不同烟气水蒸气体积分数时ZL50活性炭吸附SO2的动力学  

Kinetics of SO_2 adsorption by ZL50 activated carbon for various water vapor volume fractions

作　　者：高继贤[1] 王铁峰[1] 王光润[1] 王金福[1] 

机构地区：[1]清华大学化学工程系,绿色反应工程与工艺北京市重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第3期434-437,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为描述不同烟气水蒸气体积分数时ZL50活性炭吸附SO2的烟气脱硫动态吸附过程，采用表观吸附动力学模型，对SO2的动态吸附过程加以描述、分析和比较。结果表明，在所研究的条件范围内，模拟效果从优到次为：Bangham模型、Elovich模型、准二级动力学模型、Lagergren准一级动力学模型、粒内扩散模型。颗粒外气膜扩散不是速控步骤，颗粒孔扩散不是吸附的唯一速控步骤；水蒸气体积分数为0时，粒内微孔扩散近似为速控步骤；而水蒸气体积分数为0．04～0．20时，吸附速率为表面反应或表面反应与微孔扩散联合控制。The adsorption of SO2 on ZL50 activated carbon was analyzed for various water vapor volume fractions in the flue gas for flue gas desulphurization. Several apparent adsorption kinetic models were used to predict the SO2 adsorption. The adsorption process best follows the Bangham model, then the Elovich model, the pseudo second order kinetic model, the pseudo first order kinetic model of Lagergren and then the intraparticle diffusion model The results further indicate that the external gas film diffusion was not the rate-determining step and that the internal pore diffusion was not the only adsorption rate-determining step. The internal micropore diffusion was the most important rate-determinlng step without water vapor, while the rate-determining step with water vapor volume fractions of 0.04 - 0.20 was the surface reactions or a combination of the surface reactions and micropore diffusion.

关 键 词：烟气脱硫 水蒸气 表观吸附动力学模型 活性炭 

分 类 号：X701.3[环境科学与工程—环境工程] X511