A cement vertical mill grinding device and grinding method

By adding static grading and dynamic powder sorting sections above the vertical mill, the problem of unbalanced material distribution in the grinding disc was solved, improving the grinding efficiency and operational stability of the cement vertical mill, and reducing energy consumption and equipment resistance.

CN122298549APending Publication Date: 2026-06-30TIANJIN CEMENT IND DESIGN & RES INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN CEMENT IND DESIGN & RES INST CO LTD
Filing Date
2026-04-28
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In the cement production process of grinding large amounts of fine admixtures, the imbalance of the material layer in the grinding disc and the difficulty of the grinding rollers in compacting the material lead to problems such as large mill vibration and low operating power.

Method used

A static grading section and a dynamic powder sorting section are added above the grinding section of the vertical mill. The static grading pre-sorts the fine powder to ensure a reasonable particle size distribution in the grinding disc material layer. The airflow carries away the fine powder, while the coarse particles fall back to the grinding disc. Combined with the dynamic powder sorting section, a secondary fine separation is performed to form a reasonable material layer structure.

Benefits of technology

It improved the grinding efficiency of the grinding rollers, reduced equipment resistance and operating energy consumption, enhanced powder selection accuracy and finished product quality, and stabilized mill operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a cement vertical mill grinding device and grinding method. The grinding device includes a vertical mill grinding section, a static grading section, and a dynamic powder sorting section installed in a tower-type shell. The static grading section is located above the grinding rollers and has air inlet and outlet guide baffles and a feeding device. Its air inlet is connected to the rising airflow of the grinding section. The dynamic powder sorting section is located above the static grading section, and its air inlet is connected to the air outlet channel formed by the air outlet guide baffles. Both the static grading section and the dynamic powder sorting section have discharge ports pointing towards the grinding disc. This invention, through a combined static and dynamic step-by-step sorting logic, allows materials to undergo static pre-sorting to remove fine powder before entering the grinding zone. This fundamentally solves the problems of unbalanced material layer distribution on the grinding disc and insufficient material compaction by the grinding rollers caused by large amounts of high-fineness admixtures, significantly improving grinding efficiency and material layer stability, and effectively reducing system load and operating power consumption.
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