Experimental Studies on Hydration of Partially Sulphated CFBC Ash

Wu, Yinghai; Anthony, Edward J.; Jia, Lei

doi:10.1002/cjce.5450810609

Cited by 24 publications

(14 citation statements)

References 10 publications

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“…2 show that the diffraction peaks of lime cannot be found after hydration for 6 h, and most of the lime in F0 is slaked at 1 h. The reason is that lime formed at about 800-900°C is highly reactive and can hydrate to Ca(OH) 2 in several hours [2,[29][30][31][32].…”

Section: Hydration Productsmentioning

confidence: 99%

Investigation on the hydration of CFBC fly ash

Sheng

Zhai

2012

Fuel

107

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Section: Hydration Productsmentioning

confidence: 99%

Investigation on the hydration of CFBC fly ash

Sheng

Zhai

2012

Fuel

107

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“…However, fly ash sample C significantly differs in SiO 2 , Na 2 O, and Cl – content. Additionally, the CaO contents, where CaO exists freely or as part of compounds such as silicates, aluminates, sulfates, and carbonates, , varies between 25 and 32.3 mass percent.…”

Section: Resultsmentioning

confidence: 99%

Fly Ash from Municipal Solid Waste Incineration as a Potential Thermochemical Energy Storage Material

et al. 2019

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Each year, combustion at municipal solid waste incineration (MSWI) plants produces millions of tons of fly ash globally. This ash is characterized as a hazardous material and is mostly placed in landfills after a stabilization process or stored in hazardous waste sites. Thus, disposal of fly ash leaves a considerable social and environmental footprint and leads to high waste management costs. Thermochemical energy storage (TCES) systems are considered to be outstanding because of their high-energy density and near-zero energy loss over long periods of time. Calcium oxide (CaO), a main MSWI fly ash component, is a promising candidate for TCES. In this study, we investigate the potential of fly ash as a TCES material. To do so, we analyzed representative samples from different MSWIs using simultaneous thermal analysis (STA) under N2, CO2, and CO2/H2O atmospheres. These analyses were supported by additional techniques such as X-ray fluorescence (XRF) spectroscopy, inductively coupled plasma-optical emission spectroscopy (ICP-OES), and scanning electron microscopy (SEM). The STA results illustrate fly ash reactivity under different atmospheres. All samples could store heat through endothermic reactions and one sample was able to release stored heat under selected operating conditions. XRF analysis verified an average fly ash composition of 27% CaO, ICP-OES analysis demonstrated the presence of different heavy metals, and SEM analysis revealed the sintering and agglomeration of fly ash particles at high temperatures (1150 °C). This study shows that the use of fly ash as a TCES material is promising and that further investigation in the field is needed to corroborate this application.

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“…To avoid this undesirable phenomenon, sorbent reactivation technologies should be carried out under strictly controlled conditions [18]. Pelletization consists of combining the above methods, extending the residence time of the reactive material and obtaining high porosity (macropores), which improves the contact of SO 2 with CaO grains, which leads to a high degree of calcium utilization [15,18]. The study in [16] presents an analysis of the possibility of pelleting mixtures of wet ash mass together with fuel, sorbent, or other solid materials (e.g., fly ash or incinerated waste).…”

Section: Chemical Processingmentioning

confidence: 99%

“…Implementation of Directive 2001/80/EC resulted in the need to reduce the emis-Table 2. Methods of improving the reactivity of calcium sorbents [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process

Wichliński

Włodarczyk

2021

Minerals

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The paper describes the possibilities of simple and effective modification of calcium sorbents used for flue gas desulfurization with a size between of 125–250 µm. The additives to the sorbents in the amount of 0.5% and 1.0% were inorganic sodium and lithium compounds. The research on the reactivity of sorbents was analyzed in the process of simultaneous calcination and sulfation at the temperature of 850 °C. The type of Na+ or Li+ cations and the inorganic salt anions have an influence on the modification of calcium sorbents in order to improve the efficiency of the calcination and sulfation process. Modification of calcium sorbents by adding inorganic sodium and lithium compounds, regardless of the amount, changes the reactivity coefficient RI [mol/mol] and the absolute sorption coefficient CI [g S/kg sorbent]. In the case of inorganic sodium salt (Additive 1), regardless of the amount of modifier added, there was a visible improvement in the reactivity of the sorbent: 1.0% of the additive caused an increase in the RI coefficient in relation to the raw sorbent by over 14%, and in the case of the CI coefficient by over 24%. Additional research was the analysis of the limestone behavior mechanism during the simultaneous calcination and sulfation (SCS) process under conditions of elevated temperature and with variable CO2 and O2 contents in the flue gas. The behavior of sorbents with a size distribution of 125–250 µm was assessed on the basis of the change in mass of the samples by determining the reactivity coefficient RI, [mol/mol] and the absolute sorption coefficient CI, [g S/kg sorbent]. Using the mercury porosimetry technique, the change in sorbent porosity in the subsequent stages of the simultaneous calcination and sulfation process was investigated. The process was carried out in the temperature range corresponding to the oxy-combustion (i.e., from 850 °C to 1000 °C).

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Experimental Studies on Hydration of Partially Sulphated CFBC Ash

Cited by 24 publications

References 10 publications

Investigation on the hydration of CFBC fly ash

Investigation on the hydration of CFBC fly ash

Fly Ash from Municipal Solid Waste Incineration as a Potential Thermochemical Energy Storage Material

Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process

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