The challenge in understanding the corrosion mechanisms under oxyfuel combustion conditions

Kranzmann, Axel; Neddemeyer, T.; Ruhl, Aki Sebastian; Huenert, D.; Bettge, Dirk; Oder, G.; Neumann, R. Saliwan

doi:10.1016/j.ijggc.2011.05.029

Cited by 45 publications

(30 citation statements)

References 24 publications

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“…The oxyfuel process is seen as one of the most promising techniques in that direction whereby it allows the capture of CO 2 from the exhaust gas for storage and enhanced gas or oil recovery [1][2][3][4]. The principle of oxyfuel process consists of combusting coal or other fossil fuel in pure O 2 rather than in air with the aim of eliminating atmospheric N 2 from the flue gas stream.…”

Section: Introductionmentioning

confidence: 99%

“…This increases the volume fraction of CO 2 in the flue gas to more than 50 % which has a beneficial effect with regard to its capture. Additionally, the oxyfuel flue gas contains much higher H 2 O and SO 2 volume fractions compared to the conventional flue gases [2][3][4]. Other major gaseous components in flue gases include carbon monoxide, nitrogen from fuel and possible leakage, up to 4 % O 2 , and nitrogen oxides [2].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the oxyfuel flue gas contains much higher H 2 O and SO 2 volume fractions compared to the conventional flue gases [2][3][4]. Other major gaseous components in flue gases include carbon monoxide, nitrogen from fuel and possible leakage, up to 4 % O 2 , and nitrogen oxides [2]. This change in flue gas environment is a matter of concern for fireside corrosion of boiler tube materials.…”

Section: Introductionmentioning

confidence: 99%

“…In general, after an initial period of protection, these steels undergo breakaway oxidation in wet gases due to failure of the protective chromia layer. This has been attributed to the loss of Cr by formation of volatile oxy-hydroxides such as CrO 2 (OH) 2 and Cr(OH) 3 [5,9,10,16] leading to breakaway oxidation and rapid growth of Fe-rich oxides. Other mechanisms proposed for enhanced oxidation in the presence of water vapour includes: high growth rate of chromia scale requiring higher Cr content in the alloy to maintain the stability of chromia scale [8,10]; incorporation of hydrogen into oxide scale and alloy modifying the diffusion processes [8,9]; preferential adsorption of water molecules on the surface [17]; dissociation processes due to H 2 /H 2 O-bridges in voids within the scale [15]; enhanced molecular diffusion of water molecules through the porous scale [14,15]; and enhanced growth stresses leading to scale cracking [17].…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Oxy-fuel combustion can be expected to differ from combustion in air by modified distribution of fireside temperatures, much reduced NOx emissions, increased levels of fireside CO2 and H2O with small amounts of O2, Ar, N2, and some impurities like SO2 and Cl [5]. Due to recycling of flue gas in oxy-fired combustion compared to air firing, there is an increased risk of corrosive species enrichment in the flue gas environment [6,7].…”

Section: Introductionmentioning

confidence: 99%

Tailoring a High Temperature Corrosion Resistant FeNiCrAl for Oxy-Combustion Application by Thermal Spray Coating and HIP

et al. 2015

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Oxy-fuel combustion combined with CCS (carbon capture and storage) aims to decrease CO2 emissions in energy production using fossil fuels. Oxygen firing changes power plant boiler conditions compared to conventional firing. Higher material temperatures and harsher and more variable environmental conditions cause new degradation processes that are inadequately understood at the moment. In this study, an Fe-Ni-Cr-Al alloy was developed based on thermodynamic simulations. The chosen composition was manufactured as powder by gas atomization. The powder was sieved into two fractions: The finer was used to produce thermal spray coatings by high velocity oxy-fuel (HVOF) and the coarser to manufacture bulk specimens by hot isostatic pressing (HIP). The high temperature corrosion properties of the manufactured FeNiCrAl coating and bulk material were tested in laboratory conditions simulating oxy-combustion. The manufacturing methods and the results of high temperature corrosion performance are presented. The corrosion performance of the coating was on average between the bulk steel references Sanicro 25 and TP347HFG. OPEN ACCESSCoatings 2015, 5 710

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Effect of oxy‐firing on corrosion rates at 600–650 °C

Pint

Thomson

2013

Materials & Corrosion

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Because of higher CO2, and possibly H2O and SO2, levels in the boiler, there are concerns about increased corrosion rates after retrofitting current coal fired boilers from air‐firing to oxy‐firing to assist in CO2 capture. The oxidation behavior of a combination of commercial and model alloys were investigated both with and without the presence of synthetic coal ash at 600 and 650 °C. At 600 °C, a CO2–H2O environment showed the most rapid oxidation rate for Fe‐based alloys with <20% Cr and varying the CO2 content or adding a 0.15% O2 buffer had little effect on the mass change. However, at 650 °C, the O2‐buffered CO2–H2O environment showed a similar rate of oxidation as 100% H2O, again requiring more than 20% Cr for a thin protective Cr‐rich oxide to form. With synthetic coal ash, increasing the CO2, H2O, and/or SO2 levels in the gas phase tended to show a lower oxide thickness after a 500 h exposure at 600 °C, compared to the base line air‐firing condition. At 650 °C, no systematic increase in the reaction rate was observed when switching from the air firing to the oxy‐firing gas. These simulations suggest that higher CO2 contents with oxy‐firing do not increase the rate of oxidation.

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The challenge in understanding the corrosion mechanisms under oxyfuel combustion conditions

Cited by 45 publications

References 24 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

Tailoring a High Temperature Corrosion Resistant FeNiCrAl for Oxy-Combustion Application by Thermal Spray Coating and HIP

Effect of oxy‐firing on corrosion rates at 600–650 °C

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