Binding of SO3 to fly ash components: CaO, MgO, Na2O and K2O

Galloway, Benjamin D.; Sasmaz, Erdem; Padak, Bihter

doi:10.1016/j.fuel.2014.12.046

Cited by 39 publications

(33 citation statements)

References 45 publications

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“…Furthermore, the phase CaSO 4 was identified, as proof of the affinity between Ca and S already observed in the results of the SEM/EDS analysis. The observation of Ca and S together, in the characterization analysis of the ashes, could be proof of the capacity of Ca to react with S, as reported in the literature [41,42], and thus to retain the sulphur compounds in the ashes. detected and quantified with the XRF analysis are reported in Table 4.…”

Section: Lignite Ashsupporting

confidence: 76%

Steam Gasification of Lignite in a Bench-Scale Fluidized-Bed Gasifier Using Olivine as Bed Material

et al. 2020

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The gasification of lignite could be a promising sustainable alternative to combustion, because it causes reduced emissions and allows the production of syngas, which is a versatile gaseous fuel that can be used for cogeneration, Fischer-Tropsch synthesis, or the synthesis of other bio-fuels, such as methanol. For the safe and smooth exploitation of syngas, it is fundamental to have a high quality gas, with a high content of H2 and CO and minimum content of pollutants, such as particulate and tars. In this work, experimental tests on lignite gasification are carried out in a bench-scale fluidized-bed reactor with olivine as bed material, chosen for its catalytic properties that can enhance tar reduction. Some operating parameters were changed throughout the tests, in order to study their influence on the quality of the syngas produced, and pressure fluctuation signals were acquired to evaluate the fluidization quality and diagnose correlated sintering or the agglomeration of bed particles. The effect of temperature and small air injections in the freeboard were investigated and evaluated in terms of the conversion efficiencies, gas composition, and tar produced.

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Section: Lignite Ashsupporting

confidence: 76%

Steam Gasification of Lignite in a Bench-Scale Fluidized-Bed Gasifier Using Olivine as Bed Material

et al. 2020

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“…However, a subsequent study suggested that this might be due to the difference in grain size and porosity of the solid material . A modelling approach called density functional theory (DFT) was applied by Galloway et al . to explore binding mechanisms of SO 3 to other metal compounds.…”

Section: Background For So3 Formation In Combustionmentioning

confidence: 99%

“…Compounds such as CaO, MgO, Na 2 O and K 2 O that are typically found in fly ash were included in the model. The authors observed that SO 3 binds strongly with alkali and alkaline metals, with the effect being more pronounced with alkali metals (i.e., Mg < Ca < Na < K) through the formation of a sulfate (

{SO}_{4}^{2 -}

) . Cao et al .…”

Section: Background For So3 Formation In Combustionmentioning

confidence: 99%

“…94 Similar work on the kinetics of SO 3 adsorption by CaO and MgO was undertaken by Thibault et al 98 However, a subsequent study suggested that this might be due to the difference in grain size and porosity of the solid material. 98 A modelling approach called density functional theory (DFT) was applied by Galloway et al 99 to explore binding mechanisms of SO 3 to other metal compounds. Compounds such as CaO, MgO, Na 2 O and K 2 O that are typically found in fly ash were included in the model.…”

Section: Catalytic Conversion Of So 2 To Somentioning

confidence: 99%

“…The authors observed that SO 3 binds strongly with alkali and alkaline metals, with the effect being more pronounced with alkali metals (i.e., Mg < Ca < Na < K) through the formation of a sulfate (SO 2− 4 ). 99 Cao et al 100 outlined two main interactions of fly ash with SO 3 based on temperature. First, fly ash could serve as an SO 3 adsorbent under low temperatures typical for the bottom section of boilers.…”

Section: Catalytic Conversion Of So 2 To Somentioning

confidence: 99%

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Sulfur trioxide formation/emissions in coal‐fired air‐ and oxy‐fuel combustion processes: a review

et al. 2018

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In oxy‐fuel combustion, fuel is burned using oxygen together with recycled flue gas, which is needed to control the combustion temperature. This leads to higher concentrations of sulfur dioxide and sulfur trioxide in the recycled gas, which can result in the formation of sulfuric acid and enhanced corrosion. Current experimental data on SO3 formation, reaction mechanisms, and mathematical modelling have indicated significant differences in SO3 formation between air‐ and oxy‐fuel combustion for both the wet and dry flue gas recycle options. This paper provides an extensive review of sulfur trioxide formation in air‐ and oxy‐fuel combustion environments, with an emphasis on coal‐fired systems. The first part summarizes recent findings on oxy‐fuel combustion experiments, as they affect sulfur trioxide formation. In the second part, the review focuses on sulfur trioxide formation mechanisms, and the influence of catalysis on sulfur trioxide formation. Finally, the current methods for measuring sulfur trioxide concentration are also reviewed along with the major difficulties associated with those measurements using data available from both bench‐ and pilot‐scale units. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Effect of ash composition on adsorption and agglomeration characteristics in low‐low‐temperature electrostatic precipitator systems

et al. 2021

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The low‐low temperature electrostatic precipitator (LLT‐ESP) has been applied in many power plants to improve the emission performance. In this study, a number of fix‐bed experiments were conducted, which simulated the operation condition of LLT‐ESP. The effect of chemical composition on the adsorption characteristics of ash samples and the agglomeration after adsorption were studied. The results show that the agglomeration of ash particles occurs in three forms, including agglomeration among small particles, adhesion of loose pellets to large particles, and agglomeration among large particles. The capacity of ash particles to adsorb sulphuric acid is less affected by the increase of added amounts of NaCl or KCl. At the same time, the added amount of NaCl or KCl also has little effect on the agglomeration degree of ash particles. The addition of MgO, CaO, Fe2O3, Na2CO3, or K2CO3 from 0% to 13.3%, 22.4%, 23.9%, 18.4%, or 14.2%, promotes the adsorption of sulphuric acid by ash particles from 1.95 mg g−1 to 7.33, 7.71, 6.72, 5.1, or 5.44 mg g−1 (based on sulphur content), respectively, thereby promoting the agglomeration between ash particles. As the addition amount increases, the agglomeration phenomenon among particles becomes more conspicuous. The form of agglomeration changes from agglomeration among small particles to agglomeration among large particles. In addition, the addition of MgO or CaO has great influence on the adsorption and agglomeration.

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Binding of SO3 to fly ash components: CaO, MgO, Na2O and K2O

Cited by 39 publications

References 45 publications

Steam Gasification of Lignite in a Bench-Scale Fluidized-Bed Gasifier Using Olivine as Bed Material

Steam Gasification of Lignite in a Bench-Scale Fluidized-Bed Gasifier Using Olivine as Bed Material

Sulfur trioxide formation/emissions in coal‐fired air‐ and oxy‐fuel combustion processes: a review

Effect of ash composition on adsorption and agglomeration characteristics in low‐low‐temperature electrostatic precipitator systems

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