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Model C30 -Flash Dryer - Dispersion Dryers
Drying bulk materials with very high product moisture poses a significant challenge. The Allgaier Flash Dryer (based on the fluidized bed dryer design) tackles this task in just one drying step without product recirculation. With the spray dryer, it is possible to process fine and highly moist powders or filter cakes that disintegrate during drying and can be pneumatically conveyed out of the dryer.
- High performance
- Gentle product treatment
- Wide range of applications
The Allgaier industrial Flash Dryer consists of a vertical cylindrical housing divided by a perforated air distribution plate. The drying gas enters through a nozzle below the air distribution plate and flows upward in a spiral motion. The moist product is fed onto a rapidly rotating centrifugal wheel (optional) through a feed pipe and dispersed by the airflow. By using various centrifugal tools, lumpy wet materials are efficiently disintegrated. The intensive circulation of product and hot gas stream allows for optimal heat and mass transfer, ensuring a significantly more efficient drying process compared to conventional stream dryers. The dried end product is separated and discharged from the gas stream using a cyclone and/or a fine dust filter.
Stream dryers are suitable for processing all materials that can be pneumatically conveyed in a dry state. Spray drying is used in the following areas:
- Food industry: Food products such as dextrose, starch derivatives, and spices.
- Chemical industry: Sensitive substances like dyes, pigments, fiberglass, and plastics.
- Paper industry: For example, cellulose or shredded paper/cardboard products.
- Mineral industry: Salts, peat, limestone powder, and gypsum.
- Pharmaceutical industry: Active ingredients, additives, fillers, and excipients.
- Recycling: Various filter cakes or film scraps.
Flash dryers can be heated through direct heating methods such as gas burners/electric heating elements or indirect systems like steam/thermal oil heat exchangers.
Combined Drying and Cooling in Spray DryersThe combination of drying and cooling within a fluidized bed dryer is not feasible. If product cooling to low temperatures is required according to the process, the use of a downstream cooling unit (depending on the nature of the drying material) can be considered.
Possibilities for Energy Recovery and Efficiency EnhancementAfter the drying material has been separated using the exhaust-side cyclone and/or exhaust filter, the warm but cleaned exhaust air stream can be passed through a heat exchanger. This allows for the thermal energy of the exhaust air stream to be used for preheating the drying gas. Depending on the individual process parameters, high-temperature heat pumps can also be integrated into this energy recovery concept to heat the hot gas stream. For more information, please refer to this link.
- Strong Performance: Direct drying of very moist and lumpy products without pre-treatment.
- Gentle Product Treatment: Very gentle drying process due to co-current regime.
- Versatile Applications: Can be used as an economical pre-dryer in multi-stage drying systems.
- Compact Design: Optimal investment costs due to compact and space-saving construction.
- Maximum Flexibility: Ability to use all common heating media such as natural gas, saturated steam, hot water, electric heat, or thermal oil.
- Minimal Process Costs: Low operating costs due to high water evaporation capacity and heat recovery from the dryer exhaust.
Despite the versatile applications of spray dryers/fluidized bed dryers, there are also limitations to this dryer model. Specifically, for products that cannot be dried to the desired residual moisture within the short drying time or for materials with lumps/coarse particles that cannot be dispersed by the disintegration tool. Due to the wide range of machine offerings at Allgaier, these challenging areas of Flash Dryers can be addressed by utilizing other methods such as fluid bed dryers, drum dryers, or rolling bed dryers, which may provide an ideal solution.