What are the types of sludge dryers?

Sludge dryer is a kind of indirect heating and low speed stirring dryer. There are two or four hollow rotating shafts inside the equipment, and the hollow shafts are densely arranged in parallel with the fan wedge-shaped hollow blades, with special and ingenious structural design.

The relative rotation of the shaft body of the sludge dryer utilizes the principle and structure of the same angular velocity and different linear velocities to cleverly achieve the self-cleaning effect of the sludge on the shaft body, preventing the phenomenon of “holding the shaft” in the process of sludge drying to a larger extent. The fastest speed makes the sludge in the drying process quickly rushed through the “adhesive phase area”.

Classification of sludge dryer:

I. Wedge-type hollow paddle dryer

Scope of application: Higher one-time investment in equipment, low investment in civil construction, and only one-third of the operating cost of hot air direct-type dryer. Suitable for single machine sludge treatment capacity of 3 tons / hour or less, a variety of final moisture content requirements of the project.

Second, rotary cylinder dryer with internal crushing device

Scope of application: rotary cylinder dryer with internal crushing device has moderate one-time investment in equipment, higher investment in civil engineering and higher energy consumption, suitable for sludge drying projects with a single processing capacity of less than 5 tons/hour and lower final moisture content requirements (less than 20%). Import pump Valve Industrial washing machine

Third, with internal fluidized bed dryer

Scope of application: the equipment is a one-time investment is moderate, the investment cost of civil construction is high, energy consumption is large. Suitable for stand-alone sludge processing capacity of 8 tons / hour, the final moisture content of the project is low.

Performance characteristics of sludge paddle dryer:

(1) Compact equipment, the dryer covers a small area.

(2) High heat utilization rate.

(3) The blades have certain cleaning ability, which can improve the heat transfer effect of the blades.

(4) It can realize continuous and fully closed operation, reducing man-made and dust emission.

(5) The tail gas treatment system generally adopts two forms of atmospheric pressure or negative pressure to reduce the exhaust volume as much as possible according to different situations, so as to reduce the cost of tail gas treatment, and for the odor after sludge evaporation, it can be used after the deodorization system is processed to meet the standard of discharge.

(6) It can be used for the drying of toxic, solvent-containing high-risk chemical sludge, and can be used for low-temperature drying. This not only can directly recover the solvent, but also can greatly reduce the emission of exhaust gas, greatly improving the safety and environmental performance.