The dynamic ring of coal mill is an important part, used for the centrifugal force balance and the axial stability of the rotor. In the modern pulverized coal processing production line, the role of dynamic ring of coal mill is more and more important. Therefore, the production quality and use effect of the coal mill ring are directly related to the stability and safety of the pulverized coal processing line. In China, the production and use of coal mill static rings have been included in the national standard.
1. National standard requirements
In terms of the material, production process and performance indexes of the static ring of coal mill, Chinese national standard GB / T2933-2017 "Technical Requirements for the Production of moving ring and static ring for mechanical sealing" has made detailed provisions. Among them, the requirements of coal mill dynamic ring mainly include the following aspects:
1. Material: Must use high strength and high wear resistance materials, such as high hardness steel, steel-based ceramics, tungsten carbide, etc.
2. Production process: The production of static and static ring requires mastering advanced mechanical processing, welding, heat treatment and other technologies to ensure product quality.
3. Performance indicators: mainly including static pressure sealing performance, thermal deformation and thermal stability energy, wear resistance performance, axial positioning accuracy and other indicators.
2. Possible problems encountered in the implementation and countermeasures
In the actual manufacturing process, there may be some problems, such as the dynamic ring size matching is not close, the dynamic ring temperature rise is too high, the static leakage is too large. These problems will not only affect the stability and performance of the coal mill, but also may lead to equipment failure and safety accidents. Therefore, it is necessary to take corresponding measures to avoid these problems, such as:
1. Strengthen the inspection to ensure that the accuracy of the size, shape and parallelism of the static and static ring meet the standards.
2. Optimize the production process, adopt advanced welding, processing and heat treatment process, to ensure that the quality and performance of the static and static rings are fully guaranteed.
3. Strengthen lubrication and maintenance, reduce the wear and thermal deformation of static and static rings, and improve the service efficiency and life of the equipment.
3. conclusion
The dynamic ring of coal mill is an important part of the stable performance of coal mill, and it has strict national standards for its production and use quality. Attention should be paid to the inspection, production process and daily maintenance of static and static rings, to reduce the wear and failure rate of static and static rings, and to ensure the efficient and stable operation of the coal mill.
