Investigation of the friability of Ca looping sorbents during and after hydration based reactivation

Materić, Vlatko; Hyland, Margaret; Jones, Mark I.; Holt, Robert

doi:10.1016/j.fuel.2013.09.061

Cited by 17 publications

(23 citation statements)

References 30 publications

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“…The partial hydration of limestone is proposed as an acceptable strategy in order to decrease both negative impact on the mechanical strength of reactivated material and steam consumption. In addition, pelletization can be another alternative to improve the mechanical strength of sorbents [95,107,108].…”

Section: Hydrationmentioning

confidence: 99%

High temperature CO2 sorbents and their application for hydrogen production by sorption enhanced steam reforming process

Yancheshmeh

Radfarnia

Iliuta

2016

Chemical Engineering Journal

285

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Section: Hydrationmentioning

confidence: 99%

High temperature CO2 sorbents and their application for hydrogen production by sorption enhanced steam reforming process

Yancheshmeh

Radfarnia

Iliuta

2016

Chemical Engineering Journal

285

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“…Under these conditions, the Ca(OH) 2 was presumed to be in the 'superheated state' . Further research by Blamey et al 24 and Materic et al 25 indicated that the strength of hydrated limestone was enhanced after superheating. If the superheating treatment is also effective for hydrated synthetic pellets, then an approach combining steam hydration and superheating treatment seems potentially interesting for reactivating spent pellets.…”

Section: Introductionmentioning

confidence: 98%

“…Further research by Blamey et al . and Materic et al . indicated that the strength of hydrated limestone was enhanced after superheating.…”

Section: Introductionmentioning

confidence: 99%

Effect of steam hydration on reactivity and strength of cement‐supported calcium sorbents for CO₂ capture

Duan

et al. 2017

Greenhouse Gases

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Steam hydration was used to reactivate spent cement‐supported CO2 sorbent pellets for recycle. The effect of steam hydration on the reactivity of sorbents was investigated in a bubbling fluidized reactor. A specially designed impact apparatus was developed to evaluate the strength of the reactivated pellets as well as determine the effect of ‘superheating’. It was found that the reactivity of synthetic pellets was elevated significantly over that of raw limestone after steam hydration. The CaO conversion of spent pellets increased from 0.113 to 0.419 after hydration, whereas that of spent limestone ranged from 0.089 to 0.278. The CaO conversions of hydrated samples calcined under different conditions achieved the identical level, proportional to the degree of hydration. As expected, the mechanical strength of synthetic pellets declined severely after reactivation. Large cracks emerged on hydrated limestone as seen in scanning electron microscope images. By contrast, similar cracks were not observed for synthetic pellets after hydration, although hydration did produce higher porosity than seen with limestone and an increased surface area, which enhanced CO2 capacity and was associated with an increase in strength loss. The breakage rate of superheated, steam‐reactivated limestone‐derived pellets was about half that of hydrated samples. This demonstrates that superheating treatment (which allows the annealing of stacking faults and mechanical strain produced by hydration) could enhance the strength of hydrated pellets. This work demonstrated that combining steam hydration with superheating can both reactivate the spent synthetic pellets and reduce strength decay associated with the hydration process. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…Firstly, all the natural sorbents will face a severe problem of loss-in-capacity due to sintering at a high temperature [11,12]. Another problem is attrition and fragmentation of sorbents due to its cyclic operation in fluidized bed systems [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Pore-Formers to Modify Extrusion-Spheronized CaO-Based Pellets for CO2 Capture

Zhang

et al. 2019

Processes

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The application of circulating fluidized bed technology in calcium looping (CaL) requires that CaO-based sorbents should be manufactured in the form of spherical pellets. However, the pelletization of powdered sorbents is always hampered by the problem that the mechanical strength of sorbents is improved at the cost of loss in CO2 sorption performance. To promote both the CO2 sorption and anti-attrition performance, in this work, four kinds of pore-forming materials were screened and utilized to prepare sorbent pellets via the extrusion-spheronization process. In addition, impacts of the additional content of pore-forming material and their particle sizes were also investigated comprehensively. It was found that the addition of 5 wt.% polyethylene possesses the highest CO2 capture capacity (0.155 g-CO2/g-sorbent in the 25th cycle) and mechanical performance of 4.0 N after high-temperature calcination, which were about 14% higher and 25% improved, compared to pure calcium hydrate pellets. The smaller particle size of pore-forming material was observed to lead to a better performance in CO2 sorption, while for mechanical performance, there was an optimal size for the pore-former used.

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Investigation of the friability of Ca looping sorbents during and after hydration based reactivation

Cited by 17 publications

References 30 publications

High temperature CO2 sorbents and their application for hydrogen production by sorption enhanced steam reforming process

High temperature CO2 sorbents and their application for hydrogen production by sorption enhanced steam reforming process

Effect of steam hydration on reactivity and strength of cement‐supported calcium sorbents for CO₂ capture

Investigation of Pore-Formers to Modify Extrusion-Spheronized CaO-Based Pellets for CO2 Capture

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Investigation of the friability of Ca looping sorbents during and after hydration based reactivation

Cited by 17 publications

References 30 publications

High temperature CO2 sorbents and their application for hydrogen production by sorption enhanced steam reforming process

High temperature CO2 sorbents and their application for hydrogen production by sorption enhanced steam reforming process

Effect of steam hydration on reactivity and strength of cement‐supported calcium sorbents for CO2 capture

Investigation of Pore-Formers to Modify Extrusion-Spheronized CaO-Based Pellets for CO2 Capture

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Effect of steam hydration on reactivity and strength of cement‐supported calcium sorbents for CO₂ capture