Calcination predictive control system and method for rotary cement kiln

Abstract

The invention relates to a calcination predictive control method and a calcination predictive control system for a rotary cement kiln. The method comprises the following steps of: (1) acquiring field data of the calcining process of the rotary cement kiln and classifying the field data; (2) respectively carrying out model identification on the data and organically combining the data to establish a prediction model; (3) carrying out prediction on historical and future data information on the calcining process by the prediction model to obtain an output of the calcining process and outputting error feedback correction by utilizing the model to obtain a closed-loop prediction output of the calcining process; and (4) according to the closed-loop prediction output and a reference output trace,constructing a non-linear target function and carrying out solution of a optimal solution on the target function by using a sequential quadratic programming method to obtain a predicted value of the calcination controlling quantity. The system comprises an intelligent detection instrument and an actuator which are connected with the rotary cement kiln, a data storage device and an upper computer,wherein a calcination predictive control algorithm is embedded in the upper computer. The calcination predictive control method and the calcination predictive control system for the rotary cement kiln can be suitable for the dynamism of the calcining process of the rotary cement kiln and the coupling, nonlinearity and obsoleteness between multiple variables, and obtain good control effect.

Description

technical field [0001] The invention relates to the field of advanced control of the cement production process, in particular to a system and method for predicting and controlling the calcining process of a cement rotary kiln. Background technique [0002] Cement rotary kiln calcination is a very typical and important link in the cement production process, and its operation quality directly affects the quality, production capacity and production cost of cement. The quality of cement rotary kiln calcination largely depends on its control method, so the advanced control method of cement rotary kiln calcination has attracted more and more attention and attention at home and abroad. [0003] The reason why the calcination of cement rotary kiln is difficult to control is mainly due to its complex variable coupling, nonlinearity and time delay. In addition, the most important controlled variable - kiln temperature, it is also difficult to accurately select its detection point , b...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing cement rotary kiln control schemes that cannot adapt to the strong coupling between variables in the calcination process, strong nonlinearity, time lag between variables, and failure to obtain good control effects, the present invention provides a solution that can solve Combination model-based predictive control method and system for cement rotary kiln calcination process with variable coupling, large time-delay, and system nonlinear problems in the calcination process and good control effects

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