A Simple Phase Equilibrium Approach To the Problem of Oil-Ash Corrosion

Foster, Wendy K.; Leipold, M. H.; Shevlin, T.S.

doi:10.5006/0010-9312-12.11.23

Cited by 10 publications

(4 citation statements)

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“…The liquid sodium vanadates centering about the composition Na,0.6V205 are considered to be the most corrosive (4,5). Ferric vanadates and chromic vanadates are often present in the fly ash deposits as corrosion products.…”

Section: Introductionmentioning

confidence: 99%

Solid–Liquid Phase Equilibria for the Ternary Systems V₂O₅–Na₂O–Fe₂O₃, V₂O₅–Na₂O–Cr₂O₃, and V₂O₅–Na₂O–MgO

Kerby¹,

Wilson²

1973

Can. J. Chem.

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The phase equilibrium relationships of several vanadate systems have been studied by a combination of differential thermal analysis (DTA) and X-ray powder diffraction methods. All systems studied were eutectic in nature. The liquidus temperatures of the sodium vanadates were found to depend on the oxygen partial pressure for sodium oxide concentrations between 1.0 and 36 mol%. This effect was not observed for the ferric vanadate, chromic vanadate or magnesium vanadate systems. The solid-liquid phase equilibria for the ternary vanadate systems V205-Na,O-Fe203, V205-Na20-Cr203, and V2O5-Na20-Mg0 were measured by determining the temperature-composition data for various quasibinary systems within each ternary system. Liquidus temperatures between 500 and 700 "C were found for those compositional ranges containing greater than 40 mol% V205 and between 10 and 60 mol% Na,O. The liquidus temperatures decreased with increasing oxygen partial pressure over much of the same compositional range.

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Section: Introductionmentioning

confidence: 99%

Solid–Liquid Phase Equilibria for the Ternary Systems V₂O₅–Na₂O–Fe₂O₃, V₂O₅–Na₂O–Cr₂O₃, and V₂O₅–Na₂O–MgO

Kerby¹,

Wilson²

1973

Can. J. Chem.

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“…This damage is obviously derived from the corrosion by vanadium (vanadium attack), because the ash, which deposited on the surfaces of the superheater and reheater tubes includes vanadium compounds from 30 to 50 mass% and it is low-melting eutectics. The fundamental corrosion reaction is considered that the accelerated oxidation corrosion reaction by vanadium complex contained in combustion ash, is dominant as follows (Ref 17,18):…”

Section: Corrosion Proof/anti-corrosion Effects Of Plasma Sprayed Coamentioning

confidence: 99%

Enhancement of Service Life of Steam Generating Tubes in Oil-Fired Boiler for Power Generation Employing Plasma Spray Technology

Tani

Harada

2007

J Therm Spray Tech

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The effects of Ni-50 mass% Cr alloy coating, that is plasma-sprayed onto the fire-side of steam generating tubes in a heavy oil-fired boiler, on the high temperature corrosion resistance were examined. One of the severe environments in the industrial manufacturing facilities, where thermal sprayed coatings are employed, is the high temperature corrosion such as the oxidation, sulfidation, and low melting fuel ash corrosion in the fire-side of boiler tubes. In the fossil fuel-fired steam generating boiler facilities, the degradation or failure of steam generating tubes that were derived from the contaminants in a lower grade fuel have often occurred. The situation of degradation of the water evaporator and superheater tubes and corrosion-preventing effects of plasma sprayed coating are described. The enhanced effects of plasma sprayed Ni-50 mass% Cr alloy coating for the suppression of hot corrosion failure of the steam generating tubes of boiler are summarized.

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“…Foster et al [22] Studied the Na 2 SO 4 -V 2 O 5 system theoretically from the perspective of phase equilibrium. The results show that the potentially corrosive substance in the putty are NaVO 3 and Na 2 O•3V 2 O 5 ; when the molar ratio of Na/V is 1:6, a highly corrosive vanadate Na 2 O•V 2 O 4 •5V 2 O 5 will be formed.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Behavior of Inconel 625 in Na2SO4 and V2O5 Molten Salt System

Xue

et al. 2023

Metals

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This study aimed to examine the corrosion behavior of Inconel 625 in a molten salt system of sodium sulfate and vanadium pentoxide at varying temperatures and durations. The corrosion products, microstructure, and element distribution of hot extruded Inconel in Na2SO4 and V2O5 molten salt systems were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) analyses. This study demonstrates that corrosion of the alloy increases with time at a constant temperature. During the initial stage of corrosion, the surface of the alloy is primarily composed of a dense oxide layer consisting of Cr2O3 and NiO. However, after exposure to the salt bath for 24 h, a chemical reaction occurs between the alloy and vanadium (V), resulting in the formation of CrVO4 and Ni3V2O8. Furthermore, the intrusion of sulfur (S) element into the matrix leads to the formation of internal sulfides, including Ni-, Cr-, and Mo-based sulfides, which accelerate intergranular and intracrystalline corrosion. As the corrosion temperature rises, the surface microstructure of the corrosion layer transforms from powder to salt particles and then to massive particles. The corrosion products exhibit a clear stratification, while the alloy undergoes simultaneous oxidation and vulcanization processes.

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A Simple Phase Equilibrium Approach To the Problem of Oil-Ash Corrosion

Cited by 10 publications

References 0 publications

Solid–Liquid Phase Equilibria for the Ternary Systems V₂O₅–Na₂O–Fe₂O₃, V₂O₅–Na₂O–Cr₂O₃, and V₂O₅–Na₂O–MgO

Solid–Liquid Phase Equilibria for the Ternary Systems V₂O₅–Na₂O–Fe₂O₃, V₂O₅–Na₂O–Cr₂O₃, and V₂O₅–Na₂O–MgO

Enhancement of Service Life of Steam Generating Tubes in Oil-Fired Boiler for Power Generation Employing Plasma Spray Technology

Hot Corrosion Behavior of Inconel 625 in Na2SO4 and V2O5 Molten Salt System

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A Simple Phase Equilibrium Approach To the Problem of Oil-Ash Corrosion

Cited by 10 publications

References 0 publications

Solid–Liquid Phase Equilibria for the Ternary Systems V2O5–Na2O–Fe2O3, V2O5–Na2O–Cr2O3, and V2O5–Na2O–MgO

Solid–Liquid Phase Equilibria for the Ternary Systems V2O5–Na2O–Fe2O3, V2O5–Na2O–Cr2O3, and V2O5–Na2O–MgO

Enhancement of Service Life of Steam Generating Tubes in Oil-Fired Boiler for Power Generation Employing Plasma Spray Technology

Hot Corrosion Behavior of Inconel 625 in Na2SO4 and V2O5 Molten Salt System

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Solid–Liquid Phase Equilibria for the Ternary Systems V₂O₅–Na₂O–Fe₂O₃, V₂O₅–Na₂O–Cr₂O₃, and V₂O₅–Na₂O–MgO

Solid–Liquid Phase Equilibria for the Ternary Systems V₂O₅–Na₂O–Fe₂O₃, V₂O₅–Na₂O–Cr₂O₃, and V₂O₅–Na₂O–MgO