【摘要】 使用Aspen Adsorption对经过预处理的锅炉烟道气进行吸附过程数值模拟,通过对文献中静态吸附数据进行吸附等温线常数的估算,建立了烟道气的单塔吸附模型。模拟得出了CO₂的吸附穿透曲线和吸附塔内不同时刻的轴向负载分布,其穿透曲线、吸附量的变化趋势基本与文献上一致。在Langmuir1吸附模型下,比较了不同压力、温度、CO₂的传质系数、吸附剂的堆积密度和颗粒直径对CO₂吸附过程的影响。结果表明:CO₂在200 kPa和298.15 K下的穿透时间为110 s,吸附量为1.2×10^-5 kmol/kg;操作压力在100～500 kPa时,随着压力的增大穿透时间增大、吸附量增大;操作温度在278.15～338.15 K时,对CO₂的穿透曲线影响较小,基本随着温度的增大,穿透时间减小;传质系数在0.1 s^-1左右时,对CO₂的穿透曲线影响较大,但在1 s^-1左右时对穿透曲线影响较小;吸附剂堆积密度在600～900 kg/m³时,随堆积密度的增大,穿透时间增大;吸附剂颗粒直径在1～4 mm时,基本不影响CO₂穿透曲线。更多还原

【Abstract】 The adsorption process of pre-treated boiler flue gas was simulated numerically by Aspen Adsorption software. A single tower adsorption model of flue gas was established by the adsorption isotherm constants which were estimated from static adsorption data of the literature. CO₂ adsorption breakthrough-curve and axial load distribution of adsorption tower were simulated in different time. The breakthrough curve and the literature were basically consistent, which proved the correctness of this adsorption model. The effects of pressure, temperature and mass transfer coefficient of CO₂ on CO₂ adsorption were compared. The simulation results showed that the breakthrough time of CO₂ at 200 kPa and 298.15 K was about 110 s, and the adsorption capacity was 1.2×10^-5 kmol/kg. In 100～500 kPa, with the increase of pressure and the breakthrough time, the adsorption capacity increased. At 278.15～338.15 K, temperature had little influence on CO₂ breakthrough curve, and the breakthrough time decreased with the increase of temperature. The mass transfer coefficient had a great influence on the breakthrough curve of CO₂ when it was about 0.1 s^-1, while had a little influence on the breakthrough curve when it was about 1 s^-1. When the bulk density of adsorbent was 600～900 kg/m³, the breakthrough time increased with the increase of the bulk density. When the diameter of adsorbent particles was 1～4 mm, the breakthrough curves of CO₂ was basically not affected.更多还原