The simultaneous calcination/sulfation reaction of limestone under oxy-fuel CFB conditions

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dc.contributor.authorChen, Liang
dc.contributor.authorWang, Chunbo
dc.contributor.authorYan, Guangjing
dc.contributor.authorZhao, Fan
dc.contributor.authorAnthony, Edward J.
dc.date.accessioned2018-10-24T14:04:43Z
dc.date.available2018-10-24T14:04:43Z
dc.date.issued2018-10-16
dc.description.abstractUsing a customized thermogravimetric analyzer, the characteristics of the simultaneous calcination/sulfation reaction of limestone (the simultaneous reaction) under oxy-fuel circulating fluidized bed (CFB) boiler conditions were investigated. The results were compared with the calcination-then-sulfation reaction (the sequential reaction) that has been widely adopted by previous investigators. The sample mass in the simultaneous reaction was higher than that in the sequential reaction. With the increase of SO2 concentration (0–0.9%), the mass difference between the two reaction scenarios increased; while with the increase of temperature (890–950 °C), the difference became smaller. Calcination in the presence of SO2 was slower than that without SO2. With the increase of SO2 concentration, the pore volume of the calcined CaO decreased, and the effectiveness factors of the calcination reaction also declined. This indicates when CaSO4 forms, the pores in CaO were filled or blocked, thus increasing the internal resistance to CO2. Because the simultaneous process is the real one in CFB boilers, and it shows different characteristics from the sequential reaction, all investigations of CaO sulfation in CFB should follow this approach. Also in this work, the effects of SO2 concentration, temperature and H2O on the simultaneous reaction were studied. The sulfation ratio in the simultaneous reaction increased with higher SO2 concentration. Compared with that in the absence of H2O, 8% H2O in flue gas significantly improved sulfation. In the tested range (890–950 °C), the optimum temperature for sulfation was around 890 °C. The sulfation rate in the mass-loss stage was higher than that in the fast sulfation stage, which is likely due to the continuous generation of nascent CaO in this stage.en_UK
dc.identifier.citationLiang Chen, Chunbo Wang, Guangjing Yan, et al., The simultaneous calcination/sulfation reaction of limestone under oxy-fuel CFB conditions. Fuel, Volume 237, 1 February 2019, Pages 812-822en_UK
dc.identifier.issn0016-2361
dc.identifier.urihttps://doi.org/10.1016/j.fuel.2018.10.060
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/13563
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectOxy-fuelen_UK
dc.subjectCalcinationen_UK
dc.subjectSulfationen_UK
dc.subjectSimultaneous reactionen_UK
dc.subjectLimestoneen_UK
dc.subjectCFBen_UK
dc.titleThe simultaneous calcination/sulfation reaction of limestone under oxy-fuel CFB conditionsen_UK
dc.typeArticleen_UK

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