Failure case studies of SA213-T22 steel tubes of boiler through computer simulations

Purbolaksono, J.; Ahmad, J.; Khinani, A.; Ali, Ammar A.; Rashid, Abd

doi:10.1016/j.jlp.2009.06.005

Cited by 29 publications

(26 citation statements)

References 6 publications

(7 reference statements)

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“…In this work, the sin 2 w method employing X-ray diffractometer equipped with Cr target was utilized. The diffraction angle 2h of the (044) lattice plane of magnetite was measured for different tilt angles w. The plots showing sin 2 w against 2h were desired since their slopes M were needed to calculate the residual stresses according to r r ¼KÁM, where K is determined by 29 K ¼ À0:5E ma;ð044Þ =ð1 þ ma;ð044Þ Þ Á coth 0 Á p=180 ; (4) in which E ma,(044) and ma,(044) are the elastic modulus and Poisson's ratio corresponding to the (044) plane of magnetite; theoretical diffraction angle 2h 0 of (044) plane is equal FIG. 6.…”

Section: A Critical Cracking Strainmentioning

confidence: 99%

“…It is known that even a small increase of the tube temperature will reduce the creep rupture life considerably. [3][4][5] Further, during the boiler operating condition's variation periods, the mismatch between the thermal expansion coefficients of metal substrate and oxide scale will cause large stresses in oxide scales, resulting in cracking, delamination, and spalling of oxide scales. 1 Various problems will arise with the failure of steamside oxide scales.…”

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confidence: 99%

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Acoustic emission analysis on tensile failure of steam-side oxide scales formed on T22 alloy superheater tubes

Huang

Zhou

Wang

et al. 2014

Journal of Applied Physics

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Failure of steam-side oxide scales on boiler tubes can seriously influence the safety of coal-fired power plants. Uniaxial tensile tests employing acoustic emission (AE) monitoring were performed, in this work, to investigate the failure behavior of steam-side oxide scales on T22 alloy boiler superheater tubes. The characteristic frequency spectra of the captured AE signals were obtained by performing fast Fourier transform. Three distinct peak frequency bands, 100-170, 175-250, and 280-390 kHz, encountered in different testing stages were identified in the frequency spectra, which were confirmed to, respectively, correspond to substrate plastic deformation, oxide vertical cracking, and oxide spalling with the aid of scanning electronic microscopy observations, and can thus be used for distinguishing different oxide failure mechanisms. Finally, the critical cracking strain of the oxide scale and the interfacial shear strength of the oxide/substrate interface were estimated, which are the critical parameters urgently desired for modeling the failure behavior of steam-side oxide scales on boiler tubes of coal-fired power plants.

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Section: A Critical Cracking Strainmentioning

confidence: 99%

mentioning

confidence: 99%

Acoustic emission analysis on tensile failure of steam-side oxide scales formed on T22 alloy superheater tubes

Huang

Zhou

Wang

et al. 2014

Journal of Applied Physics

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“…It is found that the initially formed scale can act as a diffusion barrier to hinder further oxidation. Since the steam oxidation is unavoidable, it is thus expected that the mechanical integrity of the scale can be maintained . However, during the boiler operating condition's variation periods, large thermal stresses will be imposed on the steam‐side oxide scales due to the mismatch between coefficients of thermal expansion of the oxide scale and substrate.…”

Section: Introductionmentioning

confidence: 99%

Failure evaluation of steam‐side oxide scales in superheater tubes during unsteady thermal processes: A probabilistic method

Huang

Zhou

et al. 2014

Materials & Corrosion

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Issues resulting from failure of steam‐side oxide scales in boiler superheater or reheater tubes seriously influence the safety of coal‐fired power plants. In this work, an analysis model for the failure of steam‐side oxide scales during unsteady thermal processes is established. This model employs the advanced oxide scale failure diagram as the failure criterion, and also takes into account the influence of temperature on the coefficients of thermal expansion of both metal substrate and oxide scale. Since the stochastic nature of related geometrical, mechanical, and thermophysical parameters may hinder the usual deterministic investigation from obtaining a reliable evaluation, probabilistic failure evaluation which is not based on bivalent logic is thus performed. Focusing on the unsteady thermal processes induced by the variation of steam temperature, effects of oxide scale thickness as well as different steam temperature variation processes on the failure probability of steam‐side oxide scales are analyzed. It is found that the failure probability of thicker steam‐side oxide scales is higher, while through reasonably selecting steam temperature variation mode and appropriately lengthening variation duration, lower failure probability can be achieved. Feasible measures are presented with the aspiration to solve the steam‐side oxide scale failure issues.

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“…Rahman et al (2010) worked on root cause failure analysis of a division wall superheater tube (super alloy Inconel ® 800) of a coal-fired power station in Kapar Power Station, Malaysia. Purbolaksono et al (2010) had undergone failure case studies of SA213-T22 steel tubes of the reheater and superheater of boiler using computer simulations.…”

Section: Introductionmentioning

confidence: 99%

RAM investigation of coal-fired thermal power plants: A case study

Bose¹,

Chattopadhyay²,

Bose³

et al. 2012

ijiec

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Failure case studies of SA213-T22 steel tubes of boiler through computer simulations

Cited by 29 publications

References 6 publications

Acoustic emission analysis on tensile failure of steam-side oxide scales formed on T22 alloy superheater tubes

Acoustic emission analysis on tensile failure of steam-side oxide scales formed on T22 alloy superheater tubes

Failure evaluation of steam‐side oxide scales in superheater tubes during unsteady thermal processes: A probabilistic method

RAM investigation of coal-fired thermal power plants: A case study

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