The design of the dryer is simple but the functions are diverse. The flash dryer can be used to dry various products, generally filter cakes. During pretreatment, the slurry will also be dried on a flash dryer. In a flash dryer, the wet material is dispersed into the dry air stream through one of the many types of feeding equipment supplied. When heat is transferred from the air stream to the particles, drying occurs within a few seconds. Because the flash dryer only removes surface moisture, the drying rate is constant throughout the drying stage. Separate the product from the air flow through the use of a high-efficiency cyclone separator, or in the case of fine products, separate the bag filter from the air flow; secondary air purification equipment, such as wet scrubbers or thermal oxidizers, ensure the required licensing Mandatory emission levels.
In order to improve the power, the flash dryer is generally planned to be a partially closed loop mode, and the exhaust gas is recirculated back into the furnace. Alternative heat sources such as turbine exhaust gas can be used to increase the energy output in the open circuit dryer, and the inlet temperature of the flash dryer can be as high as 1470°F (800°C). The flash dryer is used to dry wet materials, such as corn starch, and measure the materials to be dried into the hot air flow generated by an oil or gas heater; the product will be dried when transported along the dryer pipeline. The pipe ends in a cyclone separator or other group of separators, which removes dry products from the air stream, and can also use a two-stage separator such as a dust collector.
If the material processed by a process is combustible, the dust generated by it may be explosive. In the flash drying system, the processed material becomes more sensitive to incineration when it passes through the dryer and loses its moisture; dry products The incineration energy can be low enough to cause an incineration threat through electrostatic discharge. In addition, the material adhered to the wall of the dryer can absorb sufficient energy to recover; because of the pressure accumulation effect of the pipeline's geometric shape, the deflagration that occurs generates high flames and rapidly develops destructive pressure. Precautions for the protection system: The protection system of the flash dryer must provide a satisfactory inhibitor concentration throughout the process; in addition, if a cyclone separator is used, a lubricated inner wall is required to maintain the air separation power. The equipment has been continuously developed in continuous practice, and the same is true for flash dryers. After decades of research, we found that there are some shortcomings in the structure of the flash dryer.
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