Fireside Corrosion during Oxyfuel Combustion Considering Various SO2 Contents

Stein-Brzozowska, Gosia; Norling, Rikard; Viklund, Peter; Maier, J.; Scheffknecht, Günter

doi:10.1016/j.egypro.2014.07.027

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…Decrease in surface activity of oxygen ions would result in lower driving force for diffusion through the oxide and hence slowing down of oxidation. So far, there is no conclusive opinion about the effects of SO 2 on oxidation behaviour of alloys in oxyfuel environment [2,4,[25][26][27][28]. Some groups report SO 2 to be neutral [2,25] while others [4,26,27] report it to be detrimental with regard to oxidation.…”

Section: Effect Of So 2 On Scale Morphologymentioning

confidence: 93%

“…Oxidation studies [2,4,[25][26][27][28] of materials exposed to flue gases relevant to the oxyfuel process, also show ambiguous results regarding the influence of SO 2 on the oxidation behaviour. In general, Fe-Cr ferritic/martensitic steels and austenitic stainless steels experience increased oxidation rate in oxyfuel gas as compared to conventional flue gas [4,26] and increase in SO 2 concentration results in an increase in corrosion rate [27]. However, a recent study [25] has shown that the presence of SO 2 in the oxyfuel flue gas influences only the scale morphology and does not adversely affect the oxidation rate of P92 alloy.…”

Section: Introductionmentioning

confidence: 91%

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Comparative Study on High Temperature Oxidation of T92 Steel in Dry and Wet Oxyfuel Environments

et al. 2015

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Fireside oxidation of T92 steel was studied after exposure times up to 1000 h in the temperature range of 580-650°C in simulated dry (CO 2 -27 % N 2 -2 % O 2 -1 % SO 2 ) and wet (CO 2 -20 % H 2 O-7 % N 2 -2 % O 2 -1 % SO 2 ) oxyfuel environments. Water vapour addition to the oxyfuel gas substantially increased the oxidation rate. The oxide scales developed under wet environment contained more defects, resulting in higher access of oxidants to the substrate material and enhanced oxidation. In addition, the oxide scales had lower chromium enrichment in the inner layer as compared to that in the dry condition. The oxide scales consisted of hematite and magnetite in the outer layer and a mixture of (Fe, Cr)-spinel, sulphides and wustite in the inner layer. The sulphur distribution differed between the oxide scales developed in dry and wet oxyfuel environments. Sulphur was mainly concentrated in the inner layer and at the oxide/alloy interface. In contrast to the wet oxyfuel gas, very high sulphur concentration was measured in the inner oxide scale formed in the dry oxyfuel gas. Additionally, Fe-sulphide was formed at the interface of inner and outer oxide layer in the wet condition.

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Section: Effect Of So 2 On Scale Morphologymentioning

confidence: 93%

Section: Introductionmentioning

confidence: 91%

Comparative Study on High Temperature Oxidation of T92 Steel in Dry and Wet Oxyfuel Environments

et al. 2015

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“…The reported effects of oxy-combustion on fireside corrosion have been mixed for Fe9Cr ferriticmartensitic steels [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Hjörnhede et al [6] examined oxyfuel pilot plant exposures of Fe9Cr steels at Vattenfall and found no significant differences between oxy-fired and air-fired ash deposits, corrosion rates, or carburization.…”

Section: Introductionmentioning

confidence: 99%

“…Chandra et al [7] found that 9-12 Cr ferritic-martensitic steels in oxy-combustion environments (CO2, 27% N2, 2% O2, 1% SO2) were susceptible to carburization. Stein-Brzozowska et al [8,9] found fireside corrosion for Fe9Cr steels in oxy-combustion environments to increase with increasing SO2 and increasing temperature (to 650°C). Robertson et al [5] found corrosion rates for T91 to be the same, or somewhat higher, in air-combustion than in oxy-combustion (for the same SO2 content).…”

Section: Introductionmentioning

confidence: 99%

Simulated fireside corrosion of T91 in oxy-combustion systems with an emphasis on coal/biomass environments

Holcomb

Carney

Tylczak

et al. 2019

Materials at High Temperatures

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Oxy-combustion is the burning of a fuel in oxygen rather than air for the ease of capture of CO2 for reuse or sequestration. Corrosion issues associated with the change in heat exchanger tube operating environment (replacement of most of the N2 with CO2 and potentially higher SOx levels) from air-to oxycombustion, were examined. The ferritic-martensitic alloy T91 was used in accelerated fireside corrosion tests using several different gas compositions and ash deposit overcoats to simulate air-fired, oxy-fired coal, and oxy-fired co-fired coal/biomass conditions. Initial corrosion was observed after 240 h of exposure by examining cross-sections with retained ash. Metal section losses were determined after exposures of up to 1440 h at 600-700 °C. Severe corrosion was observed, and a corrosion response with respect to ash deposit chemistry was observed. Corrosion response differences with respect to gas phase chemistry were minimal. Alloy-oxide scale-ash morphologies were consistent with oxide fluxing mechanisms.

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Thin Sol–Gel Alumina Coating as Protection of a 9% Cr Steel Against Flue Gas Corrosion at 650 °C

et al. 2017

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Fireside Corrosion during Oxyfuel Combustion Considering Various SO2 Contents

Cited by 9 publications

References 8 publications

Comparative Study on High Temperature Oxidation of T92 Steel in Dry and Wet Oxyfuel Environments

Comparative Study on High Temperature Oxidation of T92 Steel in Dry and Wet Oxyfuel Environments

Simulated fireside corrosion of T91 in oxy-combustion systems with an emphasis on coal/biomass environments

Thin Sol–Gel Alumina Coating as Protection of a 9% Cr Steel Against Flue Gas Corrosion at 650 °C

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