新型CaO/MgO高温CO_2吸收剂的循环反应特性

Cyclic Reaction Characters of Novel CaO/MgO High Temperature CO_2 Sorbents

本文采用3种方法制备了新型复合CaO/MgO吸收剂,考察了不同制备方法对复合钙基吸收剂碳化/煅烧循环反应性能的影响。结果表明,不同制备方法能决定了钙基吸收剂中CaO颗粒与MgO颗粒在微观层面上的不同均匀混合程度,因此得到吸收剂的性能差异巨大。采用溶胶凝胶燃烧合成法制备的CaO/MgO吸收剂的性能明显优于其他两种常见方法制备的吸收剂。通过该方法制备的CaO与MgO的摩尔比为4:1的吸收剂在多次循环后拥有最高的CO_2吸收容积,在循环反应中保持了良好的抗烧结性能。

The novel synthetic CaO/MgO sorbents were prepared by three methods, and the effects of different preparation methods on the cyclic carbonation/calcination reaction performance of the synthetic Ca-based sorbents were investigated in this study. The results show that the different preparation methods dominate the mixing degree of CaO grains and MgO grains at the microscopic level in the Ca-based sorbents, leading to the wide different behavior of the sorbents. The performance of the CaO/MgO sorbent made by sol-gel-combustion-synthesis method is much better than that of the sorbents made by the other two normal methods. The sorbent with a molar ratio of CaO to MgO of 4：1 made by this method, which has a good behavior of anti-sintering during cyclic reactions, achieves the highest CO2 adsorption capacity after multiple cycles.