Abstract
In the whole process of cement production, the electricity consumption of a raw material mill accounts for about 24% of the total. Based on the statistics of the electricity consumption of the raw material mill system of 1005 production lines in China between 2014 and 2019, it is found that the average electricity consumption of the raw material preparation process of all clinker production lines between 2014 and 2019 was 25.2 kWh/t. The average electricity consumption of different-tonnage production lines varies with time. In comparison with high-tonnage ones, the electricity consumption of low-tonnage production lines has wider distribution. The average electricity consumption of raw material mill dropped from 30.88 kWh/t in 2014 to 16.13 kWh/t in 2019, with a drop of more than half. At present, the raw material preparation process of new drying-process cement production enterprises mainly includes middle unloading drying tube mill raw material preparation system, vertical mill raw material final grinding system, and roller press raw material final grinding system. This paper compares the characteristics of several grinding systems and summarizes their influence on the electricity consumption.
Highlights
China is the largest producer of cement in the world [1]
The first is the expanded improvement of the traditional grinding system and the combined use of high-efficiency vertical mills, roller presses, and other types which makes that the high yield and low consumption of the raw material preparation process have reached a considerable level in many cement plants
The following is a detailed introduction to the three mainstream systems, which is convenient for the enterprises to make a reasonable selection and transformation of the raw material mill system in production
Summary
China is the largest producer of cement in the world [1]. The cement production process consists of three mills and one kiln, in which the total electricity consumption of the three-stage mill of raw material, coal powder, and cement products accounts for about. The first is the expanded improvement of the traditional grinding system and the combined use of high-efficiency vertical mills, roller presses, and other types which makes that the high yield and low consumption of the raw material preparation process have reached a considerable level in many cement plants. The automatic control of the mill operating system, the analysis and detection of raw material, and batching and metering have been popularized At this stage, the main focus is on the development from general automatic control to the application of artificial intelligence to carry out professional diagnosis, and cloud computing, etc., combing with analog computing to optimize production and realize intelligent control. We forecast the improvement points of raw grinding technology in the near future, providing a reference for the industry production to further reduce energy consumption and achieve higher efficiency
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