Attentions when rotary dryer runs

A rotary dryer is an industrial drum dryer that uses hot air to reduce the moisture content of wet materials. It consists of a large, inclined drum that rotates on its axis while wet solids pass through it. It is used drying sand, stone, soil, coal, ore slurry, sawdust, chicken manure and so on.

As professional rotary dryer manufacturer, We attach great importance to the operating precautions of the dryer machine, which can not only ensure the normal operation of rotary dryer plant, but also reduce the occurrence of mechanical failures. There’re some trial simple instructions about Baichy rotary drum dryer running. To check whether the installation according to the drawing, all connecting bolts are tight, all lubricating points whether foot lubricant brand according to the rules.

No-load test run of rotary dryer

1. The installed rotary dryer machine should be tested for no less than 4 hours without loading, and the current, temperature rise and noise should be checked and recorded.
2. During the test run, it is necessary to pay attention to whether the transmission device has abnormal phenomena such as vibration, impact and noise, the meshing and contact of large and small gears, and the motor temperature rise shall not exceed 40℃.
3. The rotary dryer cylinder should not move or vibrate, and there should be no tremor and obvious vibration.
4. The cylinder and sealing film should be attached to the surface of the cylinder without warping.
5. The amount of lubricating oil at each lubrication point, etc. The bearing temperature rise shall not exceed 60℃.
6. Check whether the connecting bolts are loose, and re-tighten the bolts of each part, especially the large gear matching bolts, the retaining wheel fixing bolts, and the sealing bolts at both ends of the cylinder.
7. Check the meshing of the driving gear and the reducer gear. The meshing surface should not have defects such as pitting, scarring, and scars.
8. After the test run, tighten all the connecting bolts again, check and replenish the lubricating oil, and carry out the load test run after the test run is normal.

Load test run of rotary dryer

1. Before the load test run, each auxiliary equipment should be tested with an empty vehicle. After the single machine test run is successful, it will be transferred to the joint test run.
2. Ignite the hot air furnace dryer for preheating, and turn on the dryer at the same time. It is forbidden to heat the cylinder without turning to prevent the cylinder from bending.
3. According to the preheating situation, gradually add wet materials to the drying cylinder, and gradually increase the feed amount according to the moisture content of the discharged material. The preheating of the dryer requires a process, and the hot air furnace should also have a preheating process. It is forbidden to burn suddenly with a large fire. Prevent local overheating and uneven thermal expansion from causing damage.
4. The fuel value, the quality of the insulation of each part, the moisture content of the wet material, and the uniformity of the feed amount affect the quality of the dried product and the fuel consumption. Therefore, making each part as good as possible is an effective way to improve economic benefits.
5. In the working state, the roller frame should be filled with cooling water. All lubricating parts should be refueled in time.

End the test run of rotary dryer

1. When stopping, the hot air furnace should be turned off first, and the drying drum should continue to rotate until it cools to a temperature close to the outside temperature before stopping. High-temperature parking is prohibited to prevent the drum from bending and deforming.
2. In case of a sudden power outage, the hot air furnace should be turned off immediately, feeding should be stopped, and the drum should be rotated half a circle every 15 minutes until the drum is cooled. This operating procedure should be carefully responsible by a dedicated person. Violation of this procedure will cause the drum to bend. Severe bending of the drum will prevent the sand dryer from being used normally.

The above are rotary dryer attentions analyzed and summarized by our Baichy’s technicians. We hope that users will focus on it and do it well. Baichy technicians have been summarizing through practice for many years and continuously innovating and improving the drying technology level. If users are interested in our drying equipment, welcome to visit our factory and choose the appropriate drying equipment. 

People Also Frequently Asked For-FAQ

1.What is the basic working of a rotary dryer?

Rotary dryers consist of a large rotating cylinder (called the “drum”) set horizontally but at a slight angle. Material passes through the drum and is heated by a heating medium according to a predetermined temperature profile and retention (or residence) time to achieve a target moisture content.

2.How to improve the efficiency of a rotary dryer?

The drying efficiency increased with the increase of the internal temperature and the sludge residence time in the rotary drum, while the drying efficiency decreased when increasing the dryer load. In addition, it was shown that NH3 and CO2 were the primary components released from the sewage sludge drying process.

3. What are the characteristics of rotary dryer?

Moisture content, including inlet and outlet moisture.

Bulk density of the material is needed to determine the sizing of bearings, trunnion wheels, and more; it is an overall indicator on the operational load the dryer must accommodate.