The difference between double cone rotary vacuum dryer and conical spiral belt vacuum dryer

From the development of vacuum drying equipment, its mode and operating status are similar, but different operating modes reflect different application effects. During the development and improvement process, the form of the dryer has also undergone different changes. Today, we will talk about how to achieve the actual performance of the dryer using low-temperature continuous working mode, and describe its advantages in detail from various directions. The low-temperature continuity of the vacuum dryer preserves the high-quality ingredients of the raw materials, ensuring a good appearance and ensuring the quality of food, drugs, and other products. It fully utilizes the advantages of the entire processing process and greatly reduces production costs, bringing favorable development to the enterprise. Moreover, this production process has great advantages for freeze-drying, It alleviates the defects in such production and processing, effectively improving the stability of batch production. So the use of vacuum dryers has been highly praised in many enterprises. Its practical effects have expanded its influence and provided effective methods for the production and processing of various products, ensuring the stability and reliability of product quality. This is the innovative advantage that dryers bring to enterprises, not only increasing the added value of products, but also injecting good production conditions. The double cone rotary vacuum dryer is a widely used equipment in the production of raw materials. This is because during the vacuum drying process, the pressure inside the cylinder is always lower than atmospheric pressure, with fewer gas molecules, low density, and low oxygen content. Therefore, the double cone rotary vacuum dryer can dry drugs with easily oxidizing changes and reduce the chances of material contamination. Due to the fact that the temperature of water during the vaporization process is directly proportional to the steam pressure, the water in the material can be vaporized at low temperatures during vacuum drying with a double cone rotary vacuum dryer, achieving low-temperature drying. It is particularly suitable for the production of heat sensitive materials in pharmaceuticals. At the same time, the double cone rotary vacuum dryer vacuum drying can eliminate the surface hardening phenomenon that is prone to occur during atmospheric hot air drying. This is due to the large pressure difference between the inside and surface of the vacuum dried material. Under the action of pressure gradient, water quickly moves towards the surface without surface hardening. In addition, during vacuum drying, the temperature gradient between the inside and outside of the material in the double cone rotary vacuum dryer is small, and the reverse osmosis allows the solvent to move and collect independently, effectively overcoming the phenomenon of solvent dispersion caused by hot air drying. From a functional perspective, the double cone rotary vacuum dryer is a drying equipment that integrates mixing and vacuum drying. The double cone rotary vacuum dryer is widely used as a classic equipment due to its simplicity, convenience, and dual effects. It has practicality and economy, and is difficult to replace by other equipment. The double cone rotary vacuum dryer has been continuously improved and has produced multiple variants through targeted and adaptive improvements. The improvement of the sealing mechanism of the double cone rotary vacuum dryer ensures effective and safe shaft sealing. In practical applications, due to the different characteristics of raw materials produced by different manufacturers, their process flow is also different. At present, there are two typical processes for double cone rotary vacuum dryers based on their heating methods and solvent recovery conditions: (1) steam heating, without the need for solvent recovery process; (2) Hot water heating and solvent recovery. Normally, the rotation speed of the double cone rotary vacuum dryer cylinder is directly proportional to the drying speed. But in the later stage of drying, as the moisture content of the material decreases, the drying speed also decreases, and increasing the speed at this time is not profitable. In addition, in the early stages of drying, a faster rotation speed can easily cause the phenomenon of excessive moisture vaporization and material bonding into clusters. The double cone rotary vacuum dryer requires convective heat exchange and provides heat and cooling capacity respectively, so there will be a double cycle of water and fire inside the jacket. The conical spiral belt vacuum dryer is a fully enclosed vertical vacuum drying equipment that combines drying and powder mixing. Its main structure is a vertical cone, with a screw stirrer inside and a discharge valve at the lower end. The conical spiral belt vacuum dryer is very suitable for powder drying in industries such as chemical, pharmaceutical, food, pesticide, etc. It can achieve a closed drying operation throughout the entire process. The drying efficiency of the conical spiral belt vacuum dryer is about three times that of the double cone rotary vacuum dryer. This is related to the mechanism design of both. The spiral belt of the conical spiral belt vacuum dryer can be designed as hollow to increase the heat transfer area. Its overall heat transfer area is larger than that of the double cone rotary vacuum dryer. Moreover, the conical spiral belt vacuum dryer adopts a stirring forced mixing drying design, which makes the improvement of drying efficiency more obvious.