Overview of Disc Drying Machine Equipment
Disc dryer, also known as multi-layer disc dryer, is a multi-layer disc, rotary rake stirring, vertical continuous drying device, belonging to the contact dryer mainly used for conduction drying. This equipment has been continuously improved and developed based on fixed bed conduction dryers and rake type stirring dryers. Disc dryer, also known as multi-layer disc dryer, is a multi-layer disc, rotary rake stirring, vertical continuous drying device, belonging to the contact dryer mainly used for conduction drying. This equipment has been continuously improved and developed based on fixed bed conduction dryers and rake type stirring dryers.
Disc dryer is suitable for situations with good heating conditions and materials that allow for prolonged exposure to heating. It is quite suitable for handling freely flowing, non adhesive, extremely fine powders (below 100 mesh) and granular materials with wide particle size distribution.

Working principle of disc dryer
The structure of the disc dryer can be divided into contact conduction type, hot air convection type, and convection conduction mixed type according to the heating method. According to the operating pressure, there are three types: atmospheric pressure type, airtight type, and vacuum type. It can be used as both a dryer and a cooler, or both.
The equipment mainly consists of shell and frame, hollow heating plate, main shaft and mixing arm and rake blade, upper and lower bearings, coupling, variable speed drive device, feeder, inlet and outlet of heat carrier and its control instruments, maintenance door and discharge device, etc. When vacuum drying, vacuum, separation or condensation equipment is equipped.
The shell of the disc dryer is a vertical cylindrical or polygonal cylinder. When operating under vacuum or airtightness, considering the force situation of the equipment, it is usually cylindrical. Internally equipped with a frame to securely install multi-layer horizontal annular hollow heating plates. The distance between the upper and lower plates is fixed, and the hollow part of the hollow heating plate can be heated by heat carriers such as steam, hot water, or thermal oil. A partition or support rod is installed in the middle of the heating jacket to increase rigidity and strength. There are inlet and outlet pipes on each heating plate, which can be assembled in series, parallel or series parallel. The temperature of each heating plate can be controlled separately and the temperature distribution inside the equipment can be adjusted.
If required by the process, a coolant can be introduced into the bottom heating plate to reduce product temperature, recover heat, and avoid the phenomenon of material temperature tending to the wall temperature of the heating plate and overheating and deterioration in the later stage of the fixed bed.

Performance characteristics of disc dryer
1. Compared with box dryers, disc dryers have material mechanical conveying, continuous production, and adjustable processing capacity. Avoiding heavy loading and unloading of materials and manual flipping work, with light labor intensity, good working conditions, and convenient management;
2. High drying efficiency, with a total heat transfer coefficient of 240-544 kJ/(m2 · h ·℃) and an average evaporation intensity of about 3-10 kg/(m2 · h);
3. Vertical installation, complete insulation, high utilization rate of heat source and waste heat. Evaporation requires only 1.1-1.4 kg of steam per kilogram of water. In addition, the required power is only about 1/10 of that of the rotary cylinder dryer, which is economically feasible;
4. Small footprint, compact structure, simple equipment installation, and on-site use both indoors and outdoors;
5. The discharge speed of exhaust gas or steam is low, and there is less dust flying, which can meet the requirements of the three waste emission standards and improve the working environment. It is particularly suitable for drying pesticide raw materials without the need for dust removal equipment;
6. The number of heating plates and spindle speed can be adjusted, and the residence time of materials in the dryer can be freely selected according to process requirements;
7. The temperature of each layer of material tray can be controlled to achieve the specified temperature distribution. Drying, cooling, and using can obtain dry products with uniform quality and low mechanical stress;
8. Standardization and generalization of equipment components, assembly according to working conditions, with strong adaptability;
9. If combined appropriately with other devices, solvents and dry paste materials can also be recovered. It can also be used for various product thermal processing processes such as roasting and sublimation.

Process flow of disc dryer

Application scope of disc dryer
1. Organic chemical products: polyvinyl chloride resin, polytetrafluoroethylene resin, fumaric acid, anthraquinone, nitroanthraquinone, para aminophenol, melamine, cyanuric acid, para aminobenzenesulfonic acid, antioxidant 168, phenol As, stearate, aniline, nitroaniline, dipentaerythritol, chlorinated paraffin, calcium formate, triethylenediamine EDTA、 Rubber accelerators, sodium benzenesulfonate, isophthalic acid, sodium dimethyl pentasulfonate, thiourea, oil soluble aniline black dye, acid black dye, indigo and other organic chemical raw materials and intermediates.
2. Inorganic chemical products: light calcium carbonate, active calcium carbonate, nano-sized ultrafine calcium carbonate, magnesium carbonate, sulfur concentrate, pyrite, copper nickel ore, aluminum hydroxide, white gray black, strontium carbonate, barium carbonate, potassium carbonate, lithopone, insurance powder, silicon micro powder, barium sulfate, potassium sulfate, microsphere catalyst, magnesium hydroxide, copper sulfate, nickel sulfate, nickelamine, sodium molybdate, sodium chloride, cryolite, iron oxide red, nickel oxalate, cobalt oxalate, iron oxide black, lithium hydroxide, nickel hydroxide, zirconium hydroxide, calcium phosphate, sulfur, etc.
3. Medicine and food: ampicillin toxin, Deng salt, L-phenylglycine and intermediates, cefotaxime, ceftriaxone, metamizole, cimetidine, vitamin B12, vitamin C, medicinal salts, medicinal aluminum hydroxide, medicinal magnesium silicate, caffeine, tea, flower extract, silver apricot leaves, chocolate powder, starch, corn germ and other raw materials and pharmaceutical intermediates.
4. Feed and fertilizers: potassium carbonate, bio potassium fertilizer, protein feed, feed grade streptomycin, mycelium, bran, distiller's grains, grains, seeds, herbicides, cellulose, feed grade calcium hydrogen phosphate, etc.

Technical parameter table of disc dryer