Research Progress on High Temperature Corrosion Mechanism of Waste Incineration Power Generation Boiler

Qu, Zuopeng; Zhong, Rigang; Wang, Lei; Zhao, Wenbo; Tian, Xinli; Wang, Haijun

doi:10.1088/1755-1315/598/1/012008

Cited by 6 publications

(6 citation statements)

References 9 publications

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“…Obviously, it is different from the conclusions made by Wang et al During the volatilization of CaCl 2 -added BOF slags, the contents of CaCl 2 and FeO in the slags influence the volatilization evidently. The study results are in agreement with previous studies [35–37]. In contrast, in the case of CaF 2 -containing BOF slags, the volatilization is not controlled by the content of FeO in the slags.…”

Section: Resultssupporting

confidence: 92%

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Study on volatilization behaviour of BOF converter slag containing CaCl₂

Yan

Deng

Zhu

2023

Ironmaking & Steelmaking

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The volatilization behaviour of CaCl 2 -containing basic oxygen furnace (BOF) slags was investigated in laboratory at steelmaking temperature. During the melting process, the volatilization ratio was measured, and the volatile compounds were collected with some conductive tapes. Thermogravimetric analysis was conducted to clarify the volatilization of CaCl 2 -containing slags, and the volatilization ratio was also calculated by the thermodynamic software HSC. It was found that volatilization takes place in both CaCl 2 -containing and CaF 2 -containing BOF slags, but their influential mechanisms are different. FeCl 2 is the main volatile compound in CaCl 2 -containing BOF slags. The increasing contents of CaCl 2 and FeO in these slags are favourable for volatilization, while higher slag basicity plays the opposite role. In the case of CaF 2 -containing BOF slags, the volatilization compounds have little relation to the FeO content in the slags, and the volatilization ratio is smaller than that of CaCl 2 -containing BOF slag.

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Section: Resultssupporting

confidence: 92%

“…As mentioned above, the volatile compounds of CaO–SiO 2 –FeO–CaCl 2 slag system can be confirmed as FeCl 2 . Some researchers reported that Equations (2) and (3) would occur at high temperature [35]. In this study, these reactions are also applicable in the CaCl 2 -containing BOF slag system.…”

Section: Resultsmentioning

confidence: 74%

Study on volatilization behaviour of BOF converter slag containing CaCl₂

Yan

Deng

Zhu

2023

Ironmaking & Steelmaking

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“…4/3MCl g O 2/3M O s 4/3Cl (12) This chlorination-oxidation cycle, which is referred to as active oxidation, causes rapid consumption of the steel matrix without the need to supply chlorine from the atmosphere [5][6][7] .…”

Section: S MCL G (11)mentioning

confidence: 99%

“…This situation accelerates the oxidation/corrosion of alloys. [5][6][7] An external chromium oxide (Cr 2 O 3 ) has the ability to protect steel against chlorination atmospheres to some extent. However, over the long term, it loses its protective function.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature Gradient in Ash on High-Temperature Corrosion of Super-Heater Material in a Waste Power Generation Boiler

Furugaki¹,

Takahashi²,

Hayashi

2022

Oxid Met

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The effect of the temperature gradient in ash deposition on the high-temperature corrosion behavior of heat-resistant steels used for super-heater tubes in a Waste-to-energy (WTE) boiler plant was investigated by conducting ash embedded corrosion tests using combustion ash from the actual boiler. The ash embedded corrosion test was carried out under two conditions: 1) an isothermal corrosion test at 460 °C, and 2) a temperature gradient corrosion test with a specimen temperature of 460 °C and an atmospheric temperature of 685 °C in air. The corrosion mass loss was found to be much greater under higher atmospheric temperatures where the same specimen temperature was maintained than under the same atmospheric temperatures where the specimen temperature was kept at a constant 460 °C. The cross-sectional observation of the ash after the temperature gradient corrosion test revealed that the alkali salt mixture was melted in the region above the melting point of the ash, however, no penetration of the melt reaching to the specimen surface was confirmed, suggesting that the corrosion was produced by a gas-solid reaction. Thus, the faster corrosion kinetics of the heat-resistant steels under an ash deposit with a temperature gradient can be attributed to breakdown of an initially formed protective Crrich oxide scale by a reaction with a vapor of alkali salts to form less protective alkaline chromates. The difference in the potentials of the alkali salt across the ash deposit due to the temperature gradient could be the driving force that increases the flux of the alkali salts towards the specimen surface, which accelerates the formation of chromates and the rate of breakdown of the protective Cr-rich oxide scale.

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“…These corrosion products accumulate on the hot section components, which react with metals, causing metals to deteriorate and component life to be reduced. Molten salts must be used to shield the hot section components from excessive temperatures [6][7][8]. The waste materials can be effectively treated by the application of MSW, and it can produce electric power.…”

Section: Introductionmentioning

confidence: 99%

Improvements on hot corrosion behaviour of HVOF coated CO₂ laser beam and pulsed gas tungsten arc weldments in 2.5% sulphur gas plus molten salt in industrial waste incinerator environment

Arivarasu

2022

Eng. Res. Express

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This research article discusses in detail how the rate of corrosion increases for the Alloy 254 in the molten salt mixture of 10 wt% NaCl + 40 wt.% K2SO4 +40 wt.% Na2SO4 + 10 wt.% KCl and corrosive gas combination of 2.5 % SO2 + 3 % O2 + 25 % CO2 + 69.5 % N2 in simulated municipal solid waste incinerator environment at 700°C and 800°C. Thermogravimetric analysis is adapted to analyze the corrosion rate. As a result of the impact of molten salt and corrosive gas, hot corrosion by-products such as sulphides, chlorides and Na are produced, which are observed to increase the severity of corrosion rate. The study provides a detailed analysis of the metallurgical changes along the cross-section on the hot corroded samples by optical and scanning electron microstructural image analysis. X-ray diffraction analysis was used to know about the corrosion products formed during corrosion. Formation of the major protective oxide phases such as NiCr2O4, Cr2O3, NiO and CrMnO4 provide better corrosion resistance to the substrate in the coated samples. The diffusion of the corrosive elements along the cross-section of various zones of the weldment was analyzed in detail using Electron dispersive spectroscopy data in the point scan, line scan, and X-ray mapping techniques. Thermal spray coatings were found to be effective to prevent the hot corrosion, however, a higher weight gain (17.75 mg/cm2) was observed on the pulse current gas tungsten arc weldment sample in the simulated environment compared to a weight gain (2.66 mg/cm2) base metal specimen at 700°C. Spallation of coated surface occurred at 800°C, and it could be concluded that the coating has been found to be effective in preventing the hot corrosion and safe to operate at a temperature of 700°C for Alloy 254 in this aggressive simulated environment.

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Research Progress on High Temperature Corrosion Mechanism of Waste Incineration Power Generation Boiler

Cited by 6 publications

References 9 publications

Study on volatilization behaviour of BOF converter slag containing CaCl₂

Study on volatilization behaviour of BOF converter slag containing CaCl₂

Effect of Temperature Gradient in Ash on High-Temperature Corrosion of Super-Heater Material in a Waste Power Generation Boiler

Improvements on hot corrosion behaviour of HVOF coated CO₂ laser beam and pulsed gas tungsten arc weldments in 2.5% sulphur gas plus molten salt in industrial waste incinerator environment

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Research Progress on High Temperature Corrosion Mechanism of Waste Incineration Power Generation Boiler

Cited by 6 publications

References 9 publications

Study on volatilization behaviour of BOF converter slag containing CaCl2

Study on volatilization behaviour of BOF converter slag containing CaCl2

Effect of Temperature Gradient in Ash on High-Temperature Corrosion of Super-Heater Material in a Waste Power Generation Boiler

Improvements on hot corrosion behaviour of HVOF coated CO2 laser beam and pulsed gas tungsten arc weldments in 2.5% sulphur gas plus molten salt in industrial waste incinerator environment

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Study on volatilization behaviour of BOF converter slag containing CaCl₂

Study on volatilization behaviour of BOF converter slag containing CaCl₂

Improvements on hot corrosion behaviour of HVOF coated CO₂ laser beam and pulsed gas tungsten arc weldments in 2.5% sulphur gas plus molten salt in industrial waste incinerator environment