Fly ash dryer
Production capacity: customizable
Area: about 17x25-8x40㎡
Application scope: suitable for fly ash, etc.
Heat source configuration: suitable for multiple fuels
Environmental protection configuration: supporting use of multi-stage dust removal equipment

Product Introduction
       In the coal-fired boiler system of a power plant, the discharge of fly ash can be divided into two types: dry discharge and wet discharge. At present, in areas where the cement industry is developed, dry fly ash is used as a mixed material for cement production. The market is relatively good. It has been in short supply and has become a resource. The physical and chemical properties of wet fly ash are basically the same as those of dry fly ash. Due to the high water content (maximum up to 45%), it cannot meet the requirements of cement production and is not favored by the market. It can only be stacked in wet ash ash storage, which accumulates more and more, seriously polluting the environment. With the continuous optimization of national industrial policies and the increasingly stringent environmental protection regulations, the proper handling of wet fly ash has been put on the agenda. Only by improving the comprehensive utilization value of fly ash, drying wet fly ash with reasonable energy consumption and simple technology to make its moisture content less than 5%, can waste be turned into treasure and a double harvest of social and economic benefits can be realized. .

working principle
When the hot blast temperature of the hot blast stove reaches 350℃, under the instruction of the PC system, the equipment starts to work. The wet material conveying equipment sends wet fly ash with a moisture content of less than 20% into the dispersing feeder. The dispersing feeder has the dual functions of dispersing and conveying, so that the material is evenly sent to the belt conveyor. Enter the storage bin, and then pass through the screw feeder to evenly send the fly ash into the drying drum. This equipment saves energy by one third compared with the traditional tumble dryer and greatly reduces the production cost. Its working principle is as follows: the material enters the inner layer of the three-layer drum from the feeding device to achieve downstream drying. The material moves to the other end of the inner layer and enters the middle layer for countercurrent drying. The material is continuously lifted in the middle layer, and the material moves forward and backward in two steps. In this way, the material in the middle layer not only fully absorbs the heat emitted by the inner drum, but also absorbs the heat of the middle drum, and at the same time extends the drying time, where the material reaches a dry state. The material travels to the other end of the middle layer and falls into the outer layer. The material travels in the outer drum in a rectangular multi-loop manner. The material that achieves the drying effect is quickly discharged out of the drum under the action of hot air. The wet material that does not achieve the drying effect cannot be fast due to its own weight. As it progresses, the material is fully dried in this rectangular copy board, thereby achieving the drying effect and completing the drying process. The wet fly ash exchanges heat with the hot air, the main methods are convection and heat conduction, and the radiation method also has a certain effect. The three-layer roller structure is conducive to the residence time of materials along the length in the equipment, which increases the heat exchange time, improves the efficiency of heat energy use, and reduces the equipment area.


technology

  1. The cylinder body is self-insulating, and the thermal efficiency is as high as 75% (the thermal efficiency of the single-cylinder dryer is only 35%).

  2. Conducive to process layout. Reduce the building area of the plant, covering an area of about 40m2.

  3. It adopts heat-resistant and wear-resistant alloy steel plate, which is 4 times more wear-resistant than ordinary steel plate. Easy to maintain.

  4. The temperature of the outer cylinder is lower than 60℃ (the temperature of the outer cylinder of the single-cylinder dryer is as high as 150℃), the outlet temperature is low, and the discharge temperature is lower than 80℃.

  5. The outlet temperature is low, and it can be directly matched with the air box pulse bag filter.

  6. There is no need for large and small gears to rotate, and supporting wheels are used for rotation.

  7. The hot blast stove can be equipped with boiling furnace, coal injection furnace, hand-burning furnace, and also used in oil and gas furnaces. It can bake blocks, pellets and powder materials below 20 mm.