Mechanical Knowledge Base: "Coal Slurry Dryer"

Slime dryer working principle

The slime itself has high humidity and high cohesiveness. During the drying process, the wet coal slime enters the coal slurry disintegration equipment via a belt conveyor, and the rapidly-dispersed massive coal slurry enters a dryer with a negative pressure and is divided into Several working areas: First, in the material guiding zone, wet slime enters this area and rapidly evaporates a large amount of water after it comes into contact with high-temperature negative pressure hot air. The slime is crushed under the large guide angle and is not bonded. Import the next work area; Second, the cleaning area, wet slime in this area is copied by the copy board to form the state of the material curtain, the material is easy to form a sticking drum wall when the material falls, in this area due to equipment design with cleaning device, cleaning device The slime can be rapidly cleaned out of the wall of the binding cylinder. In this process, the cleaning device also acts as a crusher for the agglomeration of the mass ball, thereby increasing the heat exchange area, improving the efficiency of heat and mass transfer, and increasing the drying rate; The third is the inclined plate area, which is a low-temperature drying area. The slime has been in a state of low moisture looseness in this area. This area has no adhesion phenomenon. After heat exchange, the finished product reaches the required moisture requirement, and the movement enters. The final discharge area; Fourth, in the discharge area, dry master cylinders do not have copying plates in this zone. The material is rolling in the zone to the discharge port to complete the whole drying process.

Slime dryer application

Coal is a flammable item. Slime is also easy to burn under the premise of high temperature. Rotary slime dryer, a new type of heat exchange equipment that uses flat plates to dry materials, has the advantages of low energy consumption, stable performance, etc. It also applies to other materials for a wider range of drying and precipitation applications. While ensuring that the quality of the dried slime is constant, the primary drying zone is dried with high temperature in the downstream, and in the high-humidity state, the inlet temperature is 430°C, and the slurry is instantaneously exchanged with the mass of the coal to remove masses of heat. Partial moisture ensures that the calorific value of the slime does not change, and it is not easy to catch fire. The secondary drying zone is dried by counter-current drying at room temperature of 300 °C. It is a high-yield water removal zone and ensures coal during the rotary drying process. No coking occurs on the surface of the mud; the third drying zone is the normal drying zone, and the indoor temperature is between 120 °C and 210 °C. It is the crushing device inside the drum that repeatedly tears, impacts, spills, and dries. The four-step drying is The high-temperature hot air under negative pressure is used to remove moisture, and is a high exhaust zone with a room temperature of 60 °C -80 °C. Through the above operation, the thermal value of the slime before drying is increased compared to that before drying, and the moisture content is dried within 8%, which is a real effect of energy saving and consumption reduction.

Slime dryer features

1. Dryer has strong anti-overload capability, large amount of processing, low fuel consumption, and low drying cost;

2, using the co-current drying method, the flue gas and wet materials from the same side into the dryer, you can use high-temperature flue gas to obtain a high evaporation intensity, drying machine outlet temperature is low, high thermal efficiency;

3. The operating parameters can be changed according to the nature of different materials, so that the material can form a stable full-cut fabric curtain in the dryer cylinder body, and the heat exchange of the quality is more fully;

4. The new feeding and discharging device eliminates plugging, discontinuity, inhomogeneity, and material return of the tumble dryer and reduces the load on the dust removal system.

5. The new internal structure enhances the cleaning and heat transfer of the dispersed material, eliminates the sticking phenomenon of the inner wall of the cylinder, and has stronger adaptability to moisture and viscosity of the material;

6. The dryer achieves “zero horizontal thrust”, which greatly reduces the wear of the brace wheel and ensures smooth and reliable operation of the barrel.

7. The dryer adopts “aligning roller device” to make the contact between the roller and the roller always be in linear contact, thus greatly reducing wear and power loss;

8, according to user requirements to control the product size and moisture, drying the slime product moisture up to 8%, particle size can be controlled below 8mm.