Why is the Output of Cement Vertical Mills Low2020-03-30

Summary´╝ÜCement vertical mill output is getting lower and lower? The reasons involved are all here. The cement vertical mill is a grinding equipment that integrates dryi

Why is the Output of Cement Vertical Mills Low

Cement vertical mill output is getting lower and lower? The reasons involved are all here. The cement vertical mill is a grinding equipment that integrates drying, grinding, powder selection and conveying. It is popular among users because of its small footprint. However, after some equipment is used for a period of time, the output is not as good as before. The following analyzes the factors that affect the output of the cement vertical mill and how to prevent the output from decreasing.

1.Wearing of rollers and disc liners

When the cement vertical mill works, the wear of the roller surface and the disk surface liner is inevitable. As the milling time is prolonged, the wear of the lining plate will become more serious, and the gap between the grinding roller and the disc will become smaller inside and outside, or uneven and uneven shapes. The milling efficiency will be greatly reduced, resulting in a decrease in production. In this case, the wear of the liner should be checked regularly. When the grinding rollers and discs are worn to a certain extent, they must be replaced in time to avoid the vibration caused by the wear of the liner or other problems affecting the operation of the vertical mill. Liner wear should be inspected and handled in a timely manner. The life of the liner can be extended by changing the face of the liner and appropriately lowering the height of the retaining ring.

2.Abrasion of the retaining ring

Vertical Mills

The function of the abrasive stop ring is to enable the material to be fully ground on the grinding disc. The material retaining ring is worn or dropped, reducing the thickness of the material layer, the vibration of the cement vertical mill will become larger, and the coarse powder is not fully ground. The centrifugal force will throw out the grinding disc, increase the amount of material returned, and enter the total grinding. The amount has also increased, which can only reduce production. Therefore, it is necessary to regularly check the stop ring and deal with it in time when problems are found.

3.Abrasion of nozzle ring

The main function of the nozzle ring of the cement vertical mill is to change the wind direction through the guide blades to ensure that the airflow rotates upward and takes away the material. If the nozzle ring is worn or locally abraded, the airflow becomes chaotic, and a stable upward spiral airflow cannot be formed, and the wind speed will also be reduced. The material cannot be taken away in time. Mill output.

4.Performance of grinding materials

The hardness of the materials to be ground is large. In order to achieve qualified raw materials, the grinding time of the materials will be prolonged, and the internal circulation of the mill will be increased. The granularity of the material to be ground is too large, which will increase the number of grindings, increase the circulation, increase the pressure difference, be difficult to grind, and cause vibration. Therefore, the operation of the mill should be controlled according to the actual situation of the user's raw materials and the abrasiveness and particle size of the material, so as not to affect the output.

5. System leak

The air leakage of the cement vertical mill body will cause a small pressure difference and insufficient wind speed, and the powder cannot be taken away in time, which affects the mill output. In addition, air leakage in other parts of the system will reduce the wind speed and cause pipeline accumulation. After the pipe accumulates, the ventilation area will become smaller, and the insufficient air volume will also affect the mill output. Therefore, it is necessary to timely check and handle the air leakage of the system.

6.Layer thickness

After the material is fed into the grinding disc, a certain material layer is formed. When the thickness of the material layer reaches a certain thickness, the grinding roller starts to grind. If the material layer is too thin, the grinding stress is too concentrated, and the grinding capacity will be reduced, which will cause the impact of the roller lining and the disk lining. The mill has a large vibration and is easy to jump. Thin layer control. If the thickness of the material layer is too thick, the milling force will be converted into lateral stress, sliding shear will be formed between the materials, the slump of the material bed will increase, the milling efficiency will decrease, and the vibration will also be large. At the same time, the material could not be ground in time and squeezed out of the grinding disk, fell to the nozzle ring, increased the circulation volume, and the pressure difference was large. The thickness of the material layer is generally controlled to be about 50-80mm.

In addition to the above factors, there are many factors affecting the output of the cement vertical mill, such as air volume control, hot air temperature control, batching control, etc., will affect the output of the vertical mill. In actual production, it should be analyzed according to the specific situation and then resolved.

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