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Controlling particle adhesion of synthetic and sewage sludge ashes in high temperature combustion using metal oxide nanoparticles
[Display omitted] •Adhered ashes inhibit energy recovery and stable operation of the plant.•Adhesion of ash particles at high temperatures should be controlled.•Synthetic ashes are a good tool to understand the chemical effects of adhesiveness.•Metal oxide nanoparticles can control particle adhesion...
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Published in: | Fuel (Guildford) 2022-08, Vol.321, p.124110, Article 124110 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | [Display omitted]
•Adhered ashes inhibit energy recovery and stable operation of the plant.•Adhesion of ash particles at high temperatures should be controlled.•Synthetic ashes are a good tool to understand the chemical effects of adhesiveness.•Metal oxide nanoparticles can control particle adhesion in ash samples.•Both chemical and physical effects are important to control the adhesiveness.
During combustion, ash particles can adhere to the internal walls of the plant due to partial melting and generate a liquid bridge force at the high operating temperatures. The adhered ashes inhibit energy recovery and stable operation of the plant. To achieve highly efficient energy recovery during combustion, it is necessary to investigate suitable methods to control adhesiveness according to each operational case. Herein, the ability of small amount (1–3 wt%) of nanoparticles (NPs: SiO2 NPs, Al2O3 NPs, and Fe3O4 NPs) as additives to control the adhesiveness at high temperatures was investigated. The controllability of each type of NP with respect to the adhesiveness of various synthetic ashes, which served as model compounds, was evaluated to clarify the role played by the different NPs. To demonstrate the practical utility of the NPs as additives, ash samples derived from the incineration of sewage sludge were investigated. Given the chemical complexity of the ash systems, it was discovered that a chemical effect and an increase in the porosity of the powder bed can effectively decrease the adhesiveness of ash particles produced at high temperatures. |
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ISSN: | 0016-2361 1873-7153 |
DOI: | 10.1016/j.fuel.2022.124110 |