KJG Hollow paddle dryer for drying sludge

Working principle of Hollow Paddle Dryer:

Hollow paddle Dryer is a horizontal stirring and heat conduction type Drying Equipment 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 heat loss that took away by air flow and the use ratio of heat is improved, so it is a kind energy saving type drying equipment. Paddle dryer is widely used in environmental protection, petrochemical, chemical, metallurgy, foodstuff, pharmaceutical, pesticide industrials 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, Lead machinery 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.

Working principle of hollow paddle dryer

The heat transfer surfaces of hollow paddle dryer includes paddle, stirring shaft, and wall surface. And the heat transfer area of paddle is the great majority, so the structure of the equipment is compact and heat transfer area of unit volume is high. Stirring and mixing make the material turn over tempestuously so that the material can get high heat transfer coefficient, the occupied area and space is small and the plant capital cost is saved. Because the structure of paddle is special, during the drying period, material will be extruded and loosed, drying is strengthened. Loading ratio of drying chamber is high, it can be 80%-90%, drying time can be regulated from a few minutes to a few hours by regulating the feeding speed, the rotary speed of stirring shaft and the loading ratio. And from feeding port to discharging port the movement of material is basically piston motion. It residence time distribution is narrow, so the moisture of product is uniform. The paddle that on the stirring shaft has a certain axial direction angle, so it can dry material continuously.

KJG series Paddle Dryer is highly efficient, mechanically agitated, indirect heat transfer devices that add or remove heat from a process mass. They are used for drying, heating, cooling, pasteurization, crystallizing, and reacting of pastes, cakes, powders, and granules.
Dual counter-rotating shafts with unique intermeshing discs produce intimate mixing and optimize heat transfer. The use of hollow discs and drying chamber heating jacket for heat transfer results in a compact machine. The heat transfer medium: steam, hot water or hot oil is isolated from the process mass. The KJG series Paddle Dryer provides a reliable and efficient method for drying slurry, filter cakes and centrifuge concentrates.
The exhaust gases can be treated by cyclone, condenser and scrubber to considerably reduce air contamination. For those wet materials of heat sensitive, easy oxidized, containing organic solvents which need to be recovered, vacuum design is available.

Parameters of hollow paddle dryer