吸收塔理论板的空间体积和持液量对低浓度杂质吸收效果的影响

Effect of Space volume and Liquid Holdup of Theoretical Plate on Absorption of Low Concentration Impurities

采用动态模拟方法,研究多晶硅生产过程中还原尾气干法回收装置中吸收塔的理论板空间体积、持液量对微量杂质吸收效果的影响。模拟时,将理论板设为圆柱型并具有一定的持液量,采用恒温的方法计算气液相分离过程。模拟结果表明,若理论板中没有持液量,理论板的空间体积增大对吸收效果没有显著影响;若理论板中的持液量保持不变,理论板空间体积越大,则吸收效果偏差越大。若理论板的空间体积保持不变,持液量越大,则吸收效果偏差越大。实际应用中,可以通过增加理论板数或者吸收液流量的方法消除持液量的不利影响。

In this paper,a dynamic simulation method was introduced to simulate the effect of theoretical plate liquid holdup of absorption tower on absorption of trace impurities in the dry recovery device of reduction tail gas during polysilicon production.In the simulation,the theoretical plate was set to be cylindrical and had a certain liquid holdup,and a constant temperature evaporation method was used to calculate the gas-liquid separation process.The simulation results showed that if there was no liquid holdup in the theoretical plate,the spatial volume increase of the theoretical plate had no significant effect on the absorption effect.If the liquid holdup in the theoretical plate remained unchanged,the larger the spatial volume of the theoretical plate was,the greater the deviation of the absorption effect was.If the space volume of the theoretical plate remained unchanged,the larger the liquid holdup,the greater the deviation of the absorption effect.In practical application,the negative effect caused by the liquid holdup of theoretical plates can be eliminated by increasing the number of theoretical plates or increasing the flow rate of absorption liquid.