Characteristics of three drum dryer

Three drum dryer is a rotating metal cylinder, with a thickness of 10 20 mm steel welded, drum diameter is generally 1 - 3 meters, length of 5 meters -20, ratio of length to diameter is 5-8; an inclined tube installation, the slope is 3~6%, the speed of about 2~5 rpm. It is equipped with a large gear wheel and simplified. With the help of tyre and tube rotary supporting roller in it. Wheel arranged at both sides of a pair of gear wheel, to indicate and limit the tilt cylinder along the direction of movement. The cylinder is driven by a gear. Because the cylinder has a certain degree of inclination and constantly rotating, Cause the material to move from the higher end of the cylinder to the lower end under the action of gravity and gradually dried by hot gas during the moving process. The holding time of the material in the dryer is about 20-40 minutes, and the connecting part of the cylinder and the mixing chamber and the dust collecting chamber is provided with a sealing device to prevent the air leakage.

In order to increase the contact area between the drying material and the hot gas flow, and raise the dry operation speed, the inner wall of the rotary barrel is provided with a lifting plate or a plate is arranged in the cylinder, and the utility model can be selected according to the nature and the pulling degree of the drying material.

Copy plate lifter is a kind of the most commonly used form, which in turn is welded on the inner wall of Jane type lifting plate. When the cylinder rotates, liftingplate bring the material to a certain height and falls the material and heat flow increases the contact area, drying speed is accelerated. The lifter plate copy structure simple. Convenient maintenance. The shortcoming is that the drying material is raised and the distance is large, which causes big t dust, high dust content of exhaust gas, and increases the burden of dust collecting equipment, and the stripper plate is easy to be damaged because of mutual collision. Straight lifting plate, suitable for drying Nirvana sticky material, such as clay etc.. Because the material is evenly distributed on the section of the cylinder, the driving power hinge is small, but the cleaning and the maintenance are difficult. The utility model is suitable for drying larger block materials, such as limestone, shale, etc..

Flow type drying machine is at the feed end and wet material of high temperature hot air flow and the air flow and the material flow in the same direction, the difference of temperature and humidity difference is very big, fast drying rate, and the discharge end of the material has been dried, the material temperature and the gas temperature is reduced, the drying rate is very slow, so in the drying cylinder in the bath rate is not uniform. Downstream type drying machine is suitable for the beginning of thousands of high moisture content, high temperature and not very small, suction port to export water requirements of larger materials. Counterflow drying machine is the gas and material reverse flow, the dried material and temperature, high heat holding gas containing low contact, so in the whole cylinder drying speed is relatively uniform. Because of the large mean temperature difference between the airflow and material during counter flow operation, the heat transfer rate is higher than that of the downstream flow. Most of the dry powder mortar and the mixing material dryer adopt direct heat transfer single cylinder downstream drying machine.

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Characteristics of three drum dryer

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