Cement decomposing furnace control method and system based on combined model predicting control technology

Abstract

The invention relates to a cement decomposing furnace control method and system based on a combined model predicting control technology. The method comprises the steps that firstly, a central controlling machine utilizes a data communication interface to collect data of the raw material predecomposition process of a cement decomposing furnace; secondly, the data are classified, model identification is carried out separately, an LSSVM steady state model and an ARMAX dynamic state model are obtained, and the LSSVM steady state model and the ARMAX dynamic state model are combined into a combined model; thirdly, the combined model containing a time delay element is used for predicting a future output state of the raw material predecomposition process, and a reference trajectory of an output value is set; fourthly, a sequential quadratic programming method is adopted on a non-linear controller to carry out rolling solving on a target function, and an optimal control value of the cement decomposing furnace is obtained. The system comprises a decomposing furnace intelligent measuring meter, an actuator, the communication interface and the central controlling machine. A combined model predicting control algorithm is embedded in the central controlling machine. According to the cement decomposing furnace control method and system based on the combined model predicting control technology, the model identification accuracy is high, the algorithm robustness is high, coupling, non-linearity and time lag between multiple variables of the decomposing furnace can be adapted, and the good control effect is achieved.

Description

technical field [0001] The invention relates to the advanced control field of cement raw meal pre-decomposition process, in particular to a cement decomposition furnace control method and system based on combined model predictive control technology. Background technique [0002] The cement calciner is the key equipment in the new dry process cement production process. Most of the carbonates in the raw meal are decomposed in it. The stable and effective decomposition of the raw meal can ensure the long-term stable operation of the entire cement production line. With the country's requirements for economic structure adjustment and energy saving and emission reduction, the research on intelligent control of cement calciner is becoming more and more important. [0003] At present, my country's cement production mainly relies on the operator to operate and control the calciner based on his experience. Due to the uneven operating experience of the operators, it is easy to cause t...

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Problems solved by technology

[0005] In view of the single control variable of the existing calciner control scheme and the inability to adapt to the shortcomings of strong coupling and nonlinear characteristics among multiple variables, the technical problem to be solved by the present invention is to provide a method that can overcome the influence of nonlinearity, strong coupling and large interference. , and can solve the multi-variable control of the calciner, the cement calciner control method and system based on the combined model predictive control technology

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