RU1816226C - Method of automatically controlling complex fractionating column - Google Patents

Abstract

The invention relates to methods for automatically controlling complex distillation columns with a single feed evaporation and can be used in the oil refining industry, for example, in primary oil refining plants. The essence of the method: additionally measure the temperature at the outlet and entrance to the column of each stream of sharp and circulating irrigation, calculate the side cuts and the specific consumption of internal irrigation in each section of the column, which are adjusted depending on the selection of side straps from the corresponding sections of the column and the feed temperature of the column is adjusted depending on the specific flow rate of internal irrigation in the upper section of co-; bosoms. 1 ill. j

Description

The invention relates to methods for automatically controlling complex distillation columns with a single feed evaporation and can be used in the oil refining industry, for example, in primary oil refining plants.

The aim of the proposed method is to reduce energy costs and improve the quality of the target products by ensuring the stability of reflux streams in sections of the column.

Theoretical background of the proposed control method.

In order to improve the quality of the rectification target products and reduce the energy costs of the process of separation of the initial mixture, it is necessary, in the author's opinion, to regulate the internal irrigation costs in each section of a complex column taking into account the changes in the column power consumption and the content of distillate fractions in it, as well as to ensure such a fraction of a single evaporation of the food so that a certain predetermined excess flow rate is irrigated from the lower plate of the separation part of the complex column to the lower stripping part of the column and, referred to as excess single evaporation of food. In addition, in order to moderate and evenly distribute the loads along the column height, it is necessary to redistribute heat between all intermediate circulation and acute irrigation.

The relationship between the excess of one-time evaporation of the feed and the heat removal by circulating and acute irrigation is determined from the equation derived from the condition that the sum of the costs of the condensed mixture is equal to the sum of the costs of the side straps and reflux flowing from the bottom plate of the separation part of the column:

MQOO. Sheep GvGvbp

Q

ntso

GNBP

- Swbp snbp (1)

Here LI is the flow rate of reflux flowing from the bottom plate of the separation part of the column, t / h;

Qoo, Sheep, Onzo - heat removed from the column by sharp, upper and lower circulation irrigation, kcal / h, respectively;

bvbp, Onbp consumption, respectively, of the upper and lower side shoulder straps, t / h;

GV, GVBP, GNBP - the heat of vaporization of the head product, upper and lower side straps, kcal / t, respectively, is hidden.

The costs of internal irrigation created by each external column irrigation are determined from the dependencies:

Insider r Goo (1 +

Gw

Gw

L too)

ABOUT

star.vector inner.nzo

vtso

Candle A ti

vtso vtso

vtso

Gubtsonzo GNSS

GVBTs; bNTSO SNTSO AT.NTSSO GNBP

(3)

+ (4).

where GOO..GBHO, bnzo consumption, respectively, of acute, upper and lower circulation irrigation, t / h;

Soo, Svtso, Sntso - heat capacity of the liquid, respectively, acute, upper and lower circulation irrigation, kcal / t;

A too, AT.VCO, Asnzo - the difference between the outlet and entry temperatures of the column, respectively, of acute, upper and lower circulating irrigation, ° С.

In order to take into account changes in the column feed rate, it is convenient to use the value of the excess fraction of a single feed evaporation, expressed as the ratio of the rates of reflux flowing out of the separation LI

the front part of the column, and food,

Gn

Then equation 1 can be written as follows:

And - Qpo i Sheep j Onzo Swbp SNBP

 Gn. 3p

(2)

Gn gv Gn gbbp Gn gbbp Gn (5),

Let us analyze Equation 5 to group its members having the most significant relationship in the process of rectification in a complex column. For example, the specific consumption rate of internal erosion. created for

GNPP van

account of the lower circulating irrigation of the NCO, has a direct relationship with the selection

Ј n lower side shoulder strap, as this

the specific consumption of internal irrigation in the lower section should be as close as possible to the lower side product sampling value. When its value is greater than the sum

selection of the lower side strap D and ZaOP

given value of the excess fraction of one-fold flash evaporation of food - will be

V3n

it is impossible without damaging the quality and selection of the lower side stream, to control the value of the excess fraction of the distillation of a single evaporation of food by changing the fuel supply to the furnace at a predetermined level, i.e. preset settings for regulators

NCO consumption will come into conflict.

un

Based on this, it is advisable to take

25

values

thirty

35

Q

ntsvo

Li gn

close to

GNPP Gn friend or equal.

- -. In the same way, the upper circulating irrigation of the VCO should create in the middle section of the separation part of the column the specific consumption of internal column irrigation corresponding to the selection of the upper side stream. It follows that the nominal condition for the distribution of teller photography between the NTSO and the VTSO is

Onstvo Onbp Intern.nzo GNbp GnGn Gn

(6)

0

5

0

5

A sheep. Swbp Insider Gbbp Gn

(7)

GnGn Substituting the values of the costs of internal irrigation columns 6 and 7 in equation 5 we get

U. Qoo 3p (8)

Gv Gn

It follows that if we use the method of controlling heat removal using circulating irrigation, in which the specific costs of internal reflux created by NCO and VCO are respectively equal to the selection of the lower and upper side straps, then the excess fraction of a single evaporation of food will be equal to the specific the flow rate of internal irrigation created by acute column irrigation. Such a statement of the problem makes it possible to control the ratio of the heat to be heated between acute and circulating irrigation, to regulate a given fraction of a single evaporation of food, and also to regulate the set

internal irrigation flows in the sections of the column, which is aimed at reducing energy costs and improving the quality of the target products.

The proposed automatic control method allows the heat removal by means of column irrigation to be changed depending on the power consumption, since control is carried out depending on parameters such as specific internal irrigation consumption and side runoff selection.

Changes in the content of distillate fractions in the feed are taken into account using analyzers of indicators of the quality of distillate products, which accordingly correct the selection of side cuts and acute column irrigation. In fact, side stream selections are tasks for the regulators of the specific consumption of internal irrigation created by NCO and VCO. Therefore, when changing the selection of side shoulder straps, the regulators change the adjustable value of the specific consumption of internal irrigation in their section of the column. And when the specific flow rate of the internal irrigation of the column created by the sharp irrigation deviates from a predetermined value, the supply temperature at the outlet of the furnace is accordingly adjusted in order to provide a predetermined value of the excess fraction of a single evaporation of the feed.

In the practical implementation of the proposed control method, it is necessary to take into account the possibility of adjusting the set values of the specific costs of internal irrigation depending on the specific operating conditions of the distillation column. For example, there may be a trade-off between the need to increase heat dissipation by acute irrigation to increase the clarity of separation in the column and increase heat dissipation by circulation irrigation to increase the degree of heat recovery. For such corrections to predetermined unit costs of internal irrigation created by the HVAC and the NCO. correction values of AI and D are provided. Then

Slcho

(4 ЦСО СнПП. А

C d to c) rear - 7G ± D1

GNBP Jnbn

(

and

tso

GNPP Gn

Swbp

ass

, oooh

Mr. Yaad. -g-

HFG Un

Gn ± Ai ± Dg

± D

(9) (U) (11)

When using computer technology to manage complex

The distillation column corrects the tasks for the regulators automatically. The AI and willow values are taken as a fraction of the specific consumption of internal 5 irrigation. In this case, it must be borne in mind that + AI and AI + Dg can exceed the value

(TD) ass .. since in this case it becomes

P

impossible share management

0 excessive evaporation of food.

The implementation of the claimed automatic control method is illustrated by an example.

The drawing shows a diagram of the implementation

5 ways.

The process of separation of the initial mixture is carried out in a complex distillation column 1 with heating the feed 2 to a vapor-liquid state in the heating furnace 3 by burning fuel 4. Vapors from the top of the column are condenser-cooler 5, tank 6, from which part of the condensed product comes into the column in the form of acute irrigation, and the other

Part 5 is the head product 8. Rectification products, in addition to the head product 8, are the top 9 and bottom 10 side shoulder straps, as well as bottoms 11, to ensure a more uniform

At a height of the column above the internal irrigation flow, heat is removed from the middle section of the column using the upper circulation irrigation 12, which is cooled in the refrigerator 13, and from the lower section of the column 5, using the lower circulation irrigation 14, which is cooled by the refrigerator 15.

The control of the flow rate to the column 1 is carried out by means of the serially connected flow sensor 16, a regulator 17 and an actuator 18 installed on the power supply line to the furnace 3. The control of the flow of acute irrigation 7 of the column

5 is performed using a flow sensor 19 connected to the first input of the external irrigation flow controller 20 and an actuator 21. A signal from the controller 22 is received at the second input of the controller 20

0 quality indicator of the parent product 8.

The temperature control of the supply 2 at the outlet of the furnace 3 is carried out using an actuator 23 mounted on the fuel supply line 4 in

5, furnace 3, and a temperature controller 24, the first input of which is connected to a temperature sensor 25 and the second input to a controller 26 of an excessive fraction of a single evaporation of power, an alternating signal for which is generated in the unit 27 for calculating the specific flow rate of internal irrigation of the upper section of the column. The first input of unit 27 for calculating the specific consumption of internal irrigation receives a signal from the sensor 19 of the flow rate of acute irrigation 7 of the column, the second - from the sensor 28 of the temperature difference between the vapors coming from the top of the column and the sharp irrigation, and the third - from the sensor 16 of the power supply 2 to the column. The flow control of the upper side stream 9 is provided by the regulator 19, connected with the first input to the flow sensor 30 and the second with the regulator 31 of the quality indicator of the upper side stream, and the output with the actuator 31.

Similarly, the flow control of the lower side strap 10 is performed using the regulator 33, the flow sensor 34, the regulator 35 of the lower side strap quality indicator and the actuator 36. The inputs of the flow controller 33 are connected to the outputs of the flow sensor 34 and the regulator 35 of the lower quality indicator side shoulder strap 10 and the output is with the input of the actuator 36.

The specific internal irrigation and consumption generated by the upper circulating irrigation of the VCO 12 is made in the unit 37 for calculating the internal irrigation of the column due to the VCO, the inputs of which are connected to the outputs of the VCO consumption sensor 38, the 39 temperature difference sensor and the VCO temperature sensor 16, and 2 the output is connected to the first input of the regulator 40 of the specific flow rate of the internal irrigation of the column due to the HVAC, the second input of which is connected to the output of the division unit 41, connected by its inputs to the outputs of the sensors 16 and 30 of the power consumption and the upper side shoulder strap 9. The output of the regulator 40 is connected to the first input of the ECU flow controller 42, to the second input of which the output of the ECU flow sensor 38 is connected. The output of controller 42 is coupled to the input of actuator 43.

The flow control scheme of the bottom 10 circulating irrigation of the NCO includes: a unit 44 for calculating the specific internal irrigation due to the NCO, a sensor 45 of the NCO flow. a sensor 46 for the temperature difference of the NCO, a regulator 47 of the specific flow rate of internal irrigation due to the NCO, a dividing unit 48, a flow controller 49 of the NCO and an actuator 50. The first and second inputs of the unit 44 for calculating the specific internal irrigation due to the NCO are connected to the output of the sensor 45 NCO, the output of the sensor 47 of the temperature difference

NCO, and the third input with the output of the sensor 16 of the power consumption 2, and the output of block 44 is connected to the first input of the controller 47 of the specific consumption of internal irrigation

due to the NCO, the second input of which is connected to the output of the division unit 48, and the output to the first input of the NCO flow controller 49, the second input of which is connected to the second output of the NCO flow sensor 45, and the output

0 regulator 49 flow NCO connected with the input of the actuator 50 installed on the supply line of the lower circulation irrigation 14. The inputs of the block 48 division is connected to the outputs of the sensor 16

5 of the power consumption 2 and the sensor 34 for the consumption of the lower side stream 10.

When implementing the proposed method for the automatic control of a complex column in an industrial environment,

0 serial controls and automation should be used. As sensors 16, 19, 30, 34, 38, 45 of the flow, Sapphire-22 differential pressure gauges complete with DK-40 diaphragms, sensors can be used

5 temperature and temperature difference sensors 28, 39, 46 - transducers 8-78 complete with thermocouples THK-0179, regulators 17, 20, 24, 29, 33, 42, 49 - control stations SURA SURA-2 complete with tori mi RBAM and electro-pneumatic converters EPP, actuators 18, 21, 23, 32, 36, 43, 50 - control valves 25s48nzh. Functions of blocks 27, 37, 44 of the calculation of the internal

5 irrigation, respectively, due to acute, upper and lower circulating irrigation, regulators 26, 40, 47, respectively, of the excess share of a single evaporation of food and internal irrigation due to ECU and NCO, dividing units 41, 48 are implemented using computer technology, for example, UVK SM 1614. As regulators 22, 31, 35 indicators of quality of the head product,

5 upper and lower side shoulder straps can be used automatic analyzers of fractional composition, density meters AIP or temperature sensors.

Automatic control of complex

A distillation column is carried out as follows.

The feed 2 of the column, the passage through the furnace 3, is heated by burning fuel 4 to a certain temperature, which ensures the formation of an appropriate amount of vapor phase, and, therefore, a certain vapor stream entering the separation section of column 1. As a result of vapor condensation by supplying a lower circulating irrigation

NCO creates a flow of internal irrigation of the lower section of the separation part of the column, the specific flow rate of which is determined by the equation:

Svutr.nzo Snzo Snzo DTnzo, at Gn Gn GNPP

where Svnutr.ntso - consumption of internal irrigation created by NCO, t / h;

Gn is the power consumption, t / h (measured by the flow sensor 16);

Sitso - NCO flow rate, t / h (measured by the flow sensor 45).

Snco - heat capacity of the liquid NCO, kcal / t;

A1nzo is the temperature difference between the outlet and entrance to the NCO column, ° C (measured by a temperature difference sensor 46);

GNBP - latent heat of vaporization of the fraction of the lower side stream, kcal / t,

Specific consumption

Swivel.nzo 5l

the column internal irrigation is calculated in the block 44 for calculating the internal irrigation due to the NCO, the signal from which is a variable for the regulator 47 of the flow of internal irrigation due to the NCO. The task for this controller is the output signal from the division unit 48, in which the ratio n is calculated (selection of the lower V3f1

side stream) using signals from the lower side stream and power flow sensors 34, 16. The regulator 47, depending on the change in the selection of the lower side stream by the same amount, changes the specific flow rate of the internal column irrigation by adjusting the task of the NCO flow regulator 49 acting on the actuator 50. The signal from the sensor 45 serves as an alternating signal for the regulator 49 NCO consumption. The specific consumption of internal column irrigation excludes the upper circulation irrigation of the HVCO is calculated in block 37 of calculating the internal irrigation due to the HVCO according to the equation:

b.v.nzo Svtso Svtso Atauo

Gn

Gbbp

(13) 50

where Senutr.vtso - the flow of internal irrigation created by the VTsO, t / h;

Gn is the power consumption, t / h (measured by the flow sensor 16);

Svtso - flow rate in central heating, t / h (measured by flow sensor 38);

S8tso heat capacity of liquid of VCO, kcal / t;

5

10

fifteen

0

5

0

5

0

5

0

5

At,:; io difference t mper round exits and enters the CCW column, ° C (measured by a temperature difference sensor 39);

HCCR - the heat of vaporization of the upper side stream fraction is hidden. kkzl / t.

Measured in block 37, the current value of the specific flow rate of the internal irrigation of the column due to the HVC is supplied as an alternating signal to the controller 40 of the specific flow rate of internal irrigation, the task of which is the signal from the division unit 41, where the ratio is calculated

Ј p (selection of the upper side shoulder strap),:.

The use of signals from the sensors 30.16 flow rate of the upper side stream and power. The controller 40, depending on the change in the selection of the upper side stream by the same amount, changes the specific flow rate of the internal column irrigation by adjusting the task of the ECU flow regulator 42 acting on the actuator 43. The signal from the flow sensor 38 is an alternating signal for the regulator 42 WCO.

The flow rate of the sharp irrigation 7 of the column is controlled by the flow regulator 20, which receives signals from the flow rate sensor 19 of the sharp irrigation and the regulator 22 of the quality indicator of the head product 8. This control circuit provides the desired quality of the head product by changing the flow rate of acute irrigation, which may vary depending on the flow rate and composition of the food. In addition, depending on the temperature difference between the vapors leaving the top of the column and the acute irrigation, the amount of internal irrigation of the column due to acute irrigation will vary. With the proposed method of regulating the specific costs of internal irrigation created by the HVAC and the NCO. depending on the sampling of the upper and lower side runs, the specific flow rate of the internal column irrigation due to acute irrigation will determine the excess fraction of a single evaporation of food, which is calculated in block 27 of calculating the internal irrigation of the column due to acute irrigation (calculation of the excess fraction of a single evaporation of food ) using the equation:

M Sanut.oo Goo Gn

Gn - (

Gn

GB

oo

)

04)

Lt

where p-1- is the excess fraction of a single evaporation of food, t / h;

Li — flow rate of reflux flowing from the separation part of the column, t / h;

Gn is the power consumption, t / h (measured by the flow sensor 16);

Svnutr.oo - consumption of internal column irrigation due to acute irrigation, t / h;

Goo is the column irrigation sharp flow rate, t / h (measured by the flow sensor 19);

Coo heat capacity of acute irrigation fluid, kcal / t;

gv - latent heat of vaporization of the parent product, kcal / t;

Atoo is the temperature difference at the exit of the vapor from the top of the column and the sharp irrigation, ° C (measured by a temperature difference sensor 28).

The controller 26 of the excess fraction of a single evaporation of power supply when the current value of this value calculated in block 27 deviates from the reference selected within the range of 0.03-0.05 adjusts the task of the temperature controller 24, the power supply that controls the actuator 23 by fuel supply lines 4 to the furnace 3.

The quality of the upper side stream 9 is controlled by the regulator 31 of the quality index of the upper side stream, which corrects the task of the flow controller 29, the alternating signal of which comes from the flow sensor 30, and the output signal controls the actuator 32.

A similar control circuit, including a bottom side strap quality control 35, a flow controller 33, a flow sensor 34 and an actuator 36, is used to control the quality of the bottom side strap 10.

The proposed automatic control method makes it possible to ensure at a given level the quality of the target distillate products, the distribution of heat removal between VCO, NCO and acute irrigation, the specific consumption of internal column irrigation and the excess fraction of a single evaporation of food under conditions of variable flow rate and composition of the food.

These are the main indicators of the operation mode of a complex distillation column, due to the control of which it is possible to reduce energy costs and improve the quality of target products.

A numerical example of the implementation of the method.

The proposed method will be used to control the atmospheric column of the multi-tonnage installation ELOU-AVT-bM. The oil separation products in this column are: the overhead product is gasoline, the upper side product is kerosene, the lower side product is diesel (summer), the bottom residue is fuel oil.

The operation mode of the column is characterized by the following averaged indicators:

power consumption, Gn 1000 t / h,

kerosene consumption, t / h,

diesel fuel consumption, bnbp 270 t / h;

temperature difference of acute irrigation, L too 45 ° C;

the difference in temperature of the ECU, AgVto 80 ° C;

temperature difference NCO, AtH4o 140 ° C;

heat capacity of gasoline,, 6 kcal / t;

kerosene heat capacity,, 0 kcal / t;

heat capacity of diesel fuel,, 0 kcal / t;

latent heat of vaporization of gasoline, gv 71432 kcal / t;

latent heat of vaporization of kerosene, GWBP 57,240 kcal / t;

latent heat of vaporization of diesel fuel (summer). GNPP 41310 kcal / t

Using the available indicators of the operating mode of the industrial column and recommended in this application

equations 6 and 7 nominal values

unit costs of internal irrigation

sections of the column, we calculate the tasks for

regulators of 40 and 47 unit costs

internal irrigation created for

account of the VTsO and NTSO.

from the Interior. all hours of SVBP 180 p 1Y ms (r ad. - - 7mrrUl1b Ub) ..

Cn

Gn 1000

(

G

 domestic NGO at SNBP 270 pp (1sl

cn hell; -GT Tooo 0 27tlb)

Given the initial data on the specific heat, latent heat of vaporization, and the temperature difference of the circulation irrigation, we determine using the equations 3, 4, 15, 16 the costs of the HVO and the NCO, the regulation of which is ensured by the regulators 42 and 49 of the VCO and the NCO, respectively

 bbbp gbbp gn

Gn 0.18 Ј VonU-251.05 t / h (17)

GBUO

Candle Ateuo 57 240 1000

513,080

5

Stzz 0.27

 SNBP Hzbp Gn

GnSnzo ATnzo

413101000

525.0140 151 75T / H 18 Internal column irrigation flow, providing irrigation of the plates and the upper section of the column and the magnitude of the flow of Li reflux draining from the separation part

columns are provided by acute irrigation. Excess share

single evaporation of food

raes, based on recommendations (2, p. 15x3), within 0.02-0.05. Accepted for calculations, its average value is 0.04. we find from equations 8 and 2 the nominal values of the specific flow rate of the internal irrigation of the column, created by acute irrigation, and the consumption of acute irrigation for the proposed specific operating conditions of the industrial column

(nineteen)

0.04 x

(twenty)

are stored according to equations 15 and 16 at the same level and will be respectively 0.18 and 0.27. However, the actual current values of the unit costs of domestic.

bn

them irrigation

will be less than a predetermined value, because there was an increase in Sp. As a result of comparing the set and current values of the specific flow rate of internal irrigation, the regulators 40 and 47 will work out correction signals to the regulators 42 and 49 to increase the costs of the HVO and the NCO, ensuring that the set specific flow rates of the internal irrigation are stored in the column. With an increase in the flow rate of the column, the initial portion of the distillation of the feed will be insufficient, the current value of the specific flow rate of internal irrigation

banutera.oo

Gn

- created due to acute oro

41432

These values are the settings, respectively, for the regulator 26 of the excessive fraction of a single evaporation of power and the controller a 20 for the flow of acute column irrigation.

Consider the operation of the automatic column control system under the following disturbances to the rectification process: a) increase in power consumption;

b) an increase in the content of fractions of the lower side stream in the feed;

c) an increase in the content of fractions of the head product in the diet. .;

a) When increasing the power consumption of the column, for example, from 1000 to 1100 t / h is required to maintain the value of excess

U - fraction of a single evaporation of food - in

"P

In Equation 5, in proportion to the change in the power consumption, increase the values of Q0o, Q-echo, 0-nco, GB6n, SNBP. This task is implemented as follows. At the first moment, with an increase in the power consumption, the fractional compositions of the side straps will be alleviated, since their under-selection will lead to an increase in the consumption of reflux flowing into the cube of the column. At the same time, the regulators 31 and 35 of the quality indicators of the upper and lower side shoulder straps will increase the tasks for the controllers 29 and 33 to increase the flow rate of the upper and lower side shoulder straps, respectively.

Since the costs of side shoulder straps and column feeds are proportional, the selection of side shoulder straps and the task for the regulators 40 and 47 of the specific flow rate of internal irrigation due to HVO and NCO.

thirty

25

35

ABOUT

fifty

5

At the same time, it will be less than the set value and the regulator 26 of the excessive fraction of once evaporation of food will increase the task of the controller 24 of the supply temperature at the outlet of the furnace. At the same time, the regulator 22 of the quality index of the overhead product increases the flow rate of acute irrigation, and the temperature controller 24 responds to initial changes in the supply temperature. Correction of the feed temperature of the column will be carried out until the current value of the excess fraction of a single evaporation of the feed reaches a predetermined value of 0.04.

b) With an increase in the content of the lower side product fraction in the food, it is necessary to increase the heating of the food in order to ensure that the entire distillate fraction taken in the form of side products is converted to the vapor phase. Initially, with this change in the composition of the food, the low boiling components on the plate will decrease with the output of the lower side stream and, with the available flow rate of the internal irrigation of the column, the content of low boiling components in the overhead product will also decrease. The regulator 22 of the quality index of the head product, while maintaining the desired composition of the head product, will reduce the task of the regulator 20 of the consumption of acute irrigation. In this case, the current value of the excess fraction of a single evaporation of food -% Ґ- will

Gv op

is less than a predetermined value and the controller 26 of the excessive fraction of a single evaporation of the power supply will increase the correction signal to the temperature control unit 24. At the same time, the regulator 35 quality indicators

the lower side stream will increase the task of the regulator 33 of the flow rate of the lower side stream, and the controller 47 of the specific consumption of internal irrigation will increase the flow of NCO, because the reference equal to J- will increase for this controller.

"P

c) With an increase in the content of the column fractions in the feed of the column, an increase in the specific fraction of a single evaporation of the feed is also required. Initially, when the composition of the food is changed for the given flow rates of column irrigation and side straps, the compositions will mix down the column. In this case, the regulator 22, the quality indicator of the overhead product to maintain the desired composition will reduce the task of the regulator 20 of the consumption of acute irrigation, which will cause a decrease in the excess share of a single evaporation of food

. Regulator 26 of the excess share of one

multiple evaporation of food, comparing the current value of-7 - with a given value

Bp

will change the correction signal to the temperature controller 24 upwards, thereby increasing the fuel supply to the furnace. .The regulators 40 and 47 of the specific flow rate of the internal irrigation of the column due to the VCO and NCO their correction signals are not from the Editor V. Truochenko

Compiled by J. Chervonna

Tehred M. Morgenthal Corrector G., Kos

Order 1646Mintage Subscription

VNIIIPI of the State Committee for Inventions and Discoveries under the USSR SCST 113035, Moscow. Zh-35, Rauska embankment. 4/5

0

5

0

5

0

ment because the selection of the upper and lower side shoulder straps has not changed.

Claims (1)

With an increase in the content of the column feed fraction of the upper side stream, the automatic control system of the column works as in case b. SUMMARY OF THE INVENTION A method for automatically controlling a complex distillation column by adjusting the flow rate of intermediate circulation irrigation, the flow rate of acute irrigation and side straps depending on the quality parameters of the head product and side shoulder straps, as well as the heat supply to the column depending on the supply temperature, characterized in that in order to reduce energy costs and improve the quality of the target products by stabilizing the reflux streams in the sections of the column, the temperature is measured at At the entrance to the column of each flow of sharp and circulating irrigation, side withdrawals and specific internal irrigation costs in each section of the column are calculated, which are adjusted depending on the selection of side straps from the corresponding sections of the column, and the column supply temperature is adjusted depending on specific flow rate of internal irrigation in the upper section of the column.