Wuxishi Da Tang Drying Equipment Factory
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Flash Drier Flowing Airflow
- Aug 01, 2017 -

 The airflow required for the production of the air-operated rotary flash dryer is fed into the furnace by the blower. The air is heated and divided into two streams. Flash Drier The airflow enters the dryer from the bottom side of the dryer to form a high-speed and low-pressure rotary spout. While the other stream from the bottom of the flash dryer into the center of the air flow rotary flash dryer to form a flow of air. Material by the screw feeder into the drying cylinder down with two air flow meet, the heat transfer process, the gradual removal of water, the material is dry.

Flash dryer exhaust gas by the cyclone, Flash Drier bag separator two gas-solid separation, the exhaust fan will be exhausted to the atmosphere, and products were cyclone separator, Flash Drier bag separator at the bottom of the star unloader To the product storage tank. Rotating air flow transport drying smaller particles suspended in the rotating air flow, driven by the rotating air was spiral up, Flash Drier under the action of the rotating force field, the particles and the air flow between the larger relative velocity, so that the heat transfer mass coefficient increased again. Flash Drier At the same time, the larger particles in the centrifugal force, Flash Drier and the center of the rapid flow of low pressure, so that the size of different particles along the dryer at different locations were spiral floating fluidization, Flash Drier large particles close to the cylinder wall, with the wall friction,Flash Drier  Further micronized, fine particles continue to flip, reducing the critical water content, shortening the internal water to the surface diffusion distance, which still maintain a large drying rate, remove part of the material combined with water.

As the fine particles along the helix movement, increasing the material and hot air contact time, in order to remove the combined moisture to create favorable conditions. The airflow rotary flash dryer is flashing quickly, and the dry wet material enters the dryer through a screw feeder, Flash Drier and the small particles are swirling with the rotating hot air stream and the larger particles are descending. The relative mass of the solid particles and the hot air flow increases, and the heat and mass transfer coefficient increases with the increase of the wet mass, and the dry mass is collapsing, shearing and breaking under the action of the tangential hot air , Flash Drier So as to achieve micronization.

Airflow rotary flash dryer on the one hand to reduce the diffusion of water in the material distance, on the other hand also increased the gas - solid contact area, is conducive to moisture in the material vaporization. In the larger cone, the descending velocity of some particles is still greater than the settling velocity and continues to fall. Flash Drier In the inverted conical space, the velocity gradient of the hot air is established (the velocity is gradually reduced from bottom to bottom and finally becomes the value) The lower part of the large particles and the upper part of the small particles are in fluidized state, so that the material flow drying, to speed up the removal of water.

When the larger particles fall near the bottom of the gap, Flash Drier the dry activity area of the flash dryer with the high temperature, the high-speed negative pressure airflow and the eddy current fluidization drying in the bottom gap is very thin and is rotated in the vicinity of the furnace wall The air flow rate is very high, and the airflow at the center of the drying chamber is very low, it is difficult to bring the granular material out of the drying room. Therefore, in the center of the bottom of the device to install a central riser, Flash Drier on the one hand to increase the degree of turbulence, on the other hand will be dry after the fine particles side turbulent side up to eliminate the original equipment "dead zone" to strengthen the central area of dry, Flash Drier And the particulate material smoothly out of the dryer, thereby increasing the material production, that is, air drying area.