浆料反应器中吸附剂粒子对CO_2气体的吸收强化

Enhancement of CO_2 gas absorption in agitated slurry reactor by the adsorptive particles

研究了吸附剂粒子对气体吸收的增强作用。在一个带有搅拌的间歇反应釜中,分别测定了CO2在活性炭/水、S iO2/水浆液以及在活性炭/环己烷、S iO2/环己烷浆液中的吸收速率和增强因子。实验温度为298.15 K,初始压力为0.1 MPa,浆液中粒子的固含率为0—2 kg/m3,搅拌速度为1 s-1和4 s-1。结果表明,活性炭/水、S iO2/环己烷体系对CO2的吸收具有明显的增强作用,而S iO2/水、活性炭/环己烷体系则没有发现增强作用。因此,只有具有界面亲合能力且对溶质有吸附作用的颗粒才能对气体吸收产生显著的强化作用。将界面划为粒子覆盖和未覆盖区,提出了一个预测增强因子的一维双区模型,并进行了求解,模型预测值与实验结果吻合良好。

The enhancement of adsorptive particles to gas absorption was investigated. The absorption rate and enhancement factor of CO2 absorption in AeC/H2O, SiO2/H2O and AeC/eyelohexane, SiO2/eyelohexane slurries were measured experimentally. The absorption experiments were carried out in a batch stirred cell reactor under the conditions of 298.15 K, initial pressures 0.1 MPa, solid loading 0-2 kg/m^3 and stirring speeds 1 s^-1 and 4 s^-1. The experimental results show that the absorption of CO2 are enhanced significantly in AeC/H2O and SiO2/eyelohexane slurries, but less enhancement is found in SiO2/H2O and AeC/eyelohexane slurries. Therefore, only the adsorptive particles in small size with interracial affinity can enhance considerably the absorption of gas. A new one-dimensional and two-zone model was proposed for the prediction of enhancement in terms of the partition of interracial region into two individual zones, i. e. , particles-covered zone and uncovered zone, the model was solved and the calculated results indicate that the prediction values by present model are in good agreement with the experimental data.