Dryer is a commonly used drying equipment, mainly used for drying materials, the purpose of drying is to use materials or further processing needs. China's dryer technology has gradually matured, and the market scale is also expanding. Today, Xiaobian mainly introduces the development of dryer, hoping to help users understand dryer products better.
  Modern drying machines began using intermittent fixed bed dryers. In the middle of nineteenth Century, the use of tunnel drier marked the development of drier from intermittent operation to continuous operation. Rotary cylinder dryer can better achieve the agitation of granular materials, and improve the drying ability and strength. Some industries have developed continuous operation dryers to meet the requirements of the industry, such as textile and paper industry drum dryers.
  In the early twentieth Century, the spray drying machine was applied in dairy production, which provided a powerful tool for large-scale drying liquid materials. In 40s, with the development of fluidization technology, boiling bed and airflow dryer with high intensity and high productivity appeared successively. The refrigerant sublimation, radiation and dielectric dryer provide a new means to meet the special requirements. In 60s, far-infrared and microwave dryers were developed.
  There are many types of mechanical equipment used for drying operations, according to the operating pressure can be divided into atmospheric pressure and vacuum dryer (vacuum dryer also known as). According to the operation method, it can be divided into intermittent and continuous. According to the drying medium, it can be divided into air, flue gas or other drying medium. According to the movement (material movement and drying medium flow), it can be divided into parallel flow, counterflow and cross flow.
  According to the operating pressure, the dryer is divided into two kinds, the normal pressure dryer and the vacuum dryer. The operation can reduce the pressure of the wet steam and accelerate the drying process under the vacuum. And it can reduce the boiling point of the wet and the drying temperature of the material, and the steam is not easy to take out. So the vacuum dryer is suitable for drying heat sensitive, oxidizing, explosive and available. Toxic materials and wet steam need to be recycled.