High speed centrifugal spray dryerIt is an advanced drying equipment widely used in industries such as chemical, food, and pharmaceutical. Its core principle is to atomize liquid materials into small droplets through a high-speed rotating centrifugal atomizer, and then quickly exchange heat with hot air to achieve efficient drying.
The equipment mainly consists of a feeding system, atomization system, hot air system, drying tower, feeding system, and control system. During operation, liquid materials are pumped to the atomizer and, under the action of a centrifugal disk rotating at high speed (up to 10000-30000 revolutions per minute), are thrown out and form a uniform group of droplets. These droplets come into full contact with hot air and complete water evaporation in a very short period of time (usually 5-30 seconds), ultimately forming powder or granular products that are discharged from the bottom of the tower. The exhaust gas is treated by a dust removal device before being discharged.
High speed centrifugal spray dryerMaintenance is the key to ensuring the long-term stable operation of equipment, extending its service life, and ensuring product quality. Maintenance should cover core components, auxiliary systems, and daily maintenance. The specific methods are as follows:
1、 Daily maintenance (after each shutdown)
Cleaning the interior of the equipment
Thoroughly clean the residual materials on the inner wall, conical bottom, air outlet, and other parts of the drying tower to avoid material accumulation and drying (especially for materials that are easily solidified at high temperatures, such as sugars and resins). Use a soft bristled brush, compressed air, or specialized cleaning agent to rinse (corrosive materials require a medium detergent).
Clean the filter bags/materials of cyclone separators, bag filters (or water film dust collectors), remove attached dust, and replace the filter bags if necessary (filter bag damage can cause dust leakage, affecting the environment and product recovery rate).
Clean the feed pipeline, feed pump, and atomizer feed inlet to prevent material residue from blocking the pipeline or corroding the equipment (such as rinsing with clean water until neutral after handling salt and acidic materials).
Check the status of vulnerable parts
Check the atomizing disc of the atomizer: observe whether there is wear, deformation, or cracking, whether the edges are smooth (if there are gaps, it will cause uneven atomization), and if necessary, perform balance verification (unbalanced atomizing disc can cause severe vibration and damage bearings).
Check the seals, such as the sealing ring of the drying tower door, gaskets for pipeline connections, atomizer shaft seals, etc. If aging, damage, or leakage is found, replace them immediately (poor sealing can cause hot air leakage, affect drying efficiency, and may also inhale external impurities).
Check the fan impeller: Clean the dust accumulation on the impeller (dust adhesion can cause impeller imbalance, increase fan load and noise), and check whether the impeller is corroded or deformed.
Electrical system inspection
Wipe the control panel to ensure that the buttons and instrument surfaces are clean, check whether the indicator lights, temperature controllers, pressure gauges, etc. are displaying normally, and whether the wiring terminals are loose or oxidized (use fine sandpaper to polish the oxidized parts).
Check the temperature rise of the motors (induced draft fan, supply fan, atomizer motor) (touch the casing after stopping the machine, and if it overheats, check whether it is due to bearing oil shortage or excessive load).
2、 Regular maintenance (weekly to monthly, adjusted according to usage frequency)
Lubrication system maintenance
Centrifugal atomizer bearings: Add lubricating oil (or grease) according to the equipment manual, usually using high-temperature wear-resistant lubricating oil (such as 32 or 46 mechanical oil), with moderate oil volume (too much can cause overheating, too little can lead to insufficient lubrication), replace the lubricating oil once a month (shorten the cycle during continuous operation), and clean the oil chamber impurities.
Rotating components such as fans and feed pumps: Check the lubrication condition of bearings, supplement or replace lubricating grease (such as calcium based grease, lithium based grease), and ensure flexible rotation without jamming.
Calibration and fastening of mechanical components
Tighten the connecting bolts of the equipment, including the atomizer base, fan flange, pipeline bracket, etc. Long term vibration may cause the bolts to loosen, leading to abnormal equipment noise or leakage.
Calibrate instruments and sensors, such as inlet/outlet thermometers, pressure gauges, level gauges, etc., to ensure measurement accuracy (if the deviation is too large, professional personnel should be contacted for calibration).
Check the atomizer speed: Measure the actual speed with a tachometer and compare it with the set value. If the deviation exceeds 5%, check the tightness of the motor belt (belt drive type) or the variable frequency system (variable frequency drive type).
Pipeline and valve maintenance
Check whether the hot air duct and exhaust duct are corroded or deformed, and whether the insulation layer is intact (damage can cause heat loss and increase energy consumption).
Clear the filter on the feed pipeline (if any), remove impurities, and prevent blockages from affecting the feed volume.
Operate each valve (air door, feed valve, etc.) to ensure flexible opening and closing. If there is any jamming, lubricant should be added or the valve core should be replaced.
3、 Long term shutdown maintenance (over 1 month)
Comprehensive cleaning and protection
Thoroughly clean the inside and outside of the equipment, especially the parts in contact with materials (such as drying towers, atomization disks, feeding systems), and disinfect them if necessary (in the food and pharmaceutical industries).
Dry the interior of the drying tower and pipelines with compressed air to prevent residual moisture from causing rust.
Metal components such as atomizing discs and fan impellers can be coated with rust proof oil and covered with plastic sheeting to prevent dust.
Component storage and power-off
Disassemble vulnerable parts (such as filter bags, sealing rings, and atomizing discs) and store them separately in a dry and ventilated environment, avoiding direct sunlight or compression.
Disconnect the main power supply of the equipment, turn off the water and heat source valves, and post a "shutdown maintenance in progress" sign on the control panel to prevent accidental operation.
regular inspection
Check the storage environment of the equipment weekly, keep it dry and free of corrosive gases, and manually rotate the rotating parts (such as atomizer bearings) 1-2 times a month to prevent bearing corrosion and jamming.