Powder-making system automatic control method for heat engine plant steel ball coal grinding mill

A technology for steel ball mills and thermal power plants, applied in the field of control, can solve problems such as complex control algorithms, inability to use directly, and operation of coal mills, and achieve the effects of improving economic benefits, improving dust pollution and noise pollution, and reducing vibration of grinding bodies

Inactive Publication Date: 2006-09-27
XI AN JIAOTONG UNIV +1
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Problems solved by technology

However, the ordinary fuzzy control algorithm for this MIMO system cannot be used directly, and the combination of multiple fuzzy controllers will cause the control algorithm to be too complicated.
At the same time, this type of algorithm belongs to the category of fixed value control, so even if it can ensure the stable operation of the coal mill, it cannot make the coal mill run near the maximum output point, thus failing to achieve the effect of energy saving

Method used

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  • Powder-making system automatic control method for heat engine plant steel ball coal grinding mill
  • Powder-making system automatic control method for heat engine plant steel ball coal grinding mill
  • Powder-making system automatic control method for heat engine plant steel ball coal grinding mill

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Embodiment Construction

[0021] see figure 1 , the operating law of the coal mill can be reflected intuitively through its working characteristic curve. It can be seen from the curve 2 in the figure that a very important fact is that the output of the coal mill does not increase monotonously with the increase of the coal stored in it, and the power of the coal mill does not increase with the increase of the coal stored in it. Monotonically increasing, so during the operation of the coal mill, there is indeed an extreme characteristic between the output and the coal storage.

[0022] The automatic control method of the steel ball pulverization system of the thermal power plant adopts a two-layer control structure, the upper layer is a self-optimization algorithm and the lower layer is a multi-dimensional fuzzy control algorithm. The specific control block diagram is shown in the appendix figure 2 . The self-optimization algorithm of the upper layer simultaneously changes the setting values ​​of the ...

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Abstract

The automatic control method for steel ball coal mill in thermal power plant adopts a double-layer control structure, including an upper layer of self optimizing algorithm and a lower layer of multidimensional fuzzy control algorithm. The self optimizing algorithm finds out the optimal inside coal storage quantity inside the coal mill, the optimal outlet temperature of the coal mill and the optimal inlet negative pressure value of the coal mill as the controlling set values; and the multidimensional fuzzy control algorithm realizes the automatic regulation of the coal feed quantity, the hot air valve opening, and the recirculating air valve opening or the cold air valve opening, so as to ensure the safe and reliable running of the steel ball coal mill system in optimal mode.

Description

technical field [0001] The invention relates to a control method, in particular to an automatic control method for a steel ball pulverizing coal pulverization system in a thermal power plant. Background technique [0002] In my country's coal-fired thermal power plants, the steel ball coal pulverization system is widely used. As the key equipment, most of the coal mills are still operating in the original state of human judgment and manual operation. During the operation of the coal mill , Coal blocking, over-temperature, powder running, air leakage, coal shortage and other phenomena occur from time to time, and sometimes even cause equipment damage accidents, resulting in unit shutdown, which brings great economic losses to the power plant. More importantly, the coal mill is a large power consumer in the power plant, and its power consumption accounts for about 20% of the power consumption of the plant. Since the coal mill is still manually controll...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C25/00B02C17/00
Inventor 张彦斌贾立新曹晖司刚全赵德生
Owner XI AN JIAOTONG UNIV
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