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| Energy Saving Retrofit for Coal Powder Preparation Process Using Combined Vertical Roller Mill and Ball Mill Final Grinding |
| WANG Yongqin, NIE Jian, FANG Yan, ZHANG Weili, YE Weidong
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CNBM Equipment Group, Hefei Zhongya Building Material Equipment Co., Ltd. , Hefei Anhui 230051, China
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Abstract The ball mill coal powder preparation system of a new dry process cement clinker production line with a capacity of 5 000t/d has problems such as low output (50~55t/h) and high energy consumption (32~33kW·h/t). A modification plan using the "vertical roller mill pre grinding + ball mill final grinding" grading grinding process is proposed, and the grading grinding process flow of vertical roller mill coarse grinding and ball mill fine grinding is introduced. During the renovation, a three roll vertical roller mill with a nominal diameter of 3 500mm and an external structure dynamic and static powder selector were used. An independent feeding shell was added to the original upper shell of the vertical roller mill, and simulation optimization was carried out on key parameters of the vertical roller mill. After the renovation, the average output of the coal powder preparation system increased by 100% (about 110t/h); The total power consumption of a single machine is 19~20kW·h/t, which is about 40% lower than that of a single ball mill for grinding, achieving the dual goals of increasing production efficiency and energy conservation and consumption reduction.
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Received: 31 March 2025
Published: 22 September 2025
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