Experimental study on combined valorization of bituminous coal derived fluidized bed fly ash and carbon dioxide from energy sector

Zdeb, Janusz; Howaniec, Natalia; Smoliński, Adam

doi:10.1016/j.energy.2022.126367

Cited by 6 publications

(6 citation statements)

References 41 publications

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“…Fluidized bed fly ash samples supplied by TAURON Wytwarzanie S.A., the leading power provider in Poland (denoted 1–4 in Table 1 ), carbon dioxide gas grade of 99.99% and tap water were used in the direct dry carbonation method adopted for the conversion of fluidized bed fly ash to a stable and more environmentally friendly carbonated form [ 33 ] (denoted 1C–4C, respectively), being the main solid-state component of the filling mixtures tested. The bottom ash, provided also by TAURON Wytwarzanie S.A. and sieved to a grain size below 2 mm, cement of the strength class 42.5, as well as a commercially available mineral mining binder (denoted 5–7, respectively) were applied as solid additives in the preparation of the selected filling mixtures tested.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, it makes use of carbon dioxide, reducing its emission. In this way, the process combines utilization and valorization of two considerable energy-sector-derived waste streams [ 31 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the works on fly ash carbonation have been reported to use the complex and energy-demanding, two-stage indirect wet method [ 17 , 18 , 24 , 25 , 26 , 29 , 34 ] and some use the dry method with increased pressure and temperature, as well as optional steam dosing [ 21 , 22 , 23 , 27 , 30 , 35 , 36 ]. Reports on the dry carbonation method employed at ambient conditions are limited in their number, the scale of experiments and the parameters tested [ 27 ], with some recent exceptions in these terms [ 31 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

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Utilization of Carbon Dioxide and Fluidized Bed Fly Ash in Post-Industrial Land Remediation

et al. 2023

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The utilization of carbon dioxide and combustion products in cost- and energy-efficient technologies is an important element of creating sustainable energy systems, particularly in the transition period towards carbon neutrality and in light of the latest political developments, when solid fuels are still competing for a dominant role in securing energy supplies. Within the study presented, bituminous coal-derived fluidized bed fly ash samples of high calcium content, treated using a dry carbonation method under ambient conditions, were tested in terms of their specific properties to determine their usability in the preparation of injection mixtures for the filling of voids after shallow mining activities and other selected geo-engineering techniques. The study goes beyond the existing literature in terms of the carbonation method used, alkaline earth metal source, scale of the experiment, process conditions employed and product application studied. The results showed that the bituminous coal-derived fluidized bed fly ash, carbonated using the direct method adopted, may be successfully employed as the main solid component (over 82% w/w) of the injection mixtures for filling voids after shallow mining activities. The achievable compressive strength of a few MPa makes these materials applicable also in terms of ground strengthening in case it is required in light of the expected land development options to be employed. All principal materials used in the injection mixtures developed (carbonated fluidized bed fly ash, carbon dioxide, bottom ash) are industrial waste, and the carbonation method employed is simple and performed under ambient conditions, which reduces the required energy and cost input of filling mixture production, avoids the surface waste storage requirements, and contributes to the development of low energy-intensive carbon dioxide utilization and solid waste valorization methods.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Utilization of Carbon Dioxide and Fluidized Bed Fly Ash in Post-Industrial Land Remediation

et al. 2023

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“…The axial intake method is sometimes used in airflow powder mixers, which results in the radial mixing strength of particles being weaker than the axial mixing strength. [16][17][18] This is because the horizontal velocity of particles is smaller than the vertical velocity. The problem of inadequate lateral mixing of solids and gas-solids in contact in shallow fluidized beds can be overcome in many ways.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the mixing characteristics in an air swirling fluidized bed with monodisperse and multi‐sized particles

et al. 2023

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Powder mixers are used in many industries. In the present work, a new type of air swirling mixer was designed and optimized with eight horizontally arranged inlet pipes at the tangential inlet angle of 35°. The mixing of multi‐sized spherical particles (2.0, 3.0, 4.0, and 5.0 mm) was numerically investigated in the air swirling mixer by coupled computational fluid dynamics–discrete element method. The numerical results showed that multi‐sized particles achieved comparable mixing performance to monodisperse particles. The Lacey index for multi‐sized particles increased initially, and then reached a maximum value at 0.824. The upward velocity of the particles, , increased initially, and then decreased to zero along the bed height. The maximum value of occurred at a height of 40 mm. Particle radial velocity was larger near the wall than at the mixer tube centre area. The smallest particles aggregated in three layers. The collision number of the particles reached a maximum at bed height of 120 mm, which was consistent with the position of the maximum stress of the particles against the tube wall.

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“…As one of the typical alkaline industrial wastes, FA contains a large amount of calcium oxide (CaO), indicating that FA could capture CO 2 with the purpose of 'using waste to treat waste'. According to the available documents, direct carbonation of FA with CO 2 during the gas/solid reactions could achieve transient mass transfer of CO 2 and partial immobilization of HMs [8][9][10]. It is difficult, however, to control the carbonation ratio under conditions of high pressure and high temperature [11,12].…”

Section: Introductionmentioning

confidence: 99%

Remediation of Micro-Pollution in an Alkaline Washing Solution of Fly Ash Using Simulated Exhaust Gas: Parameters and Mechanism

Wang

Tang

et al. 2023

Sustainability

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Currently, there is an urgent need to remediate heavy metals (HMs) and high alkalinity in the washing solution of fly ash (FA). This study investigated the remediation with simulated exhaust gases of two CO2 partial pressure and revealed the removal efficiency of target pollutants, mainly including Pb ions. The results verify that under the preferred conditions of 25 °C and 15 mL/min flow rate, bubbling two kinds of simulated flue gases could efficiently remove 97.9–99.2% of Pb ions. Moreover, the initial 40 min removal of Pb ions fits in a way with a pseudo-first-order equation. Based on the thermodynamic parameters, we infer that the removal of Pb ions was a spontaneous, exothermic, and entropy-decreasing process. Furthermore, residual HMs and terminal pH after remediation of the FA washing solution basically met the regulatory threshold values of the integrated wastewater discharge standard in China (GB 8978−1996). Additionally, the particles obtained from the washing solution of FA were identified as CaCO3, which was mainly composed of vaterite and calcite crystalline. This study provides a fundamental guide for remediating multiple pollutants in the washing solution of FA and simultaneously sequestrating carbon emissions from power plants and industries.

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Experimental study on combined valorization of bituminous coal derived fluidized bed fly ash and carbon dioxide from energy sector

Cited by 6 publications

References 41 publications

Utilization of Carbon Dioxide and Fluidized Bed Fly Ash in Post-Industrial Land Remediation

Utilization of Carbon Dioxide and Fluidized Bed Fly Ash in Post-Industrial Land Remediation

Numerical study of the mixing characteristics in an air swirling fluidized bed with monodisperse and multi‐sized particles

Remediation of Micro-Pollution in an Alkaline Washing Solution of Fly Ash Using Simulated Exhaust Gas: Parameters and Mechanism

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