Failure analysis of the wall tubes of a water-tube boiler

Duarte, Camilo A.; Espejo, Édgar; Martínez, Julio Rojas

doi:10.1016/j.engfailanal.2017.05.032

Cited by 74 publications

(27 citation statements)

References 9 publications

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“…Badur and Bryk [20] considered the use of low-pressure steam obtained from the boiler unit in a lowpower turbine. At the same time, Duarte et al [21] showed the possibility of applying reliability criteria to power equipment that contribute to trouble-free operation, including boiler units that produce low-pressure steam.…”

Section: Review Of Work On the Research Topicmentioning

confidence: 99%

Experimental Study of a Coil Type Steam Boiler Operated on an Oil Field in the Subarctic Continental Climate

2021

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Transportable boiler plants are widespread in the northern regions of the Russian Federation and have a large and stable demand in various spheres of life. The equipment used and the schemes of existing boiler plants are outdated—they require replacement and modernization. Our proposed new installation includes a coil type steam boiler and ancillary equipment designed with the identified deficiencies in mind. The steam boiler coils are coaxial cylinders. The scope of the modernized transportable boiler plant is an oil field in the subarctic continental climate. The work is aimed at completing an experimental and theoretical study of the operation of a coil type steam boilers under real operating conditions. Experimental data on the operation of boiler plants are presented. The dependences of the fuel consumption of boiler plants on the temperature and pressure of the coolant are obtained. Statistical analysis is applied to the collected data. Conclusions are formulated and a promising direction is laid out for further research and improvement of coil type steam boilers. Equations are proposed for calculating the convective component of radiant-convective heat transfer in gas ducts, taking into account the design features of boiler units by introducing new correction factors. Comparison of the calculated and experimental data showed their satisfactory agreement.

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Section: Review Of Work On the Research Topicmentioning

confidence: 99%

Experimental Study of a Coil Type Steam Boiler Operated on an Oil Field in the Subarctic Continental Climate

2021

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“…The input image RGB value is transformed to a grayscale value between 0 ~ 255 through (7) in the image grayscale part, in order to facilitate subsequent calculation [16,17].…”

Section: Approach One: Detection Of Grain Size Of Low Carbon Steelmentioning

confidence: 99%

“…Digital metallographic detection is mostly used for structural analysis [2][3][4][5] and failure analysis [6][7][8]; it is also applied in the calculation of wear and life prediction [9,10]. Papa and Albuquerque adopted the digital image detection method in their analysis of gray cast iron and nodular cast iron and successfully distinguished the type of gray cast iron (Type) and statistical particle number [11,12].…”

Section: Introductionmentioning

confidence: 99%

A Digital Evaluation Approach for Nodule Size Analysis of Pearlite Mixture Phase Structure in Steel

Huang

Wang

Chang

et al. 2020

Metallogr. Microstruct. Anal.

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This study employed a digital evaluation approach for determining the nodule size of a no heat-treatment pearlite structure, as well as the grain size of the ferrite phase via an image morphology process methodology. The grain size of steel has great influence on the mechanical properties of manufactured materials, making it a necessary metallographic inspection item for materials. The properties affected by grain size include hardness, failure life, ultimate stress, electric characteristics, and heat expansion rate. In general, grain size inspection has two approaches: manual comparison and digital computation. In manual comparison, the comparison of standard graphics or the observation of an eyepiece inserted on a microscope can be progressed. For digital computation, planimetric and intercept procedures are applied according to international standards. This study thus applied an image processing algorithm to identify the observed image after undergoing seven times of erosion and dilation operations.

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“…The typical structure of low carbon steel consists of ferrite and perlite's grains, with equal dimensions in all directions of the structure. The microstructure that contains ferrite and perlite with a low content of inclusions is typical for low carbon steel used in boilers (Gong et al, 2010), (Duarte et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Cycles of Thermal Fatigue in Steel Metallurgical Aspects ASTM SA-516 Grade 60

Bicharra¹,

Medeiros²,

Biehl³

et al. 2020

American Journal of Engineering and Applied Sciences

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The ASTM SA-516 steel has applications in compact steam boilers of low and medium temperature and pressure. Deterioration can show when exposed to high temperatures due to fuel gases burning. Failures detected by inspections done in a frequency required by standard on the boilers. Among the main failure mechanisms found in materials used in boilers, creep, corrosion, when subjected to the action of the combustion gases or steam oxidation conditions, thermal fatigue and others can be mentioned. This work evaluates the effect of thermal fatigue in the metallurgical aspects of steel ASTM SA-516 grade 60. After the initial characterization of the steel checked that it heeds the specifications required by the standard, showing a microstructure of ferrite and perlite. The tests in heat transfer conditions produce temperatures between 750 to 850C on the surface, starting with an oxidizing flame produced by oxygen and acetylene gases. The cooling was by water, being the samples were submitted to several cycles of heating and cooling, causing thermal fatigue. After the tests, occurs the characterized of the samples through optical microscopy techniques, Scanning Electronic Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Vickers hardness and macrostructure analysis. ferrite, perlite colonies and no tempered martensite were the microstructures detected on the Heat-Affected Zone (HAZ). On substrate's region was not detected anisotropy or significant variations. When analyzing austenitic grain size was observed a refinement showing 12 ASTM grain size considered extra fine. The higher microhardness values occurred at the surface. The surface has had been affected by heat due to heating in intercritical and austenitization temperature and the cooling by water.

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Failure analysis of the wall tubes of a water-tube boiler

Cited by 74 publications

References 9 publications

Experimental Study of a Coil Type Steam Boiler Operated on an Oil Field in the Subarctic Continental Climate

Experimental Study of a Coil Type Steam Boiler Operated on an Oil Field in the Subarctic Continental Climate

A Digital Evaluation Approach for Nodule Size Analysis of Pearlite Mixture Phase Structure in Steel

Effect of Different Cycles of Thermal Fatigue in Steel Metallurgical Aspects ASTM SA-516 Grade 60

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