Cement calciner control method and system based on combined model predictive control technology

Abstract

The present invention relates to a cement calciner control method and system based on combined model predictive control technology. The method is as follows: (1) the central control machine uses the data communication interface to collect the raw material pre-decomposition process data of the cement calciner; (2) classifies the data , carry out model identification separately, obtain the LSSVM steady-state model and ARMAX dynamic model, and combine them into a combined model; (3) Use the combined model with time-delay link to predict the future output state of the material pre-decomposition process, and set the output (4) The nonlinear controller adopts the sequential quadratic programming method to solve the objective function rollingly, and obtains the optimal control value of the cement calciner. Its system includes calciner intelligent measuring instrument, actuator, communication interface and central control computer, and the combined model predictive control algorithm is embedded in the central control computer. The invention has high model identification accuracy, strong algorithm robustness, can adapt to the coupling, nonlinearity and time lag among multiple variables of the calciner, and has good control effect.

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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