Spray Dryer Powder Phenomenon Serious What Is The Reason And The Solution

Spray Dryer Powder Phenomenon Serious What Is The Reason And The Solution

Date:Jul 27, 2020

Spray dryer is a device that can complete drying and granulation at the same time. According to the technological requirements, it can adjust the pressure, flow rate and the size of spray hole of material liquid pump to obtain the required spherical particles.At present, spray dryer is mainly used for drying some heat-sensitive liquid, suspension and viscous liquid, but also for drying fuel, intermediate, soap powder and inorganic salt, etc., widely used in the pharmaceutical industry.

In the process of using the spray dryer, users often encounter some faults, such as the adhesion of wet powder on the inner wall of the main tower, the presence of a large number of impurities in the product, the serious phenomenon of powder running, loud noise and other problems, which require the corresponding solutions.In this regard, a manufacturer's technical personnel listed several common failure reasons and solutions, only for the industry reference.

Failure 1: the main tower wall adhesion wet powder

There are generally two reasons for this.First, the material feeding speed is too fast, the amount is too large, so that can not be completely dry, the solution is to slow down the feeding speed and quantity, the feed pump for the appropriate adjustment;Second, the user did not operate according to the requirements on the manual, the main tower did not heat, the solution is to raise the temperature of the dryer inlet and outlet.

Fault two: there are a lot of impurities in the product

There are generally three reasons for this phenomenon.First, there are impurities in the material of spray dryer, which are not filtered out during filtration. The solution is to check the air filter and replace the filter screen according to the situation.Secondly, the purity of material liquid is not high, the solution is to sample the material liquid detection, the impurities in the material liquid filter out;Third, there are impurities in the device memory. The solution is to clean the device regularly to remove impurities.

Fault three: running powder phenomenon is serious, the product recovery rate is low

If the cyclone separator problems, or dust removal performance is low, it is easy to run powder phenomenon.In view of this phenomenon, the former solution is to check the cyclone separator, to see whether there is a gap, and the air tightness is intact;The latter solution is a modest addition of secondary dust removal.

Fault four: the equipment runs noisily

Technical staff said, in general, spray drier atomization and bearing noise is the main part, so the user if found equipment noise big, deal with these two parts for inspection, basically be to see whether atomization plate in the equilibrium state, bearing work is normal and lubricating oil to add is correct, if found to have damaged, shall promptly repair or replacement.

It is worth noting that users need to master the causes of common faults and maintenance methods, in order to ensure the service life of equipment, also need to pay attention to the maintenance of equipment.

For example, if the user runs the spray dryer improperly for a long time, aggregates may appear in part of the machine body and affect the normal operation of the equipment. At this time, the user should stop working, carry out cleaning and clean the aggregates in the drying tower.

After the equipment has been running for a long time, the user should also check and maintain the equipment.For the feeding system, check the filter, pipe, valve, nozzle, etc., check whether there is blockage, if there should be regular cleaning;Check the wear of equipment nozzle for timely replacement;Check whether the material pump leaks, whether the pressure is normal, whether the oil level is normal, etc.;For the fan, should check whether the shaft and bearing lack of oil heating, vibration, noise, etc., when necessary, clean the oil pipe, oil pump, nozzle three filters.

In addition, in case of emergency, the user must immediately shut down the equipment, and first shut down the blower and feed pump.In case of sudden power failure, the user should pull out the gas engine, make the tower body cool down naturally, then open the drain valve, drain the slurry in the slurry pipe, and clean the equipment.


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