The third type of particle grading.

Most existing research uses experimental designs for testing, which cannot efficiently analyse the migration and sorting rules of particles in the disturbed slurry. Therefore, based on the fluidized bed flow film theory, a slurry flow film structure system is established according to the disturbance state of the fluid. On this basis, the particle size and distribution law of the disturbing force formed by slurry disturbance are analyzed, and the calculation model of single particle lift in the flowing film is also analyzed. On this basis, using Markov probability model, the probability of particle lifting and sorting between layers is theoretically deduced. Then, according to the particle ratio of the original mud, the settlement gradation of the particles in the disturbance is analyzed. It can also predict the separation degree of particle in natural turbulence, fluidized beds, and sludge mechanical dewatering. Finally, according to the particle flow software PFC (Particle Flow Code), the main influencing parameters (disturbing force and gradation) were verified and analyzed. The results show that the particle flow simulation results are in good agreement with the calculation results. The model of slurry membrane separation proposed in this paper can provide a basis for studying the mechanism of slurry disturbance separation and particle deposition.

现有多数研究多采用实验设计开展测试，却无法高效解析受扰浆液中颗粒的运移与分选规律。据此，本文基于流化床流膜理论，结合流体的扰动状态构建了浆液流膜结构体系。在此基础上，分析了浆液扰动所形成扰动力的粒径分布规律，并对流膜内单颗粒升力的计算模型开展了分析。进一步基于马尔可夫概率模型，从理论层面推导了颗粒在层间的升运与分选概率。随后结合原泥浆的颗粒配比，分析了扰动工况下颗粒的沉降级配特征。该体系还可预测自然湍流、流化床及污泥机械脱水场景中的颗粒分离度。最后，借助颗粒流软件PFC（Particle Flow Code），对扰动力、级配等核心影响参数开展了验证与分析。结果表明，颗粒流模拟结果与理论计算结果吻合度良好。本文所提出的浆液膜分离模型，可为研究浆液扰动分选机制与颗粒沉积规律提供理论支撑。