Intelligent control system for vertical mill based on fuzzy PID (proportion integration differentiation) algorithm

Abstract

The invention relates to the technical field of control on production equipment, and particularly relates to an intelligent control system for a vertical mill based on a fuzzy PID (proportion integration differentiation) algorithm. The intelligent control system comprises the vertical mill, a dust remover and a feeding device, wherein the feeding device comprises an unloader, a bucket elevator and a storage bin; and the intelligent control system is characterized in that an air inlet in the bottom of the vertical mill is connected with a fan via a pipeline, a cold-air device and a hot-air stove are arranged on the pipeline between the air inlet and the fan, a cold-air adjusting valve and a hot-air adjusting valve are respectively arranged on the cold-air device and the hot-air stove, a vertical mill material layer PID controller is arranged on the feeding device, and an in-mill pressure difference fuzzy PID controller is arranged on the cold-air adjusting valve. According to the intelligent control system disclosed by the invention, mathematical models of the change of the vertical mill material layer thickness and an in-mill pressure difference along with parameters of a feeding amount, a mill inlet hot-air temperature and the like can be established only by inputting and outputting data without analyzing the complex grinding process of the vertical mill; and the intelligent control system is simple in process, high in adaptability, fast in the dynamic response time of a controller algorithm, high in robustness, high in control accuracy, and good in market prospect.

Description

[technical field] [0001] The invention relates to the technical field of production equipment control, in particular to an intelligent vertical mill control system based on a fuzzy PID algorithm. [Background technique] [0002] Vertical mill is an ideal large-scale grinding equipment, which is widely used in cement, electric power, metallurgy, chemical industry, non-metallic minerals and other industries. Based on the principle of material bed grinding, it uses the relative movement of the grinding disc and the grinding roller to grind materials. It integrates crushing, drying, grinding, and grading transportation. It has high production efficiency and can grind lumps, granules and The powdery raw material is ground into the required powdery material. As an important equipment in the grinding production process, the vertical mill not only has a wide range of uses, but also has the advantages of high drying efficiency, large feeding particle size, small footprint, low wear, ...

AI Technical Summary

Problems solved by technology

However, this method of manually adjusting the operating parameters has an unsatisfactory control effect and often fluctuates, making it difficult to meet the process requirements and separation efficiency.

However, due to the time-varying, strong coupling and nonlinearity of the vertical mill system, traditional PID control is also difficult to obtain ideal results.

Moreover, the traditional PID control is based on error feedback control. When the system is stable, there are steady-state errors in the system output and control variables, which directly affect the quality of the produced products and the safety of the production process.

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