Comparative analysis of drying equipment

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1 Tubular dryer 2 High-speed stirring dryer 3 Rotating flash dryer. In terms of the quality of dried products, high-speed stirring dryers are the best, followed by rotary flash dryers and tubular dryers. In terms of the cost of dried products, tubular dryers have the lowest cost, followed by high-speed agitated dryers and rotary flash dryers. Tubular dryers use steam as a heat source, while the other dryers utilize mechanical grate coal-fired hot air furnaces or manually fueled hot air furnaces. Tubular dryer systems have a simple composition but a complex structure with numerous maintenance points, while high-speed mixing dryers and rotary flash dryers have a simple structure and are relatively easy to maintain. Although tube bundle dryers are characterized by high efficiency, they have difficulty handling materials with high viscosity. For such materials, a backmixing process must be used, involving the addition of large amounts of dry material to the wet material in order to reduce its viscosity. As a result, the efficiency of tube bundle dryers in this type of drying process is relatively low; the water removal capacity drops from 4–5 kg of water per M2·hour when dealing with normal materials to 3–3.5 kg of water per M2·hour. Therefore, nowadays most manufacturers rarely choose tube bundle dryers when selecting drying equipment. Tubular dryers are currently mainly used for drying materials such as germ, fibers, and distillers’ grains. Rotary flash dryers must be specially designed; they are not generic. Generic rotary flash dryers require corresponding modifications, otherwise the drying effect will be poor. The high-speed stirring dryer is a new type of drying equipment developed by us, designed primarily for drying materials with high viscosity and high humidity. China’s first dryer was of this high-speed stirring type. This type of equipment produces products of high quality, has a simple structure, and is easy to repair and maintain.