The maintenance of the pressure spray dryer should focus on the cleaning and inspection of the atomization system, seals and key components. The specific methods are as follows:
1. Atomization system maintenance
Daily cleaning: After each operation, immediately clean the nozzle, feed pipeline, and pump body with clean water or alcohol to prevent material residue from clumping. For high viscosity materials such as gelatin, it is necessary to thoroughly clean them with an acidic solution such as citric acid.
Nozzle inspection: Regularly check the wear of the nozzle, replace deformed or worn nozzles every 3-6 months to ensure even atomization. During installation, it is necessary to calibrate the atomization pressure (usually 10-20 bar).
2. Sealing and lubrication management
Seal replacement: Regularly inspect and replace worn sealing rings to prevent liquid or air leakage. The pneumatic valve piston needs to be kept intact, and there should be no leakage in the water flushing system.
Lubrication and maintenance: The bearings of the centrifugal atomizer need to be lubricated regularly, the oil pump should supply oil normally, and the oil level should be kept within the range of the scale line. If the oil pump is abnormal, it should be stopped immediately for maintenance.
3. Key component inspection
Filter cleaning: The filter material of the air filter needs to be cleaned or replaced every six months, and the dust filter needs to be replaced when the pressure difference exceeds 10kPa.
Electrical and safety: Check the power lines, grounding lines (resistance<4 Ω), and heating system to ensure no aging or erosion. Explosion proof devices and electrostatic grounding are required when handling flammable materials.
4. Long term maintenance strategy
Shutdown maintenance: Disassemble the nozzle seal and store it, apply anti rust oil to key components. Clean glassware with a mild cleaning agent to avoid corrosion from organic solvents.
Parameter recording: Establish and maintain files to record trends in temperature, pressure, and other parameters, and predict the risk of blockage.
5. Operating standards
Material pretreatment: Before feeding, it is necessary to filter (≤ 100 mesh), adjust the concentration and viscosity (50-200cp), and add anti caking agents to salt containing materials.
Parameter control: Set the inlet air temperature (thermal sensitive materials ≤ 80 ℃) and atomization pressure according to the material characteristics to avoid overload operation.
The above measures can effectively extend the service life of the equipment and ensure stable drying effect.