The extent of sorbent attrition and degradation of ethanol-treated CaO sorbents for CO2 capture within a fluidised bed reactor

摘要

The application of an ethanol pre-treatment step on biomass-templated calcium looping sorbents resulting in anudimproved pore structure for cyclic CO2 capture was investigated. Three ethanol solutions of varying concentrationsudwere used with an improved pore and particle structure, and thermogravimetric analyser CO2 carryingudcapacity arising with the 70 vol% ethanol solution. The extent of attrition of these sorbents was testedudwithin a fluidised bed reactor and compared against an untreated sorbent and a limestone base case. It foundudthat despite the ethanol-treated sorbents displaying an admirable CO2 carrying capacity within the thermogravimetricudanalyser even under realistic post-combustion conditions, this was not translated equivalently in theudfluidised bed. Attrition and elutriation of the biomass-templated sorbents was a significant issue and the ethanoludpre-treatment step appeared to worsen the situation due to the roughened surface and mechanically weakerudstructure.