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[Experience] Desander wear and anti-wear measures
- 2019-11-15-

Common types of wear can be divided into abrasive wear, adhesive wear, erosion wear, fatigue wear, corrosion wear, and fretting wear.

The wall of the sand remover belongs to an annular area. The wear of the area directly visible from the annular space through the entrance is caused by the direct collision of solid particles, but there are also frictional wear and random collision. Above the ring, the main type of wear is friction wear. In the area inside the cyclone sand remover, the main wear modes are friction wear and collision wear. The reason for the erosion of the sand remover wall is: abrasion caused by the direct action of solid particles and the wall of the sand remover; the solid particles have no direct effect on the wall of the sand remover but also wear due to contact; Friction and wear due to slippage between the particles and the wall of the sand remover. Under the microscope it is produced by "micro-cutting" or "ploughing" of solid particles and plastic deformation.

In general, new types of sand eliminators are subject to very severe wear and tear after prolonged work, which affects their service life. There are three main reasons why mechanical devices and their parts do not work properly: fracture, corrosion, and wear failure. In general, the wear process is a slow process that does not immediately have a significant impact, and the results of wear are not the main catastrophic consequences. Therefore, people usually do not pay attention to these small and difficult to observe changes, and they do not care about the severity of the consequences of wear failure. In fact, the impact of these small changes is particularly large. Wear not only causes excessive use of materials and wastes energy, but also directly affects the life of the machine and reliability during use. Therefore, the economic loss caused by wear and tear of mechanical equipment in real life is huge.

In general, there are two ways to extend the life of the sand remover: one is directly affected by the change of the sand remover itself, that is, improving the hardware of the sand remover itself, and the other is to reduce the Initialising speed. The second method is to extend the life by the structure of the sand remover. The most commonly used method is to increase the inlet area, so reducing the initial speed will reduce the impact, but this method will have many other aspects. influences. For example, the efficiency of the sand remover may be reduced, so the method of increasing the inlet area is not very practical.

Some commonly used hardware modification measures include: timely checking the condition of easy-wear parts to make them in a better working state; changing the lining structure on time; using structural materials with high hardness and strong wear resistance to replace wear parts; using refractory materials, Ceramic, brick, or other types of lining to replace worn metal; improve design or structural defects, etc.

Today, cyclones are lined with alumina ceramics that are more resistant to wear and corrosion, and their life can be increased. However, the role of alumina ceramic linings in different parts is not the same. When it is used in places that are prone to wear, such as cones, guide cylinders, underflow ports, etc., its effect is weakened, and the life span is only a few Month, which means that these parts will need to be replaced in a few months. Therefore, its appearance is only a solution to the wear resistance of some parts, and it is not practical for all. Therefore, the problem of cyclone wear is far from solved.

However, the research on anti-wear measures is becoming more and more mature, and many experts have been improving the research, and have developed a new type of composite ceramics with alumina as the main component and different types of additives and tougheners. The emergence of these new materials The abrasion resistance of the cyclone lining is improved, the life is increased, and the impact wear resistance is also increased. In terms of hardness, density, impact wear resistance and flexural strength, it not only meets the requirements of cyclone lining materials, but also has high cost performance, which means that not only practicality but also economical considerations are considered. Therefore, ceramic wear-resistant materials are of great significance for improving the service life of cyclones and slowing down the wear of cyclones. We should continue to study and explore materials with stronger applicability, more wear-resistant and more economical.

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