Optimization Design, Numerical Simulation And Experimental Research Of Box Drying Device Based On Geometric Structure

Drying is a high energy consumption process, which involves broad fields of national economy, drying energy consumption accounted for 7%-15% of the total energy consumption in most developed countries and thermal efficiency of drying industry is generally not high, only 25%-50%, most of the energy is wasted, the energy consumption accounts for about 12% of the total energy consumption of National economy.Due to the advantages of simple structure,low cost and convenient maintenance,the drying cabinet is still widely used in drying industry. However, the drying cabinet has the disadvantages of internal air flow distribution is not uniform, in order to overcome the uneven distribution of air flow in the organization. This paper adopts CFD technology, from two aspects, on the one hand, based on the geometrical structure,consider the influence of internal airflow distribution by the position of the air inlet and outlet position, static pressure box and the tilt angle of the box through simulation studies, on the other hand, study different air supply conditions (three kinds of velocity and three kinds of temperature) affect the internal airflow distribution of the drying cabinet.In this paper, in order to improve the velocity and temperature distribution in drying cabinet, factors which affecting the airflow distribution of the drying cabinet are considerated in terms of the structure (static pressure box,variable cross-section,inclination angle, the positions of the air inlet and outlet), seven kinds of different shape drying cabinet is designed by the Gambit, and simulated and calculated by Fluent, then imported the images which obtained from the Fluent into Tecplot. The results of simulation show that the static pressure box is helpful to airflow distribution,and when the variable cross-section tilt angle is 4 degrees, the inlet velocity is 2m/s,the heat exchange area average wind speed reach 0.76m/s, velocity field and temperature field distribution is uniform, in addition, the positions of the air inlet and outlet also have an impact on the airflow distribution of drying cabinet. Furthermore,the effects of different inlet velocities (lm/s, 2m/s and 3m/s) and different inlet temperatures (313K, 323K, and 333K) on the internal flow field in the newly designed dryer were studied. The results show that the airflow distribution in the drying cabinet is the most uniform in the newly designed when the inlet velocity is 2m/s and the temperature is 323K.According to the numerical simulation results,wo have a test of the no-load and load fig, the dates of velocity and temperature were collected and analyzed through the actual operation experiment parameters, and compared with numerical simulation results, their change trends were consistent basically, the new design of the drying cabinet can improve the uneven distribution very well, which can have certain guidance and reference value to drying cabinet design and promotion.