Installation And Usage Precautions For Small Scale Spray Dryers

I. Working Principle of the Small-Scale Spray Dryer:

Air is filtered and heated before entering the air distributor located at the top of the dryer. The hot air flows uniformly into the drying chamber in a spiral pattern. The liquid feed is atomized into extremely fine droplets by a high-speed centrifugal atomizer situated at the top of the drying tower. These droplets flow concurrently with the hot air and are dried into a finished product within a very short period. The finished product is continuously discharged from the bottom of the drying tower and the cyclone separator, while the exhaust gas is vented via an induced draft fan.

II. Installation Instructions for the Small-Scale Spray Dryer:

1. Installation of the Drying Chamber: Support the drying chamber with both hands, then insert it at an angle into the chamber's mounting clamp. Finally, tighten the locking nut to secure the drying chamber in place.

2. Installation of the Cyclone Separator: Slide the locking nut, sealing ring, and stainless steel gasket onto the air outlet pipe of the cyclone separator. Then, insert this assembly into the equipment's main air outlet pipe. Adjust the position of the drying chamber's air outlet relative to the cyclone separator's air inlet to ensure they are perfectly aligned. Connect the two ports using a clamp, and finally, tighten the locking nut on the cyclone separator.

3. Connect the product collection pipe to the drying chamber using a clamp.

4. Connect the product collection bottle to the cyclone separator using a clamp.

5. Install the food-grade silicone tubing onto the peristaltic pump and insert the free end into the feed inlet of the spray chamber.

6. Mount the spray chamber onto the main unit of the equipment, and connect the 4mm air tube (used for the nozzle cleaning needle) and the 6mm air tube. III. Important Precautions for Operating the Small-Scale Spray Dryer:

1. During closed-loop operation of the small-scale spray dryer—specifically when spraying organic solvents—the oxygen concentration must be maintained below 5%; otherwise, there is a risk of combustion or explosion involving the organic solvents.

2. Do not touch any rotating components while the small-scale spray dryer is in operation.

3. During operation, as well as for a period of time after shutdown, the surface temperature of the small-scale spray dryer remains relatively high. Please refrain from touching components such as the bag filter, cyclone separator, air ducts, atomizer, exhaust fan, and observation windows with your hands.

4. Do not enter the drying tower until its internal temperature has cooled down to ambient temperature.

5. Exercise caution to avoid pinching your hands or fingers when opening or closing the inspection doors, or when disassembling and reassembling components such as the air ducts, cyclone separator, and atomizer.

6. It is strictly prohibited to open the inspection doors of the small-scale spray dryer if the internal oxygen concentration has not yet reached 21%; doing so poses a severe risk of oxygen deprivation to the operator, potentially leading to asphyxiation.