Biopharmaceutical Dryers. The most commonly used pharmaceutical dryers are spray dryers. Spray drying is well suited to the continuous production of dry solids in powder, granulate, or agglomerate particle form from liquid feedstocks, which can include solutions, emulsions, and pumpable suspensions. These dryers atomize the feedstock into a spray of droplets, which are put in contact with hot air in a drying chamber. Evaporation of moisture from the droplets and formation of dry particles proceed under controlled temperature and airflow conditions, and powder is continuously discharged from the drying chamber to be recovered from the exhaust gases using a cyclone or a bag filter. Every spray dryer has a feed pump, atomizer, air heater, air disperser, drying chamber, systems for powder recovery, and exhaust air cleaning and process control systems.