Structural Principle of Multi-layer Multi-stage Multi-effect Sludge Dryer

Each layer of multi-layer multi-stage multi-effect sludge dryer can be regarded as an improved type of sludge drying equipment, and its working principle is the same as that of hollow paddle dryer. The working principle is the same as that of the hollow paddle dryer. The number of layers can be combined with 3 to 5 layers according to the production needs. According to the material in the drying process of powder, particle physical properties of the changes in water evaporation rate changes in the comprehensive heat transfer coefficient of the changes in factors such as the structural design of all levels of blade, operating parameters to achieve the optimal design and the best choice.

Sludge dryer with the fastest speed makes the sludge in the drying process quickly rushed through the “adhesive phase area”. At the same time, the clever structure makes the sludge reach a two-way shear state in the drying process.

The dried sludge is continuously fed into the feeding port of the dryer by the screw feeder in a quantitative manner. After the sludge enters the dryer, the sludge is turned and stirred by the rotation of the paddles, and the heating interface is constantly renewed, which is in contact with the body of the dryer and the paddles, and it is sufficiently heated so that the surface moisture contained in the sludge is evaporated.

At the same time, the sludge is conveyed with the rotation of the paddle shaft into a spiral trajectory toward the discharge port, and continues to be stirred in the conveyance, so that the moisture exuded from the sludge continues to evaporate. Finally, the uniformly dried qualified product is discharged from the discharge port. The jacketed shell structure makes the sludge uniformly heated at all interfaces inside the machine, and the shaft body rotates, the sludge is constantly tossed inside the equipment, and the heated surface is constantly renovated. Thus, the steaming efficiency of the equipment is greatly improved, which not only achieves the purpose of sludge drying, but also realizes the low-cost operation of the whole set of devices.

Different materials choose different drying process, it is very important to choose the right drying process. General single-stage drum dryer does not target the characteristics of the material to dry so that the drying out of the material color is poor, sludge is a kind of material that is not easy to dry, so that the drying out of the material skin dry inside the wet and dry and wet unevenly, the use of DC scroll plus AC reciprocating fast dryer, so that the drying out of the material color and lustre is good, to save resources to improve economic efficiency.

Sludge is a solid sedimentary material produced by water and sewage treatment process. Its main characteristics are: high water content (can be as high as 99% or more), high organic content, easy to decay and odor, and fine particles, small specific gravity, gelatinous liquid.

Sludge is mainly divided by source: domestic sewage sludge, industrial wastewater sludge and water supply sludge. The disposal and treatment of various sludge has become a persistent problem that restricts urban development and urban health.

With the strengthening of national energy saving and emission reduction, the improvement of national environmental protection awareness, and the increasing production of urban sludge, sludge disposal and development and utilization of sludge has become an important issue in the national environmental protection and remediation work.

The development of sludge drying and processing technology makes sludge agricultural use, sludge fuel and sludge incineration possible. The improvement and innovation of sludge drying technology and sludge dryer directly promotes the development of sludge disposal means, expands the range of options for sludge disposal means, and makes it more and more reliable in terms of safety, reliability and sustainability.