Rectification tower automatic control and optimization method

Abstract

The invention relates to a method for controlling and optimizing the distillation tower. It controls the distillation tower in dependence on the material balance relation and component balance relation, optimizes the distillation tower by using representative model. Employing the abstraction proportion between the light product on the top of the tower and heavy product in the bottom of the tower (in following, taking the proportion between light and heavy product for abbreviation) as main controlled variable depending on the distillation principle, the material balance and component balance in the distillation tower, controlling the proportion between the light and heavy product, temperature, reflux ratio to realize stable operation by regulating the quantity of reflux and heat load of re-boiler. Simulating the practical course through the technological process simulation software, and training the nerve net model to become the representative model for the course optimization. Optimizing the operation with the representative model by using the analytical data for the raw material and product to realize the product Ka bian optimization, increasing the productivity of product with high value on the condition of guaranteeing the product quality and realizing the device energy saving and consumption reduction.

Description

technical field [0001] The invention relates to an automatic control and optimization method of a rectification tower, and belongs to the field of automatic control of a chemical rectification tower and production process. Background technique [0002] In the process of petroleum refining and chemical industry, almost every device involves the liquid-liquid separation process, and the rectification tower is the main process unit to realize the liquid-liquid separation of miscible substances. [0003] Distillation towers can be divided into two types according to the number of products and separation precision: one is called fractionation tower, and its purpose is to divide the raw materials such as petroleum with very complicated composition into multiple products according to the distillation range. There are multiple product side lines outside the bottom, such as the atmospheric distillation tower of the atmospheric and vacuum unit, the main fractionation tower of the cata...

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Problems solved by technology

This is also not conducive to control schemes based on product quality soft-sensing

[0007] According to the analysis of the operation process of the actual distillation column and the simulation research based on the process simulation software, it is found that when the operating conditions of the distillation column change, the product quality changes and reaches a stable time for a long time, but the light product at the top of the tower and the heavy product at the bottom The withdrawal ratio will produce rapid and obvious changes, and often oscillate, which is the main reason for the operation instability of the tower

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