As a key component of the rotating shaft of the cement mill, the contrarotating ring plays a vital role in preventing large particles of dust from entering the sealing chamber, thereby safeguarding the bearings.
The original process for this cement plant spare parts utilises ST 37-2+HVOF with an HRC of approximately 60.
The contrarotating ring creates friction with another sealing part when the spindle is rotating, which over time accelerates the wear of the surface, leading to a decline in sealing performance. Therefore, the maintenance department of the cement plant needs to replace this part periodically.
Due to the high cost of the contrarotating ring produced by the HVOF process, it is necessary to first accurately machine the ordinary steel plate to an outer diameter of 1200mm, an inner diameter of 1010mm, a thickness of 12mm, and to maintain the surface flatness. These production requirements are very high. Subsequently, tungsten carbide must be sprayed on both sides using high-speed oxy-fuel spraying technology. Finally, the surface roughness of Ra1.6 can be achieved through the processing of a large grinding machine.
The high purchase cost of the HVOF contrarotating ring places significant pressure on the user. Following a technical analysis between our customer and Cafu's technical team, it was decided to replace the original cement plant spare parts with a contrarotating ring made of NM400 wear-resistant steel plate. This is a high-quality wear-resistant steel from China that can be used in a wide range of applications that require resistance to abrasion. It is a good alternative to many composite wear-resistant materials.
Cafu has applied its specialised production process to the manufacture of the contrarotating ring, using high-quality wear-resistant steel plates, which are laser cut, lathed and finely ground, to produce the perfect replacement for the high velocity oxygen fuel (HVOF) technology contrarotating ring. The cost is only about one-third of the original cost, which greatly reduces the maintenance cost and creates a greater value return for our cement plant customers.
Cafu, as a leading supplier of spare parts for cement plants, offers a comprehensive range of wear parts, in addition to providing assistance to customers in improving existing processes. Our mission is to provide the best wear-resistant spare parts solutions for users and their shareholders through the implementation of practical projects.
In the process of cement production, coal mill, as one of the important equipment, is responsible for grinding and conveying coal powder, and its stable performance is directly related to the quality and efficiency of cement production.
However, after a period of time, the gap of the grate plate of the coal mill usually closes gradually, resulting in problems such as poor ventilation, accumulation of coal powder, and unqualified fineness, which in turn leads to the emergence of unfavorable factors such as the decrease of coal mill output and the increase of system wear.
In order to solve these problems, the new grate plate after structural improvement is applied in the improvement process of coal mill in cement plant. The improved grate plate of the coal mill adopts a horizontal slit structure, which has some significant features and advantages compared with the original vertical arrangement.
Firstly, the transverse slit structure can effectively improve the ventilation, and by changing the relative angle between the grate plate slit and the direction of movement of the coal mill, it improves the ventilation performance inside the coal mill, maintains good air flow, and reduces the pressure loss in the system.
Secondly, the transverse slit structure can effectively reduce the closing phenomenon of the grate plate slit, making the operation of the grate plate more stable, reducing the problem of coal powder accumulation brought about by the closed slit, and ensuring the normal transportation and grinding process of coal powder.
In addition, the lateral arrangement structure can also effectively reduce the degree of wear of the coal mill and extend the service life of the equipment.
The improved coal mill grate plate structure is applicable to various types of coal mills in cement plants, and has shown excellent adaptability in several coal mill retrofit projects in cement plants.
Cement plants are one of the industries where the improved coal mill grate plate gap structure process is mainly applied. In cement production, coal mills undertake important work tasks, and their stable operation is crucial to the efficiency and quality of the cement production process. By improving the grate plate gap structure, the cement plant can effectively solve the problems caused by the closed gap, improve the performance and service life of the coal mill, and thus improve the quality and productivity of cement production.
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