On-line observer and method of global concentration in distillation process based on tray temperature

Abstract

The invention relates to a column plate temperature based distillation process global concentration online observer and method. The observer comprises temperature measuring devices, a local temperature measuring point offline selection analyzing module, a data storage device and a global concentration online observer. The local temperature measuring point offline selection analyzing module and thedata storage device are connected with the temperature measuring devices which are connected with a distillation column, and the global concentration online observer is connected with the data storage device. The local temperature measuring point offline selection analyzing module comprises a concentration distribution description module for generating analysis data, a concentration / temperature conversion module for converting concentration data into temperature data, a sensitivity matrix analysis module for first measuring point selection and a to-be-selected column plate correlation analysis module for selecting measuring points not exceeding concentration distribution parameter quantity. By local temperature measuring point selection analysis of the distillation column, online observation of material concentrations of all column plates can be realized through mounting of temperature measuring devices at limited column plate positions, and high accuracy in global concentration observation, small mounting quantity of the measuring devices and low cost are realized.

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 on-line observer and method for global concentration in the rectification process 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. Products purified by rectification are widely used in daily life and production. The purity control of products is an important goal of the rectification process, which directly affects the economic benefits of the rectification process. [0003] Concentration is an important index to measure product quality. In the actual monitoring process, concentration measuring instruments are usually used to measure the concentration, but the concentration measuring instruments are not only expensive, but also prone to failure. However, the offline ...

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 rectification process with many trays, it is impractical to install a temperature measuring instrument on each tray

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