Interkristalline Spannungsrißkorrosion an Hochtemperatur‐Winderhitzern. Werkstoffkundliche, fertigungs‐ und verfahrenstechnische Maßnahmen zur Minderung und Vermeidung der Schäden

Kalfa, H.; Bühler, Hans‐Eugen

doi:10.1002/cite.330560107

Cited by 3 publications

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“…Figure shows a comparison of calculated NO emissions (in ppm, wet gas, no oxygen reference content) with explicitly chosen real plant measured data and data from a literature source . CFD results show a good agreement with measured data.…”

Section: Simulation Resultsmentioning

confidence: 78%

Thermochemical Wear of Refractory Linings Associated With Gas Firing in Metallurgical Plants

Rieger

Drózd‐Ryś

Weiß

et al. 2013

steel research int.

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The present paper deals with the corrosive interaction between the atmosphere and the refractory lining as well as in one case the steel shell for two industrial facilities. In one of the following cases a magnesia carbon lining is partly decarburized by the atmosphere during preheating of a steel ladle. In the other case, the flue gas from blast furnace gas heating of a hot blast stove causes a nitric attack on the cold side of the refractory lining at the steel shell. Investigation of these mechanisms rely on computational fluid dynamics (CFD) simulations which quantify the flow and temperature field as well as the species transport during heat release from the gas combustion in both plants. Furthermore, the heat exchange between hot gas and refractory is estimated and thereby associated chemical reactions with/within the refractory material. In both CFD case studies a non‐premixed approach was applied to model the combustion process and to characterize the flue gas composition. The follow‐up reactions with refractory lining and the steel casing are discussed specifically for each case. The calculated oxygen content in flue gas during ladle preheating is estimated to 15%vol. The maximum heat transfer between hot gas and refractory takes place in the bottom region of the ladle due to convection. The radiative heat exchange plays the most important role in the zone of magnesia‐carbon lining. Within the investigation of carbon burnout kinetics limiting factors like diffusion and mass transfer coefficient of oxygen were defined and (partially) determined. The NO formation during the blast stove heating period strongly depends on the dome temperature which is an important blast process control value. Calculated NO emission loads showed promising agreement with real plant data and literature trends.

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Section: Simulation Resultsmentioning

confidence: 78%

Thermochemical Wear of Refractory Linings Associated With Gas Firing in Metallurgical Plants

Rieger

Drózd‐Ryś

Weiß

et al. 2013

steel research int.

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CERT (Constant Extension Rate Testing) als Spannungsrißkorrosionsprüfmethode für Schweißverbindungen. I. Mechanisch‐chemische Untersuchungsergebnisse

Fellmann

Kalfa

Schare

et al. 1989

Materials & Corrosion

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zum 60. Geburtstag gewidmet Das Korrosionssystem BaustahYNitratlosung wird rnit Hilfe von CERT unter besonderer Beriicksichtigung des Einflusses von SchweiBverbindungen auf SpannungsriBkorrosionsanfalligkeit untersucht. Die Experimente werden an Proben mit RealschweiBungen und Proben rnit sirnulierten SchweiRgefiigezustanden (Grundwerkstoff, Feinkornzone, Grobkornzone) durchgefiihrt. Die anhand der relativen Bruchenergie dargestellten Ergebnisse zeigen zwar einen signifikanten EinfluB der WarmeeinfluBzone bei den SchweiRsimulationsproben, der jedoch an den Proben mit RealschweiBungen nicht mehr relevant ist. ErwartungsgemaB nimmt die Spannungsriflkorrosionsbestandigkeit in der Reihe der Werkstoffe 15 Mo 3 -StE 355 -HI1 ab. Bei allen Versuchen zeigt sich, daB die SpannungsriBkorrosionsbestandigkeit mit hoherem Warmeeinbringen zunimmt. Teil I1 der Arbeit enthalt die metallographischen Untersuchungsergebnisse und die Diskussion der Eignung von CERT zur Priifung von SchweiBverbindungen.Investigations by means of CERT on the corrosion system structural steelhitrate solution have been performed with special consideration of the influence of weld joints on stress corrosion cracking (SCC) susceptibility. Specimen with real weld joints and specimen with simulated weld joint structures (base material, course grain region, fine grain region) have been used. Results expressed as relative fracture energy show a significant influence of the heat affected zone of the simulated weld joints but not at the real weld joints. As expected, the SCC resistance decreases in the sequence of the steels 15 Mo 3 -StE 355 -H 11. All experiments exhibit increasing SCC resistance with increasing heat input. Part I1 of this work contains metallographic results and discussion of the applicability of CERT for weld joints.

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Modelling and control of pollutant formation in blast stoves

Rieger

Weiß

Rummer

2015

Journal of Cleaner Production

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Interkristalline Spannungsrißkorrosion an Hochtemperatur‐Winderhitzern. Werkstoffkundliche, fertigungs‐ und verfahrenstechnische Maßnahmen zur Minderung und Vermeidung der Schäden

Cited by 3 publications

References 0 publications

Thermochemical Wear of Refractory Linings Associated With Gas Firing in Metallurgical Plants

Thermochemical Wear of Refractory Linings Associated With Gas Firing in Metallurgical Plants

CERT (Constant Extension Rate Testing) als Spannungsrißkorrosionsprüfmethode für Schweißverbindungen. I. Mechanisch‐chemische Untersuchungsergebnisse

Modelling and control of pollutant formation in blast stoves

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