Working principle of three stage multi circuit sludge dryer

The three-stage multi loop sludge dryer is specially designed for sludge with high moisture content, high viscosity, high water holding capacity and low calorific value. The equipment adopts the working principle of direct heating and scientific and reasonable internal structure. It can be widely used in drying of municipal sludge, electroplating sludge, chemical sludge, leather sludge, papermaking sludge, petrochemical sludge, printing and dyeing sludge, etc. To get a detailed introduction to the working principle of this sludge drying machine, please continue to look down. Recommended reading: how to improve the performance of three-stage multi loop sludge dryer?

The whole working process of three-stage multi loop sludge dryer can be divided into three drying stages. In the first stage of drying, the heat exchange was carried out in a forward flow mode. After the sludge enters the drying machine barrel, it is quickly scattered by the "rotary rake crushing" device, and exchanges with high temperature hot air flow instantly, forming a layer of hard shell on its surface, which greatly reduces the phenomenon of sludge adhering to the cylinder wall, and also eliminates the possibility of accumulation and blocking. Through the built-in combined lifting plate in the cylinder, the sludge is continuously scattered to form a uniform material curtain, which greatly increases the contact area between hot air and sludge, and evaporates a large amount of water.

The rotary harrow three-cylinder multiple-loop sludge drying machine can be used for drying materials with high humidity and high viscosity. After the wet sludge enters the drum, it is broken and broken into particles by the "rotary rake" device, and it keeps rolling, rotating and separating. In this process, the surface of the sludge forms a "dry shell", and before entering the next stage, the material has become bulk. The whole drying process is divided into three stages: forward flow, counter current and reciprocating drying. Steam is discharged from the end of each stage to prevent water vapor from traveling with materials. It can adapt to the drying of sludge with different characteristics and moisture content, such as urban sludge, textile sludge, petrochemical sludge, leather making sludge, metal sludge, industrial solid waste sludge, electroplating sludge, etc. it can meet the final moisture requirements after drying. It has the characteristics of large output, fast drying, low energy consumption and stable performance.

In the second stage drying stage of the three-stage multi loop sludge dryer, the "counter current plus vortex" drying is adopted. The hot air and materials go in reverse direction, which increases the drying efficiency and strengthens the heat and mass transfer, which makes the internal moisture of the sludge seep out. Under the action of the pusher, the material enters the three-stage drying stage of "AC + reciprocating". Under the influence of the special material plate and air volume, the wet sludge is reciprocating or slow moving, and the dry sludge is fast and first. After the material meets the drying requirements, it is automatically discharged from the outlet.