Study on the possibilities of treatment of combustion by-products from fluidized bed boilers into a product devoid of free calcium oxide

Łączny, Marian; Iwaszenko, Sebastian; Gogola, Krzysztof; Bajerski, Andrzej; Janoszek, Tomasz; Klupa, Agnieszka; Cempa-Balewicz, Magdalena

doi:10.1016/j.jsm.2015.12.002

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…Calcium oxide, due to its sorption properties, reduces the moisture content, and also the SO 2 emissions in the flue gas during the combustion process. Lime and coal granulate have good mechanical toughness and energy efficiency [37,38]. Figure 3 shows a schematic of the fine coal processing using a disk granulator with a diameter of 1.5 m at a speed of 15-20 rpm and a plate angle of 40-45°.…”

Section: Production Of Solid Fuel From the Fine Coalmentioning

confidence: 99%

Using Agglomeration Techniques for Coal and Ash Waste Management in the Circular Economy

Borowski¹,

Alsaqoor²,

Alahmer³

2021

Adv. Sci. Technol. Res. J.

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This is a scoping review of agglomeration techniques to obtain of solid bodies from particle waste-materials for their utilization. For this purpose, the granulation and briquetting of fine coal and fly ash were presented in detail. Many successful works on solid fuels production, with coal only, and also with the addition of biomass, were presented. During the solid fuel combustion in power boilers, significant amounts of ash are generated. The properties of fly ashes were taken into consideration, and different methods of their utilization were proposed to obtain a wide range of useful products. Consequently, the waste resources of coal and ash were fully utilized. In final remarks, it was concluded, that the agglomeration techniques play an important role in waste management, but particularly in the circular economy.

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Section: Production Of Solid Fuel From the Fine Coalmentioning

confidence: 99%

Using Agglomeration Techniques for Coal and Ash Waste Management in the Circular Economy

Borowski¹,

Alsaqoor²,

Alahmer³

2021

Adv. Sci. Technol. Res. J.

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“…The mechanisms of the reactions are thoroughly discussed in previous researche [ 26 , 27 , 28 ]. Łączny suggested a new approach to the carbonation process [ 29 ]. In his study, the process of carbonation was used to achieve a product with a controlled content of free CaO.…”

Section: Introductionmentioning

confidence: 99%

Process Kinetics of the Carbonation of Fly Ashes: A Research Study

2021

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The aim of the paper is to present the results of research on the carbonation process kinetics of coal combustion ashes originating from fluidized bed boilers used in power plants. Based on the thermogravimetric analysis (TGA), the hypothesis that carbon dioxide is bounded by the mineral substances (calcium compounds) in the fly ashes was confirmed. Determining the kinetic parameters of the carbonation of fly ashes requires simultaneously taking into consideration the kinetics of the drying process of the sample. The drying process of the sample masks the effect of the reaction of CO2 with calcium compound. Unlike the ashes generated in pulverized fuel boilers, fly ashes contain irregular amorphic mineral components or poorly crystalized products of complete or partial dehydroxylation of claystone substance present in shale formations constituting the gangue as well as anhydrite (CaSO4), a desulfurization product. The content of free calcium oxide (CaO) in such ashes ranges from a few to several percent, which is a significant obstacle considering their use in cement and concrete production as type II admixtures understood to be inorganic grained materials of pozzolanic or latent hydraulic properties. The paper presents effective mechanisms which reduce the content of free CaO in ashes from Fluidized Bed Combustion (FBC) boilers to a level that allows their commercial utilization in the cement industry.

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“…Rotating drum reactors have proven to overcome the limitations of fixed bed setups in the carbonation of alkaline waste materials. The continuous mixing of the solid in rotating drum reactors substantially increases the level and the reaction speed of alkaline waste carbonation (Brück et al 2018;dos Reis et al 2020;Łączny et al 2015;Lombardi et al 2016). Reactor hold-up, residence time and, thus, capacity can be controlled by rotation and mass flow rate using a proportionality between rotationnormalized flow rate and reactor hold-up (Schnabel et al 2021a).…”

Section: Introductionmentioning

confidence: 99%

Transferring the Carbonation of Biomass Bottom Ash from Batch to Continuous Operation

Schnabel¹,

Brück²,

Pohl³

et al.

Global NEST International Conference on Environmental Science &Amp; Technology

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Biomass incineration residues may be used for CO2 capture and storage by carbonation of waste-borne metal hydroxides. Moist carbonation of these ashes can be performed under mild conditions (ambient pressure and temperature) and accelerated by using a CO2-rich gas. The process requires the wetting of the typically dry-discharged ashes and highly depends on the moisture content. Handling of the moist ashes in continuously operated reactors is challenging, especially due to build-up of incrustations. In this study, the carbonation of biomass bottom ash was performed in fixed-bed and rotating drum reactors. Wetting was performed either manually prior to fixed-bed carbonation or with spray-nozzles. The moisture dependent CO2 uptake was evaluated by a gas balance. Results show that the CO2 uptake in the fixed-bed and rotating drum was consistently between 20 and 35 g/kg, although the CO2 concentration in the rotating drum was significantly lower (10 vol% vs. 100 vol%). In the fixed bed, the uptake strongly depended on the moisture content, while in the rotating drum the effect was less pronounced. Application of such rotating drums allows for a continuous solids feed while combining wetting and carbonation.

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Study on the possibilities of treatment of combustion by-products from fluidized bed boilers into a product devoid of free calcium oxide

Cited by 10 publications

References 4 publications

Using Agglomeration Techniques for Coal and Ash Waste Management in the Circular Economy

Using Agglomeration Techniques for Coal and Ash Waste Management in the Circular Economy

Process Kinetics of the Carbonation of Fly Ashes: A Research Study

Transferring the Carbonation of Biomass Bottom Ash from Batch to Continuous Operation

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