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采用冷冻成粒法、喷雾干燥法、浸渍法、机械混合法批量制备了Fe2O3/Al2O3氧载体,从氧载体产率、制备周期、物理化学表征、煤化学链燃烧中氧载体性能等角度比较各种批量制备方法,确定合适的批量制备技术。实验结果表明,冷冻成粒法的氧载体产率较高,机械性能最优;与褐煤的化学链燃烧实验中,喷雾干燥法和冷冻成粒法制备的氧载体导致碳转化速率较快,然后依次为浸渍法和机械混合法;且前两种方法制备的氧载体的循环稳定性高;不同方法制备的氧载体在第1—4次还原过程中,CO2捕集率均在88%以上,CO2气产率伴随着C转化率的增大而增大,最后接近100%,燃烧效率均在90%以上,表明使用以上4种方法制备的氧载体对CO2捕集效果都较好,对可燃成分的利用程度也都较高。当褐煤作为燃料时,可优先采用由冷冻成粒法和喷雾干燥法批量制得的氧载体。
The Fe2O3 / Al2O3 oxygen carrier was prepared by freeze granulation method, spray drying method, impregnation method and mechanical mixing method. The oxygen carrier yield, preparation period, physical and chemical characterization, oxygen carrier performance in coal chemical combustion Batch preparation methods to determine the appropriate batch preparation techniques. The experimental results show that the oxygen carrier yield of frozen granulation method is higher and the mechanical properties are the best. In the chemical chain combustion experiment of lignite, the oxygen carrier prepared by spray drying method and freeze granulation method leads to faster carbon conversion rate, Followed by the impregnation method and the mechanical mixing method; and the oxygen carrier prepared by the first two methods has high cycle stability; the oxygen carrier prepared by different methods has a CO2 capture rate of over 88% in the first to the fourth reduction processes, The CO 2 production rate increased with the increase of the conversion of C, and finally reached 100%. The combustion efficiency was above 90%, indicating that the oxygen carriers prepared by the above four methods all had better CO2 capture efficiency, The level of utilization of ingredients is also high. When brown coal is used as a fuel, the oxygen carrier batch-prepared by the freeze-granulation method and the spray-drying method can be preferably used.