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在难溶气体吸收体系中加入第3分散相粒子是强化传质过程的一个重要手段,文中采用恒温搅拌釜对ZSM-5型分子筛/水浆料强化CO2的吸收过程进行了实验研究,考察了硅铝摩尔比(120,150,360)、固含率和气相CO2体积分数对增强因子的影响。结果表明:随着分子筛硅铝摩尔比的增加,其疏水性增强,增强因子随之增大;随着分子筛固含率的增加,气液界面处颗粒的覆盖率增大,增强因子迅速增大,当气液界面处颗粒的覆盖率逐渐接近最大覆盖率时,则增强因子逐渐趋于恒定值;随着气相CO2体积分数的增加,溶质在溶液中的扩散作用逐渐增强,而分子筛颗粒输运作用逐渐减弱,增强因子减小。针对分散相微粒增强难溶气体的吸收过程,提出了一个三维非均相传质模型,计算结果和实验数据吻合良好。
Addition of the third dispersed phase particles to the insoluble gas absorption system is an important means to enhance the mass transfer process. The absorption process of the enhanced CO2 of ZSM-5 molecular sieve / water slurry was investigated by means of a constant temperature stirred tank. Silicon aluminum molar ratio (120,150,360), solid content and gas phase CO2 volume fraction on the enhancement factor. The results show that with the increasing molar ratio of silicon and aluminum, the hydrophobicity increases and the enhancement factor increases. With the increase of the solid content of the molecular sieve, the particle coverage at the gas-liquid interface increases and the enhancement factor increases rapidly When the coverage of particles at the gas-liquid interface gradually approached the maximum coverage, the enhancement factor tended to be a constant value. With the increase of the volume fraction of gas-phase CO2, the diffusion of solute in solution gradually increased, while the transport of molecular sieve particles The role of gradually weakened to enhance the factor decreases. Aiming at the absorption process of dispersed phase particles to enhance the absorption of insoluble gas, a three-dimensional heterogeneous mass transfer model is proposed. The calculated results are in good agreement with the experimental data.