There are several kinds of sludge dryers in the market

According to the contact mode between sludge and hot air, sludge dryer can be divided into direct sludge dryer and indirect sludge dryer. The direct sludge dryer is to directly contact the hot gas with the sludge, so as to heat the sludge and evaporate the water in the sludge. The heat from the sludge is not transferred to the water through the hot air heater.

On the market, the sludge dryer can be divided into: fluidized bed sludge dryer, disc sludge dryer, belt type sludge dryer, paddle type sludge dryer, roller type sludge dryer, spray dryer, Guan Shu dryer, air drier and so on.

Fluidized bed sludge dryer

Fluidized bed sludge dryer belongs to direct heating drying. Its drying process: the bulk sludge is placed on the orifice plate, and the heat is transferred to the lower part, which causes the sludge particles to move on the distribution plate, and is suspended under the action of hot air flow, so that the sludge is mixed and contacted with the heat air flow, just like the liquid boiling, which speeds up the evaporation of water in the sludge. More common are vibration fluidized bed dryer, agitated fluidized bed dryer, centrifugal fluidized bed dryer and so on.

Disc sludge dryer

Disc sludge dryer belongs to indirect heating drying. The equipment mainly consists of jacket, single shaft rotor and transmission device. After the sludge enters the dryer, the hot air passes through the jacket, hollow shaft and the hollow disc welded on the shaft, and the sludge contacts, heats and dries indirectly. The disc does not cut the sludge, but continuously agitates the sludge through the impelling agitator at the edge of the disc to update the drying surface, so as to realize the drying of sludge.

Belt type sludge dryer

The belt type sludge dryer can be directly heated to dry. Its working principle: after entering the equipment, the sludge is distributed on the conveyor belt, and the conveyor belt passes through a channel composed of one or several heating units. When the conveyor belt passes through, the hot air carries out heat transfer from top to bottom or from bottom to top through the sludge on the conveyor belt, so as to realize the purpose of sludge drying.

Paddle type sludge dryer

Paddle type sludge dryer belongs to indirect heating drying. Its working principle: the equipment mainly has jacket. It is composed of double shaft or four shaft wedge blade and transmission device. The sludge is also heat conduction by jacket, hollow shaft and hollow blade welded on the shaft to realize sludge drying. The wedge-shaped blade continuously cuts and stirs the sludge to renew the drying surface.

Drum type sludge dryer

Drum type sludge dryer belongs to direct to heating drying. The market is divided into single drum and three drum. The single drum is composed of a cylinder with a lifting plate installed inside. The three rollers are embedded together by three waste heat cylinders with different sizes and diameters, and the inner part of the cylinder is equipped with a crushing device and a guiding device.