OPERATING EXPERIENCE WITH THE LARGEST ROLLER MILL - THE QUADROPOL~C 61/30 FOR RAW MATERIAL GRINDING

摘要

The Quadropol Roller mill was developed and introduced with the aim to have a high efficient, most reliable compact raw grinding system to serve high capacity modern Clinker production lines with the required raw meal. After developing the mill in the 1990's and commissioning a small industrial prototype Polysius got the contract to build a Quadropol 81/30 for Gulf Cement in Ras Al Khaimah UAE for 800 t/h. With 7000 kW installed power this mill became the largest vertical roller mill ever build. The concept of the Quadropol with 4 rollers running on an outer track of the grinding table with only the solid grinding rolls and table liners inside of the grinding chamber is the basis for highest capacity and the superior reliability and availability of this grinding system. AH sensitive and critical components of the mill, bearings and grinding pressure system are placed outside of the rough environment of the grinding chamber and give easy access for supervision and maintenance. The form and arrangement of the roller units and the grinding tools are the basis for stable capacity and a long services life without loosing performance. Further more it is possible to operate the mill system with 2 roller only at about 65 percent of the rated capacity in case one or two roller are on service. In this paper the experience with the largest vertical roller mill in operation with 7000kW are given.