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Alloy Selection for a Cofired Circulating Fluidized Bed Boiler Vortex Finder Application at 880 °c in a Complex Mixed Mode Corrosion Environment
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Yt- och korrosionsvetenskap.
2017 (engelsk)Inngår i: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 31, nr 11, s. 12857-12866Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

X-ray diffraction and scanning electron microscopy (SEM) were used on a corroded industrial-scale circulating fluidized bed (CFB) boiler vortex finder (VF) 253MA alloy plate material to identify the dominating corrosion products and to enable a qualified selection of candidate alloys for the long-term, full-scale exposure study. Alloys 253MA, 310S, 800H/HT, Alloy DS, and Alloy 600 were chosen, and the alloy plates were exposed to the CFB boiler combustion atmosphere having an average temperature of approximately 880 °C, consisting of a moist globally oxidizing gas, burning hydrocarbons, CO2, CO, SO2, HCl, NH3, N2, alkali species, and erosive particles. The exposure times used in this study were 1750, 8000, 12000, and 16000 operating hours. After exposure, the alloy samples were cut, and cross-sections were dry-polished and analyzed with an SEM-backscatter electron detector (BSD) setup to quantify material loss and penetration depth of the corrosion attack. This work suggests two novel concepts: heavily affected depth (HAD) enabling quantitative evaluation of heavily degraded alloys and remaining serviceable metal thickness (RSMT) enabling the use of long-term corrosion data from one alloy to make rough service life estimations of other alloys exposed for significantly shorter periods. The findings of this work show that there is no simple correlation between the heavily affected depth of the alloy and the nickel, chromium, or iron content. Instead, there seem to be two successful alloy composition principles that work well for this application. Furthermore, the work shows that major improvements can be made in terms of both technical life-span and the cost-effectiveness of the VF application if the most appropriate alloy is selected. In this study, a replacement of the frequently used Alloy 253MA with Alloy 310S doubled the lifespan of full-scale VFs, reducing the average VF maintenance cost to half.

sted, utgiver, år, opplag, sider
American Chemical Society (ACS), 2017. Vol. 31, nr 11, s. 12857-12866
Emneord [en]
Boilers, Combustion, Corrosion, Cost effectiveness, Fluidized bed combustion, Fluidized bed process, Pulverized fuel fired boilers, Scanning electron microscopy, Vortex flow, X ray diffraction, Alloy compositions, Circulating fluidized bed boiler, Corrosion environments, Corrosion products, Electron detectors, Long-term corrosion, Quantitative evaluation, Service life estimation, Fluidized beds
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Identifikatorer
URN: urn:nbn:se:kth:diva-227144DOI: 10.1021/acs.energyfuels.7b00984ISI: 000416204800136Scopus ID: 2-s2.0-85034573409OAI: oai:DiVA.org:kth-227144DiVA, id: diva2:1202983
Forskningsfinansiär
Swedish Research Council
Merknad

QC 20180502

Tilgjengelig fra: 2018-05-02 Laget: 2018-05-02 Sist oppdatert: 2019-02-07bibliografisk kontrollert

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