Scraper drum dryer

Process Brief Description

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The mixed master liquor is sent to the feed pipe of the scraper drum dryer through the feed pump, and the amount of liquid is controlled through the valve. At the same time, it circulates continuously to ensure that the master liquor will not crystallize and separate out. The collected master liquor in the feed tank flows back to the buffer tank through the reflux port.

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The scraper drum dryer continuously supplies hot steam to heat the salt water film on the surface of the cylinder. After the water evaporates, the material on the surface of the cylinder is scraped off by a scraper and transported to the next process through a spiral. The condensate water generated by the condensation of the drum drying heat source is discharged to the condensate water return pipeline through the rotary joint and drain valve.

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The water vapor and a small amount of salt particles produced by the drum dryer are washed by the wet dust collector and then discharged. During the entire exhaust process, the negative pressure state of the system is ensured through the induced draft fan at the rear, and the exhaust gas is washed and discharged before being discharged.

Equipment Technical Advantages

High drying rate

High drying rate: Since the material film applied to the cylinder wall by the paint is very thin and the heat and mass transfer directions are consistent, the evaporation intensity on the surface of the material film can be as high as 200kg.H2O/m2.h, which is hundreds of times higher than ordinary domestic scraper dryers. More than fifty percent.

Flexible operation

Many drying factors of the tumble dryer can be adjusted. Such as the concentration of the feed, the concentration of the paint, the thickness of the paint film, the temperature of the heating medium, the rotation speed of the drum, etc., can all change the drying efficiency of the drum dryer, and many factors are independent of each other. This brings great convenience to the drum drying operation, allowing it to adapt to the drying of a variety of materials and different output requirements.

High thermal efficiency

Because the heat transfer mechanism of the drum dryer is thermal conduction, the heat transfer direction remains consistent throughout the entire operating cycle. Except for the end cover heat dissipation and thermal radiation losses, all the remaining heat is used for evaporation of moisture in the barrel film, and the thermal efficiency can reach 70 %-80%.

Short drying time

The drying cycle of materials is generally only 10-300 seconds, which is suitable for heat-sensitive materials. If the drum dryer is installed in a vacuum, it can be operated under reduced pressure.

Scope of Application

Ammonium sulfate master liquor | Sodium sulfate master liquor | Sodium chloride master liquor | Various mixed enrichment master liquors