Study on high temperature corrosion mechanism of water wall tubes of 350 MW supercritical unit

Sun, Xia; Ning, Yuheng; Yang, Jian; Zhao, Yong; Yang, Zhanjun; Zhou, Xuzhe

doi:10.1016/j.engfailanal.2020.105131

Cited by 18 publications

(2 citation statements)

References 4 publications

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“…Due to the complexity of combustion conditions and gas-solid flow, high-temperature corrosion of water-cooled wall pipes is caused and influenced by various factors [6]. With the improvement of unit parameters and the modification of low NOx burners, the problem of high-temperature corrosion of water-cooled wall pipes has become more serious, which leads to a higher possibility of boiler pipe explosion [7].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Monitoring Techniques in Subcritical and Supercritical Water Environments

Li,

Bai,

Xing

et al. 2024

Applied Sciences

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A series of advanced equipment exposed to sub-/supercritical water environments at high temperatures, high pressures, and extreme water chemistry with high salt and dissolved oxygen content faces serious corrosion problems. Obtaining on-site corrosion data for typical materials in harsh environments is crucial for operating and maintaining related equipment and optimizing various corrosion prediction models. First, this article introduces the advantages and disadvantages, usage scenarios, and future development potential of several in situ monitoring technologies, including ultrasonic thickness measurement, the infrared thermography method, microwave imaging, eddy current detection, and acoustic emission. Considering the importance of electrochemical corrosion data in revealing microscale and nanoscale corrosion mechanisms, in situ testing techniques such as electrical resistance probes, electrochemical corrosion potential, electrochemical impedance spectroscopy, and electrochemical noise that can be applied to sub-/supercritical water systems were systematically discussed. The testing platform and typical data obtained were discussed with thick and heavy colors to establish a mechanical prediction model for corrosion behavior. It is of great significance to promote the development of corrosion monitoring techniques, such as breaking through testing temperature limitations and broadening the industrial application scenarios and maturity.

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Section: Introductionmentioning

confidence: 99%

Corrosion Monitoring Techniques in Subcritical and Supercritical Water Environments

Li,

Bai,

Xing

et al. 2024

Applied Sciences

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“…Membrane water wall is widely used in power plant boilers because of its reliably sealing, high heat absorption efficiency and ease of suspension [3]. However, attention must be paid to the occurrence of misuse of material [4], ash accumulation on the outer wall, cocking, scaling, local uneven heating, welding defects of the water wall tube [5][6][7], unqualified coal [8] and water [9] and water hammer phenomenon [10]. Otherwise, it will affect the heat transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of a Deep Pit on the Inner Wall of Water Wall Tube in a Power Plant

Zhang¹,

Fang²,

Tao³

et al. 2023

J. Phys.: Conf. Ser.

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A deep pit on the inner wall of a water wall tube of a 600MW boiler was found at the extension end of the front of the furnace during an overhaul after 200 thousand hours of operation. To investigate the causes of the failure, various techniques including macroscopic inspection, chemical composition analysis, microstructural analysis, mechanical performance testing, scanning electron microscope (SEM) observation and energy dispersive spectroscopy (EDS) analysis were carried out. The results of investigations showed that the chemical composition of the as-received tube conformed with SA-178 Grade C and the mechanical properties were qualified. EDS analysis revealed that the main elements of the deposit on the surface of the pit were iron and oxygen, along with phosphorus, potassium and aluminium, which were identified with the constitutes of the under deposit corrosion products. Based on the results, the cause of the failure is under deposit corrosion. Possible measures to combat the corrosion were proposed.

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Hot Corrosion Behaviour of Incoloy 800H Superalloy with Various Molten Salts Environment

Hariharan¹,

Anderson²,

Ravikumar³

2022

Recent Advances in Thermofluids and Manufacturing Engineering

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Study on high temperature corrosion mechanism of water wall tubes of 350 MW supercritical unit

Cited by 18 publications

References 4 publications

Corrosion Monitoring Techniques in Subcritical and Supercritical Water Environments

Corrosion Monitoring Techniques in Subcritical and Supercritical Water Environments

Failure Analysis of a Deep Pit on the Inner Wall of Water Wall Tube in a Power Plant

Hot Corrosion Behaviour of Incoloy 800H Superalloy with Various Molten Salts Environment

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