Dehumidification dryers are used more and more frequently in the industry. Many people find that their drying efficiency gradually decreases after using the dehumidification dryer for a period of time, which has brought great troubles to consumers. If you want to improve the working efficiency of the desiccant dryer, you must first understand its operating principle. The dehumidification dryer mainly uses the running speed of the airflow to make the material particles move and change the running speed.

The relative movement of the particles and the airflow has a great influence on the heat transfer rate between the particles and the airflow. In the initial drying stage, the ascent speed of the particles is zero when they just enter the drying tube. speed.

        At this time, the convective heat transfer coefficient between the two phases is very large, and the material particles continue to accelerate and enter the accelerated drying stage. The heat obtained by the solid particles in the accelerated stage accounts for more than half of the heat obtained in the entire drying stage. In the later stage of drying, when the rising speed of the solid material approaches or even reaches the airflow speed, the convective heat transfer coefficient is greatly reduced, and the drying efficiency is reduced.

        In the drying process of the desiccant dryer, the relative speed of the gas-solid two phases is constantly changed, the turbulence intensity at the boundary layer around the particles is increased, the contact area of the gas-solid two phases is expanded as much as possible, and the contact time of the two phases is increased, which improves the drying efficiency. Effective measures.

        Dehumidifying dryers are generally used in industrial production to dehumidify and dry raw materials with strong hygroscopicity to ensure high product forming rates. In the past, companies used traditional hot air blowers. If it encounters wet weather, it is difficult for the hot air blowers to achieve the purpose of drying. The desiccant dryer came into being to improve the shortcomings of the hot air blower. So what is the difference between a dehumidifying dryer and an ordinary dryer? The following Sumitomo Precision Machinery technicians will answer for you.

1. Traditional hot air blower

        In order to evaporate the moisture in the material, the traditional hot air blower uses the hot air heated by electric heating to dry the material at a high temperature. However, due to weather factors, dry weather and humid weather, the moisture content in the air will be different, and the drying effect will also be different. In traditional hot air blowers, electric heating must first heat the incoming air. If the weather is too humid and the incoming air contains high moisture, it is difficult for the material to dry.

2. Dehumidifying dryer

       The dehumidification dryer effectively improves the shortcomings of ordinary dryers. It first draws in the ambient air to remove the moisture in the air under low dew point, and then heats the dried air to the dryer to dehumidify and dry the material. The work efficiency is greatly improved, the drying time is reduced, and the drying effect is better.

        The air pipeline of the desiccant dryer adopts a closed circulation system, which can not be affected by the external weather, and the material can be dried well in dry or humid days without reversing moisture. The filter installed in the desiccant dryer can prevent dust leakage from causing pollution in the factory and keep the air environment clean.

Generally speaking, the difference between these two dryers is the different moisture content of the inlet air used for drying. One has processed the inlet air moisture, and the other has not processed the inlet air moisture.