Desulfurized flue gas corrosion coupled with deposits in a heating boiler

Pan, Peiyuan; Chen, Heng; Liang, Zhiyuan

doi:10.1016/j.corsci.2017.11.009

Cited by 27 publications

(8 citation statements)

References 41 publications

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“…NH 4 Cl derived from the selective noncatalytic reduction (SNCR) DeNO x unit and CaSO 4 and MgCl 2 from the wet flue gas desulfurization were also found to dissolve and give rise to horrible corrosion on the metal parts downstream. 10,26,27 Corrosion caused by the hygroscopic deposits at the coldend of boilers is undoubtedly a critical factor influencing the flue gas cleaning and heat recovery system. Heat recovery from the flue gas greatly benefits the thermal efficiency of the boiler but also increases the danger of water absorption by the deposits, especially on the low-temperature heat transfer surfaces.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Hygroscopicity of Deposits at the Cold-End of Biomass and Coal-Fired Plants

et al. 2021

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At the "cold-end" of biomass and coal-fired plants, with decreasing temperature and increasing relative humidity (RH) of the flue gas, moisture absorption by the hygroscopic deposits may electrochemically cause corrosion of the metal parts, especially during the downtime. In this paper, 10 deposit samples were collected from different sections of biomass-fired and coal-fired plants. The hygroscopicity of the deposit samples was studied by electrochemical impedance and gravimetric water vapor absorption techniques, and representative salt powders and their binary mixtures were also tested for reference. The critical relative humidity (CRH) level in the water absorption process and water absorption capacity at varying RH values were investigated, which were two aspects of the hygroscopicity of the tested salt powders. Deliquescence was the determining factor in dissolution of the soluble salt powders, including CaCl 2 , MgCl 2 , KCl, and K 2 SO 4 . Meanwhile, CaSO 4 and CaCO 3 powders formed a small amount of solution mainly through the crystal hydration and capillary condensation, respectively. The deposit samples, as mixtures of various components, usually did not show a specific CRH but rather absorb moisture gradually. Dissolution of the deposits is typically initiated from 15%RH to 20%RH at 25 °C or from an even lower RH at higher temperatures, which could be greatly mitigated by some highly hygroscopic components, like CaCl 2 and MgCl 2 . Corrosion resulting from the hygroscopic deposits could be alleviated by reducing the chloride content in the flue gas and raising the metal surface temperature.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Hygroscopicity of Deposits at the Cold-End of Biomass and Coal-Fired Plants

et al. 2021

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“…Electric power, metallurgy, and petrochemical industries are often plagued by sulfuric acid dew point corrosion. One of the most serious corrosion components in thermal power plants is the gas‐gas heat (GGH) exchanger in desulfurization system 1,2 . The SO 2 and SO 3 produced by burning S‐containing fuel will react with water to form sulfuric acid vapor.…”

Section: Introductionmentioning

confidence: 99%

Thermal shock and sulfuric acid corrosion behavior of enamel–nano‐Ni composite/enamel–nano‐nickel composite coating

Chen

et al. 2020

Int J of Appl Glass Sci

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Dense and well‐adherent enamel–nano‐Ni composite/enamel–nano‐nickel composite coatings were prepared on 304 steel. Their thermal shock (TS) resistance at 400°C as well as the chemical stability in sulfuric acid solution were investigated, and compared with pure enamel coatings. Results indicated that the nanocomposite coatings with 5 wt% of Ni particles exhibited the best resistance to TS. Almost no spalling of the coating occurs after 50 cycles of TS at 400°C. They also provided enough protective effect to the substrates from sulfuric acid corrosion. After 7 days of corrosion, the weight loss of Ni‐5 enamel coating was only 1.107 mg/cm2.

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“…Besides approximately 79 ~ 85% N2 [1], this gas mixture, which could lead to serious corrosion on carbon steels and alloys used in casings and pipelines, still contains 10 ~ 15% CO2 and a little aggressive gas. Pan et al [2] have conducted in-plant corrosion tests of five steel in a heating boiler to investigate the desulfurized flue gas corrosion coupled with deposits after flue gas desulfurization (FGD) unit and concluded that surface temperature of the steel was proved to be the key factor in the corrosion process.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature on oxidation behaviours of 35CrMo in high temperature flue gas environment

et al. 2019

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The pipelines made by alloy 35CrMo are widely used in the process of flue gas injection. Therefore, corrosion behaviours of alloy 35CrMo have been investigated at varied temperatures, namely 120 °C, 150 °C, 200 °C and 250 °C, with same experimental pressure of 9 MPa and flus gas environment. Scanning electron microscopy was employed to examine the morphologies and microstructures of the oxide films. The results indicated that moderate temperature stands an essential role in the reaction mechanism and aggressive effects. In addition to increase in the diffusion rate of both alloy ions and corrosive gas, temperature can also reform the morphology of oxides by resulting in larger oxide particles and thicker oxide films, plus the transmission from needle-like oxides to spherical oxides.

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Desulfurized flue gas corrosion coupled with deposits in a heating boiler

Cited by 27 publications

References 41 publications

Investigation on the Hygroscopicity of Deposits at the Cold-End of Biomass and Coal-Fired Plants

Investigation on the Hygroscopicity of Deposits at the Cold-End of Biomass and Coal-Fired Plants

Thermal shock and sulfuric acid corrosion behavior of enamel–nano‐Ni composite/enamel–nano‐nickel composite coating

Effects of temperature on oxidation behaviours of 35CrMo in high temperature flue gas environment

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