螺旋型旋转吸收器

HELICAL ROTATING ABSORBER

传统的吸收设备一般为塔型。传质的效果除与气液接触面的大小、气液流动状况、气液本身的物理性质等因素有关外,还与重力加速度g密切相关。Van Krevelen等推导出的关系式中,传质系数是k_L∞g^(1/3),Vivian通过对湿壁塔中气体吸收过程的研究,Norman等利用溶质渗透理论,都导出k_L∞g^(1/6)。但g是一个不可改变的有限值,若用人为可改变的旋转速度ω取代,则是一条强化传质过程的途径。作者从1983年研究旋转吸收器,屡经改进,制造了现用的实验螺旋型旋转吸收器。用该装置的实验结果表明,当ω增大时,k_L和α随之增大,液泛速度相应提高,操作范围增大,传质效果增强。

A new type of absorber, helical rotating absorber, has been developed. This kind of absorber is different from other rotating ones, with the advantages of simple structure and high mass - transfer efficiency. Experimental results showed that the interfacial surface area per volume of the absorber a was 20 times higher than that of the B - 25 whirlflow tower plates, and its liquid-side mass -transfer coefficient kL is about 0. 08 cm/s. The thickness of the liquid film is thinner than that of gravity flow. The higher the rotating velocity, the higher the a and kL