Abstract:

In order to solve the problem of uneven drying of the side-entry salt mud drying room,the structure was improved by numerical simulation and experimental research.Standard k-ε model and porous medium model were used to simulate the airflow field of the drying chamber,the wind speed and moisture content of dried salt mud were measured,and the drying chamber structure was improved based on the simulation results.The results indicated that the source of power for the hot air flow in the drying room of the original structure mainly depended on the initial velocity,flowed and diffused in the drying chamber and generated various disturbances,the coefficient of uneven airflow was large,and the moisture content of the salt mud after drying was high and uneven;the pressure gradient formed inside the drying chamber after the improved structure became the driving force for the hot air flow,which made the hot air moved upward through the salt mud layer.After the structure was improved,the coefficient of uneven air flow was small,and the moisture content of the dried salt mud was low and relatively uniform.Compared with the original structure,the uneven coefficient of airflow decreased by at least 27.6%,the moisture content of the dried salt mud decreased by 4.48%,and the uneven coefficient of water content decreased by 8.4%.

Key words: salt mud, dryer, flow field, numerical simulation, coefficient of unevenness