Small spray dryerDuring operation, various faults may be encountered. Here are some common fault diagnosis and troubleshooting methods:

　　1、 Troubleshooting of Atomization System

1. Uneven atomization

Possible reasons: Wear of atomizing disc or nozzle, inappropriate material viscosity or solid content, unstable atomizer speed.

Solution: Replace worn atomizing discs or nozzles, adjust material viscosity or solid content, check and stabilize atomizer speed.

2. Nebulizer blockage

Possible reasons: The material contains large particles or impurities, the material viscosity is too high, and the atomizer cleaning is incomplete.

Solution: Filter the material, remove large particles and impurities, adjust the viscosity of the material, and clean the atomizer. For organic solvent spray dryer, cold dredging (applicable to low melting point materials) or hot dredging (applicable to heat sensitive materials) can be used.

3. Excessive vibration of atomizer

Possible reasons: Unbalanced atomizer, worn or damaged bearings, and unstable installation.

Solution: Rebalance the atomizer, replace worn or damaged bearings, check and tighten installation components.

　　2、 Troubleshooting of Heating System

1. Insufficient or fluctuating heating temperature

Possible reasons: heater fouling, damaged heating element, mismatch between air volume and heating.

Solution: Regularly clean the fins with compressed air or specialized cleaning agents (avoid rinsing live parts with water), test component resistance values or unclog nozzles, replace faulty components, adjust fan frequency to reduce air volume, or check if the heating control module parameters are offset, recalibrate PID parameters.

2. Abnormal or fluctuating hot air flow rate

Possible reasons: pipeline blockage, fan failure, malfunction of air damper adjustment.

Solution: Disassemble the pipeline to clean the accumulated powder, replace or clean the primary and intermediate efficiency filters (recommended to check every 200 hours), stop the machine to clean the impeller, add lubricating grease to the bearings (every 2000 hours), and replace the bearings in severe cases. Check the power supply and mechanical connections of the actuator, and recalibrate the opening of the air door.

　　3、 Troubleshooting of material related issues

1. Material adhesion problem

Possible reasons: The inlet air temperature is too low, the atomized particle size is too large, and the airflow distribution in the drying chamber is uneven.

Solution: Increase the inlet air temperature by 5-10 ℃, reduce the atomization pressure (such as from 20MPa to 15MPa), adjust the baffle angle to 45 ° to optimize the airflow, and add anti adhesive agents (such as 5% -10% micro powder silica gel or diatomaceous earth).

2. Material clumping

Possible reasons: The material humidity is too high, the drying temperature is too high, and the drying speed is too fast.

Solution: adjust the humidity of materials before entering the drying tower, reduce the drying temperature, appropriately extend the drying time, and control the drying speed within a reasonable range by adjusting the spray speed and air volume.

3. There are a large number of impurities in the product

Possible reasons: The material contains impurities, the purity of the raw material solution is not high, and there are impurities in the equipment.

Solution: Check the air filter and replace the filter screen according to the situation; Sampling and testing of the liquid material, filtering impurities in the liquid material; Regularly clean the equipment to remove impurities.

　　4、 Control system and electrical troubleshooting

1. The device cannot start

Possible reasons: power supply issue, control circuit malfunction, sensor malfunction.

Solution: Check if the power plug is plugged in properly, if the power switch is turned on, use a multimeter to inspect various components in the control circuit, and check if the sensor connections are secure, loose, or detached.

2. Failure of temperature control system

Possible reasons: scaling or displacement of thermocouple probe, damage to heating tube, adhesion of solid-state relay contacts.

Solution: Clean or replace the thermocouple, use a multimeter to measure the resistance of the heating tube (normal value of 50-100 Ω), and replace damaged components.

　　5、 Other common troubleshooting

1. Serious phenomenon of losing followers

Possible reason: There is a problem with the cyclone separator, resulting in low dust removal performance.

Solution: Check if there are gaps in the cyclone separator, if the air tightness is intact, and add secondary dust removal appropriately.

2. The equipment operates with high noise levels

Possible cause: issues with the atomizing disc and bearings.

Solution: Check if the atomizing disc is balanced, if the bearings are working properly, and if the lubrication is correct. If there is any damage, it should be repaired or replaced immediately.

3. Low drying efficiency

Possible causes: hot air furnace failure, mismatch between spray speed and hot air flow, unreasonable material formula and drying process parameters.

Solution: Check whether the hot blast stove operates normally, repair it in time if there is any fault, adjust the spray speed and hot air flow, and improve the drying efficiency.

Please note that the above troubleshooting methods should be adjusted according to the specific equipment model and operating conditions. It is recommended to conduct regular equipment maintenance and establish a preventive maintenance plan to reduce the incidence of malfunctions. For complex faults, it is recommended to contact the equipment manufacturer or professional maintenance personnel for handling.