SU541859A1 - Method for automatic control of a distillation column of a distillation unit with a constant selection of alcohol - Google Patents

Description

(54) METHOD FOR AUTOMATIC COLUMNAL BRAHE GIFT OF THE DISPOSAL The present invention relates to automating the process of screening in alcohol, hydrolysis and other industries. Methods are known for automatic control of a distillation column of a distillation unit, including controlling the flow of alcohol concentration (temperature) on the control plate of the distillation column and stabilizing the distilled alcohol at a given level 1 and 2. However, with such methods, control effects do not take into account in a measure. (expenses of the epyurata and steam) on the technical and economic indicators of the column and, as a result, the possibility of such a combination of these effects, at which the ul shenie these indicators. In case of separate control of steam and epuret consumption, steam consumption is not used to compensate for a decrease in the concentration of alcohol in the epuret, as a result, steam is overrun at a constant selection of alcohol. CONTROL OF THE RECTIFICATION NOY INSTALLATION WITH A CONSTANT SP1-1PT V In order to improve the quality of control of the rectification process and reduce the steam consumption in the proposed method, control the parameter characterizing the concentration of alcohol from the control zone of the rectification column (for example, temperature). exercising; shoWing by simultaneously affecting MOHJioro on the consumption of epuret and steam. In addition, by increasing the loading of the column with alcohol, reduce the consumption of the epyrate and stabilize the consumption of steam at an average level, while using alcohol to reduce the consumption of the column and stabilize the consumption of the epyuraty at an average level. The method is explained in the drawing. The consumption of rectified alcohol is stabilized by a single-circuit system consisting of a flow sensor 1, a regulator 2, a regulating body 3. The flow rate of the epyura is controlled by a bottom loop system consisting of a temperature sensor 4, a regulator 5 and a regulating

6. Disable controller is carried out by the logical block.

Steam flow is regulated by a cascade system consisting of a pressure sensor 8, a regulator 9 and a regulating body 1O, comprising a stabilizing pressure circuit of the column cis, and a regulator 11 and a temperature sensor 4 constituting the system correction circuit. The shutdown of the adjustment controller is performed by logic block 7,

The choice of the mode of operation (without switching or with switching of excitatory influences} is carried out by switch 12.

A method for automatically engraving with a distillation column is as follows: i.

The main noise entering the lower part of the colo: 1X5 (the operation of the reflux condenser and the condenser can be stabilized by HpoBiiHa in any way) is the change in alcohol concentration in the ecurate. This leads to a change in the parameter characterizing the concentration of spirits1 in the control distillation column, in particular the temperature. If the temperature is increased, the flow rate of the eshorate is increased by means of the controller 5, and the steam consumption is reduced with the help of the controller 11, which is based on the controller 9; if the temperature has decreased, then the signs of the stimulating influences are reversed.

This increases the quality of temperature control on the control plate of a distillation column.

In that case, if it is necessary not only to improve the quality of the regulation mode. ON and reduce steam consumption, the method is accomplished by switching control actions. For this, the setting unit of the controller 2 sets the task for the consumption of alcohol, the setting unit of the regulators 5 and 11 sets the task for the concentration of alcohol (temperature, as shown in the drawing) on the control plate, the information about the current and setpoint, w-values Temperatures are input to the controllers 5 to 11 and logic block 7 (via switch 12). In the controller 11, the output signal is adjusted so that, in the off state of its measuring part, the task of lower pressure (correction signal to regulator 9) provides the average steam consumption (corresponding to the specified rectified alcohol consumption and the average of the possible values of alcohol concentration in the eshorate) , in the switched on state

parts - the task for the bottom pressure was within the technological tolerance. The latter is carried out by including in the controller a limiting device in a 1-pass signal.

As the temperature on the control plate of the column increases, logic unit 7 bypasses the measuring part of the regulator 5. Leaving the output stage on, which forms a constant signal to the regulator 6 and sets it to a position at which the flow rate of the echorate is equal to the average value. The regulator 11 with an atom corrects the setting of the regulator 9 as a function of the mismatch between the current and the setpoint temperature and provides a reduction in the steam flow rate up to the pressure value at which the normal operation of the column is maintained.

When the temperature on the control plate decreases, regulator 9 stabilizes the pressure at a given level, since logic block 7 bypasses the measuring part of regulator 11, and regulator 5 reduces the flow rate in proportion to the temperature deviation from the set value.

Claims (1)

1. Author's certificate .N 206494, M.Klyas 12 Pi / 02, dated 1964 2, Copyright certificate №422767, M.Kl.S 12 F 1 / C4, dated 1974