单颗粒多孔MgO吸附剂CO2吸附流动传输的格子Boltzmann方法模拟

Lattice Boltzmann simulation of flow and mass transfer of CO2 adsorption in porous MgO particle

应用格子Boltzmann方法对MgO颗粒CO2吸附过程流动与传输特性进行模拟。基于二级反应动力学模型,研究孔隙率和粒径对颗粒内渗流速度、CO2浓度、CO2吸附速率和MgO颗粒固体转化率的影响。结果表明:沿流动方向颗粒内CO2浓度与颗粒转化率逐渐递减;在相同时间下,颗粒粒径越大,颗粒内渗流速度和CO2浓度越低,转化率和吸附速率越低;相同粒径和相同时间下,孔隙率越大,CO2浓度和MgO固体转化率越高,平均吸附速率越快。

The lattice-Boltzmann method was used to simulate the characteristics of flow and mass transfer of CO2 adsorption process in Mg O particle. Effects of porosity and particle size of the Mg O particle on the percolation velocity,CO2 concentration,CO2 adsorption rate,and adsorbent conversion rate were simulated based on the second-order reaction kinetic model. The results show that the CO2 concentration and adsorbent conversion rate decreased gradually along the gas flow direction in Mg O particle. For the same adsorption time,the bigger the particle size was,the lower the percolation velocity,CO2 adsorption rate,and adsorbent conversion rate in particle were. For the same adsorption time and particle size,with the increase in the porosity of the particle,the absorbent conversion rate and CO2 concentration increased and the average adsorption rate also sped up.