Investigation of alkali induced corrosion of SiC filter candles at high temperature, in gasification environment

Bläsing, Marc; Schaafhausen, Sarah; Müller, Michael

doi:10.1016/j.jeurceramsoc.2013.10.035

Cited by 18 publications

(6 citation statements)

References 20 publications

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“…14) with slight alkali and alkaline earth metal oxide inclusions on the SSiC surface was observed for both conditions, without and with ash. The formation can be explained by water vapour caused oxidation 25,26 and is typical for this kind of material.…”

Section: Resultsmentioning

confidence: 93%

“…Furthermore, these corrosion mechanisms are promoted by the presence of alkali compounds. 25,26,34 Owing to the preferred absorption of alkali metals by the aluminosilicate joint material and the resulting higher diffusion rate, the oxidation of the SiC base material is most distinct at the interface between joint and base material, especially in case of high alkali content, e.g. joints 1 and 3.…”

Section: Discussionmentioning

confidence: 99%

“…It is well known that water vapour leads to distinct corrosion effects on silica based materials. 25,26 In this case, the hydration of aluminosilicates 29,30 or especially the oxidation of the silicon carbide [31][32][33] can cause the formation of volatile reaction components that expand the joint material. Furthermore, these corrosion mechanisms are promoted by the presence of alkali compounds.…”

Section: Gas Inclusionsmentioning

confidence: 99%

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Corrosion of laser joined silicon carbide in gasification environment

Schaafhausen

Börner

Chand

et al. 2015

Advances in Applied Ceramics

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The production of synthesis gas from renewable fuels is an emerging technology. The aggressive process environment in fuel production systems poses a major challenge, potentially causing corrosion within currently used metallic heat exchangers. To improve the reliability and stability of silicon carbide heat pipes, which belong to an innovative heat exchanger design, the corrosion of involved materials due to contact with steam, ash and alkaline (earth) metals needs to be investigated. Exposures of laser joined SSiC connections with wood ash caused the formation of gas inclusions and an infiltration of the joint with alkaline (earth) metals that lead to crack formations, as revealed by energy dispersive X-ray spectroscopy analysis. It was shown that the use of silicon carbide heat pipes joined with solder materials of both the Mg-Al-Si and the Y-Al-Si systems is possible. A further result was that the gasification temperature has to be limited to ,8508C.

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Section: Resultsmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Gas Inclusionsmentioning

confidence: 99%

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Corrosion of laser joined silicon carbide in gasification environment

Schaafhausen

Börner

Chand

et al. 2015

Advances in Applied Ceramics

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“…Electrochemical corrosion was carried out by potentiodynamic method, and the voltage varied linearly with time during the experiment. In this experiment, the samples all appeared four stages: activation, passivation transition, passivation and over-passivation [12]. In the activation stage, a large number of bubbles appear on the surface of the sample to be tested and the auxiliary electrode.…”

Section: Resultsmentioning

confidence: 99%

Investigation on alkali corrosion resistance of 310s + WC coatings prepared by PTA

Zhang

Liu

Zhou

et al. 2020

Surface Engineering

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In order to prolong the service life of the water-cooled wall used in boilers of paper mills, explosive welded composite steel pipes are mostly used due to their excellent alkali corrosion resistance, but its technical requirements and costs are relatively high. In this paper, FSAN38 powder modelled on Sanicro38 composition and 310s stainless steel + WC powders is utilized to prepare a composite metal layer on 1020G surface by plasma cladding technology. Electrochemical corrosion and molten alkali corrosion experiments were carried out, then the microstructure and composition of the cladding layer were observed. Compared with explosion welded composite steel plate Sanicro38, it is found that the 310s +10%WC surfacing layer has the best alkali corrosion resistance, its electrochemical corrosion rate is 0.038184 mm a −1 , and the corrosion rate in molten alkali salt is 1.01 × 10 4 g (m 2 h) −1 , which is 61.9% of Sanicro38.

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“…Frequent back-pulsing could increase particle penetration and filter erosion, and reduce filter life expectancy . When the system runs at a high temperature, some other effects from accumulated filter-cake particles, such as dust sintering, soot formation and alkali corrosion , could result in a high and permanent residual pressure drop. New alternatives to handling the pressure drop created by filter-cake particles are still required to achieve a long-term durability.…”

Section: Introductionmentioning

confidence: 99%

Partial Oxidation of Filter Cake Particles from Biomass Gasification Process in the Simulated Product Gas Environment

et al. 2018

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Filtration failure occurs when filter media are blocked by accumulated solid particles. Suitable operating conditions were investigated for cake cleaning by partial oxidation of filter-cake particles (FCPs) during biomass gasification. The mechanism of the FCP partial oxidation was investigated in a ceramic filter and by using thermogravimetric analysis through a temperature-programmed route in a 2 vol % O2–N2 environment. Partial oxidation of the FCPs in the simulated product gas environment was examined at 300–600 °C in a ceramic filter that was set and heated in a laboratory-scale fixed reactor. Four reaction stages, namely, drying, preoxidation, complex oxidation, and nonoxidation, occurred in the FCP partial oxidation when the temperature increased from 30 to 800 °C in a 2 vol % O2–N2 environment. Partial oxidation was more effective for FCP mass loss from 275 to 725 °C. Experimental results obtained in a ceramic filter indicated that the best operating temperature and FCP loading occurred at 400 °C and 1.59 g/cm2, respectively. The FCPs were characterized before and after partial oxidation by Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunaeur–Emmett–Teller analysis. Fourier-transform infrared spectroscopy analysis revealed that partial oxidation of the FCPs can result in a significant decrease in C–H n (alkyl and aromatic) groups and an increase in CO (carboxylic acids) groups. The scanning electron microscopy and Brunaeur–Emmett–Teller analyses suggest that, during partial oxidation, the FCPs underwent pore or pit formation, expansion, amalgamation, and destruction.

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Investigation of alkali induced corrosion of SiC filter candles at high temperature, in gasification environment

Cited by 18 publications

References 20 publications

Corrosion of laser joined silicon carbide in gasification environment

Corrosion of laser joined silicon carbide in gasification environment

Investigation on alkali corrosion resistance of 310s + WC coatings prepared by PTA

Partial Oxidation of Filter Cake Particles from Biomass Gasification Process in the Simulated Product Gas Environment

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