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FROM: changchenganna
SUBJECT: 4 methods to reduce vertical mill power consumption on GGBFS producction line
Mineral powder vertical mill is a kind of machine used in slag production line
which can be regards as an energy saving machine. The maximum load of the vertical mill system mainly comes from the main motor and the circulating air blower, which approximately takes up 70% power consumption. So, the key of system power saving is reducing consumption of main motor and circulating fan.
1、 Selection of optimum parameters for the system energy consumption of vertical mill
There is no obvious differences of slag vertical mill in working principles, but different process condition, material, operating parameters and methods. So, the operators must observe and analysis the system trending and changing chart on various important parameters such as differential pressure, material-layer thickness, milling pressure, temperature, vibration value, wind consumption, etc. Through the change of continuous multiple points, the law of variation for a certain period of time can be derived, and the random fluctuations and abnormal fluctuations could be judged correctly. When abnormal fluctuations occurs, they can be identified quickly and take measures to solve them only in this way, rather than blind adjusting as soon as slight fluctuation. Therefore, the parameters of lowest energy consumption per unit could be found on the basis of summary judgment, so as to stable running, low consumption, high capacity and operating rate.
During the comparison results, it is not only concern the capacity and quality, but also the per unit consumption, so as to determine whether the operator has the best quality for the selection and control.
2 Reasonable usage and control of system air quantity
The power of circulating fan takes up about 35% of total system power consumption, reducing the air can effectively reduce the fan power consumption. If wrong operation and the system can be controlled by the high speed, the production quality only can be held by increase separator speed. However, in spite of stable running it keeps, the currency of circulating air blower and separator is too high, so as to increase power consumption.
In additional, if wind leaking in the system, which affecting the normal wind supply, it will turn up circulating fan valves. Eventually it will increase the fan loadings and power consumption, affecting mill capacity somehow.
Therefore, controlling the wind supply and avoiding leakage as possible is very important.
3 The adjusting of gear rings
According to the operating conditions, the status of mill plates, rollers and liners must be regularly inspected. Adjusting on time the height of gear ring in case of milling reduction, caused by the thickness of material layers, which can be further results motor loading and currency increasing.
In the meantime, do not ignore the abrasion condition of scraper and the distance to the mill floor, which still can influents system consumption.
4 Increasing capacity and equipment operating rate
Powder mill yields the best performance in the maximum stable capacity. Increasing output is not the simply pursuit of high capacity, but maximize the performance of device in the possible range. Also, the continuous running is necessary. It not only can keep stable working status and appropriate running parameters, but also decreases the power consumption when start/close. So increasing capacity and operating rate, avoiding unnecessary start/stop actions, can reduce system power consumption to a certain extant.
In summary
Emphasizing every step and process in the whole production line and gradually optimizing the whole system can reduce the power consumption, save costs and improve production competitiveness.
As the operators working in frontline on slag production line, it is not only needed to know the new technology and trends, but also master power saving methods and managements, as a result of clear thoughts and direction in managements, and success in energy saving field.

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