VOCs流化床吸附过程中流场及吸附颗粒特性研究

VOCs gas with low concentration and large air volume has been a difficult problem for the treatment of gas end pollution. Combined with flow field test, experimental analysis and molecular simulation, this project developed cyclone fluidized bed technology and equipment with a higher adsorption efficiency. In this project, the laser particle image and flow field dynamics of the internal flow field in the swirling fluidized bed were simulated to obtain the regularity and velocity distribution of the flow field in the fluidized bed. The trajectories of the moving particles in the fluidized bed flow field were studied to obtain the typical laws of motion such as revolution, rotation and overturn. The relationship between the movement of adsorbed particles and the adsorption rate of VOCs and the influence of the movement of adsorbed particles on the migration of organic pollutants at the particle interface were investigated to design and structure VOCs swirl fluidized adsorption separation equipment. Testing the adsorption and transport of organic pollutants at the interface of different adsorbed particles and their overall VOCs adsorption capacity, the primary removal rate of VOCs was over 98% and formed a closed cycle treatment technology for high removal efficiency of VOCs with low concentration of industrial gas.

低浓度大风量的VOCs气体处理一直是气体末端污染治理的难点。本项目通过流场测试、实验测定、分子模拟等多种方法相结合，在传统的VOCs流化床吸附技术基础上开发一次吸附效率更高的旋流流化床工艺与设备。对旋流流化床内部流场进行激光粒子图像测试和流场动力学模拟，以获得流化床内部流场运动规律和速度分布规律；研究流化床流场中吸附颗粒的运动迁移轨迹，得到其公转、自转、翻转等典型运动规律，研究吸附颗粒运动变化和VOCs吸附率的关系，及其对颗粒界面有机污染物迁移的影响；设计并构建VOCs旋流流化吸附分离设备，测试不同吸附颗粒界面有机污染物传递吸附规律及其总体VOCs吸附能力，最终使VOCs一次去除率达到98%以上，并开发形成工业气体低浓度VOCs高效去除的密闭循环处理技术。

本项目通过流场测试、实验测定、分子模拟等多种方法相结合，在传统的VOCs流化床吸附技术基础上开发一种吸附效率更高的旋流流化床工艺与设备。利用激光粒子图像测试和流场动力学模拟分析旋流流化床内部颗粒运动特性，获得其内部流场运动规律和速度分布规律；利用高速摄像测试技术，建立旋流流化床内颗粒运动迁移分析系统，研究不同变量对吸附颗粒公转、自转、翻转等典型运动的影响规律；研究吸附颗粒运动变化和VOCs吸附率的关系及吸附颗粒运动变化对颗粒界面有机污染物迁移的影响；设计并构建VOCs旋流流化吸附分离设备，测试不同吸附颗粒界面有机污染物传递吸附规律及其总体VOCs吸附能力，最终使VOCs一次去除率达到98%以上，并开发形成工业气体低浓度VOCs高效去除的密闭循环处理技术。