Study on Adsorption Kinetics of Gaseous Iodine by 8% Silver Loaded Mordenite
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摘要: 为了除去乏燃料后处理过程产生的放射性碘，本研究采用8%载银量的丝光沸石作为吸附剂，采用动态吸附法研究了在气体线速度、吸附柱高度、湿度和NO2体积分数等因素下其对气态碘的吸附效果的影响。实验结果表明，气体线速度对饱和吸附容量几乎没有影响，在较低气体线速度条件下，吸附柱传质阻力会增大；吸附柱高度对传质阻力几乎没有影响，随着吸附柱高度的增加，饱和吸附容量有一定的提高；湿度不影响吸附效果；NO2对吸附效果具有促进作用；Yoon-Nelson模型能够很好地拟合碘在8%载银丝光沸石吸附柱上的吸附过程。Abstract: To remove radioactive iodine from spent fuel reprocessing, in this study, 8% silver loaded mordenite was used as the adsorbent, and the dynamic adsorption method was used to study the effects of gas linear velocity, adsorption column height, humidity and NO2 volume fraction on the adsorption effect of gaseous iodine. The experiment results show that the gas linear velocity has little effect on the saturated adsorption capacity, and the mass transfer resistance of the adsorption column increases at lower gas linear velocity; The height of the adsorption column has little effect on the mass transfer resistance. With the increase of the height of the adsorption column, the saturated adsorption capacity increases to a certain extent; Humidity does not affect the adsorption effect; NO2 can promote the adsorption effect; Yoon-Nelson model can well fit the adsorption process of iodine on 8% silver loaded mordenite adsorption column.
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Key words:
- Silver loaded mordenite /
- Post treatment /
- Gaseous iodine /
- Kinetics
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图 1 动态吸附实验流程图
1—高纯氮气瓶；2~5—转子流量计；6—干湿气体混合瓶；7~8—水蒸气发生器；9—碘蒸汽发生器；10—1% NO2气瓶；11—气体混合器；12—气体缓冲器；13~14—吸附柱；15—温湿度仪；16~18—取样瓶；19~21—尾气吸收瓶；22~23—显色瓶；24~36—阀门
Figure 1. Flow Chart of Dynamic Adsorption Experiment
图 2 气体线速度对8%载银丝光沸石穿透曲线的影响
Figure 2. Effect of Gas Linear Velocity On Penetration Curve of 8% Silver Loaded Mordenite
图 3 吸附柱高度对8%载银丝光沸石穿透曲线的影响
Figure 3. Effect of Adsorption Column Height on Penetration Curve of 8% Silver Loaded Mordenite
图 4 湿度对8%载银丝光沸石穿透曲线的影响
Figure 4. Effect of Humidity on Penetration Curve of 8% Silver Loaded Mordenite
图 5 NO2体积分数对8%载银丝光沸石穿透曲线的影响
c—NO2体积分数；T—温度
Figure 5. Effect of NO2 Volume Fraction on Penetration Curve of 8% Silver Loaded Mordenite
图 6 8%载银丝光沸石吸附柱不同线速度下的Yoon-Nelson拟合曲线图
Figure 6. Yoon-Nelson Fitting Curve of 8% Silver Loaded Mordenite Adsorption Column at Different Linear Velocities
图 7 8%载银丝光沸石吸附柱不同吸附柱高度下的Yoon-Nelson拟合曲线
Figure 7. Yoon-Nelson Fitting Curve of 8% Silver Loaded Mordenite Adsorption Column at Different Column Heights
表 1 在不同温度、湿度、NO2体积分数下8%载银丝光沸石的吸附容量
Table 1. Adsorption Capacity of 8% Silver Loaded Mordenite under Different Temperatures, Humidity and NO2 Volume Fractions
温度/
℃相对湿
度/%NO2体积
分数/%穿透时
间/min穿透吸附量/
(mg·g−1)饱和吸附量/
(mg·g−1)30 100 0.1 200 81.6 102.5 70 100 0.1 245 100 127.1 70 50 0.1 240 96.8 128.3 70 15 0.1 255 102.8 129.6 30 100 0.3 245 100 112.8 70 100 0.3 280 114.4 133.2 
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表 2 不同线速度下的Yoon-Nelson模型参数
Table 2. Yoon-Nelson Model Parameters at Different Linear Velocities
线速度/(cm·s−1) k′/min−1 τ/min τexp/min R2 22 0.034 251.2 250.6 0.916 13 0.030 376.7 406.5 0.964 5.5 0.013 1032.3 990.6 0.970 τexp—实验所得的50%的穿透时间
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表 3 不同吸附柱高度下的Yoon-Nelson模型参数
Table 3. Yoon-Nelson Model Parameters at Different Adsorption Column Heights
吸附柱高度/ cm k′/min−1 τ/min τexp/min R2 2.2 0.035 300.0 300.0 0.954 4.4 0.029 641.7 630.4 0.963 6.6 0.024 950.0 954.6 0.990
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