Automatic control system and method for controlling reflux of light component removal rectifying tower

Abstract

The invention provides an automatic control system for controlling the reflux of a light component removal rectifying tower. The automatic control system comprises a reflux drum communicated with a rectifying tower, an executing mechanism arranged on a discharge pipeline of the reflux drum and used for regulating the reflux ratio of fractions in the reflux drum, a pressure controller for acquiring the pressure value of the rectifying tower and providing the pressure control variable for a signal selector according to the pressure value, a temperature controller for acquiring the temperature value of the reflux drum and providing the temperature control variable for the signal selector according to the temperature value, and the signal selector for receiving the pressure control variable and the temperature control variable, and selecting one of the variables to control the opening of the executing mechanism. Through the correlation of the temperature and the pressure parameter in the system with the action of the discharge valve of the reflux drum, the action of the discharge valve is controlled in real time according to the state in the system, so that the product quality unstability or the material waste due to excessive emission is avoided.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to the field of automatic control of chemical production. Background technique [0002] In the chemical industry, it is almost an essential operation to separate a variety of substances with different specific gravity and boiling point. This is usually carried out in a distillation tower or a separation tower (usually a rectification tower), and heat is supplied to the distillation tower through a heating device , output light distillate or low boiling point distillate from the top of the tower, and heavy distillate or high boiling distillate stay in the bottom of the tower and separate from the bottom of the tower. The heating unit is usually a coil of tubing that surrounds a portion (usually the lower portion) of the distillation column through which a heating medium (typically oil, water, gas, etc.) flows. In order to adjust the heat supply and control the tower temperature, it ...

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Problems solved by technology

[0005] There is no automatic control system or method for the discharge ratio of the reflux tank disclosed in the prior art

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