1、 Structure and working principle of coal slurry dryer
The coal slurry dryer is mainly composed of a heat source, a dispersing device, a belt feeder, a feeding machine, a rotary drum, a belt discharge machine, an induced draft fan, an unloader, and a distribution cabinet. The working principle of this equipment is as follows: coal slurry has a certain viscosity. During the drying process, wet coal slurry enters the dryer and is divided into the following working areas: first, the guide area. Wet coal slurry enters this area and quickly evaporates water when it comes into contact with high-temperature hot air. Under the action of the large guide angle plate, the material cannot form a bond and is then introduced into the next working area; The second is the cleaning area, where wet coal slurry is picked up by the plate and forms a material curtain state. When the material falls, it is easy to form a bonding roller wall phenomenon. In this area, due to the equipment design with a cleaning device, the cleaning device effectively cleans the material adhered to the inner wall. During this process, the cleaning device also breaks the material clumps, thereby increasing the heat exchange area and improving the drying rate; The third is the inclined lifting plate area, where the wet coal slurry is already in a low moisture and loose state, and the material no longer has any bonding phenomenon. After heat exchange, the material reaches the required moisture state and enters the discharge area; The fourth is the discharge area, where the drum does not have a feeding plate and the material rolls and slides to the discharge port, completing the entire drying process.
2、 Main features
1. The dryer has strong overload resistance, large processing capacity, low fuel consumption, and low drying cost;
2. Adopting a downstream drying method, the flue gas and wet materials enter the dryer from the same side, which can utilize high-temperature flue gas to achieve high evaporation intensity. The dryer has low temperature and high thermal efficiency;
3. The operating parameters can be changed according to the properties of different materials, so that the materials can form a stable fully broken fabric curtain in the dryer cylinder, and the mass and heat exchange is more sufficient;
4. The new feeding and discharging devices, as well as the drum dryer, have reduced the load on the dust removal system due to issues such as blockage, discontinuity, unevenness, and material return during feeding;
5. The new internal structure enhances the cleaning and heat conduction of dispersed materials, eliminates the sticking phenomenon on the inner wall of the cylinder, and has stronger adaptability to material moisture and viscosity;
6. The dryer has achieved "zero horizontal thrust", greatly reducing the wear of the retaining wheel and ensuring smooth and reliable operation of the cylinder;
7. The dryer adopts a "self-aligning supporting wheel device", which ensures that the matching between the supporting wheel and the rolling ring is always in linear contact, greatly reducing wear and power loss;
8. The product particle size and moisture can be controlled according to user requirements. When drying coal slurry, the product moisture can reach below 8%, and the particle size can be controlled below 8mm.
3、 Process flowchart
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