【作者】 李正兴；

【导师】 袁惠新；

【作者基本信息】 江南大学 ， 机械设计及理论， 2007， 硕士

【摘要】 本文从组分质量守恒方程出发,根据分散液相不同的运动传质形态建立了旋流吸收器内伴有化学反应的气液吸收传质模型。该模型与Danckwerts的表面更新模型在表达形式上是完全一致的,并且克服了前人由于只考虑稳态的扩散传质,没考虑对流和非稳态传质而使模型具有的局限性,因而得到的模型能够更好地描述旋流吸收器中的气液吸收过程。该传质模型指出,旋流场中的传质速率正比于扩散系数D和表面更新率S乘积的平方根,已有的实验结果也验证了这个正比关系。从实验结果来看,本文所设计的旋流吸收器与目前其它一些主要气液吸收装置相比有明显的优势:就吸收性能而言,本设备的液相传质系数和比相界面积两个指标均比一般的塔设备高出几倍,与旋转填料床等动态超重力设备相比,吸收性能不相上下,但由于其本身是静态设备,因而在设备的制造、运行和维护上更加方便。在此基础上,本文探讨了旋流吸收器强化传递过程的机理,并尝试利用CFD软件对旋流场中的单相及多相流动进行了仿真研究,提出了一些优化方案。更多还原

【Abstract】 A mathematic model of gas-liquid absorption and mass transfer with chemical reaction in a cyclonic absorber has been established according to different dynamical characteristics of the dispersed liquid phases in the swirling flow field based on the species mass-conversation equations in this thesis, witch is consistent with the Danckwerts’ Surface Renewal Theory. Not only considering the diffusive term and source term but also the transient and convective term, this model could explain the reaction process in a swirling field much more exactly.And according to this model, the transfer coefficient in liquid side k Lis proportionally to the square root of diffusion coefficient D and the square root of the renewal rate S , which had been proved by experiments approximately. Compared with other absorbers, the experimental results suggested that the cyclonic absorber, as simple and static equipment, could also supply a sound hydromechanical environment to intensify the process of mass transfer. All those work will give a theoretical fundamental for the further research on the application of the high absorption performance of the cyclone, such as desulphurization, air cleaning etc.Moreover, the Computational Fluid Dynamics (CFD) method was tried to simulate the single phase and multiphase flow in the cyclonic absorber and some optimization suggestions were but forward for further research.更多还原