Effects of fuel composition and temperature on fireside corrosion resistance of materials for advanced ultrasupercritical coal fired power plants

Hack, Horst; Stanko, G.

doi:10.1179/174892408x383085

Cited by 16 publications

(7 citation statements)

References 2 publications

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“…These results are consistent with high temperature, air-fired corrosion experience, especially where the presence of low melting temperature compounds is possible. Previous corrosion testing programs (3)(4)(5) , specifically with regard to coal ash corrosion, showed that high temperature corrosion resistance generally increases with increasing chromium content up to about 22 -25%. In the present study, the corrosion resistance of materials tested under air-fired conditions typically increased with increasing chromium content up to about 22%, while only the low chromium (<2.5%) T22 material tested under oxy-firing conditions showed any significant evidence of corrosion for all deposit/temperature combinations.…”

Section: Effect Of Alloy Composition On Total Metal Wastagementioning

confidence: 99%

Oxy-Combustion Boiler Material Development

Gagliano¹,

Seltzer²,

Agarwal³

et al. 2012

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Section: Effect Of Alloy Composition On Total Metal Wastagementioning

confidence: 99%

Oxy-Combustion Boiler Material Development

Gagliano¹,

Seltzer²,

Agarwal³

et al. 2012

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“…Another status report on this research program was published by Hack and Stanko in 2005 [94]. They concluded that commercial alloys would have had adequate corrosion resistance for ultra-supercritical plants burning Western coals.…”

Section: Us Research To Develop Materials For Ultra-supercritical Coamentioning

confidence: 99%

Superheater Corrosion In Biomass Boilers: Today's Science and Technology

Sharp¹

2011

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“…The amount of chromium is usually dictated by the targeted exposure environment. For example, when erosion-corrosion is envisaged, the chromium level is greater than 25 wt% [5]. Because of deterioration in erosion-corrosion properties of molybdenumcontaining alloys [5], molybdenum is being substituted by tungsten which acts mainly as a strengthener to the matrix.…”

Section: Introductionmentioning

confidence: 99%

“…For example, when erosion-corrosion is envisaged, the chromium level is greater than 25 wt% [5]. Because of deterioration in erosion-corrosion properties of molybdenumcontaining alloys [5], molybdenum is being substituted by tungsten which acts mainly as a strengthener to the matrix. Alloying with tungsten also leads to g carbide formation [6].…”

Section: Introductionmentioning

confidence: 99%

Laser Clad and HVOF-Sprayed Stellite 6 Coating in Chlorine-Rich Environment with KCl at 700 °C

et al. 2017

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Laser clads and HVOF coatings from a stellite 6 alloy (Co-Cr-W-C alloy) on 304 stainless steel substrates were exposed both bare and with KCl deposits in 500 ppm HCl with 5% O 2 for 250 h at 700°C. SEM/EDX and PXRD analyses with Rietveld refinement were used for assessment of the attack and for analysis of the scales. The bare samples suffered from scale spallation and the scale was mostly composed of Cr 2 O 3 , CoCr 2 O 4 and CoO, although due to dilution haematite (Fe 2 O 3 ) was detected in the scale formed on the laser clad sample. A small amount of hydrated HCl was detected in bare samples. While the corrosion of the bare surfaces was limited to comparatively shallow depths and manifested by g and M 7 C 3 carbide formation, the presence of KCl on the surface led to severe Cr depletion from the HVOF coating (to 1 wt%). Both inward and outward diffusion of elements occurred in the HVOF coating resulting in Kirdendall voids at the coatingsteel interface. The laser clad sample performed significantly better in conditions of the KCl-deposit-induced corrosion. In addition to the oxides, CoCl 2 was detected in the HVOF sample and K 3 CrO 4 was detected in the laser clad sample. Thermodynamic calculations and kinetic simulations were carried out to interpret the oxidation and diffusion behaviours of coatings.

show abstract

Effects of fuel composition and temperature on fireside corrosion resistance of materials for advanced ultrasupercritical coal fired power plants

Cited by 16 publications

References 2 publications

Oxy-Combustion Boiler Material Development

Oxy-Combustion Boiler Material Development

Superheater Corrosion In Biomass Boilers: Today's Science and Technology

Laser Clad and HVOF-Sprayed Stellite 6 Coating in Chlorine-Rich Environment with KCl at 700 °C

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