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Double Drum Dryer Feeding Way
Sep 08, 2017

The number of drum can be divided into single drum, double drum and multi-drum dryer; According to the operation pressure can be divided into the normal pressure type and the vacuum type two kinds; The film can be divided into top feed, immersed liquid and spray dryer. A single drum dryer is a machine which can complete the drying operation by a roller. The composition of the dryer is described above. The main parts of the dryer are the drum, the drum is a hollow metal cylinder, the cylinder body is welded with cast iron or steel plate, and the drum used for food production is usually welded with stainless steel.

The diameter of the drum is 0.6 ~ 1.6 m, and the diameter ratio (L/D) = 0.8 ~ 2.

The material of the material in the form of material can be used in the material of the top entry or the method of dipping, spraying, etc. The thickness of the material on the drum is 0.5 ~ 1.5mm.

Most of them adopt steam heating medium, steam pressure of 200 ~ 200 kpa, roller outer wall temperature is 120 ~ 150 ℃.

The driving mechanism driving the drum is the stepless speed regulating mechanism, and the rotating speed of the drum is generally 4 ~ 10r/min.

The material being dried, from the drum scraper by scraping, the position of the scraper depending on the material import location, drum section in general Ⅲ, Ⅳ quadrant, and horizontal axis Angle of 30 ° to 45 °. Drum of import and export of heating medium, the use of ptfe sealing ring seal, the condensed water inside the drum, to siphon and use the drum steam pressure and the pressure difference between the trap, the continuous eduction tube outside. Double drum dryer is refers to the drying machine by the two rollers and complete dry mechanical operation, two drum dryer by the same set of reduction gear, the same module and a pair of gear meshing teeth make two groups of the same diameter roller relatively rotation and operation. The two drum dryer can be divided into two types: roll type and groove type.

For rolling double drum dryer, there are two middle grooves in the middle of the feeding liquid. The gap between the two cylinders is controlled by a pair of circular diameters with the diameter of the cylinder or a similar meshing wheel, generally within the range of 0.5 ~ LMM, and no leakage of material is allowed. The rotation direction can be determined according to the actual and equipment layout of the material. When the drum is rotating and the bite is in the end of the feed liquid, the thickness of the material film is controlled by the gap between the two cylinders. When the Angle of the bite is in reverse, the film thickness between the two cylinders is controlled by the gap between the weir plate and the tube in the direction of the length of the tube. This type of dryer is suitable for drying with precipitated slurry material or high viscosity material.

Same groove type double drum dryer. The gap between the two groups is larger, and the pitch diameter of the relative meshing gear is greater than that of the cylinder. When feeding, the two tubes are immersed in the same feeding trough, and the membrane is relatively rotational and non-interference. It is suitable for drying of materials such as solution and emulsion.

The drum diameter of double drum dryer is generally 0.5 ~ 2m; Long diameter ratio (L/D) = 1.5 ~ 2. The operating conditions of steam pressure and other operating conditions are the same as that of single drum dryer, but the transmission power is about twice as high as the single drum. Double drum dryer feed way and the single drum dryer is different, if the upper feed, by the thickness of film of weir control material of two drum dryer, can be in the middle of the dry bottom position, set up a spiral conveyer machine, concentrated discharge. In the lower feed rolling double drum dryer, the material device is set separately on the side of the two groups of drums. Vacuum drum dryer is a vacuum chamber that is sealed in a vacuum chamber. Roller dryer under vacuum condition, can greatly improve the heat transfer coefficient, such as temperature of 121 ℃ in the drum (i.e., 0.2 MPa steam pressure), 870 kpa vacuum conditions in operation, the heat transfer coefficient is under atmospheric pressure operation of 2 ~ 2.5 times. However, due to the complicated structure of the vacuum drum dryer, the drying cost is high, so it is only limited to the drying of materials such as fruit juice, yeast, baby food and so on