In the production process of the spray drying tower, the nozzle rotation speed is too low, the evaporation amount is too low, and the centrifugal nozzle operates with noise or vibration. How should it be dealt with?
The nozzle speed is too low, and the evaporation is too low, mainly because the centrifugal nozzle parts are out of order, so stop using the nozzles and check the internal parts of the nozzles. The reason may be: the air volume of the whole system is reduced; the inlet temperature of the hot air is low; the equipment has air leakage, and cold air enters the drying room. The remedial measures are: check whether the speed of the centrifuge is normal; check whether the position of the centrifuge control valve of the spray drying equipment is correct; check whether the air filter and the air heater pipe are blocked; check whether the grid voltage is normal; check whether the electric heater works normally; Check that the components of the spray drying equipment are sealed.
There are noises or vibrations when the centrifugal nozzle is running, mainly due to the residual material in the spray disc caused by the improper cleaning and maintenance of the nozzle of the spray drying equipment, or the main shaft is bent and deformed, or the centrifugal disc is not well balanced. Solution: Check if there is any residual material in the spray tray. If it should be cleaned in time; if the spindle is abnormal, replace it and re-adjust or replace the balance of the centrifugal disc.
In order to meet market needs, improve product solubility, brewing properties and packaging properties. Some spray drying equipment increases the granulation equipment, but it increases the thermal denaturation and loss of aromatics of the product, while the MD spray dryer effectively solves the integration problem of the drying tower, the separation chamber and the cooling chamber. In the slow drying stage of spray drying, the temperature of the powder rises as the moisture decreases. In the case of dairy products, when the temperature of the dry air in the lower part of the drying tower is 90 to 100 ° C, the temperature of the powder is about 60 ° C. In order to prevent thermal denaturation, it is desirable to rapidly cool at the end of drying. For this LPG type spray dryer, a flow cooling chamber is installed in the lower part of the drying tower. This system has a cyclone-separated fine powder which is transported by air to a flow cooling chamber at the lower part of the separation chamber, together with the powder separated by gravity in the separation chamber. It is cooled to about 30 ° C and then discharged, and the result has a good control effect on thermal denaturation.
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