Internal thermal coupling rectification control method and device based on temperature wave model predictive control

Abstract

The invention relates to an internal thermal coupling rectification control device based on temperature wave model prediction control. The internal thermal coupling rectification control device comprises an internal thermal coupling rectification tower, an intelligent meter, a control station, a data storage device and an upper computer, wherein the intelligent meter is connected with the internal thermal coupling rectification tower; the control station is connected with the internal thermal coupling rectification tower; the data storage device is connected with the intelligent meter and the control station; the upper computer is connected with the data storage device and the control station and comprises a concentration gradient description module, a temperature gradient description module, a temperature wave static description module, a temperature wave dynamic description module, a set value conversion module and a control parallel solving module. A nonlinear control scheme of the internal thermal coupling rectification control device is constructed on the basis of a high-precision nonlinear temperature wave model, so that the interference can be suppressed in time; the coupling problem is better processed, and the change of a set value can be quickly and accurately tracked; due to the temperature with high measurement precision and small measurement time delay as a main control measure, the control speed and the control performance are greatly improved.

Description

technical field [0001] The invention belongs to the field of nonlinear control in rectification energy-saving process, in particular, relates to an internal thermal coupling rectification control method and device based on temperature wave model predictive control. Background technique [0002] The energy consumption of the distillation process accounts for 20% of the total energy consumption of the national economy and 67% of the petrochemical industry. It is a unit operation widely used in petroleum, chemical, metallurgy, coal chemical and other industries, and is closely related to many pillar industries of my country's national economy. However, the energy utilization rate of the rectification process is extremely low, only 5%-10%, which seriously restricts the economic development. [0003] The internal thermal coupling rectification technology makes full use of the heat exchange between the rectification section and the stripping section, saving energy by more than 30%...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the aforementioned deficiencies such as low online operation efficiency, poor interference suppression ability, poor control effect, and low sensitivity to noise existing in the existing internal thermally coupled rectification control device, and provides an internal temperature wave model-based predictive control. Thermal coupling rectification control method and device, the control device can realize accurate and rapid set value tracking, has the advantages of fast online operation speed, strong anti-noise ability, good control effect, etc.

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