KJG Series Oar Dryer / Hollow Paddle Dryer
Application
Hollow paddle dryer is a horizontal stirring and heat conduction type drying equpment that can work continuously. Its stirring blade is like ship paddle, so it is called paddle dryer. In foreign countries, it is also called slot dryer or stirring dryer.
Needed heat of the dryer relies on heat conduction to heat indirectly, so during the drying period it doesn't need air or little air to take the moisture away. It greatly reduces the hat loss that took away by air flow and the use ratio of heat is improved, so it is a kind energy saving type drying equpment. Paddle dryer is widely used in petrochemical, chemical, metallurgy, foodstuff, pharmaceutical, pesticide in dustries and so on for drying powder, granules, filter cake and seriflux materials.
On the basis of a wide research, absorption and digestion of domestic and foreign advanced technology, our company improved and optimal designed the wedge hollow paddle dryer. It can indirectly heat or cool paste shape, granules, powder and seriflux materials. It can achieve the operation of drying, cooling, heating, sterilization, reaction and low temperature calcinations, etc. In the equipment, the wedge-shape stirring and heat transfer paddle has high heat transfer efficiency and the heat transfer surface self-clean function.
Structure
Take double shafts type for example to introduce the structure (paddle dryers include single shaft, double shafts, and four shafts). It consists of W-shape shell with jecket, upper cover, two hollow shafts with paddles, covers of two ends, swivel hoint, flexible metal tubing and transmission mechanism that including gears and chain wheel, etc.
The cores of the equipment are the two hollow shafts and the hollow paddles welded on the shafts. The shape of paddle is wedge-shape hollow hemicycle, inside it can be input heating medium. Except the stirring function, it also is the heat transfer device. Two main heat transfer surfaces of paddle are slope surfaces. When material contacts with the slope surface, granules will slip away from the slope surface with the rotary of paddle. It can make the heat transfer is renewed continuously, so the heat transfer is strenthened. At the triangle bottom of paddle there is scraper blade, it can sweep the material that deposits at the bottom, so it can avoid the dead corner.
There are some requirements for the distribution of paddle and the size of its each part. And at the feeding area, drying area and discharging area, there are not only paddles but also complementary unit, it can ensure the machine works stably, and dry uniformly. Moreover, residence time can be regulated.
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