High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors
Heat-exchanger tubes in fluidized bed combustors (FBCs) often suffer material loss due to combined corrosion and erosion. Most severe damage is believed to be caused by the impact of dense packets of bed material on the lower parts of the tubes. In order to understand this phenomenon, a unique labor...
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2004-03-01
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Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000100011 |
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doaj-921600be7e8d4f55901cc83b849fbdd62020-11-25T00:24:04ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392004-03-0171718010.1590/S1516-14392004000100011High temperature degradation by erosion-corrosion in bubbling fluidized bed combustorsPeggy HouStuart MacAdamYan NiuJohn StringerHeat-exchanger tubes in fluidized bed combustors (FBCs) often suffer material loss due to combined corrosion and erosion. Most severe damage is believed to be caused by the impact of dense packets of bed material on the lower parts of the tubes. In order to understand this phenomenon, a unique laboratory test rig at Berkeley was designed to simulate the particle hammering interactions between in-bed particles and tubes in bubbling fluidized bed combustors. In this design, a rod shaped specimen is actuated a short distance within a partially fluidized bed. The downward specimen motion is controlled to produce similar frequencies, velocities and impact forces as those experienced by the impacting particle aggregates in practical systems. Room temperature studies have shown that the degradation mechanism is a three-body abrasion process. This paper describes the characteristics of this test rig, reviews results at elevated temperatures and compares them to field experience. At higher temperatures, deposits of the bed material on tube surfaces can act as a protective layer. The deposition depended strongly on the type of bed material, the degree of tube surface oxidation and the tube and bed temperatures. With HCl present in the bed, wastage was increased due to enhanced oxidation and reduced oxide scale adherence.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000100011Fluidized bed combustorsoxidationerosionHClcarbon steel |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Peggy Hou Stuart MacAdam Yan Niu John Stringer |
spellingShingle |
Peggy Hou Stuart MacAdam Yan Niu John Stringer High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors Materials Research Fluidized bed combustors oxidation erosion HCl carbon steel |
author_facet |
Peggy Hou Stuart MacAdam Yan Niu John Stringer |
author_sort |
Peggy Hou |
title |
High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors |
title_short |
High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors |
title_full |
High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors |
title_fullStr |
High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors |
title_full_unstemmed |
High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors |
title_sort |
high temperature degradation by erosion-corrosion in bubbling fluidized bed combustors |
publisher |
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
series |
Materials Research |
issn |
1516-1439 |
publishDate |
2004-03-01 |
description |
Heat-exchanger tubes in fluidized bed combustors (FBCs) often suffer material loss due to combined corrosion and erosion. Most severe damage is believed to be caused by the impact of dense packets of bed material on the lower parts of the tubes. In order to understand this phenomenon, a unique laboratory test rig at Berkeley was designed to simulate the particle hammering interactions between in-bed particles and tubes in bubbling fluidized bed combustors. In this design, a rod shaped specimen is actuated a short distance within a partially fluidized bed. The downward specimen motion is controlled to produce similar frequencies, velocities and impact forces as those experienced by the impacting particle aggregates in practical systems. Room temperature studies have shown that the degradation mechanism is a three-body abrasion process. This paper describes the characteristics of this test rig, reviews results at elevated temperatures and compares them to field experience. At higher temperatures, deposits of the bed material on tube surfaces can act as a protective layer. The deposition depended strongly on the type of bed material, the degree of tube surface oxidation and the tube and bed temperatures. With HCl present in the bed, wastage was increased due to enhanced oxidation and reduced oxide scale adherence. |
topic |
Fluidized bed combustors oxidation erosion HCl carbon steel |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000100011 |
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