Integrating Flow Field Dynamics and Chemical Atmosphere Predictions for Enhanced Sulfur Corrosion Risk Assessment in Power Boilers

In this work, we attempt to explain the phenomenon of sulfur corrosion of power boiler water walls under the conditions of large fluctuations in carbon monoxide concentrations. To assess the conditions required for corrosion formation, a criterion based on the chemical and flow field parameters of t...

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Bibliographic Details
Published in:Materials 2024-10, Vol.17 (19), p.4919
Main Authors: Kardaś, Dariusz, Polesek-Karczewska, Sylwia, Wardach-Świȩcicka, Izabela
Format: Article
Language:English
Subjects:
Boilers
Chlorine
Coal-fired power plants
Combustion
Computer software industry
Corrosion
Corrosion rate
Corrosion tests
Criteria
Energy industry
Equipment and supplies
Flue gas
Fluid dynamics
Heating
Industrial plant emissions
Mixtures
Numerical models
Parameter modification
Pulverized coal
Risk assessment
Simulation
Steel
Sulfur
Sulfur compounds
Turbulence models
Turbulent flow
Velocity distribution
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Summary:In this work, we attempt to explain the phenomenon of sulfur corrosion of power boiler water walls under the conditions of large fluctuations in carbon monoxide concentrations. To assess the conditions required for corrosion formation, a criterion based on the chemical and flow field parameters of the flue gas is proposed. The formulated sulfur corrosion criterion is based on the mixture fraction variance and the turbulence time scale. Numerical modeling of coal combustion in a 250 MW power boiler is performed using ANSYS. Two cases of combustion in a boiler are analyzed, with the first simulating the boiler operated using classic high-swirl burners and the second one accounting for boiler operation with modified low-swirl burners. Calculations of pulverized coal combustion are performed using the standard k-ε turbulence model and the combustion described by the mixture fraction. The simulation results reveal that the low-swirl burner is characterized by higher values of the mixture fraction variance and a higher frequency of fluctuation of the velocity field, which is strongly related to an increased corrosion rate. The study outcomes show the validity of using the criterion of the mixture fraction variance and velocity field fluctuations to determine the areas at risk of sulfur corrosion.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17194919