Global Concentration Online Observer and Method in Distillation Process Based on Local Concentration Measurement

Abstract

The invention relates to a global concentration on-line observer for rectification process based on local concentration measurement and a method thereof. The on-line observer comprises concentration measurement devices connected with a rectification tower, a local concentration measurement point off-line selection analysis module connected with the concentration measurement device, a data storagedevice connected with the concentration measurement device and a global concentration on-line observer body connected with the data storage device, wherein the local concentration measurement point off-line selection analysis module comprises a concentration distribution description module used for generating analysis data, a sensitivity matrix analysis module used for selecting a first measurement point and a to-be-selected tower plate correlation analysis module for selecting other measurement points. According to the global concentration on-line observer and the method, the local concentration measuring points for the rectification tower are selected and analyzed, the concentration measurement devices are arranged at limited positions of the tower plates, so that the on-line observationof material concentration of all the tower plates is achieved, the quantity of the installed concentration measurement devices is greatly reduced on the premise of ensuring the global concentration observation accuracy, 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 on-line observer and method for global concentration in the rectification process based on local concentration measurement. 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 measurement is one of the means for online monitoring of product purity. In the actual monitoring process, it is impossible to install concentration measuring instruments on each tray of the rectification tower. At present, the commonly used method is to install only a...

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Problems solved by technology

[0003] Concentration measurement is one of the means for online monitoring of product purity. In the actual monitoring process, it is impossible to install concentration measuring instruments on each tray of the rectification tower. At present, the commonly used method is to install only at the top and bottom of the rectification tower. Concentration measuring instruments, through the tower top and tower bottom concentration measuring instruments to measure the product purity at the top and bottom of the tower respectively, this method is not conducive to real-time monitoring of the working status inside the distillation tower

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 material concentration of the tray inside the rectification column has already deviated from the normal range, and only the top of the tower is monitored. and the method of product purity at the bottom of the tower can no longer meet the needs of online real-time monitoring

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