Fluidized bed combustion coal fly ash: comparative evaluation for potential use in alkali-activated binders

Wu, Wenda; Matalkah, Faris; Darsanasiri, A.G.N.D.; Soroushian, Parviz

doi:10.1080/19392699.2019.1576647

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…The geopolymers give plenty of potential utilization options for FBC fly ash. The attributes and potential application for FBC coal fly ash in geopolymer was investigated and described precisely by Wu et al [11]. During this study, two different types of FBC fly ash were examined and compared with conventional fly ash.…”

Section: Ricon19 -Remine International Conferencementioning

confidence: 97%

“…Tests have shown that the conventional fly ash based geopolymer obtains almost two times higher compressive strength than the FBC fly ash based one. The main possible reasons for this disproportion were: the finer particles, the lower crystallinity and the higher Al and Si content of conventional fly ash [11]. Studies done by Oyun-Erdene et al confirm that mechanical activation of FBC fly ash improves significantly the strength of the FBC fly ash based geopolymer [12].…”

Section: Ricon19 -Remine International Conferencementioning

confidence: 99%

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Development of the Strength of the Fluidized Bed Combustion Fly Ash Based Geopolymer in Time

Paszek

Górski

2020

KEG

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ThispaperpresentsastudyintothemechanicalbehaviourofFluidizedBedCombustion (FBC)fly ash-based geopolymer.FBCflyashisaby-product of a burning of a solid fuel (hard coal in case of this study) in a furnace at a low temperature. FBC fly ash is a type of a waste which is more difficult to recycle than pulverized fly ash.UsingFBCflyashin geopolymers offers one possible way to recycle it. The main goals of the investigation were to determine the influence of curing temperature and curing conditions on the strength of FBC fly ash-based geopolymer; to determine the changes of strength over time and the changes of the temperature inside the geopolymer during the curing process. Tests have shown that the strength of the geopolymer generally increases in line with the increase of a curing temperature. The compressive strength stabilizes after 5 days of curing and yet continues to gain extra strength over the longer term. Theflexuralbehaviourisnotmonotonicandthereforehardtopredict.The temperature inside the geopolymer rises rapidly until reaching around 27.5°C and then decreases steadily. Keywords: geopolymer, Fluidized Bed Combustion Fly ash, temperature, strength

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Section: Ricon19 -Remine International Conferencementioning

confidence: 97%

Section: Ricon19 -Remine International Conferencementioning

confidence: 99%

Development of the Strength of the Fluidized Bed Combustion Fly Ash Based Geopolymer in Time

Paszek

Górski

2020

KEG

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“…Its diffraction peaks stand out in the XRD patterns of all types of coal fly ash. Since PCC boilers operate at temperatures above 1400°C, high enough for mullite crystallization, its fly ash often contains mullite (3Al 2 O 3 .2SiO 2 ) [ 54 , 55 ]. The mineral composition of mullite is heterogeneous due to the substitution of impurities at the aluminum sites, forming solid solutions.…”

Section: Properties Of Coal-fired Power Plant Fly Ashmentioning

confidence: 99%

“…FBC boilers operate at approximately 850°C, which is not high enough for mullite formation; thus, no diffraction peaks of mullite can be observed. Instead, hematite, phengite and anhydrite gehlenite might be present in the XRD patterns of FBC fly ash [ 4 , 55 , 57 ]. Figure 3 presents the XRD patterns of four types of fly ash.…”

Section: Properties Of Coal-fired Power Plant Fly Ashmentioning

confidence: 99%

“…Thermal analysis of fly ash confirms the presence of UC with a large exothermic peak incorporated with weight loss. The starting point of UC combustion in TG-DTA analysis varies with the type of coal fly ash [ 55 , 59 , 60 ]. Typically, the amount of UC in fly ash is higher than that in bottom ash [ 61 ].…”

Section: Properties Of Coal-fired Power Plant Fly Ashmentioning

confidence: 99%

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Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Minh

Pham

Tung

et al. 2023

Journal of Analytical Methods in Chemistry

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Coal-fired power plant fly ash is a global environmental concern due to its small particle size, heavy metal content, and increased emissions. Although widely used in concrete, geopolymer, and fly ash brick production, a large amount of fly ash remains in storage sites or is used in landfills due to inadequate raw material quality, resulting in a waste of a recoverable resource. Therefore, the ongoing need is to develop new methods for recycling fly ash. The present review differentiates the physiochemical properties of fly ash from two coal combustion processes: fluidized bed combustion and pulverized coal combustion. It then discusses applications that can consume fly ash without strict chemical requirements, focusing on firing-associated methods. Finally, the challenges and opportunities of fly ash recycling are discussed.

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Size fraction characterisation of highly-calcareous and siliceous fly ashes

Delihowski,

Izak,

Wójcik

et al. 2024

J Therm Anal Calorim

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The properties of coal fly ash vary significantly depending on factors such as coal type, combustion conditions, and flue gas emission reduction methods. This study investigates the influence of particle size fractionation on the chemical composition, mineralogical structure, and thermal behaviour of two types of fly ash: high calcium ash derived from lignite (S1) and silica-rich ash from bituminous coal (S2). Dry aerodynamic separation was used to obtain distinct size fractions, which were then subjected to a comprehensive characterisation including X-ray fluorescence, X-ray diffraction, scanning electron microscopy, and thermal analysis. The results reveal notable differences between the S1 and S2 ashes and between their size fractions. The finer fractions (< 20 μm) of S1 showed an increased calcium and sulphur content, while the coarser fractions (> 100 μm) contained more silica and alumina. The S2 ash exhibited a higher overall silica content, with alkali metals concentrated in finer fractions. Thermal analysis demonstrated distinct behaviours for each type and fraction of ash. Fine fractions of S1 ash showed SO2 emission at elevated temperatures, while S2 ash exhibited greater CO2 gas emission. After thermal treatment, the recrystallisation of the glassy phase was observed for S1, while the S2 ashes were more prone to melting and agglomeration. The study highlights the potential for the customised utilisation of specific ash fractions in various applications, such as geopolymer synthesis, adsorbent materials, and refractory products. This comprehensive characterisation contributes to a better understanding of fly ash properties and their dependence on particle size, providing valuable insights to optimise fly ash utilisation in various industries. The findings suggest strategies for a more efficient use of fly ash resources, particularly relevant in the context of decreasing fly ash availability due to the phase-out of coal power plants.

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Fluidized bed combustion coal fly ash: comparative evaluation for potential use in alkali-activated binders

Cited by 9 publications

References 33 publications

Development of the Strength of the Fluidized Bed Combustion Fly Ash Based Geopolymer in Time

Development of the Strength of the Fluidized Bed Combustion Fly Ash Based Geopolymer in Time

Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Size fraction characterisation of highly-calcareous and siliceous fly ashes

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