多级离心雾化超重力旋转填料床用亲水涂层丝网除雾沫的研究

发布时间：2018-04-26 06:14

  本文选题：雾沫夹带 + 亲水涂料　； 参考：《华南理工大学》2016年硕士论文

【摘要】：多级离心雾化超重力旋转填料床又称超重机、旋转填料床,自上世纪80年代以来已得到不断发展。超重力旋转填料床具有传热传质效率高、耗材少、体积小、结构简单、操作气阻小等优点,在许多方面都有应用,其中在液相传质方面,它常用作吸收和蒸馏塔设备。雾沫夹带是吸收塔中的一种常见的流体力学性能。在超重力旋转填料床设备中,大量微细雾沫的生成可以增大气液两相的传质面积,极大地强化气液间的传质,但在设备出口处的雾沫必须采用有效的方法清除干净,以免造成吸收剂的损失及环境污染。由于超重力旋转填料床出口气体除雾沫采用不锈钢丝网,其材质与空调铝箔材质类似,均为金属基材,故本文提出制备一种能浸涂在不锈钢丝网上的,能耐温耐腐蚀的具有亲水性能的涂层,增加除雾沫丝网对雾滴的捕捉能力,提高超重力旋转填料床对出口气体的除雾沫能力。本文在前人的基础上,首次提出以共聚单体丙烯酸羟丙酯HPA与亲水单体丙烯酸AA、丙烯酰胺AM进行三元共聚,选择合适的聚合方法、引发剂、交联剂、表面活性剂等及其用量,并分析单体配比、反应时间及温度、固化时间及温度等因素对产物接触角、附着力、耐水及耐温性能的影响。实验研究发现,本实验的最佳反应条件为:引发剂的量为0.1%,AA的摩尔用量为50%,反应时间为5 h,反应温度为30℃。综合该实验结果得到最优的反应条件,并测试在该条件下,产物的紫外、红外、接触角、附着力、硬度、表面形貌等多项性能。测试此时产物的接触角、TG/DSC及3D表面形貌等综合性能。最终将制备的涂层涂覆于不锈钢丝网上,并比较未涂覆与涂覆时及尼龙丝网的除雾效果,研究丝网种类、丝网层数、超重力旋转填料床转速及液体流量对旋转床除雾效果的影响。实验结果表明,涂覆了亲水涂层的不锈钢丝网除雾效果与尼龙丝网近似,采样板上雾滴直径明显减小,防雾效果较未涂覆时显著增强。
[Abstract]:Multi-stage centrifugal atomization rotating packed bed, also known as overweight machine, rotating packed bed, has been continuously developed since the eighties of last century. High gravity rotating packed bed has many advantages, such as high efficiency of heat and mass transfer, small consumption, small volume, simple structure and small operating resistance, etc. It is widely used in many aspects, especially in liquid phase mass transfer, it is often used as an absorption and distillation tower equipment. Entrainment is a common hydrodynamic property in absorber. In the high gravity rotating packed bed equipment, the formation of a large amount of fine foams can increase the mass transfer area of gas-liquid two phases and greatly enhance the mass transfer between gas and liquid, but the foam at the outlet of the equipment must be cleaned up by effective methods. Avoid loss of absorbent and environmental pollution. Since stainless steel wire mesh is used to remove mist at the outlet of high gravity rotating packed bed, which is similar to aluminum foil material for air conditioning, it is proposed in this paper to prepare a kind of material which can be immersed on stainless steel wire mesh. The coating with hydrophilic property which can resist temperature and corrosion increases the ability of droplet capture by defoaming screen and the ability of removing mist from outlet gas by high gravity rotating packed bed. On the basis of previous studies, the copolymerization of hydroxypropyl acrylate (HPA) with hydrophilic acrylic acid (AA) and acrylamide AM (AM) was proposed for the first time. The appropriate polymerization methods, initiators, crosslinkers, surfactants and their dosage were selected. The effects of monomer ratio, reaction time and temperature, curing time and temperature on the contact angle, adhesion, water resistance and temperature resistance of the product were analyzed. The experimental results show that the optimum reaction conditions are as follows: the amount of initiator is 0.1 and the molar amount of AA is 50, the reaction time is 5 hours, and the reaction temperature is 30 鈩，

本文编号：1804833