Numerical investigation on optimization of wall jet to reduce high temperature corrosion in 660 MW opposed wall fired boiler
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Yong Zhang
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Yuyang Liu
Abstract
For an air staged combustion boiler, the rational organization of jets to form closing-to-wall film using as little air as possible plays a key role in resolving the high temperature corrosion problems. In this work, a comprehensive computational fluid dynamics (CFD) model including hydrodynamics and coal combustion is established for a 660 MW opposed wall fired boiler. Based on the grid independence and model validation, the flow field, temperature profile, and species concentration are predicted, and the influences of the structure of nozzles and the operation parameter of jets are further evaluated. The results show that the corrosion area of the side wall is dependent on the jet projection velocity and nozzle structures. The increase of the jet velocity does not always have an active influence on the reduction of corrosive area. Only increasing the nozzle diameter does not always have a positive impact on the improvement of the corrosion. The increase of the jet inclination angle can extend the jet trajectory, contributing to increase the oxygen coverage area. Reasonably adjusting the jet inclination angle of each layer can obtain the lower corrosion area. The increase of jet row number leads to a decrease in the spacing between rows, which enables the downstream jet to penetrate deeper into the cross stream. By increasing the number of jet layers and reducing the jet velocity of each layer, the lowest corrosion area can be obtained.
Funding source: National Excellent Doctoral Dissertation of PR China
Award Identifier / Grant number: (201440)
Funding source: Fundamental Research Funds for the Central Universities
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This study was financially supported by Foundation for the Author of National Excellent Doctoral Dissertation of PR China (201440) and the Fundamental Research Funds for the Central Universities.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Artikel in diesem Heft
- Frontmatter
- Articles
- Tribological characterization of graphene oxide by laser ablation as a grease additive
- Hydro-liquefaction of asphaltene catalyzed by molybdenum-nickel bimetallic catalysts in slurry bed
- Leaching kinetics of copper and valuable metal extraction from copper-cadmium residues of zinc hydrometallurgy by oxidation acid leaching
- Numerical investigation on optimization of wall jet to reduce high temperature corrosion in 660 MW opposed wall fired boiler
- Kinetics of catalytic treatment of coking wastewater (COD, phenol and cyanide) using wet air oxidation
- Controllable oxidation of cyclohexanone to produce sodium adipate in an electrochemical reactor with a Pt NPs/Ti membrane electrode
- Numerical study on key issues in the Eulerian-Eulerian simulation of fluidization with wide particle size distributions
- Dynamics investigation on methane hydrate formation process with combined promotion methods
