成型助剂对过量负载钠基吸附剂强度及CO_(2)吸附性能的影响  

Effect of Molding Aids on Strength and CO_(2) Sorption Performance of Excessive Load Sodium-Based Sorbents

作　　者：常鸣华 陈晓平[1] 蔡天意 刘威[1] 许志康 刘道银[1] 吴烨[2] 马吉亮[1] CHANG Minghua;CHEN Xiaoping;CAI Tianyi;LIU Wei;XU Zhikang;LIU Daoyin;WU Ye;MA Jiliang(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education(Southeast University),Nanjing 211189,Jiangsu Province,China;School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu Province,China)

机构地区：[1]能源热转换及其过程测控教育部重点实验室(东南大学),江苏省南京市211189 [2]南京理工大学能源与动力工程学院,江苏省南京市210094

出　　处：《中国电机工程学报》2021年第11期3683-3691,共9页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2017YFB0603300)。

摘　　要：燃煤电厂CO_(2)大量排放引起的温室效应等环境问题日益加剧,因此对燃煤电厂CO_(2)捕集技术的研究有着重要意义。以γ-Al_(2)O_(3)为载体,采用过量浸渍法制备了粉状钠基吸附剂,在挤压滚圆成型过程中加入不同的成型助剂制成吸附剂颗粒。利用压力试验机和固定床反应器测定不同吸附剂颗粒抗压强度及CO_(2)吸附性能,结果显示:未添加助剂的吸附剂吸附性能较好,但成型后抗压强度较低;添加高铝水泥可以提升吸附剂颗粒的抗压强度并使其保持较高的Na_(2)CO_(3)转化率;添加微晶纤维素会使吸附剂颗粒的强度及吸附性能均下降;添加羧甲基纤维素钠可以提高吸附剂颗粒的吸附性能,但使其抗压强度降低明显。最终选出综合性能与经济型较好的制备方法,为钠基吸附剂的工业化制备与应用提供了理论指导。Massive emission of CO_(2) produced by coal-fired power plants leads to increased environmental problems,especially the greenhouse effect. Therefore, the research of CO_(2) capture technologies for coal-fired power plants is significant. Using γ-Al_(2)O_(3) as the carrier, the powdered sodiumbased sorbent was prepared by the excessive impregnation method, and the sorbent spheres were prepared by adding different molding aids in the extrusion-spheronization process.The compressive strength and CO_(2) sorption performance were measured by compressive strength testing machine and fixed bed reactor. The excessively loaded sodium-based sorbent has strong sorption performance but low compressive strength after molding. The addition of high alumina cement improves the compressive strength of sorbent spheres and maintains high Na_(2)CO_(3) conversion. The addition of microcrystalline cellulose degrades the compressive strength and sorption performance of the sorbent spheres. The addition of sodium carboxymethyl cellulose increases the sorption performance of the sorbent spheres but reduces the compressive strength significantly.Finally, the preparation method with better comprehensive performance and economy is selected to provide the theoretical guidance for the industrialized preparation and application of sodium-based sorbents.

关 键 词：碳捕集 钠基吸附剂 挤压滚圆 抗压强度 CO_(2)吸附性能 

分 类 号：TK09[动力工程及工程热物理]