以海水作为吸收剂,采用模拟烟气,对气−液膜接触器进行传质性能评价试验,考察其工艺结构参数、气液介质流动速率及方式、气液压差、烟气SO2浓度等因素对传质系数、脱硫率及膜效用的影响.试验表明,在气相压力较低情况下,气液流速、气液压差对总气相传质系数影响明显,而烟气SO2浓度的影响可忽略不计.适当提高膜接触器的填充密度,增加膜吸收级数,采用错流模式的气液流动方式,均可改善烟气流场分布,增大有效传质面积,提高膜效用.与传统吸收塔相比,新型膜气体吸收装置的气液两相独立控制,可灵活应对烟气浓度变化对脱硫稳定性的影响,同时具有低气阻、耐污染、规模可线性放大等优点,工业化应用前景广阔.

In this paper, G-L membrane contactor was applied for SO₂ removal from simulation flue gas using seawater as absorbent. The effects of membrane contactor structure parameters, flow rate and mode between gas and seawater, pressure gradient and SO₂ concentration on mass transfer, desulfurization efficiency and membrane utility were investigated. The results showed that flow rate and pressure gradient evidently affected overall gas mass transfer coefficient on condition of low gas pressure, but the effect of SO₂ concentration could be ignored. Increasing membrane absorber packing density, membrane absorption stage and cross flow mode could improve gas distribution in the flow field, increase the efficient mass transfer area and membrane utility. Compared with traditional absorption tower, novel membrane gas absorption equipment can control the gas and seawater independently, coping with gas concentration variation flexibly. In addition, the main advantages of membrane absorber are low pressure drop, resistant fouling and easy scale-up membrane absorber, so has broad industrialization application prospect.