High Temperature Corrosion of Superheater Tubes in Waste Incinerators and Coal-Fired Plants

Weulersse, Katia; Moulin, Gérard; Billard, Paul; Pierotti, G.

doi:10.4028/www.scientific.net/msf.461-464.973

Cited by 28 publications

(10 citation statements)

References 16 publications

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“…624°C for Na 3 Fe(SO 4 ) 3 ; 618°C for K 3 Fe(SO 4 ) 3 and 552°C for the blended compound of (Na, K) 3 Fe(SO 4 ) 3 . These melted compounds tend to cause instability [24][25][26]. in the scale by reacting with steel to produce internal sulfides as per the following reaction:…”

Section: Discussionmentioning

confidence: 99%

Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Agnihotri,

Kalsi,

Kansal

2023

Surface Engineering

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Hot corrosion of boiler tubes used in steam-generating systems has been recognized as a severe problem, resulting in tube wall thinning and premature failure. In this study, the effect of burnishing the thermal sprayed coatings against high-temperature corrosion of SA213-T22 boiler steel in actual environmental conditions of coal-fired boiler has been investigated. An experimental study was carried out for ten cycles, where the individual cycle consists of one-hundred hours of exposure trailed by one hour of ambient cooling. The hot corroded specimens are visually inspected at the end of each cycle to check for any variation in colour, luster, spalling tendency, and other physical changes in scale. The tested specimens were characterized through Thermogravimetric Technique, Microhardness Tester, Optical Microscope, Scanning Electron Microscope, and X-Ray Diffractometer to study their hot corrosion performance. The findings of this work suggest that burnishing can be potentially used for providing superior hot corrosion protection to any of the thermal sprayed coated specimens.

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Section: Discussionmentioning

confidence: 99%

Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Agnihotri,

Kalsi,

Kansal

2023

Surface Engineering

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“…Consequently, melts and substances with hygroscopic and deliquescent properties are formed and a high corrosion potential arises. All in all, the situation will be similar as described for other high-contamination, high-temperature facilities, and technologies [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mild Steel Corrosion in the Cement Production Associated with the Usage of Secondary Fuels

Thieme

Bergmann

Kiesewetter

et al. 2020

International Journal of Corrosion

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The present work deals with the corrosion of mild steel (1.0037) used as the outer construction material of the preheater of a modern industrial cement production facility. The facility uses secondary fuels, which introduce considerable amounts of corrosive species. The situation at the examination sites in the preheater zone is tracked over a period of two years including operation and shut-down periods. The investigation is focused on (i) the acquisition of the underlying physicochemical conditions, such as moisture, temperature, and contamination data at the examination site of the preheater, (ii) the multianalytical identification of the formed corrosion products using scanning electron microscopy combined with energy-dispersive X-ray analysis, infrared spectrometry, Raman spectrometry, X-ray diffractometry, and Möβbauer spectrometry, and (iii) voltammetric and EIS laboratory investigations using model solutions. It was evidenced that corrosion takes place at a temperature level of about 100°C in the presence of moisture and oxygen as well as chloride ion as a consequence of the usage of secondary fuels. Typical hot-gas corrosion could be excluded under the current conditions. Appearance, structure, and nature of the corrosion products were found to be not mainly dependent on the varied length of exposure, but on the conditions of the hosting preheater intake. In addition to different FeOOH phases and hematite, magnetite was found, dependent on the oxygen concentration in the process gas. The decisive role of oxygen as key factor for the corrosion rate was electrochemically confirmed.

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“…Analysis has shown the presence of various elements like Ca, Mg, Al, Si, Na, Cl, S, C as well as oxygen in fly ash of medical waste incinerators leading to accelerated corrosion of metals [6]. The synergistic interaction of high temperature and corrosive incineration environment may lead to premature failure of various components [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The degradation behaviour of nickel-based superalloys in the medical waste incineration plant

Lone

Rahman

2019

Sādhanā

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The present work was aimed at analysing the oxidation behaviour of three nickel-based superalloys-Superni 718, Superni 75 and Superni 750, by conducting in-situ study in the secondary chamber of a medical waste incinerator at 800-850°C for 1000 h. It was observed that among the three superalloys, Superni 75 is best suited for such an environment. This was concluded by comparing the weight change after 100 h for total 1000 h, constituting 10 thermal cycles. The morphology of the oxide scale formed on the substrate was analysed using FE-SEM. The elemental composition was obtained by EDS. The depth profiling of the scale was done using the XPS technique. The chemical composition was also examined by the XRD analysis. The superior oxidation property of Superni 75 is due to the higher Ni-Cr content. The oxidation resistance of the nickel-based superalloys in the aggressive environment of medical waste incinerator is attributed to the presence of chromia oxide-Cr 2 O 3 and spinel NiCr 2 O 4 .

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High Temperature Corrosion of Superheater Tubes in Waste Incinerators and Coal-Fired Plants

Cited by 28 publications

References 16 publications

Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Investigation of Mild Steel Corrosion in the Cement Production Associated with the Usage of Secondary Fuels

The degradation behaviour of nickel-based superalloys in the medical waste incineration plant

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