After the centrifugal spray dryer is in normal operation, it should also check the operation of each system regularly and record the process parameters. At the end, the heating device should be shut down first, and the liquid should be replaced by water to rinse the residual material of the tube, and then the pump is turned off. When the inlet temperature is reduced below 100 °C, the operation of the blower and the blower can be stopped. Then clean the remaining materials in the drying tower and the precipitator, turn off the dust collector and the air hammer, and finally turn off the main power supply to complete the production operation. In case of emergency, the equipment must be shut down immediately. The blower and feed pump should be shut down first. If there is a sudden power outage, the tower body should be naturally cooled, then the drain valve should be opened, the slurry in the slurry pipeline should be drained, and the equipment should be cleaned.
In addition, after use, the spray disc should be removed, immersed in water, and the residual material washed with water. Brush it with a brush when it is not washed with water. Because the residual material on the spray plate will bring about the unbalance of the spray, which will seriously affect the service life of the spray head and even damage other parts. Do not lay down after the nozzle is finished and during transportation. Improper placement will cause the spindle to bend and affect the use, so it should be placed in a fixed frame.
Centrifugal spray dryer cleaning method
In order to ensure the cleaning of the drying tower body and its pipes and all the parts in contact with the finished product, it is necessary to obtain first-class products and regular cleaning equipment. When the product variety is changed, or if the equipment has been discontinued for more than 24 hours without being cleaned, a thorough and thorough cleaning should be carried out.
The cleaning method can be selected according to the actual choice of dry cleaning, wet washing or chemical washing.
Dry cleaning: Clean with a brush or vacuum cleaner (for small dryers).
Wet wash: Wash with hot water at 60~80 °C.
Chemical washing: Wash with lye, acid and various detergents. Among them, pickling: HNO3 is formulated into a 1~2% concentration solution, the heating temperature is not more than 65 °C for washing, and then washed with water; alkali washing: NaOH is formulated into a 0.5~1% concentration solution, the heating temperature does not exceed 65 Wash at °C and then rinse with water.
After wet and chemical washing, the equipment and components should be installed and autoclaved for 15~30min.
When cleaning equipment, be careful not to wash with chlorine and its compounds.
The cleaning of the air filter should be based on the surrounding environmental conditions, that is, the amount of dust in the air. It should be cleaned once every 3 to 6 weeks, and cleaned once every 6 to 8 weeks with low dust content. The stainless steel filaments, after washing with the alkali washing method, should be evenly laid into the frame of the air filter and sprayed with light spindle oil or vacuum pump oil.