Vacuum packing machine operation about classification of drum dryers
Vacuum packing machine operation about classification of drum dryers. According to the number of drums divided into single drum, double drum (or drum, multi drum; According to operating pressure, it can be divided into atmospheric pressure and vacuum. According to the drum cloth film mode, can be divided into immersion type, splash type, on the drum gap adjustment type, roll type, top groove type, spray type and other types.
Vacuum packing machine operation about classification of drum dryers1. Double drum dryers with top slot type
The principle of double drum dryer with top groove is that the cast iron drum has a diameter of 0.6~0.9m and a length of 13m. The drum and its end baffle are of the same speed and the gap can be adjusted. Attached to each drum external circle with a scraper. Heated steam enters the drum from one end of the shaft of the drum. The saturated steam pressure can reach 600kPa and the temperature is 150℃. When working, the material liquid enters the top slot first, after the drum turns, the thin layer of liquid material will be taken out, through the surface of the drum, it will be heated and evaporated quickly, and continuously scrape off the dried flakes, fall into the conveying trough, and then conduct crushing, screening and packaging. The secondary steam generated by evaporation is discharged from the upper part of the drum, and the condensed water generated by heating steam is discharged from the bottom of the drum.
Vacuum packing machine operation about classification of drum dryers2. Spray type double drum dryers
Spray type double drum dryer working principle and process and top groove basically the same, the main difference is that the drum is equipped with nozzle, work on the surface of the drum spray a thin layer of material liquid. With this feed method, the heat utilization of the heating surface is up to 90 percent, while the top slot is less than 70 percent.
Vacuum packing machine operation about classification of drum dryers 3. Single drum dryers
Single drum dryer with bottom feed under normal pressure, used for drying materials with liquid or thin slurry suspension. Cloth membrane way often for immersion type or spray type, material of membrane thickness is 0.5 ~ 1.5 mm, tube is 0.2 ~ 0.6 MPa steam pressure in the cylinder with cast iron or steel plate welded, cylinder diameter is 0.6 ~ 1.6 m, length to diameter ratio L/D = 0.8 ~ 2.0, the barrel length of 3.5 m, scraper location with horizontal shaft Angle of 30 ° to 45 ° roller speed ~ 10 r/min, the transmission power of 2.8 kw ~ 14 cylinder heating medium in and out of the adoption of stuffing box sealed into QiTou structure within the tube condensate to siphon and use of steam pressure in the cylinder and the pressure difference between the trap, the continuously Out of the barrel. In addition to the normal pressure type structure, can also set up a closed cover for negative pressure operation.
Vacuum packing machine operation about classification of drum dryers 4. Double drum dryers
The double drum dryer is equipped with a set of reduction gear, which is engaged by a pair of gears with the same modulus and number of teeth. According to the position of the cloth film, divided into two types of rolling and groove. During film formation, the two cylinders are immersed in the same feed tank, and the thickness of the feed film is controlled by the gap between the two cylinders. Suitable for drying liquid, turbid liquid and other materials. The cylinder diameter of the double-drum dryer is small, generally 0.5~1.0m, length-diameter ratio L/D=1.5~2.0, transmission power is close to 2 times of the single drum, rotation speed, steam pressure and other operating conditions are the same as the single drum design. The discharging mode can be determined according to the feeding position: when upper feeding, the opposite roller with film thickness is controlled by the material weir, and a screw conveyor can be set up in the middle position of the bottom of the dryer to concentrate the discharging; The double drum dryer with lower feeding and the pair of roller dryer controlled by clearance are separately set up on the side of two sets of drums for discharging.
Vacuum packing machine operation about classification of drum dryers.
The double-drum drying machine operated by vacuum is placed in a closed cover with a complicated structure. This kind of dryer is generally used to recover solvent vapor with high value.