Exploration on the mechanism of dust escape during grab bucket bulk grain unloading process
In order to explore the mechanism of dust escape during the unloading process of grab buckets and solve the problem of severe dust escape during the current port material transportation process,an online testing experimental platform for the escape airflow of grab bucket unloading was built. A combination of experiments and numerical calculations was used to explore the mapping coupling relationship between the impact of unloading height and unloading mass flow rate on the escape airflow velocity inside the hopper by taking typical main grain particles as unloading objects based on the gas-solid two-phase flow theory,and derive the critical particle size for dust escape based on the motion characteristics and laws of the dust particle escape process. The research results indicate that the peak velocity of the escaping airflow is positively correlated with the unloading height.At the same unloading height,the peak value of the escaping airflow is in a power function relationship with the mass flow rate;Based on the force acting on powder particles,a formula for calculating the critical particle size of dust particles escaping is derived,and the calculation error of the formula is verified to be within 11％;Based on experimental data,the critical particle size ranges for dust particle escape during unloading of soybeans,corn,and wheat are 160.9～292.5,182.6～359.6,95.1～196.1μm.The research provides theoretical support for dust control and dust suppression device design in the process of grab bucket bulk grain unloading.
万方数据
维普
