elements increasing creep strength may leach out of the surface should the scales be porous, thus inducing even more pronounced decrease in creep life. This paper investigates effects of oxide scales on creep life of boiler tubes in cross flow. Thermal and stress conditions in tubes are thoroughly investigated using analytical as well as numerical approaches.

Název v anglickém jazyce

Influence of Steam-Side Oxid Scales on Creep Life of Boiler Superheater Tube

Popis výsledku anglicky

Creep life is a limiting factor in case of boiler tubes operating above creep temperature, and, for a given material, it generally is determined by the actual operating temperature and stress. Standard approaches to calculation of tube creep life take into account mainly the stress caused by pressure loading and mean temperature in the tube wall. However, estimation of the temperature and stress may be difficult in water tube boilers, because oxide scales tend to form on inner surfaces of the tubes exposed to steam and indirectly affect the resulting creep life. Because scales increase thermal resistance of a tube wall and, consequently, also wall temperature, creep life is reduced. Moreover, presence of oxide scales leads to higher hydraulic resistance of the tube, which can cause further increase in temperature in some tubes of the bundle if the oxide scale growth rate is not uniform. Additionally, elements increasing creep strength may leach out of the surface should the scales be porous, thus inducing even more pronounced decrease in creep life. This paper investigates effects of oxide scales on creep life of boiler tubes in cross flow. Thermal and stress conditions in tubes are thoroughly investigated using analytical as well as numerical approaches.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/LO1202" target="_blank" >LO1202: NETME CENTRE PLUS</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materiali in tehnologije

ISSN

1580-2949

e-ISSN

1580-3414

Svazek periodika

52

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

SI - Slovinská republika

Počet stran výsledku

4

Strana od-do

43-46

Kód UT WoS článku

000426282800010

EID výsledku v databázi Scopus

2-s2.0-85041559374