Spray drying technology uses the atomization of gas to exchange the moisture in the material with hot air to obtain the desired substance.
Material for spray drying
Liquid materials, such as aqueous solution, emulsion, suspension, paste, etc., can be pumped into the atomizer by peristaltic pump.
Lab spray dryer system composition
Generally, the system structure of lab spray dryer can be divided into the following parts:
lHeating system: The Lab spray dryer requires less air for drying, and electric heating is mostly used to facilitate temperature regulation in the experiment.
lFeeding system: including feed pipes, feed pumps, etc., which can spray liquid materials into the drying chamber.
lAtomization system: including air compressor, atomizer, etc.
lDrying system: the drying system is the core component of the spray dryer, which is composed of drying chamber, separator, drying chamber exhaust system, collection device, etc.
lControl system: including control cabinet, PLC controller, touch screen, rotor flowmeter (flow adjustment), etc., used to control the operation of the whole spray dryer.
Working principle
Through the atomizer, the material liquid is dispersed into fine fog droplets and dispersed in the hot drying medium (hot air flow), so that the solvent evaporates quickly to obtain solid products, and the gas-solid separation is realized. Most of the products are powder or small particles.
The INNOVA ISD-Mini is a typical double-fluid spray system.
The sample solution is pumped into the double-fluid nozzle through the peristaltic pump, and the solution is atomized into fine droplets through the compressed air into the drying chamber. The surface area in contact with the hot air in the drying chamber is immediately increased by several hundred times. The sample solution is pumped into the double-fluid nozzle through a peristaltic pump, and the solution is atomized into fine mist droplets by compressed air and enters the drying chamber. The surface area in contact with the hot air in the drying chamber immediately increases hundreds of times, and dries to a solid within tens of seconds. The final solid powder is separated from the waste gas by the cyclone separator and then enters the container, and the waste gas is directly discharged to the atmosphere or an air filter device.
Features of the double-fluid spray dryer
lThe atomization particles are small and the atomization effect is complete.
Compared with centrifugal, pressure and air flow nozzles, the average particle diameter of the double-fluid nozzle after atomization is 3-4 times smaller than the former, the total evaporation surface area of the droplets is increased, and the evaporation time is shorter.
lUniform atomization
INNOVA ISD-Mini uses PID constant temperature control technology to precisely control the temperature, so that the atomized particles remain basically unchanged.
lEnergy efficient
The double-fluid atomizing nozzle can achieve fine atomization under low air pressure conditions, low energy consumption, and is suitable for laboratory environments.
