Description of equipment principle of bench type micro spray dryer in the laboratory: the feed liquid treated in the previous process is sent to the atomizer above the drying room by the peristaltic pump, and the feed liquid is uniformly atomized into a group of very micron droplets, which enter the drying room. The gas enters the heating system and is heated to the temperature required by the process. It enters the drying room evenly through the hot air pipe, and is solidified at high temperature after contacting with the droplet group, and then pyrolyzed into products, The dried finished product is sent to the cyclone separator with the tail gas through the air outlet pipe for gas-solid separation, and the finished product is recovered.