Global State Observer and Method for Internal Thermally Coupled Distillation Column Based on Tray Plate Temperature

Abstract

The invention relates to a global state observer and method for an internal thermally coupled rectification process based on tray temperature, the observer includes a temperature measuring device connected to the internal thermally coupled rectifying tower, and local temperature measuring points respectively connected to the temperature measuring device Offline selection analysis module and data storage device, and global concentration online observer connected to the data storage device; local temperature measurement point offline selection analysis module includes mechanism model description module, sensitive plate analysis module, concentration distribution description module, concentration / temperature conversion Module, Sensitivity Matrix Analysis Module and Correlation Analysis Module of Tray to be Selected. The present invention selects and analyzes the local temperature measurement points of the internal heat-coupled rectification tower, and realizes the online observation of the temperature and material concentration of all trays on the global state by installing a temperature measuring device at a limited number of tray positions, with high accuracy and the installation of the measuring device The quantity is small and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of on-line observation in the rectification process, and in particular relates to an internal heat-coupled rectification column global state observer and method based on tray temperature. Background technique [0002] The rectification process is a widely used operating unit in the chemical process, mainly used for the separation and purification of various mixtures. The energy consumption of the rectification process is huge, accounting for about one-third of the energy consumption of petrochemical industry. However, the energy utilization rate of the rectification process is less than 10%, resulting in serious energy waste. [0003] The internal thermally coupled rectification column separates the entire rectification process into the high-pressure column and the low-pressure column, and performs heat exchange between the high-pressure column and the low-pressure column, so as to make full use of the inter...

AI Technical Summary

Problems solved by technology

Due to the large time lag in the rectification process, when there is a problem with the product purity at the top and bottom of the tower, the fault or abnormality has already occurred, and the temperature of the tray inside the rectification tower has already deviated from the normal range. Only the top and bottom of the tower are monitored. The method of tower bottom temperature can no longer meet the needs of online real-time monitoring, and for the internal thermally coupled rectification process with many trays, it is impractical to install temperature measuring instruments on each tray

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