SU1430053A1 - Method of automatic regulation of heat conditions of fractionating tower - Google Patents

Abstract

The invention relates to methods for automatically adjusting distillation columns using ohmic heating of the bottom liquid and improves the accuracy of adjusting the distillation process and stabilizes the quality of the separation products. When implementing the method, the temperature of the bottom liquid circulating through the heater is measured, before and after heating, the power consumed by the heater, the flow of the bottom product, the flow rate of the bottom liquid circulating through the heater is calculated and depending on the ratio of the bottom liquid flow circulating through the heater and the bottom product adjust the power consumed by the heater. 1 il. (C (L

Description

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The invention relates to the automation of t (flat-exchange processes, in particular, to (automatic regulation of distillation columns, and can be used in the chemical, petrochemical, and petroleum refining industries.

The purpose of the invention is to improve the accuracy of controlling the thermal mode of the column and stabilize the quality of the products obtained.

1 The drawing shows a schematic diagram, according to which the proposed method is implemented.

 The method is carried out as follows.

1 The initial mixture (L) is fed to the plate | at the power supply of the column 1. Its flow rate is maintained at a predetermined level by the regulator 2 and acting on the valve with an operating mechanism 3. The regulator of the bottom liquid level 4 by means of 20 Fapana with actuator 5 Supports the desired consumption of the bottom Product (R). A remote heater is located in the lower part of the column (boiling G / R, the computing device generates a correction signal that appropriately changes the amount of power consumed by the heater and, consequently, the amount of heat supplied to the bottom of the column.

For example, in the case of a change in the flow rate of the bottom liquid R when the flow rate of the initial mixture is changed. Thus, with a decrease in the flow rate of the initial mixture, the consumption of the bottom liquid is correspondingly reduced. In this case, the ratio G / R will become more units (). From a physical point of view, there will be a decrease in the amount of the mixture to be separated, and consequently, a decrease in the amount required for energy separation.

At the time of the change in the flow rate R, when the ratio is fixed by the computing device, it will produce a correction signal for the downstream power control setpoint. The power consumed by the heater will decrease until its value becomes the one that corresponds to the flow rate G circulating through the heater fluid, equal to the flow rate R cu15

tiller) 6 ohmic type. Power, ..., - .., ,, -., - ", ....,

consumed by it, it is regulated by the regulating fluid, i.e., until it is restored, 7 which controls the commutation of the ratio G / R 1.

device 8, performed, for example, in the video-When the flow rate increases R (i.e.

de thyristor key. Thermocouples 9 and 10 measure the temperature of the bottom liquid before and after the heater, the flow meter 11 measures the consumption of the bottom liquid taken from the column. The computing device 12 calculates the magnitude G of the flow rate of the fluid circulating through the heater, according to the form: 1e

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) The control system will function in the same way, but the power consumption will be adjusted upwards.

Claims (1)

Invention Formula  K-C- At where P is the power consumed by the heater; K - coefficient of proportionality; C - specific heat product; At is the temperature difference before and after heating () and the ratio G / R, If, then the power. A method for automatically controlling the thermal mode of a distillation column, which includes heating the bottom liquid with an ohmic remote heater, characterized in that, in order to improve the accuracy of regulation and stabilization of the quality of the products obtained, the temperature of the inlet and outlet of the boiler, power, consumed by the boiler, the flow rate of the fluid circulating through the boiler is calculated, it is compared with the flow rate consumed by the heater, the bottom product remains and, if they are unequal, equal to the value corresponding to the flowrate, the power consumed and the composition of the initial mixture are adjusted. When otnosheeshe heater. 0 G / R, the computing device generates a correction signal, appropriately changing the amount of power consumed by the heater and, consequently, the amount of heat supplied to the cube of the column. For example, in the case of a change in the flow rate of the bottom liquid R when the flow rate of the initial mixture is changed. Thus, with a decrease in the flow rate of the initial mixture, the consumption of the bottom liquid is also reduced accordingly. In this case, the ratio G / R will become more units (). From a physical point of view, there will be a decrease in the amount of the mixture to be separated, and consequently, a decrease in the amount required for energy separation. At the time of the change in the flow rate R, when the ratio is fixed by the computing device, it will produce a correction signal for the downstream power control setpoint. The power consumed by the heater will decrease until its value becomes the one that corresponds to the flow rate G circulating through the heater fluid, equal to the flow rate R cu5 ..., - .., ,, -., - ", ...., With an increase in flow rate R (i.e. with ) The control system will function in the same way, but the power consumption will be adjusted upwards. Invention Formula