① structure of the flash dryer.
Flash Drying is a vertical fluidized bed dryer with a rotary shredding unit that can simultaneously perform operations such as drying, crushing, and classification of materials. The main body of the equipment is a cylindrical drying chamber, which consists of a crushing and fluidizing section at the bottom, a drying section at the middle part and a top classification section. The bottom crushing section is equipped with a stirrer, and the agitator speed is stepless regulated by an external motor. The stirrer has two functions to drive the hot air entering the drying chamber from the distribution chamber to produce a high-speed rotating air flow to form a fluidized bed. In addition, the material produces a strong mixing and grinding effect, enhanced heat and mass transfer, speed up the drying rate of the material. In the bottom of the dryer with volute-type air distribution room, so that the tangential to the hot air into the annular guide gap even into the drying room. In the drying section with a screw feeder, feeder by the governor motor drag, adjust the speed through the inverter, the top of the grading section has a grading ring, according to the size of the product requirements to replace the corresponding grading ring diameter.

② flash drying principle.
According to the structure of the flash dryer, the working process can be divided into four stages, such as crushing, gas-solid contact, drying, grading, etc. The four working processes can not be provided by other dryers at the same time.

③ broken.
As the flash dryer is mainly used for drying pasty materials, materials into the dryer immediately after the impeller and high-speed air flow by the broken, in order to maximize the dispersion of the material and the wetting of the material per unit area of the specific surface area.

④ gas-solid mixing and drying.
Generally, wet air is the heat carrier of the flash dryer, and whether the gas-solid mixing is effective is the main factor affecting the drying rate. The impeller of the flash dryer dries the material and disperses, and the air entering the dryer is in a high turbulence state. At the same time, the block material under the gravity down down, because the bottom of the dryer for the inverted cone structure, the high speed of air flow, up to 60m / s, to ensure that the bulk material in a good fluid state by hot air Surrounded.

⑤ grading stage.
The classifier is the annular baffle installed in the top of the dryer, the material with the air flow, due to the role of centrifugal force, large, dry material by centrifugal force rotation radius increases, when the radius of rotation is greater than grading ring radius Drying chamber, until you meet the requirements to be discharged through the classifier dryer. When the material is added to the dryer, the material is in a rotating fluidized state. After crushing, the diameter of the agglomerate is rapidly reduced and the moisture is evaporated. Materials in the gas entrainment for the spiral movement, the smaller diameter of the dry material in the inner ring, the larger the wet material generated centrifugal force in the outer layer near the wall. But the outer layer of large particles continue to be crushed and dried, centrifugal force is also smaller after the movement to the inner ring, when the water meets the requirements after the gas out of any section in the drying chamber pressure changes.

⑥ flash dryer structure characteristics.
The bottom of the drying chamber is provided with an inverted conical structure, so that the circulating cross section of the hot air is expanded from bottom to top and the bottom gas velocity is large and the upper gas velocity is small. The inverted cone structure also reduces the length of the cantilever of the agitator shaft and increases the reliability of the operation. Bearings in the machine, to avoid long-term work in the high-temperature bearings, extended bearing life.