A spray dryer is a device that can complete drying and granulation at the same time. According to the process requirements, the pressure, flow rate and nozzle hole size of the liquid pump can be adjusted to obtain the desired spherical particles. At present, spray dryers are mainly used for drying some heat-sensitive liquids, suspensions and mucus, and also for drying fuels, intermediates, soap powder and inorganic salts, and are 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 to the inner wall of the main tower, the large impurities in the product, the serious phenomenon of powder running, and the noise, etc., and need to know the corresponding solutions.
Fault 1: Wet powder is attached to the inner wall of the main tower.
There are usually two reasons for this phenomenon. First, the material feeding speed is too fast, the amount is too large, and it cannot be completely dried. The solution is to slow down the feeding speed and quantity, and adjust the feeding pump appropriately; the second is that the user did not operate according to the instructions, and the main tower was not heated. The solution is to increase the inlet and outlet temperatures of the dryer.
Fault 2: There are a lot of impurities in the product.
There are generally three reasons for this phenomenon. First, there are impurities in the spray dryer material, which are not filtered out during filtration. The solution is to check the air filter and replace the filter screen according to the situation; the second is that the purity of the material liquid is not high. The solution is to sample and test the material liquid to filter out the impurities in the material liquid; third, the equipment contains impurities. The solution is to regularly clean the equipment thoroughly to remove impurities.
Fault 3: The phenomenon of powder running is serious, and the product recovery rate is low.
If there is a problem with the cyclone separator, or the dust removal performance is low, the phenomenon of powder running is easy to occur. In response to this phenomenon, the former solution is to check the cyclone separator to see if there is a gap and whether the air tightness is intact; the latter solution is to appropriately increase secondary dust removal.
It is worth noting that users not only need to master the causes and maintenance methods of common faults, but also pay attention to equipment maintenance to ensure the service life of the equipment.
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