How to troubleshoot spray dryer faults?

spray dryer fault problem

1. Reasons for material sticking to the wall:

1. The feed volume is too large to fully evaporate;

2. The drying chamber is not heated enough before spraying;

3. When starting to spray, the feed flow rate is adjusted too large;

4. The added liquid is unstable.

2. Measures to be taken for material sticking to the wall:

1. Appropriately reduce the amount of feed;

2. Appropriately increase the inlet and outlet temperature of the hot air;

3. At the beginning of spraying, the flow rate should be small, gradually increase, and adjust until appropriate;

4. Check whether the pipeline is blocked, adjust the solid content of the material, and ensure the fluidity of the material and liquid.

5. The moisture content of the product is too high, and the exhaust temperature is the main factor affecting the moisture content of the finished product. Therefore, the reason for the high moisture content of the product is generally that the exhaust temperature is too low. The exhaust temperature can be adjusted by the amount of feed. Therefore, the corresponding measure is to appropriately reduce the feed volume to increase the exhaust air temperature.

3. Reasons for low product purity and excessive impurities:

1. Poor air filtration effect;

2. The accumulated powder is mixed into the finished product;

3. The purity of raw materials is not high;

4. The equipment is not cleaned thoroughly.

4. Remedial measures for low product purity and excessive impurities:

1. Check whether the filter material in the air filter is evenly laid and whether the filter has been used for too long;

2. Check the coke powder at the hot air inlet to overcome the eddy current;

3. The material liquid should be filtered before spraying;

4. Clean the equipment again.

5. Reasons for the serious running-out phenomenon and low product yield:

Excessive powder loss will greatly affect the yield of the finished product. The general reason is the poor separation effect of the cyclone separator. If this happens, check whether the cyclone separator is deformed due to knocks or collisions; improve the air-tightness of the inlet and outlet of the cyclone separator, and check whether the inner wall and the discharge port are blocked by material accumulation. Of course, the separation efficiency is also related to the specific gravity and particle size of the powder. For some materials, a second stage dust removal can be added as needed.

6. There is noise or vibration when the centrifugal nozzle is running

1. Mainly due to the improper cleaning and maintenance of the nozzle, residual substances in the nozzle or the bending and deformation of the spindle may be caused by the poor dynamic balance of the centrifugal disk. Solution; 

2. Check whether there are any residual substances in the spray pan, and clean it if there is any;

3. If the spindle is found to be abnormal, replace it;

4. Readjust or replace the dynamic balance of the centrifugal disc.