METHOD AND AIR-SWEPT VERTICAL MILL FOR GRINDING HOT, WET RAW MATERIAL AND ALSO CHANNEL-LIKE SEGMENT

摘要

The invention relates to a method for milling hot and wet raw materials, in particular cement clinker, in a vertical airflow mill (1), to a vertical airflow mill (1), to a device (10) for supplying cooling gas, and to corresponding channel-like segments (20). The device (10) for supplying cooling gas is configured in an annular manner about the entire circumference of the vertical airflow mill (1). Inlet (21) and outlet openings (24) for the cooling gas have an adapted surface which allows an equalization of the inflow cooling air into an increasing airflow/milling particle mixture.

主权项

1. A method for grinding hot, wet raw material, in an air-swept vertical mill,
wherein the raw material is fed to the air-swept vertical mill, ground therein and at the same time dried by means of a hot gas supplied in the lower part of the air-swept vertical mill, and fed to a classifying into defined, channeled out fines and recirculated grit in the upper part of the air-swept vertical mill, wherein by means of a cooling gas introduced in the upper part of the air-swept vertical mill before the classifying a temperature reduction of the air flow—grinding particle mixture fed upwards to the classifying to a defined outlet temperature of the fine material after the classifying is carried out characterised in that the cooling gas is introduced approximately annularly and with substantially radial inflow direction into the air-swept vertical mill and the air flow—grinding particle mixture guided upwards to the classifying.