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Deposit Shedding in Biomass-Fired Boilers: Shear Adhesion Strength Measurements
Abstract
Ash deposition on boiler surfaces is a major problem encountered in biomass combustion. Timely removal of ash deposits is essential for optimal boiler operation. In order to improve the understanding of deposit shedding in boilers, this study investigates the adhesion strength of biomass ash from full-scale boilers, as well as model fly ash deposits containing KCl, K 2 SO 4, CaO, CaSO 4, SiO 2, K 2 CO 3, Fe 2 O 3, K 2 Si 4 O 9, and KOH. Artificial biomass ash deposits were prepared on superheater tubes and sintered in an oven with temperatures ranging from 500 to 1000 °C. Subsequently, the deposits were sheared off by an electrically controlled arm, and the corresponding adhesion strength was measured. The effect of sintering temperature, sintering time, deposit composition, thermal shocks on the deposit, and steel type was investigated. The results reveal that the adhesion strength of ash deposits is dependent on two factors: ash melt fraction, and corrosion occurring at the deposit–tube interface. Adhesion strength increases with increasing sintering temperature, sharply increasing at the ash deformation temperature. However, sintering time, as well as the type of steel used, does not have a significant effect under the investigated conditions. Addition of compounds which increase the melt fraction of the ash deposit, typically by forming a eutectic system, increases the adhesion strength, whereas addition of inert compounds with a high melting point decreases the adhesion strength. Furthermore, the study indicated that sulfation of ash deposits leads to an increase in adhesion strength, while cooling down the deposits after sintering decreases the adhesion strength. Finally, it was observed that adhesion strength data follow a log-normal distribution.
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The shear adhesion strength of slag deposits varied significantly, ranging from 1 to 350 kPa, depending on sintering temperature, ash deposit compositions, and eutectic point of the ash deposits.
“The shear adhesion strength depended on factors such as sintering temperature, ash deposit compositions, and eutectic point of the ash deposits. The adhesion strength varied significantly, ranging from 1 to 350 kPa, depending on the aforementioned factors.”
From High Temperature Corrosion Resistant and Anti-slagging Coatings for Boilers: A Review (2024) · cites this paper as [153]
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Metadata
- Authors
- Laxminarayan, Y., Jensen, P. A., Wu, H., Frandsen, F. J., Sander, B., & Glarborg, P.
- Affiliations
- Technical University of Denmark (DK)
- Ørsted (Denmark) (DK)
- Corresponding author
- Laxminarayan, Yashasvi
- Venue
- Energy & Fuels
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-07-20
- Volume
- 31
- Issue
- 8
- Pages
- 8733-8741
- ISSN
- 0887-0624 (ISSN-L)
- 1520-5029
- OpenAlex
- W2603074578
- Cited by
- 23
- References
- 55
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 4 · 2022: 5 · 2021: 3 · 2020: 2 · 2019: 1 · 2018: 4 · 2017: 1
- FWCI
- 0.99
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Energy & Fuels (publishedVersion)
- Funders
- Danmarks Tekniske Universitet
- Energinet.dk
- DONG Energy
- Topics
- Physical Sciences › Energy › Fuel Technology › Thermochemical Biomass Conversion Processes
- Physical Sciences › Materials Science › Surfaces, Coatings and Films › High-Temperature Coating Behaviors
- Physical Sciences › Engineering › Mechanical Engineering › Coal Combustion and Slurry Processing
- Keywords
- biomass ash, biomass boiler, superheater tubes, ash sintering, eutectic systems, sulfation, thermal shock, lognormal distribution
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