Common problems of fertilizer drying

The organic fertilizer dryer is a drying machine that can dry a variety of fertilizer materials and is simple and reliable. Because of its reliable operation, strong adaptability and large processing capacity, the dryer is widely used in the fertilizer industry and is deeply loved by users. .

In order to make the dryer safer to use, the following prerequisite work must be done:

1. Check all moving parts, bearings, conveyor belts, and V-belts for damage before work. Any improper parts should be repaired or replaced in time.

2. Lubrication maintenance, add lubricating oil every 100 hours of operation of hot air blower and 400 hours of operation of air cooler The motor works for 1000 hours each, maintenance and replacement of butter. The bearings of the hoist and conveyor are regularly maintained and lubricated.

3. Maintenance of vulnerable parts: bearings, bearing seats, lifting buckets, lifting bucket screws are easy to loose, and frequent inspections and maintenance are required. Conveyor bearings and belt connection buckles should be checked and replaced frequently. Electrical appliances and moving parts should be overhauled frequently. Pay attention to safety when overhauling the top of the tower.

4. Seasonal replacement and maintenance, the dryer should be maintained every working season, the dryer should be cleaned of debris in the air duct, the hoist should be loosened the tension wire, the fan should be attached to the blades, and the hot blast stove exchange should be handled The sedimentation tank accumulates dust, and the pipes are cleaned one by one. The speed control motor speed meter returns to zero and stands by.

5. If the dryer is operated outdoors, corresponding rain and snow protection measures must be taken. The whole machine needs to be maintained and overhauled on a large scale every year, and it needs to be painted for protection every two years.

During the continuous production and use of the dryer, some common problems may occur, such as the problem that the raw materials cannot be dried at one time or the raw materials in the dryer catch fire.

(1) The dryer is too small

Targeted solution: increase the temperature of the dryer, but this method is likely to cause fire in the dryer, the best way is to replace or re-modify the drying equipment

(2) The calculation of wind pressure and flow of the wind network is incorrect.

Targeted solutions: The dryer manufacturers are required to recalculate the air pressure and flow before providing design changes based on actual conditions.

(3) Possible reasons for the fire of raw materials in the dryer:

1. Improper use of organic fertilizer equipment in the dryer.

Targeted solution: consult with the manufacturer to obtain the organic fertilizer equipment manual to learn the correct use of the dryer.

2. The organic fertilizer equipment of the dryer is too small to achieve the drying effect and forcibly heated to cause fire.

Targeted solution: replace or modify the dryer equipment.

3. There is a problem with the design principle of the dryer organic fertilizer equipment.

Targeted solutions: require manufacturers to replace or remodel the dryer equipment.

4. The raw material cannot be sucked away, causing a fire in the dryer.

Targeted solutions: check whether the dryer equipment is installed correctly, whether there is air leakage or increase the wind pressure.

 

Precautions for the use of the dryer:

The installed dryer should be tested in an empty machine for no less than 4 hours, and any abnormal situation during the test run should be dealt with in time.

After the test run is over, tighten all the connecting bolts again, check and replenish the lubricating oil, and start the load test run after the test run is normal.

Before the load test, each auxiliary equipment should be tested in an empty run. After the single-machine test run is successful, it will be transferred to the joint test run.

Ignite the hot air oven to preheat the dryer and turn on the dryer at the same time. It is forbidden to heat the cylinder without turning to prevent the cylinder from bending.

According to the preheating situation, gradually add wet materials into the drying cylinder, and gradually increase the feeding amount according to the moisture content of the discharged materials. The dryer needs a process to preheat, and the hot blast stove should also have a process to prevent sudden fire. Prevent local overheating and damage caused by uneven thermal expansion.

The level of fuel burn value, the quality of insulation of each part, the amount of moisture in the wet material, and the uniformity of the feeding amount affect the quality of the dried product and the fuel consumption. Therefore, to achieve the best possible state of each part is an effective way to improve economic efficiency.

In the working state, the supporting roller frame should be filled with cooling water. All lubrication parts should be refueled in time.

When parking, the hot blast stove should be turned off first, and the drying cylinder should continue to rotate until it has cooled to close to the outside temperature before it can be stopped. It is forbidden to stop at high temperature to prevent bending and deformation of the cylinder.

In the event of a sudden power failure, the hot blast stove should be turned off immediately, the feeding should be stopped, and the cylinder body should be rotated for half a turn every 15 minutes until the cylinder body is cooled. Special personnel should be responsible for this operation procedure. Violation of this procedure will cause the cylinder to bend. Severe bending of the barrel will make the dryer unable to operate normally.

 

Possible failures of the dryer and treatment methods:

1. The discharged material has too high moisture content. At this time, the fuel consumption should be increased or the feed volume should be reduced at the same time. The discharged material has too low moisture content. At this time, the amount of fuel used should be reduced or the amount of feed should be increased at the same time. This operation should be gradually adjusted to a suitable state. Large-scale adjustments will cause the moisture content of the discharge to rise and fall, which will not meet the product quality requirements.

2. The two retaining wheels are repeatedly stressed. For this phenomenon, check the contact between the supporting roller and the supporting belt. If the same set of supporting wheels is not parallel or the connecting line of the two supporting wheels is not perpendicular to the axis of the cylinder, it will cause excessive force on the blocking wheels and also cause abnormal wear of the supporting wheels.

3. This phenomenon is often caused by low installation accuracy or loose bolts, and the supporting rollers deviate from the correct position during work. As long as the supporting wheel is restored to the correct position, this phenomenon can disappear.

4. The large and small gears make abnormal sounds during operation. In some cases, check the meshing gap of the large and small gears. It can return to normal after proper adjustment. The pinion gear is severely worn and should be replaced in time. The gear cover is well sealed to prevent dust from entering, and sufficient lubricating oil and reliable lubrication are the keys to improving the service life of the gear. Thick gear oil or black oil should be added to the big gear cover.

 

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Post time: Oct-05-2022