Double-layer-structure predication control method applicable to middle-discharging type cement raw material mil system

Abstract

For the characteristics that a middle-discharging type cement raw material mill system is provided with two control loops of a coarse powder bin and a fine powder bin, the coupling action exists between the coarse powder bin and the fine powder bin and the load of the two bins needs to be coordinated and optimized, the invention adopts a double-layer-structure predication control method with two layers of optimization and control to carry out independent optimization and control on a control system. A steady optimization layer realizes the load optimization on the coarse powder bin and the fine powder bin according to the economic optimization index; a dynamic control layer selects milling noise and the negative pressure of an inlet of the fine powder bin as output variables, selects the feeding amount and the openness of a distributing valve as input variables, and selects the rotating speed of a powder selecting machine as a feed-forward variable so as to form a two-input two-output one-feed-forward multi-variable predication control system. The double-layer-structure predication control method has the advantages that the total load level of a raw material mill is effectively improved, the mutual coupling action when the coarse powder bin and the fine powder bin are respectively controlled is avoided, the influence of lagging of the feeding amount is reduced, the disturbance action of quality adjustment on a product on the control system is inhibited, the automation degree is improved, the yield of raw materials is increased, the continuous operation rate of the control system is increased and the economic benefit is increased for enterprises.

Description

technical field [0001] The invention relates to an optimized control method suitable for a mid-unloading cement raw material mill system, which belongs to the field of advanced process control in the process industry. Background technique [0002] The mid-unloading cement raw meal grinding system is a relatively complex process in cement raw meal grinding. It can be said to be a subdivision of the ordinary ball mill process. It is divided into two parts: the coarse powder bin and the fine powder bin: the coarse powder bin is Steel balls are mainly used for grinding raw materials with relatively large particle sizes; the steel section in the fine powder bin is mainly used for grinding raw materials with small particle sizes. Process flow chart such as figure 1 As shown, the solid line in the figure is the material flow, and the dotted line is the air path. The cement raw material grinding system is mainly composed of a mid-loading ball mill and a powder separator. The ball ...

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Problems solved by technology

[0008] 3. Uncertainty in raw material grindability

[0009] The cement raw meal grinding process requires a large amount of raw materials. Limited by personnel, equipment and other factors, frequent detection of the chemical composition of raw materials cannot be realized, resulting in large deviations in the chemical composition data of raw materials used in the batching system.

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