Grading method of coal mill steel balls and application thereof

Abstract

The invention discloses a grading method of coal mill steel balls. The method comprises the step of filling steel balls with different sphere diameters in a ball mill according to the following weight ratios: 5-10% of steel balls with sphere diameters of 80mm, 10-15% of steel balls with sphere diameters of 70mm, 8-10% of steel balls with sphere diameters of 60mm; 10-15% of steel balls with sphere diameters of 50mm, 10-18% of steel balls with sphere diameters of 40mm, 12-18% of steel balls with sphere diameters of 30mm, 15-30% of steel balls with sphere diameters of 25mm, and 15-30% of steel balls with sphere diameters of 20mm. The grading method disclosed by the invention is used for reasonably grading the steel balls to reduce the energy consumption of a coal mill while ensuring the output of the coal mill, and meanwhile since the attrition of the steel balls is small, the production cost of the coal mill is reduced.

Description

technical field [0001] The invention relates to a method for grading coal mill steel balls and the application of the method to grinding coal powder for boilers. Background technique [0002] Coal mill steel ball is currently the largest wear-resistant material consumable in the world's crushing industry. It is an important basic component of coal mills, especially precision industrial steel balls play a huge role in the development of the national economy. It is widely used Used in mineral processing, cement plants, power plants, etc. [0003] At present, the steel ball coal mill has been widely used in thermal power generation units in my country. The steel ball coal mill has wide adaptability to coal types, safe and reliable operation, and convenient maintenance. However, its metal consumption is large, and the power consumption of pulverization is high. According to statistics, the steel ball mill generally wears 300-350g per 1 ton of coal milled, and some coal mills ar...

AI Technical Summary

Problems solved by technology

[0004] After investigation, most of the power plants in China adopt the traditional φ40-φ60 gradation ratio for installed balls. Because of the single gradation of the installed grinding balls in the process, the grinding efficiency is low, which greatly wastes national resources. The energy consumption is quite serious, and it also increases the labor intensity of workers, which reduces the profitability of the enterprise to a large extent and affects the normal development of the enterprise.

Images