鼓泡层内气态甲基碘的去除特性研究

Research on Performance of Gas Methyl Iodide Removal in Bubble Column Reactor

以安全壳过滤排放系统对甲基碘的去除为背景,采用碱性硫代硫酸钠溶液作为吸收工质,对甲基碘气体的去除特性进行实验研究。结果表明：溶液温度、系统压力、气体流量以及液位是影响甲基碘去除效果的重要因素;溶液温度对甲基碘气体去除的影响表现出分区效应;在0~80℃范围内,随着温度的增加去除效率变化明显,化学反应过程是限制该区域去除效率的主要因素;当温度高于80℃时,去除效率对温度的变化不再敏感,传质过程成为影响效率的主要因素;系统压力和液位对去除效率的影响均表现为线性关系,压力和液位的提高能够显著改善气体吸收过程;相反,气相容积流量的增加会导致甲基碘气体吸收效率明显降低。研究中还进一步发现,入口气体浓度的变化对去除效率的影响很小。

Based on the removal of gas methyl iodide by containment filter venting system, the alkalescent sodium thiosulphate solution was used as the absorber to study the characteristics of the absorption process with experiments. The results show that the temperature of solution, system pressure, gas flow rate and the height of liquid are important factors to influence the gas methyl iodide removal efficiency. The influence of temperature present a regional effect, in the range of 0~80℃, the removal efficiency increases obviously along with the improved temperature, while the chemical reaction process is a major factor that limiting the removal efficiency. When the temperature is higher than 80℃, the efficiency is no longer sensitive to the variation of temperature and the mass transfer process becomes the main limiting factors. The increase of system pressure or height of solution can enhance the gas absorption process significantly, and the removal efficiency improves linearly with two parameters. However, the gas volume flow rate plays an opposite role on the absorption process. In addition, the variation of entrance concentration has a little impact on the removal efficiency.