Investigation of Y2O3/MgO-modified extrusion-spheronized CaO-based pellets for high-temperature CO2 capture
Investigation of Y2O3/MgO-modified extrusion-spheronized CaO-based pellets for high-temperature CO2 capture
复制标题
用于高温 CO2 捕获的 Y2O3/MgO 改性挤出滚圆 CaO 基颗粒的研究
DOI：
10.1002/apj.2366
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发表时间：
2019
影响因子：
1.8
通讯作者：
Ran Jingyu
中科院分区：
文献类型：
--
作者：
Pi Shuai;Zhang Zonghao;He Donglin;Qin Changlei;Ran Jingyu
为开发具有高效稳定CO2捕集能力和足够机械强度的CaO基颗粒脱硫剂，以应用于循环流化床钙环技术，采用3种合成方法制备了掺Y2 O3/MgO的CaO基脱硫剂，并采用挤出滚圆法制备了颗粒脱硫剂。结果表明，湿式行星球磨是大规模吸附剂制备的一种很好的潜在常规方法。此外，还研究了湿球磨液固比、Y2 O3/MgO质量比等因素对粉体性能的影响。结果表明，在确定的最佳液固比为1：1、Y2 O3/MgO质量比为2：1的条件下，球形Y2 Mg 1 -1/1吸收剂具有良好的循环CO2捕集性能和较快的碳酸化速率，循环62次后CO2吸收量为0.1399 g-CO2/g-吸着剂，比纯Ca（OH）2颗粒（CH）提高约31.1%。这主要是由于均匀分布的小颗粒和固体载体以及湿球磨颗粒中增强的孔结构。此外，对球团进行了长时间流化磨损试验，观察到Y2 Mg 1 -1/1的平均磨损率仅为CH的1/3。即使在高温下的重复碳酸化/煅烧过程中，Y2 Mg 1 -1/1仍然具有优异的耐磨性。
To develop CaO‐based sorbent pellets with highly efficient and stable CO2capture capacity and sufficient mechanical strength for the application of calcium looping in circulating fluidized beds, Y2O3/MgO‐incorporated CaO‐based sorbents were fabricated via three synthesis methods and then sorbent pellets were prepared via extrusion and spheronization in the paper. Results showed that wet planetary ball milling was a good potential routine for large‐scale sorbent preparation. Additionally, impacts of liquid/solid ratio in wet ball milling and mass ratio of Y2O3/MgO were also investigated comprehensively. It was found that under the optimal liquid/solid ratio of 1:1 and Y2O3/MgO mass ratio of 2:1 determined, spherical Y2Mg1–1/1 sorbent exhibited desirable cyclic CO2capture performance with a fast carbonation rate, achieving a CO2uptake of 0.1399 g‐CO2/g‐sorbent after 62 cycles and improved about 31.1% in comparison of pure Ca (OH)2pellets (CH). This was mainly owning to homogeneously distributed small grains and solid supports as well as enhanced pore structure in the wet ball‐milled pellets. Furthermore, long‐time fluidized attrition test was performed on the pellets, and the average attrition rate of Y2Mg1–1/1 was observed to be only one third that of CH. Even in the repeated carbonation/calcination process under high temperature, Y2Mg1–1/1 still possessed an excellent resistance to attrition.