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.
Bry-Air has specially developed high performance dehumidifiers for supplying precisely controlled, stable and consistent dehumidified air to the inlet of spray dryers. Providing stable and consistent inlet air enables higher performance and output from spray dryers and improves the quality of powder. It reduces dependence on operator for a constant adjustment of parameters on account of varying outside environment. It also reduces energy bills of heater for heating the inlet air up to the required temperature. Dehumidifying the inlet air also increases its temperature, as a result of which the heater has to do less work to heat the air to the required temperature.
Dehumidification of the air helps slurry to dry fast, and allows smooth and free flow operations. Bry-Air has developed a range of special high performance dehumidifiers which enable this to happen. Bry-Air dehumidifiers control precisely the moisture content of the incoming air. It results in following advantages.