How to reduce the electricity consumption of vertical mills
Release time:
2015-01-13
The vertical mill is an energy-saving and consumption-reducing grinding equipment. In recent years, the technology of vertical mills has developed rapidly, gaining favor from many cement production enterprises and becoming the main equipment in grinding systems. The maximum load of the vertical mill system mainly comes from the main motor of the mill and the circulating fan, with the electrical load accounting for about 70% of the total electricity consumption of the vertical mill system. Therefore, the key to effectively reducing the system's electricity consumption lies in how to reduce the electricity consumption of the main motor and the circulating fan of the vertical mill system. How to reduce the electricity consumption of the vertical mill 1. Selection of the optimal parameters for energy consumption of the vertical mill system The principles of vertical mills are generally similar, but due to different process conditions in various enterprises, different raw material characteristics, and operating parameters,
The vertical mill is an energy-saving and consumption-reducing grinding equipment. In recent years, the technology of vertical mills has developed rapidly, gaining favor from many cement production enterprises, and becoming the main equipment in grinding systems. The maximum load of the vertical mill system mainly comes from the main motor of the mill and the circulating fan, with the electrical load accounting for about 70% of the total electricity consumption of the vertical mill system. Therefore, the key to effectively reducing the system's electricity consumption lies in how to reduce the electricity consumption of the main motor and the circulating fan of the vertical mill system.
How to reduce the electricity consumption of the vertical mill
1. Selection of the best parameters for energy consumption of the vertical mill system
The principles of vertical mills are generally similar, but due to different system process conditions, raw material characteristics, and operating parameters and methods in various enterprises, operators need to pay attention to observing and analyzing key operating parameters of the system during daily production, such as: pressure difference, material layer thickness, grinding pressure, temperature, vibration value, air volume, etc. By analyzing the trend graphs of multiple points continuously, one can deduce the changing patterns over a certain period, correctly judge random fluctuations from abnormal fluctuations, and possess strong predictive ability. Only in this way can one quickly identify and take countermeasures when abnormal fluctuations occur, rather than making adjustments at the slightest fluctuation in the trend graph. This approach ensures stable system operation, achieves high output and high operating rates, and leads to high-quality and low-consumption system operations, ultimately discovering the parameters that minimize unit energy consumption.
When evaluating operational results, it is essential not only to assess the specific output size and quality but also to consider the unit product's energy consumption level, thereby determining whether the operator possesses the qualities to select and control the best parameters.
2. Reasonable use and control of system air volume
The electricity consumption of the circulating fan accounts for about 35% of the total system electricity consumption. Reducing the air volume can effectively lower the fan's electricity consumption. Due to unreasonable mill operation, if the system air volume is controlled too high, it can only be managed by increasing the speed of the classifier to control product quality. Although the mill can operate stably, the current of both the circulating fan and the classifier remains high, leading to increased electricity consumption.
Additionally, when there is air leakage in the system, it affects the normal airflow of the mill, necessitating the opening of the circulating fan valve, which increases the fan load and directly raises the fan's electricity consumption. In severe cases, it can affect the mill's output and indirectly increase the system's electricity consumption.
Therefore, during operation, it is necessary to reasonably control the mill's air volume and minimize system air leakage as much as possible.
3. Adjustment of the material retaining ring
Based on the operating conditions of the mill, it is necessary to regularly check the wear of the grinding table and roller lining, and timely adjust the height of the material retaining ring to avoid reduced grinding efficiency, increased main machine load, and elevated current of the main motor due to excessively thick or thin material layers.
At the same time, the wear of the scraper plate and the gap with the mill's base also affect the system's electricity consumption and must be given attention.
4. Increase output and equipment operating rate
The vertical mill performs best at its maximum stable output. Increasing output is not about pursuing high production but maximizing the equipment's performance within allowable limits. Additionally, production should be organized reasonably to ensure continuous operation of the equipment. Continuous operation not only stabilizes the system and rationalizes parameters but also reduces electricity losses caused by starting and stopping the system and running idle. Therefore, increasing output and equipment operating rates, while avoiding unnecessary starts and stops, can reduce the electricity consumption of the vertical mill system to a certain extent.
Summary:
Every process and link in the grinding system of the vertical mill has potential to be explored and needs to be valued. Through comprehensive optimization of the entire system, the electricity consumption in cement and mineral powder production can be significantly reduced, lowering production costs and enhancing the market competitiveness of product prices.
As a front-line operator of the vertical mill, one must not only understand the current status and direction of technological progress but also master the technical means and management methods for saving electricity consumption, so as to achieve clear direction and correct thinking in management, and to effectively reduce energy consumption.
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