Effect of oxygenated treatment on corrosion of the whole steam–water system in supercritical power plant

Jiang, Dongfang; Xu, Hong; Deng, Bo; Li, Mengyuan; Xiao, Zhuonan; Zhang, Naiqiang

doi:10.1016/j.applthermaleng.2015.10.098

Cited by 18 publications

(10 citation statements)

References 17 publications

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“…On the other hand, it also shows that air has leaked in, creating a humid environment. As a result, the oxygen content in the tube is much higher than the requirements of the working conditions, which provides sufficient conditions for oxygen corrosion of the reheater tube [7] .…”

Section: Reason Analysis and Suggestionsmentioning

confidence: 99%

Failure Analysis and Protection of Oxygen Corrosion of Reheater Tube in a Power plant

Yang

Wang

et al. 2021

E3S Web Conf.

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The failure analysis of reheater tubes were analyzed by means of alloy composition analysis, metallographic structure analysis, mechanical properties analysis and oxide composition analysis. The results showed: The alloy composition meets the requirements of 12Cr1MoV standard. No abnormality was observed in metallographic structure. Mechanical properties qualified. Oxide components are mainly O and Fe. Comprehensive analysis shows that The main reason of reheater tube failure is oxygen corrosion, which caused thinning of the reheater tube wall, leading to leakage accident. Suggestions for subsequent protection are put forward.

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Section: Reason Analysis and Suggestionsmentioning

confidence: 99%

Failure Analysis and Protection of Oxygen Corrosion of Reheater Tube in a Power plant

Yang

Wang

et al. 2021

E3S Web Conf.

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“…The leakage factors of the water wall pipe are more complex than other "three pipes". The types of induced failures are more comprehensive, such as overheating explosion [1], corrosion failure [2][3][4][5], wear thinning, fatigue cracking [6][7], etc. This depends on the particularity of the operating environment of the water wall tubes, mainly located in the combustion zone inside the boiler.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of Cracking on the Outer Pipe of 12Cr1MoV Water Wall in Thermal Power Plants

Yang,

Wang,

et al. 2023

J. Phys.: Conf. Ser.

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In order to identify the main causes of cracking and leakage of 12Cr1MoV water wall tubes outside the furnace in thermal power plants, this paper uses macroscopic morphology observation, stereomicroscope observation, alloy composition analysis, Brinell hardness test, metallographic structure inspection, and other means to detect and analyze the failed water wall tube. The alloy composition content of the water wall tubes submitted for inspection is within the standard requirements, and the Brinell hardness value of the water wall tubes also meets the requirements of relevant standards, The matrix metallographic structure of the water wall tube is normal. The initial leakage point is the cracking of the fillet weld at the end of the water wall tube fin, while other leakage points are caused by the blowing of the medium leaked from the initial leakage point. The initial leakage point is formed by the fatigue crack initiated at the fillet weld of the fin end and the corrosion crack on the inner wall extending towards each other. It is recommended to further inspect whether there is still cracking at the end of adjacent water wall tube fins to prevent similar cracking from happening again. Due to the frequent changes in the “peak shaving” period and amplitude in recent years, it is necessary to design the peak shaving period or amplitude reasonably to ensure the safe operation of the boiler.

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“…Most of the existing thermal power plant units adopt supercritical units above 650 [3]. Meng and other researchers [4,5] found that boilers, reheaters, and superheaters at such high temperatures, are often prone to water vapor corrosion. In addition to depleting the service lives of the equipment, the oxides formed from the corrosion process also impedes the heat transfer efficiencies of the power plant units.…”

Section: Introductionmentioning

confidence: 99%

Growth Mechanism of Oxide Scale in Supercritical Unit

Li¹,

Lei

Yan

et al. 2022

Proceedings of the 2022 International Conference on Smart Manufacturing and Material Processing (SMMP2022)

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This work aims to address the severe film detachments from the surface of boiler steel in thermal power plants after steam corrosion attacks, especially as the accumulated detached oxide layers are prone to block boiler tubes, reducing their heat transfer efficiencies. The operational conditions of a typical thermal boiler were simulated with TP347H steel as the experimental material. Gravimetry, metallographic analysis, and scanning electron microscope were employed in the corrosion mechanism investigation of the boiler steel in high temperature steam, and the growth and shedding mechanism investigations of the corrosion product layers. The TP347H steel was rapidly oxidized in dry steam at 650 °C to generate Mn and Cr oxides, whereas Fe2+ was formed after the corrosion process. FeO and FeOOH layers were crystallized out of the Mn and Cr oxides, and the bond strength between the Mn and Cr oxides and the FeO and Fe2O3 layers was weak, making the detachments of the FeO and FeOOH layers quite easy. Continuous oxidation was observed when the oxidized film layer was exposed to the atmosphere, with some parts of the FeO in the film layer readily oxidizing to Fe2O3. This increased the stress in the film, thereby promoting the film detachment during exposure to the atmosphere. This research provides a theoretical basis for the corrosion protection of boiler tubes and their safe operations.

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Effect of oxygenated treatment on corrosion of the whole steam–water system in supercritical power plant

Cited by 18 publications

References 17 publications

Failure Analysis and Protection of Oxygen Corrosion of Reheater Tube in a Power plant

Failure Analysis and Protection of Oxygen Corrosion of Reheater Tube in a Power plant

Failure Analysis of Cracking on the Outer Pipe of 12Cr1MoV Water Wall in Thermal Power Plants

Growth Mechanism of Oxide Scale in Supercritical Unit

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