Atmospheric low temperature spray drying device and drying method

The invention discloses a normal-pressure low-temperature spray drying device and a drying method, which are composed of an air filter, a gas cooling and dehumidification device, a blower, a gas heater, a drying tower, and a cyclone separator in series, wherein the top of the drying tower An atomizing device and an air inlet are provided, and a material outlet is provided at the bottom, and the atomizing device is connected with a feed pump. The active substance extract to be dried is pumped into the drying tower, and after being atomized by the atomizing device, it exchanges mass and heat with the incoming dry air that has been added to the working temperature in the drying tower to evaporate the water into a dry powder, and then The gas enters the cyclone separator and is collected for packaging. The invention realizes low-temperature spray drying under normal pressure, and the dew point can reach -10-5°C after gas cooling and dehumidification, and the low-temperature continuous process satisfies the drying conditions of biological active substances.