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Humidity Control for Pneumatic Powder Conveying Humidity / Moisture Control is a critical element for various forms of powders such as fine salt, detergents, flour, powdery foods, calcium phosphate, baking powder, wheat starch, plastics resin etc. Pneumatic conveying as a means of powder conveying system is widely used in many powder processing operations such as in handling transfer of food powders, flour in a mill, bakery or confectionery. Due to the stickiness nature of the hygroscopic powders, they get stuck into nozzles, conveying belts and mixing machines leading to increased maintenance time and bad hygiene. Stickiness – Powder gains properties of adhering or sticking to a surface and get stuck into conveying belts causing bad hygiene which ultimately leads to deteriorating of product quality. Cluster formation – Due to excess moisture similar particles of powder gather closely together forming buildups inside the mixing machine and causing blockages in free flow of powder. Lump formation – A large piece of powder sticks together without a definite shape causing obstruction in the nozzle passage and increasing the maintenance time. Caking – Moist environment forces powder to change into a solid mass which leads to increase in product wastage and slowing down of production process. Food powder processing In order to retain quality of powdery foods, they need to be dried at low temperatures. Applications Temperature (°C) Humidity (% RH) Instant Coffee Processing 26 25 Flour 24 10 Starch 24 20 Gelatin 24 10-30 Milk Powder Storage 21-36 15-30 Confectionary-Chocolate Covering 21-32 45 Coffee Packaging 18 40 Dry Spice Conveying <48 12-16 Gr/Lb Hygro Tech Engineers having a complete solution to treat the moisture problems with Hygro Dehumidifiers & drying chambers for all powder conveying, packing, storage
Desiccant Dehumidifiers used in Spray Drying product area are manufactured by Hygro to maintain desired humidity and temp levels inside the manufacturing area. for more details please visit Click Here / Contact Our Engineer @ 9886144100 for more details. Increase Throughput From Spray Dryers Up To 30% Without Adding Capacity Spray Dryers require large quantities of hot air for drying. The quality of the final product is affected by the quality of inlet air entering the dryer. The Spray Dryer mixes heated air with an atomized (sprayed) liquid stream within a vessel (drying chamber) which leads to evaporation and produces free-flowing dry powder with a controlled average particle size. Thus, the inlet air has to be dry, free of contamination, foreign particles and odourless. However, since the ambient changes throughout 24 hours, 365 days a year, the humidity present in the air, entering the Spray Dryer is not constant. Thus, the drying temperature and time inside the dryer needs close monitoring to restrict loss due to varying level of humidity present in the inlet air. These varying inlet conditions need to be monitored by an experienced operator to adjust the parameters for stable outlet conditions.