纳米颗粒强化TETA溶液富液解吸CO2的实验研究

Desorption of CO2 performance enhancement by nanoparticles in TETA rich solution

为探究纳米颗粒对TETA溶液富液解吸CO2的影响,采用两步法配制了相同基液质量分数、不同纳米颗粒的纳米流体,以电热套和鼓泡床为解吸实验装置,分别检测了在富液中加入不同纳米颗粒及分散剂后,不同反应时刻,富液中CO2的残余量,并与空白富液解吸结果作对比,得出纳米颗粒的种类、固含量和粒径及分散剂对解吸转化率、解吸增强因子和解吸能耗的影响。实验结果表明:添加TiO2和Al2O3纳米颗粒可以显著地加快解吸的传质速率,解吸增强因子随固含量及粒径的增加先增大后变小,即存在最佳固含量和最佳粒径;SiO2纳米颗粒对解吸过程的促进作用并不明显;纳米流体中加入分散剂后,促进传质能力增强,且解吸能耗降低,具有较好的经济性。结合纳米流体促进传质机理对实验结果做出了解释和分析。

In order to study the effect of nanoparticles on the desorption of CO2 in TETA rich solution, the nanofluids were prepared by two-step method with the same mass fraction of TETA and different nanoparticles. The heating mantles and bubble column were used as desorption experimental devices. The residual CO2 in the rich solution was measured at different reaction time after adding different nanoparticles and dispersants, and the results were compared with the blank rich solution desorption. The effects of the kinds of nanoparticles, solid content, particle size and dispersant on desorption conversion rate, desorption enhancement factor and desorption energy consumption were obtained. The results show that the mass transfer rate of desorption can be significantly accelerated by adding TiO2 and Al2O3 nanoparticles, and the desorption enhancement factor increases at first and then decreases with the increase of the solid content and particle size. That is, there is an optimal solid content and particle size;the effect of SiO2 nanoparticles on the desorption process is not obvious;after the addition of dispersant into nanofluids, the mass transfer ability is enhanced, and the energy consumption of desorption is reduced, which has better economy. The experimental results are explained and analyzed in combination with the mechanism of nanofluids enhancing mass transfer.