Reasons for low recovery rate of spray dryer and Solutions
When users use the spray dryer, they often encounter some problems, 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 powder running phenomenon, and the noise, etc., and they need to understand the corresponding solutions. In this regard, some manufacturers' technical personnel have listed several common fault causes and solutions, which are for industry reference only.
Fault 1: There are a lot of impurities in the product
There are generally three reasons for this phenomenon. First, the material in the spray dryer contains impurities, which are not filtered out during filtration. The solution is to check the air filter and replace the filter according to the situation; second, the purity of the material liquid is not high, the solution is to Sampling and testing the material liquid to filter out impurities in the material liquid. Third, there are impurities in the equipment. The solution is to clean the equipment regularly to remove impurities.
Fault 2: Wet powder adhered to the inner wall of the main tower
There are generally two reasons for this phenomenon. First, the feed speed of the material is too fast and the amount is too large to make it completely dry. The solution is to slow down the speed and quantity of the feed and properly adjust the feed pump; second, the user does not follow the requirements in the manual During the operation, the main tower was not heated. The solution was to increase the inlet and outlet temperatures of the dryer.
Trouble three: the equipment is running loud
The technical staff said that generally speaking, the atomizing disk and bearing of the spray dryer are the main parts that produce noise, so if the user finds that the equipment is noisy, the two parts should be checked, mainly to see whether the atomizing disk is in a balanced state 3. Whether the bearing works normally and whether the lubricant is added correctly. If any damage is found, it should be repaired or replaced immediately.
Trouble four: The phenomenon of running powder is serious, and the product recovery rate is low
If there is a problem with the cyclone separator, or if the dust removal performance is low, it is prone to dusting. 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 increase the secondary dust removal appropriately.
It is worth noting that in addition to the need to grasp the causes of common failures and maintenance methods, users need to pay attention to equipment maintenance in order to ensure the service life of the equipment.
For example, if the user improperly operates the spray dryer for a long time, some parts of the machine may have aggregates that affect the normal operation of the equipment. At this time, the user should stop working and clean the aggregates in the drying tower.
After the equipment has been in operation for a long time, users need to carry out necessary inspection and maintenance of the equipment. For the feeding system, check the filters, pipes, valves, nozzles, etc., check for clogging, and clean them regularly if necessary; check the nozzle wear of the equipment for timely replacement; check whether the pump leaks oil and whether the pressure is normal , Whether the oil level is normal, etc .; for the fan, you should check whether the shaft and bearing are short of oil and heating, whether there is vibration, noise, etc., and clean the filter screens of the oil pipe, oil pump and oil nozzle if necessary.
In addition, in case of emergency, the user must immediately shut down the equipment, and shut down the blower and the material pump first. In case of sudden power failure, the user should pull out the gas engine to naturally cool the tower body, and then open the sewage valve to drain the slurry in the slurry pipeline and clean the equipment.
The 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 spray hole size of the material liquid pump can be adjusted to obtain the required spherical particles. At present, spray dryers are mainly used for drying some heat-sensitive liquids, suspensions and viscous liquids, and also for drying fuels, intermediates, soap powder and inorganic salts, etc., and are widely used in the pharmaceutical industry.