ROOT-CAUSE ANALYSIS OF SUPERHEATER-TUBE FAILURE

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F17%3APU123845" target="_blank" >RIV/00216305:26210/17:PU123845 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.17222/mit.2016.204" target="_blank" >http://dx.doi.org/10.17222/mit.2016.204</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.17222/mit.2016.204" target="_blank" >10.17222/mit.2016.204</a>

Result language

angličtina

Original language name

ROOT-CAUSE ANALYSIS OF SUPERHEATER-TUBE FAILURE

Original language description

Superheater-tube failure is listed among the major causes of a fossil-fuel-fired boiler outage. Therefore, it is necessary not only to identify and repair it in the case of failure but also to eliminate the root cause of this problem. As there may be multiple reasons of failure in exposed equipment such as a superheater, a thorough investigation of more than one probable cause is usually required. This article focuses on a failure analysis of a boiler located in a chemical plant. After a leak was discovered, several cracks on the superheater tubes were identified as its main cause. It was necessary to assess the extent of the damage, detect the root cause and propose corrective actions. Two problematic locations with cracks were identified during the visual inspection: the first was on the superheater-tube bends and the other was the weld joint between the superheater and the transition pipe. As the first step, the material-microstructure and composition analyses of the tubes in these critical locations were carried out. Even though small weaknesses were found in the microstructure, the main cause of the tube failure was not identified. As the next probable cause, thermal-dilatation stresses were investigated using the finite-element analysis (angl. FEA). The support system, consisting of fixed and spring supports, as well as the compensator were included in the analysis that confirmed the thermal-dilatation stresses as the major cause of the failure. Based on the results, a new technical solution for the supports was suggested and verified with the FEA.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20704 - Energy and fuels

Project

<a href="/en/project/TE02000236" target="_blank" >TE02000236: Waste-to-Energy (WtE) Competence Centre</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

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

Name of the periodical

Materiali in tehnologije

ISSN

1580-2949

e-ISSN

1580-3414

Volume of the periodical

3

Issue of the periodical within the volume

51

Country of publishing house

SI - SLOVENIA

Number of pages

5

Pages from-to

503-507

UT code for WoS article

000404817900021

EID of the result in the Scopus database

2-s2.0-85020749564