摘要
为了提高石灰石在燃煤电站循环煅烧/碳酸化过程中捕集CO2的性能,采用木醋废液对其调质处理。在煅烧/碳酸化反应器上研究了木醋废液调质石灰石循环捕集CO2特性,通过循环反应中样品质量变化得到表征样品捕集CO2性能的参数——碳酸化转化率。分别通过X射线衍射仪(x-ray diffraction,XRD)和场发射电子显微镜(scanning electron microscope,SEM)分析考察调质石灰石的物相和微观结构,以阐明反应机理。结果表明,木醋废液调质提高了石灰石的循环碳酸化转化率;石灰石/木醋废液比例越低,调质石灰石的循环碳酸化转化率就越高,最佳石灰石/木醋废液比例为20 g/400 mL。调质石灰石在700℃时取得最大循环碳酸化转化率。在高煅烧温度下,调质石灰石抗烧结性能高于石灰石。在最佳反应条件下经过20次循环后调质石灰石转化率可达46%,为石灰石的2.9倍。调质石灰石的主要成分是水合醋酸钙。与石灰石相比,在循环反应中调质石灰石煅烧后具有更优的微观结构,更适于循环捕集CO2。
In order to improve the CO2 capture capacity of limestone in the cyclic calcination/carbonation cycles for coal-fired power plants, the limestone was modified by the waste wood vinegar. The cyclic CO2 capture behavior of the modified limestone was investigated in a calcination/carbonation reactor. The carbonation conversion was calculated according to change of the sample in the cyclic reactions, which characterized CO2 capture capacity of the sample. The phase and the microstructure of the modified limestone were examined by XRD （ X-ray diffraction） and SEM （ scanning electron microscope） analysis to reveal the reaction mechanism. The results showed that the cyclic carbonation conver- sion of the limestone was enhanced after the modification treatment. The modified limestone with lower ratio of lime-stone/waste wood vinegar got, higher carbonation conversion. The optimum ratio of limestone to waste wood vinegar was 20 g/400 mL. The modified limestone exhibited the highest cyclic carbonation conversion at 700 ~C. The modified limestone showed higher sintering resistance than the limestone at the high calcination temperature. The carbonation con- version of the modified limestone after 20 cycles achieved 46% at the optimum reaction conditions, which was 2. 9 times higher than that of the limestone. The main composition of the modified limestone was the calcium acetate hydrate. The calcined modified limestone demonstrated better microstructure in the multiple cycles, compared with the limestone which was suitable for cyclic CO2 capture.
出处
《山东大学学报（工学版）》
CAS
北大核心
2013年第3期82-86,共5页
Journal of Shandong University（Engineering Science）
基金
高等学校博士学科点专项科研基金资助项目(20100131120055)
关键词
木醋废液
调质
石灰石
煅烧
碳酸化
CO2捕集
waste wood vinegar
modification
limestone
calcination
carbonation
CO2 capture
