Selection and Analysis of Material for Boiler Pipes in a Steam Plant

Lazić, Vukić; Arsić, Dušan; Nikolić, Ružica R.; Rakić, Dragan; Aleksandrović, Srbislav; Djordjević, Milan; Hadzima, Branislav

doi:10.1016/j.proeng.2016.06.659

Cited by 20 publications

(12 citation statements)

References 6 publications

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“…Both charging and discharging pipes type P245GH [56] were made of SS316L stainless steel. The pipes were insulated with mineral wool with a thermal conductivity of 0.047-0.500 W/mK (at 100 °C).…”

Section: Description Of Tes Installationmentioning

confidence: 99%

Application of Phase Change Material and Artificial Neural Networks for Smoothing of Heat Flux Fluctuations

et al. 2021

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The paper presents an innovative method for smoothing fluctuations of heat flux, using the thermal energy storage unit (TES Unit) with phase change material and Artificial Neural Networks (ANN) control. The research was carried out on a pilot large-scale installation, of which the main component was the TES Unit with a heat capacity of 500 MJ. The main challenge was to smooth the heat flux fluctuations, resulting from variable heat source operation. For this purpose, a molten salt phase change material was used, for which melting occurs at nearly constant temperature. To enhance the smoothing effect, a classical control system based on PID controllers was supported by ANN. The TES Unit was supplied with steam at a constant temperature and variable mass flow rate, while a discharging side was cooled with water at constant mass flow rate. It was indicated that the operation of the TES Unit in the phase change temperature range allows to smooth the heat flux fluctuations by 56%. The tests have also shown that the application of artificial neural networks increases the smoothing effect by 84%.

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Section: Description Of Tes Installationmentioning

confidence: 99%

Application of Phase Change Material and Artificial Neural Networks for Smoothing of Heat Flux Fluctuations

et al. 2021

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“…The same applies for the places of joints in construction, where the referral is to the welded joints and vicinity of the weld and not to the material as a whole [8,16,23].…”

Section: Databasementioning

confidence: 99%

The Fault Tree Analysis of Causes of the Welded Pipes Failures in Exploitation

Nikolić¹,

Arsić²,

Arsić³

et al. 2020

Communications

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Premature failure or damage of parts and components of the oil and gas well piping, as well as pipelines for transport of oil and gas, are generally caused by the simultaneous influence of a large number of technological, metallurgical, structural and exploitation factors. Therefore, the convenient structural solutions, which provide the mechanical safety of parts and integrity of structures, can be realized only through total comprehension of their behavior in various operation regimes. Importance of technical diagnostics for monitoring and state analysis of welded pipes/pipelines in oil industry is considered in this paper. An analysis of causes of the welded pipes failures in exploitation has been performed through use of the fault tree analysis. Based on the suggested structure of a database, regarding the causes of failure, possibilities are presented to set measures for prevention of damage and failure of welded pipes/pipelines and for extension of their service life. A suggestion for improvement of the organizational scheme for monitoring the state and maintenance of welded pipes/pipelines during the exploitation has been made, as well.

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“…The groups of steels noted above differ in their strength properties at higher temperatures. Their resistance to oxidation in the flue gas environment is comparable [ 5 , 6 ]. For demanding operating conditions where high corrosion resistance is required while maintaining strength in the creep area, heat-resistant steels P91, P92, or martensitic 9Cr MarBN steels are used [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes

et al. 2021

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Corrosion of boiler tubes remains an operational and economic limitation in municipal waste power plants. The understanding of the nature, mechanism, and related factors can help reduce the degradation process caused by corrosion. The chlorine content in the fuel has a significant effect on the production of gaseous components (e.g., HCl) and condensed phases on the chloride base. This study aimed to analyze the effects of flue gases on the outer surface and saturated steam on the inner surface of the evaporator tube. The influence of gaseous chlorides and sulfates or their deposits on the course and intensity of corrosion was observed. The salt melts reacted with the steel surface facing the flue gas flow and increased the thickness of the oxide layer up to a maximum of 30 mm. On the surface not facing the flue gas flow, they disrupted the corrosive layer, reduced its adhesion, and exposed the metal surface. Beneath the massive deposits, a local overheating of the inner surface of the evaporator tubes occurred, which resulted in the release of the protective magnetite layer from the surface. Ash deposits reduce the boiler’s thermal efficiency because they act as a thermal resistor for heat transfer between the flue gases and the working medium in the pipes. The effect of insufficient feedwater treatment was evinced in the presence of mineral salts in the corrosion layer on the inner surface of the tube.

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Selection and Analysis of Material for Boiler Pipes in a Steam Plant

Cited by 20 publications

References 6 publications

Application of Phase Change Material and Artificial Neural Networks for Smoothing of Heat Flux Fluctuations

Application of Phase Change Material and Artificial Neural Networks for Smoothing of Heat Flux Fluctuations

The Fault Tree Analysis of Causes of the Welded Pipes Failures in Exploitation

Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes

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