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

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 of a steel ball mill pulverizing system in a thermal power plant. Background technique [0002] In my country's coal-fired thermal power plants, the steel ball mill pulverization system is widely used. As the key equipment, most of the coal mills are still running in the original state of human judgment and manual operation. , coal blocking, over-temperature, running powder, 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 controlled, the coal mill cannot always run at the optimum. Under the working conditions...

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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

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