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

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dc.contributor.authorYu, Zhijian
dc.contributor.authorDuan, Lunbo
dc.contributor.authorSu, Chenglin
dc.contributor.authorLi, Yingjie
dc.contributor.authorAnthony, Edward J.
dc.date.accessioned2017-07-20T11:08:41Z
dc.date.available2017-07-20T11:08:41Z
dc.date.issued2017-05-23
dc.description.abstractSteam hydration was used to reactivate spent cement-supported CO2 sorbent pellets for recycle and the effect of steam hydration on the reactivity of sorbents was investigated in a bubbling fluidised 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 significantly elevated 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) enhances 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.en_UK
dc.identifier.citationYu Z, Duan L, Su C, Li Y, Anthony EJ, Effect of steam hydration on reactivity and strength of cement-supported calcium sorbents for CO2 capture, Greenhouse Gases: Science and Technology, Vol. 7, Issue 5, October 2017, pp. 915-926en_UK
dc.identifier.issn2152-3878
dc.identifier.urihttp://dx.doi.org/10.1002/ghg.1690
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/12219
dc.language.isoenen_UK
dc.publisherWileyen_UK
dc.rightsAttribution-NonCommercial 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectCalcium sorbenten_UK
dc.subjectCement supporten_UK
dc.subjectCalcination/carbonation cycleen_UK
dc.subjectSteam hydrationen_UK
dc.subjectMechanical strengthen_UK
dc.subjectSuperheating treatmenten_UK
dc.titleEffect of steam hydration on reactivity and strength of cement-supported calcium sorbents for CO2 captureen_UK
dc.typeArticleen_UK

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