CO2 的大量排放会导致气候变化,威胁人类生存.如何遏制与中和碳排放,高效实现碳捕捉,已经是科研工作者最关心的话题之一.利用流化床颗粒采样器,通过改变升温速率、流化气氛,研究菱镁矿非等温条件下的反应特性与N2、CO2 条件下对产物活性的影响,利用TG、BET、XRD、SEM对轻烧产物的活性及微观结构进行表征.结果表明:CO2 气氛抑制菱镁矿分解,当原料分解完全后,温度继续升高,晶粒尺寸逐渐变大,比表面积变小,柠檬酸法显色时间变长,活性降低;改变升温速率,升温速率变化越快,菱镁矿内外受热温度越不均,内外分解差异越大,菱镁矿分解率越低,柠檬酸显色时间越长;相同条件下,与N2 气氛相比,CO2 气氛的柠檬酸法显色时间用时更久,即产物的活性由微观结构与分解率决定.
Effect of Coproduction of CO2 and Atmosphere on Products of Magnesite Calcined by Fluidized Bed
A large amount of CO2 emissions will lead to climate change and threaten human survival.How to curb and neutralize carbon emissions and realize carbon capture efficiently has become one of the most concerned topics for researchers.The fluidized bed particle sampler was used to study the reaction characteristics of magnesite under non-isothermal conditions and the influence of N2 and CO2 on the product activity by changing the heating rate and fluidizing atmosphere.TG,BET,XRD and SEM were used to characterize the activity and microstructure of light fired products.The results showed that CO2 atmosphere inhibited the decomposition of magnesite.When the raw material was completely decomposed,the temperature continued to increase,the grain size gradually increased,the specific surface area became smaller,the citric acid process color development time became longer,and the activity decreased.The faster the heating rate change,the more uneven the heating temperature inside and outside magnesite,the greater the decomposition difference between inside and outside,the lower the decomposition rate of magnesite,the longer the color development time of citric acid.Under the same conditions,compared with N2 atmosphere,the citric acid process took longer to develop color in CO2 atmosphere,that was,the activity of the product was determined by the microstructure and decomposition rate.
MagnesiteNon-isothermalCoproduction of CO2Fluidized bed
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