Briefly describe the mechanical classification and structure of airflow dryers
2021-07-13 14:03:06
Mechanical sorting air dryer straight pipe flash dryer <br> <br> wet material from the feeder was added upstanding pipe, air is bubbled through the finned heater blower, heated to a certain temperature is blown into the upright tube, the speed of the inner tube It is determined by the size and density of the wet particles, which is generally greater than the sedimentation velocity of the particles (about 10 to 20 m/s). The dried particles are taken up by a strong air stream, sent to two parallel cyclones for separation, sent through a screw conveyor, and the exhaust gas is vented through a bag filter. Due to the short residence time, it is often necessary to use a two-stage or multi-stage series process for some products.
A type of cyclone airflow dryer for cyclone airflow dryers. The hot gas entrains the dried material particles into the cyclone dryer in a tangential direction, and generates a rotary motion along the hot wall, so that the material particles are in a state of suspension rotation and drying. The wall can be equipped with a steam jacket as needed. The drying process is greatly enhanced. In addition, since the particles are pulverized by the impact of the walls, the contact area of ​​the gas-solid phase is increased, and the drying process is also enhanced. It is especially suitable for heat-sensitive granular materials that are strong in water repellency and not afraid of pulverization. However, it is not applicable to materials with high water content, high viscosity, low melting point, easy sublimation explosion, and easy electrostatic effect.
Pulse Pulse <br> <br> air dryer air dryer is a flash dryer is. During the drying operation, the pipe diameter is alternately reduced or enlarged, so that the gas flow and the particles flow at different speeds, and the relative velocity and heat transfer area between the gas flow and the particles are large, thereby enhancing the heat and mass transfer rate. In addition, the air flow rate in the enlarged tube is greatly reduced, which in turn increases the drying time accordingly.
The structure of the airflow dryer is directly fed. It is a widely used one of the current applications, and is suitable for the occasion where the wet material has good dispersibility and only removes surface moisture. Such as dry synthetic resins, certain pharmaceuticals, organic chemical products, coal, starch and flour. If the wet material has a high water content and is easily agglomerated during feeding, a part of the dried product can be used as a return material, and mixed with the wet material in the mixing feeder to facilitate the drying operation.
A gas flow drying device with a disperser with a disperser, and a squirrel cage disperser underneath the drying tube to disperse the material. It is suitable for bulk materials with low water content and good looseness, such as filter cake of centrifuge and filter, as well as phosphogypsum, calcium carbonate, sodium fluorosilicate, clay, coffee grounds, sludge residue, corn residue, etc. .
The airflow drying device with the pulverizer device and the pulverizer is equipped with an impact hammer mill under the airflow drying pipe for pulverizing the wet material, reducing the particle size, increasing the surface area of ​​the material, and strengthening the drying. Therefore, a large amount of water is evaporated during the pulverization process, and in general, 80% of the vaporized water content can be completed. In this way, it is convenient to adopt a higher intake air humidity to obtain a large production capacity and high heat transfer efficiency.
A type of cyclone airflow dryer for cyclone airflow dryers. The hot gas entrains the dried material particles into the cyclone dryer in a tangential direction, and generates a rotary motion along the hot wall, so that the material particles are in a state of suspension rotation and drying. The wall can be equipped with a steam jacket as needed. The drying process is greatly enhanced. In addition, since the particles are pulverized by the impact of the walls, the contact area of ​​the gas-solid phase is increased, and the drying process is also enhanced. It is especially suitable for heat-sensitive granular materials that are strong in water repellency and not afraid of pulverization. However, it is not applicable to materials with high water content, high viscosity, low melting point, easy sublimation explosion, and easy electrostatic effect.
Pulse Pulse <br> <br> air dryer air dryer is a flash dryer is. During the drying operation, the pipe diameter is alternately reduced or enlarged, so that the gas flow and the particles flow at different speeds, and the relative velocity and heat transfer area between the gas flow and the particles are large, thereby enhancing the heat and mass transfer rate. In addition, the air flow rate in the enlarged tube is greatly reduced, which in turn increases the drying time accordingly.
The structure of the airflow dryer is directly fed. It is a widely used one of the current applications, and is suitable for the occasion where the wet material has good dispersibility and only removes surface moisture. Such as dry synthetic resins, certain pharmaceuticals, organic chemical products, coal, starch and flour. If the wet material has a high water content and is easily agglomerated during feeding, a part of the dried product can be used as a return material, and mixed with the wet material in the mixing feeder to facilitate the drying operation.
A gas flow drying device with a disperser with a disperser, and a squirrel cage disperser underneath the drying tube to disperse the material. It is suitable for bulk materials with low water content and good looseness, such as filter cake of centrifuge and filter, as well as phosphogypsum, calcium carbonate, sodium fluorosilicate, clay, coffee grounds, sludge residue, corn residue, etc. .
The airflow drying device with the pulverizer device and the pulverizer is equipped with an impact hammer mill under the airflow drying pipe for pulverizing the wet material, reducing the particle size, increasing the surface area of ​​the material, and strengthening the drying. Therefore, a large amount of water is evaporated during the pulverization process, and in general, 80% of the vaporized water content can be completed. In this way, it is convenient to adopt a higher intake air humidity to obtain a large production capacity and high heat transfer efficiency.
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