Introduction to drying principle and common equipment of sludge dryer Henan Hongxing

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Drying principle and common equipment of sludge dryer

Introduction to common equipment of sludge dryer

 Sludge Dryer

frequently-used Sludge Dryer It is a single channel rotary dryer. It is suitable for drying of municipal sludge. Single channel rotary dryer is a new type of equipment developed from ordinary rotary dryer. The internal installation of depolymerization, movable grate type wing plate, cleaning device and crushing device can dry viscous materials which cannot be treated by ordinary rotary dryer. According to the characteristics of sludge with certain viscosity and small particle size, single channel dryer is the choice.

Using single channel rotary dryer, forward flow process and special designed feeding device, the sludge can quickly exchange heat with hot flue gas at the moment when it enters the dryer, forming a layer of hard shell on its surface, which greatly reduces the phenomenon of sludge adhering to the cylinder and material accumulation. In the 1 / 4 section of the dryer head, in addition to the installation of the lifting plate, the depolymerization and linked grate wing plate for enhanced evaporation are installed at the same time, which can not only conduct heat, but also prevent the sludge from blocking the cylinder and the lifting plate. Making full use of the characteristics of fast drying rate at the feed end, the method of "stripping" layer by layer can make it dry rapidly.

Drying principle of sludge dryer

Sludge dryer makes everything possible The material with 90% water content can be dried to the finished product at one time. In view of the characteristics of sludge agglomeration in the process of drying sludge, the structure of material plate of general single channel dryer was changed, and combined self-cleaning device was adopted, which greatly expanded the application scope of single channel dryer. It can not only dry all kinds of sludge, but also dry all kinds of high viscosity materials.

The sludge enters the guide plate in the dryer through the chute of the feeder. With the rotation of the cylinder, the sludge is led to the inclined lifting plate, that is, it is lifted to the central position of the cylinder body, and gradually spreads to form a material curtain, through which the high-temperature air flow passes to preheat the sludge and evaporate some moisture. When the sludge spills and moves to the active grate wing plate, the material is mixed with the preheated grate wing plate to transfer heat to the material and make part of the water evaporate. At the same time, the material carried by the wing plate is lifted and scattered, repeated for many times, and the material and hot air flow carry out convection and contact heat exchange. At the same time, the cleaning device buried in the material also slides along the inner side of the arc-shaped lifting plate to clean the materials adhered to the inner wall of the lifting plate. When the cleaning device turns the vertical line with the cylinder body, it drags on the back of the arc lifting plate to clean the materials adhered to the outer wall of the lifting plate. With the continuous rotation of the cylinder, part of the water evaporates and the sludge is further dried. At the same time, the cleaning device also plays a role in breaking the sludge ball, which improves the drying speed. After drying, the sludge becomes loose material with low moisture content and is discharged from the outlet.

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