【摘要】 针对土壤中石油烃污染的脱附,采用计算模拟方法对污染土壤颗粒的运动状态与脱附关系进行了研究。结果表明,颗粒中污染物的脱附效果与其运动状态有关,脱附效果由低至高排序为颗粒静止<直线运动<螺旋运动,且颗粒做螺旋运动对污染物的脱附较其他运动状态更为均匀;螺旋运动的脱附效果与旋向无关,但与运动圈数有关,单位时间内螺旋运动的圈数越多,颗粒的脱附效果越好。基于上述结果,设计了一种管式涡流结构以期实现颗粒的螺旋运动,实现了土壤颗粒中石油烃污染物的强化脱附。利用Fluent模拟了不同管式涡流结构的流体流动形态及颗粒运动轨迹,发现螺旋叶片的旋向能够调控颗粒的运动旋向,螺旋叶片的导程能够调控颗粒的运动圈数。更多还原

【Abstract】 In this study, the CFD software Fluent was used to study the relationship between the motion status and desorption efficiency of petroleum hydrocarbon contaminated soil particles. The results showed that the pollutant desorption efficiency was related to particle motion status, and the desorption efficiency ranked in ascending order as stationary<linear motion<spiral motion. The desorption effect created by spiral motion status was more evenly around the particle than that by other motions. The desorption effect of particles in spiral motion was independent of the direction of rotation but related to the number of revolving circles. The more the number of turns of spiral motion, the better the desorption effect of particles. Based on these findings, a tube with spiral fans was designed to create the spiral motion of particles to achieve the enhanced desorption of pollutants. Fluent was used to simulate the fluid flow patterns and particle motions trajectory of different spiral structures. It was found that the rotating direction and the lead of the spiral fans could regulate the direction and number of revolving circle of particles, respectively.更多还原