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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lindberg, Daniel
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2024Oxidation Behavior of AlxHfNbTiVY0.05 Refractory High-Entropy Alloys at 700–900 °Ccitations
- 2024Influence of PbCl2 and KCl salt mixture on high temperature corrosion of alloy 625citations
- 2023The effect of Cl, Br, and F on high-temperature corrosion of heat-transfer alloyscitations
- 2023Thermodynamic Model for High-Temperature Corrosion Applications: The (NaCl + Na2CO3 + Na2SO4 + Na2S2O7 + Na2CrO4 + Na2Cr2O7 + Na2MoO4 + Na2Mo2O7 + Na2O + KCl + K2CO3 + K2SO4 + K2S2O7 + K2CrO4 + K2Cr2O7 + K2MoO4 + K2Mo2O7 + K2O) System
- 2023Critical Evaluation and Calorimetric Study of the Thermodynamic Properties of Na2CrO4, K2CrO4, Na2MoO4, K2MoO4, Na2WO4, and K2WO4citations
- 2022Impact of recently discovered sodium calcium silicate solutions on the phase diagrams of relevance for glass-ceramics in the Na2O-CaO-SiO2 systemcitations
- 2022Experimental Thermodynamic Characterization of the Chalcopyrite-Based Compounds in the Ag–In–Te System for a Potential Thermoelectric Applicationcitations
- 2022Critical evaluation of CuSO4-H2O system up to solubility limit, from eutectic point to 373.15 Kcitations
- 2021Precious Metal Distributions Between Copper Matte and Slag at High PSO2 in WEEE Reprocessingcitations
- 2021Slag Chemistry and Behavior of Nickel and Tin in Black Copper Smelting with Alumina and Magnesia-Containing Slagscitations
- 2021Superheater deposits and corrosion in temperature gradient – Laboratory studies into effects of flue gas composition, initial deposit structure, and exposure timecitations
- 2020Formation of nitride and oxide inclusions in liquid Fe-Cr-Ti-Al alloyscitations
- 2020Thermodynamic behaviour of nitrogen in the carbon saturated Fe-Mn-Si alloy during castingcitations
- 2018Experimental investigation and thermodynamic re-assessment of the ternary copper-nickel-lead systemcitations
- 2018Thermodynamic Investigation of Selected Metal Sulfates for Controlling Fouling and Slagging During Combustion
- 2018Experimental and modeling approaches to simulate temperature-gradient induced intradeposit chemical processes with implications for biomass boiler corrosion
- 2017The effect of temperature on the formation of oxide scales regarding commercial superheater steelscitations
- 2017Thermal stabilities and properties of equilibrium phases in the Pt-Te-O systemcitations
- 2017Simultaneous melt and vapor induced ash deposit aging mechanisms – Mathematical model and experimental observationscitations
- 2017The influence of flue gas temperature on lead chloride induced high temperature corrosioncitations
- 2017The Thermodynamics of Slag Forming Inorganic Phases in Biomass Combustion Processescitations
- 2016Thermochemical properties of selected ternary phases in the Ag–Bi–S systemcitations
- 2015Alkali chloride transport within superheater deposits due to temperature gradients
- 2012High temperature corrosion of boiler waterwalls induced by chlorides and bromides. Part 2:Lab-scale corrosion tests and thermodynamic equilibrium modeling of ash and gaseous speciescitations
Places of action
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document
Alkali chloride transport within superheater deposits due to temperature gradients
Abstract
A novel laboratory method was used to study the effects of temperature gradients on synthetic superheater ash-deposits. The set-up includes an air-cooled probe inserted into a hot tube furnace, resulting in a temperature gradient over the deposit. Granular synthetic ash-deposits are applied on exchangeable steel sample rings that are a part of the probe. KCl+K2SO4 and NaCl+Na2SO4 mixtures were studied, chosen to simulate deposits in biomass fired boilers. The cross-sections of the deposits were analyzed using SEM/EDXA.Distinct multilayer morphologies were observed to form in the deposits during experiments. The outer layer of the deposit was sintered and agglomerated. The inner layer of the deposit was observed to remain porous. Within the porous layer, enrichment of pure alkali chloride was observed on the furnace-facing side of the ash particles and on the steel surface. In addition, alkali chloride depletion was observed on the steel-facing side of the particles.The thicknesses of the deposited alkali chloride layers were measured and theoretical gas phase diffusion rates for different alkali chloride species were calculated. The agreement between measurements and calculations support the hypothesis that the alkali chlorides evaporate from hotter particles, diffuse towards the lower temperature and deposit on the colder particles or steel surface. The alkali chlorides are transported due to concentration diffusion, induced by the temperature gradient. Within the deposit, the transport rate increases as a function of temperature. Alkali chloride transport was not observed in temperatures lower than 480 °C after exposure times of 72 h.The results from the laboratory study suggest that temperature gradients can affect the morphology and chemistry of superheater deposits. Depending on the deposit porosity, gas-phase transport can lead to local enrichment of alkali chloride within the deposit, resulting in deposit sintering and increased risk of corrosion.