Drying machines, as an indirect heating and drying equipment for sludge, have been applied in the chemical industry, food industry, and feed industry for decades. It has now developed into a fairly mature drying process and has a very high market share in the international market.
The main body of the dryer consists of a cylindrical shell and a set of central disks that run through it. The disk group is hollow, through which the heat medium flows and indirectly transfers heat to the material to be processed. The material passes between the disc and the shell, receiving heat transferred by the disc, evaporating water, and the evaporated water vapor accumulates in the dome above the disc and is carried out of the dryer by a small amount of ventilation.
The disc of the dryer has two functions: firstly, it provides sufficient heat exchange area for the sludge; secondly, it rotates slowly, and the small propeller on it pushes the sludge to flow in the designated direction and plays a good stirring role. By utilizing the double-sided heat transfer of each disc, a large heat exchange area can be provided in a small space, making the disc dryer compact in size.
The edge of the disc of the dryer has some small blades with a certain inclination angle, which not only helps to guide the flow of sludge, but also plays a role in stirring.