Experimental study of a single char particle combustion characteristics in a fluidized bed under O2/H2O condition

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dc.contributor.authorLi, Lin
dc.contributor.authorDuan, Lunbo
dc.contributor.authorYang, Zhihao
dc.contributor.authorTong, Shuai
dc.contributor.authorAnthony, Edward J.
dc.contributor.authorZhao, Changsui
dc.date.accessioned2019-10-04T07:57:14Z
dc.date.available2019-10-04T07:57:14Z
dc.date.issued2019-09-23
dc.description.abstractOxy-steam combustion is a potential new route for oxy-fuel combustion with carbon capture from coal-fired power plants. In the present work, the combustion behavior of single char particles were investigated in a transparent fluidized bed combustor under different operating conditions (i.e., gas atmosphere, oxygen concentration, coal rank, location, fluidization number, particle size, and bed temperature). Both pre-calibrated two-color pryrometry and a flexible thermocouple were used to measure the char particle temperature in the combustion tests. Results indicated that the pore structure of the char generated in H2O atmosphere was better than that generated in CO2 and N2 atmospheres. As expected, with increase of oxygen concentration, the burnout time (tb) decreased, and the particle temperature (Tp) increased. The sequence of burnout times for different rank coal char particles was: anthracite > bituminous coal > lignite. Interestingly, comparing O2/CO2 and O2/N2 combustion, a shorter tb and a lower Tp of char could be achieved simultaneously in O2/H2O combustion, regardless of location and oxygen concentration. Furthermore, the increase of fluidization number strengthened the mass and heat transfer between the char and the environment, thereby reducing the tb and Tp of char. With increasing of particle size, the Tp slightly decreased, the tb increased markedly, and the gasification reactions became more and more significant. As the bed temperature increased, the gasification rate increased exponentially, and the mass transfer coefficient increased gradually.en_UK
dc.identifier.citationLi L, Duan L, Yang Z, et al., (2019) Experimental study of a single char particle combustion characteristics in a fluidized bed under O2/H2O condition. Chemical Engineering Journal, Volume 382, February 2020, Article number 122942en_UK
dc.identifier.issn1385-8947
dc.identifier.urihttps://doi.org/10.1016/j.cej.2019.122942
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14590
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.subjectFluidized beden_UK
dc.subjectsingle char particleen_UK
dc.subjectO2/H2O combustionen_UK
dc.subjectparticle temperatureen_UK
dc.subjectburnout timeen_UK
dc.titleExperimental study of a single char particle combustion characteristics in a fluidized bed under O2/H2O conditionen_UK
dc.typeArticleen_UK

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