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Durability testing of ceramic candle filters in pressurized-fluidized bed combustion environments

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dc.contributor.authorValentino, Karen Roseen
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T21:34:22Zen
dc.date.adate2009-04-25en
dc.date.available2014-03-14T21:34:22Zen
dc.date.issued1993en
dc.date.rdate2009-04-25en
dc.date.sdate2009-04-25en
dc.description.abstractCeramic candle filters were subjected to 500 hour high temperature/ high pressure (HTHP) exposure tests to examine their extended durability in simulated coal pressurized-fluidized bed combustion (PFBC) environments. The candle filter materials analyzed included two SiC filters, one with clay binder and one with a minimal amount of clay binder, a cordierite filter, a mullite candle filter and an aluminosilicate refractory concrete filter. Exposure testing conditions included a range of temperature from 700-850°C and a pressure ranging from 1.7-1.8 MPa. The HTHP tests included exposing the ceramic filter materials to steam and steam-alkali environments. The presence of alkali significantly accelerated the deterioration of the filters. The results of the analysis show that significant crushing strength losses were exhibited by the SiC filters after exposure to HTHP alkali-steam conditions at temperatures as low as 700°C. The expansive and destructive cristobalite phase developed in the SiC filters after most of the treatments. The cordierite candle filter showed a decrease in crushing strength associated with grain growth after each high temperature exposure but few other signs of deterioration were detected. The mullite candle filter and the refractory concrete candle filter showed the least amount of change in crushing strength and overall the most candle stability.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 45 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-04252009-040418en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04252009-040418/en
dc.identifier.urihttp://hdl.handle.net/10919/42200en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1993.V354.pdfen
dc.relation.isformatofOCLC# 28012147en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1993.V354en
dc.subject.lcshFilters and filtrationen
dc.subject.lcshFluidized-bed combustionen
dc.titleDurability testing of ceramic candle filters in pressurized-fluidized bed combustion environmentsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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