Chemical study of fly ash deposition in combustion of pelletized residual agricultural biomass

Royo, Javier; Canalís, Paula; Quintana, David

doi:10.1016/j.fuel.2020.117228

Cited by 23 publications

(8 citation statements)

References 63 publications

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“…All these minerals agree with those reported by Vassilev et al, 43 who gathered in a review article the chemical composition and mineral classification of biomass ash. Furthermore, similar results were also found in the studies of Maresca et al 44 Royo et al 45 reported the strong presence of quartz and other alkali metal (Na) and alkaline earth (Ca, Mg) silicates in the bottom ash. This fact may be due to the presence of sand or soil particles that may have been harvested along with the forest biomass or due to decomposition in the burning of silicon-containing minerals from the plant tissue.…”

Section: Resultssupporting

confidence: 84%

“…Royo et al 45 . reported the strong presence of quartz and other alkali metal (Na) and alkaline earth (Ca, Mg) silicates in the bottom ash.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of calcium minerals (calcite and portlandite) results from the high level of calcium in the woody biomass. 46 Royo et al 45 stated that the alkaline earth metals calcium and magnesium are the most numerous in bottom ash from woody materials. They can appear in the form of carbonates, such as calcite.…”

Section: Resultsmentioning

confidence: 99%

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Valorization of biomass ash for the effective removal of dipyrone from water: an efficient and low‐cost option

Oliveira

Reck

Resende

et al. 2023

J of Chemical Tech & Biotech

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Background: In order to propose a destination for the bottom ash generated from biomass burning, its morphology, functional groups and mineral phases were studied. Dipyrone has been extensively used as an antipyretic, increased due to cases of COVID-19, and due to excretion by urine, incorrect disposal and industrial effluents has been destined to wastewater, being harmful to human and animal life. The present study proposes using biomass ash for the adsorption of dipyrone.Results: The characterization of biomass ash shows a sufficient surface area size for adsorption, and a mainly amorphous structure with some peaks of quartz, calcite and other mineral phases. The results show that the kinetic model which best describes the adsorption is the pseudo-first-order model. The Langmuir model best fits at 25 °C, and the Freundlich model best describes the adsorption at 35 and 45 °C. The thermodynamic parameters indicated that the process is endothermic with a maximum adsorptive capacity of 65.27 mg g −1 . In addition, the adsorption is spontaneous, disordered and chemical. The ionic strength study reveals that the adsorbent is promising for real effluent treatment and there is evidence that electrostatic interaction is not the primary adsorptive mechanism, agreeing with the result obtained from pH testing. The proposed mechanism for dipyrone removal involves hydrogen bonds, π bonds and electron donor-acceptor complex.Conclusions: The results are promising in comparison with recent literature and solve two environmental problems: biomass bottom ash disposal and pharmaceutical removal in aqueous medium. The ash may be regarded as a low-cost and environmentally friendly adsorbent.

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Section: Resultssupporting

confidence: 84%

“…Royo et al 45 . reported the strong presence of quartz and other alkali metal (Na) and alkaline earth (Ca, Mg) silicates in the bottom ash.…”

Section: Resultsmentioning

confidence: 99%

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Valorization of biomass ash for the effective removal of dipyrone from water: an efficient and low‐cost option

Oliveira

Reck

Resende

et al. 2023

J of Chemical Tech & Biotech

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“…Both kaolin and bituminous coal ash contain a large amount of silicon and aluminum, showing good potassium capture characteristics. In the study of ash deposition, Royo et al 29 used a fixed grate reactor to test the deposition rate, bottom ash ratio, and sintering degree during biomass combustion and characterized the fly ash deposits collected during the test. The results showed that the higher excess air ratio, the less condensation.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Coal Fly Ash Blending Ratio on Biomass Slagging Structure Modification and Alkali Metal Migration

Yang

Wang

et al. 2023

Energy Fuels

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The analysis of ash deposition samples by electron microscopy (EM), scanning electron microscopy (SEM)/energy dispersive scanning (EDS), and X-ray diffraction (XRD) was carried out at three sampling points of a one-dimensional furnace (sampling temperatures were T L5 = 960 °C, T L6 = 855 °C, and T L7 = 820 °C, respectively). The improvement of ash deposition characteristics of biomass combustion with the different addition ratios of coal fly ash (CFA) (M r = 1:1, 1.5:1 or 2:1) and the heterogeneous removal of gas phase alkali metal heterogeneous were studied. The results showed that under the condition of M r = 1:1, the ash sample presented a three-dimensional porous loose structure like "coral reef" with the rice husk ash as the skeleton and the combustion products of CFA as the bonding point. The spherical and filamentous crystals mainly composed of SiO 2 , Al 2 O 3 , and silicates were distributed in the slag, and the surfaces of these crystals were accompanied by the eutectic composite salt of K−Al−Si with a high melting point, reflecting the heterogeneous curing effect of CFA on the gas phase migration of the alkali metal (K). With the decreasing addition ratio of CFA (M r = 1.5:1 or 2:1), the spherical and filamentous crystals were increased in the slag. MgO, Fe 2 O 3 , and Al 2 O 3 may be involved in the formation of high-temperature refractory Mg-Fealuminate, Ca-and Mg-silicate, which were the precursors of the rigid slag. The alkali metals mostly presented in the form of K 2 O and KCl in the gas−solid conversion under the temperature effect, serving as binders for bridging, agglomeration, and slagging of the above precursors. In addition, the kalium enrichment was accompanied by Al and S in the CFA, indicating that the Al-and S-active sites have obvious adsorption to kalium.

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“…Empirically derived indices are widely used to predict the ash behavior of coal but showed significant limitations in the case of biomass [24,[32][33][34]. This might be due to the abundant iron and alumina-silicate ash contents in coal compared to the high calcium and alkali-silicates in biomass [24,32].…”

Section: Introductionmentioning

confidence: 99%

Will mixing rule or chemical reactions dominate the ash behavior of biomass mixtures in combustion processes on laboratory and pilot scales?

Atallah

Defoort²,

Campargue³

et al. 2022

Fuel

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Chemical study of fly ash deposition in combustion of pelletized residual agricultural biomass

Cited by 23 publications

References 63 publications

Valorization of biomass ash for the effective removal of dipyrone from water: an efficient and low‐cost option

Valorization of biomass ash for the effective removal of dipyrone from water: an efficient and low‐cost option

Effect of the Coal Fly Ash Blending Ratio on Biomass Slagging Structure Modification and Alkali Metal Migration

Will mixing rule or chemical reactions dominate the ash behavior of biomass mixtures in combustion processes on laboratory and pilot scales?

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