Moving spraying nozzle ring and preparation method thereof

Abstract

The invention belongs to the technical field of wear-resistant materials, and particularly relates to a moving spraying nozzle ring and a preparation method thereof. The moving spraying nozzle ring isprepared from the following chemical components in percentage by weight: 1.5-2.9% of carbon, 1.2-2% of silicon, 0.6-0.9% of copper, 0.4-1.0% of manganese, 14-17% of chromium, 0.05-0.2% of molybdenum,0.1-0.2% of nickel, 0.05-0.20% of boron, 0.005-0.04% of phosphorus, 0.005-0.04% of sulfur, and the balance of iron. A formula is reasonable, manufacturing is easy, the service life is long, quite high strength, toughness, wear resistance and impact resistance are achieved, the frequency of replacing a clamping plate in a factory is reduced, the labor intensity is lowered, raw materials are easy to obtain, a production method is simple, and energy is effectively saved.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant materials, and in particular relates to a movable nozzle ring and a preparation method thereof. Background technique [0002] The static ring and dynamic nozzle ring designed on the existing vertical mill equipment are extremely worn, and the service life can only be maintained at about 6000 hours to 8000 hours, and the dynamic and static rings are integrally cast, which directly affects the quality of use after wear. It can only be replaced as a whole, which increases the workload of on-site inspection and maintenance and increases the maintenance cost. The situation that the dynamic and static rings are easy to wear has become the main factor that seriously restricts safe production. [0003] After long-term on-site tracking and testing, the main defects in the operation of the vertical mill are summarized as follows; [0004] 1. Serious wear: After the equipment has been in operation fo...

AI Technical Summary

Problems solved by technology

[0006] After on-site wear and tear, the gap between the dynamic and static rings increases, resulting in a decrease in wind speed, resulting in an increase in the amount of pebbles and coal and serious powder inclusions. According to the size after wear, the actual wind speed is only below 60m / s, which is much higher than the design wind speed of 70m / s. ~75m / s is small, so the rigidity of the air column at the nozzle outlet is not enough to hold up a large amount of coarse powder mixture thrown from the grinding table and transport it to the dynamic separator, and the stones and coal powder cannot be separated well, resulting in the discharge of stones powder in coal

[0007] 3. Due to the frequent sintering of coal powder, the sanitation conditions on site are poor:

[0008] Because the coal powder is contained in the pebbles, the coal powder is easy to generate self-combustion knots in the upper buffer bucket and the pebble coal assembly box, and the door panel is bent and deformed after burning; when the door panel is opened and closed, the coal powder is dragged to rub the packing seal, which will quickly cause air leakage from the packing. Speed ​​up the spontaneous combustion of pulverized coal

Leakage of pulverized coal caused poor sanitation at the site, and powder accumulated everywhere, which seriously affected the site environment

[0009] To sum up, because the dynamic and static rings work under very harsh conditions and are made of non-wear-resistant materials, the service life is short and the wear is serious

The structural design of the dynamic and static rings is unreasonable. The dynamic nozzle ring adopts open nozzles. During operation, the falling stone coal is sandwiched between the gap between the dynamic nozzle ring and the static ring. With the relative movement of the dynamic and static rings, the static ring and the upper guide cone Wear and tear, maintenance and replacement are extremely inconvenient, greatly increasing production costs