SU983670A1 - Device for automatic controlling of preparation and feed of hydrocarbon charge for diene hydrocarbon polymerization and comparison unit - Google Patents

Description

laziness process. This is due to the fact that it performs only one function to automate the process of preparing and feeding the charge, i.e. It takes into account one situation - limiting the productivity of the technological process, while in a real technological process of polymerization of diene monomers, apart from this, there are situations of limiting the supply of monomer and limitations imposed by the processes of polymer isolation. The purpose of the invention is to improve the quality of process control. This goal is achieved by the fact that the automatic control device for the preparation and supply of hydrocarbon mixture for the polymerization of diene hydrocarbons, containing a monomer flow controller, whose input and output are connected respectively to a monomer flow meter and a control valve on the monomer feed pipe, controls the monomer concentration The charge, the input of which is connected to the sensor of the monomer concentration in the charge, the flow controller of the return solvent, the input and output of which are connected accordingly a solvent return flow meter and a control valve on the return solvent supply pipeline, and a control valve on the charge supply pipeline are equipped with an additional monomer concentration controller in the charge, the inlet of which is connected to the monomer concentration sensor in the charge, and the black outlet of the first switch is connected to the control input of the return flow dissolving torus, the monomer flow control unit, the output of which through the second key is connected to the monomer flow controller, the return solvent flow setting unit, output The third key is connected to the return solvent flow controller, a level sensor in the charge collector, two level controllers in the charge collection and a control valve on the charge supply line, and the level regulator inputs are connected to the level sensor in the collection The charge, and the output of one level regulator in the charge collector is connected via the fourth key to the input of the return flow controller, and the other through the fifth key with a regulating valve. On the pipeline of the charge, ur and sensor the output of the level controller in the polymer collector is connected to the level sensor in the polymer collector collector, and the output through the sixth key is connected to the control valve on the charge supply pipeline, the first element OR, the output of which is connected to the control The seventh key inlet that connects the output of the main monomer concentration regulator in the charge to the input of the monomer consumption regulator in the charge, the second OR element, the output of which is connected to the control input of the fifth key, the comparator unit, the first input of which is connected to the level sensor in the polymer collector, the second input, with the level indicator in the polymer collection, the third input - with the output of the main monomer concentration regulator in the charge, the fourth input - with the input of the monomer consumption controller, the fifth input is with the output of an additional monomer concentration controller in the charge, the sixth input is with the input of the return solvent flow setting unit, and the first output is connected to the control inputs of the fourth and sixth keys, as well as the first input of the first About the OR element, the second output with the control input of the third key and the second inputs of the OR element, the third output with the control inputs of the first and second keys and the first input of the second OR element. Also known is a comparator unit containing four elements of comparison and four triggers, in which the output of each element of the comparison is connected to the input of the corresponding trigger 31. The disadvantage of this unit is that it produces independent control signals, which limits the scope of application of this unit in the control systems of technological processes. The purpose of the invention is to expand the control functions of the automatic process control device. To achieve this, a comparison unit containing four comparison elements and four flip-flops, the output of each comparison element connected to the input of the corresponding trigger, is equipped with three keys, the first and second inputs of the first comparison element being the first and second comparison unit inputs, direct the output of the first flip-flop is the first output of the comparator unit and is connected to the inverse output of the fourth flip-flop, the direct output of which is the second output of the comparator unit and connected to the direct output the house of the third trigger; the inverse output of the first trigger is connected to the control input of the first key, the input of which is the third input of the comparison unit. and the output is connected to the first input of the second comparison element, the second input of which is the fourth input of the comparison unit, the direct and inverse outputs of the second flip-flop are connected respectively to the control inputs of the second and third keys, the inputs of which are connected and the fifth input comparator, and the outputs are connected respectively with the first inputs of the third and fourth comparison elements, the second inputs of which are connected and are the sixth input of the comparison unit, while the inverse output of the third trigger is the third output block comparison. The comparator unit can also be used, for example, for the device for automatic control of the polymerization process of diene monomers, since in this technological process various production situations arise associated with limiting the supply of components to the polymerization, in particular, catalyst components, the charge, as well as with a limitation associated with the process of isolating the finished product. FIG. Figure 1 shows a functional diagram of an automatic control device for the preparation and supply of hydrocarbon hygiene for the polymerization of diene monomers} in Fig. 2, a diagram of the comparison unit. The device automatically controls the process of preparing and supplying the hydrocarbon mixture for the polymerization of diene monomers contains keys 1–7, the OR 8 element, the monomer flow rate setting device 9, the monomer concentration sensor 10 in the charge, the monomer concentration control unit 11 in the charge, the monomer consumption regulator 12 flow meter 13 monomers, control valve 14 on the pipeline 15 through; tsachi monomer, collection 16 charge, flow meter 17 return solvent, control valve 18 on the pipeline 19 supplying the return solvent, regulator 20 races A return solvent solvent, an additional monomer concentration controller 21 in the process, a solvent return flow controller 22, a 23 level regulator in the charge collector, a 24 level sensor in the charge collector, a 25 level regulator in the charge collector, a control valve 26 on the pipeline 27 charge supply, an OR 28 element, a level controller 29 in the polymerizer collector 30, a level sensor 31 in the polymer collector 30, a level setter 32 in the polymerization container 30, and a comparator block 33 The comparator unit contains keys 3436, comparison elements 37-40, triggers 41 -44. The input and output of the flow regulator monomer 12 is connected respectively to the monomer flow meter 13 and the control valve 14 installed in the monomer feed pipe 15, the outputs of the first and second monomer regulators 11 and 21 in the mixture are connected to the monomer concentration sensor 10 in the charge, the input and the output of the return flow controller 20 is connected respectively to the flow meter 17 of the return solvent and the control valve 18 on the return flow line 19 of the return solvent; the output of the second regulator 21 is concentrated monomer in the charge through the first key 1 is connected to the input of the flow controller 20 of the return solvent, the output of the setting device 9 monomer flow through the second key 2 is connected to the monomer flow regulator 12, the output of the setting unit 22 of the return solvent through the third key 3 is connected to the input of the regulator of the return solvent consumption torus 20, the level sensor 24 in the charge collector is connected to the inputs of the first and second controllers 23 and 25 Ghfs in the charge collection, the outputs of which are connected respectively via the fourth switch 4 to the input of the controller 20 the return solvent and the fifth key 5 with the regulating valve 26 on the feed supply line 27, the sensor 31 of the level of the polymer collector at the output of the polymerisation battery through the level regulator 29 in the polymer collector and the sixth switch 6 is connected to the control valve 26 of the supply line 27 The charge, the output of the first element OR 8 is connected to the input of the seventh key 7, connecting the output of the first regulator 11 of the monomer concentration in the charge to the input of the regulator 12 of the monomer flow in the charge, the output of the second element OR 28 is connected to the first input of the comparator unit 33 is connected to the level sensor 31 in the polymer collector, the second input of the comparator unit 33 is connected to the level generator 32 in the polymer collector 30, the third input with the output of the first monomer concentration controller 11, fourth. input - with input, monomer consumption setting device 9, input with the output of the second monomer concentration controller 21 in the charge, the sixth input - with the input of the setting device 22 of the return solvent, the first output of the comparison unit 33 is connected to the control inputs of the fourth 4 and the sixth 6 keys and the first input of the first element OR 8, the second output with the control input of the third 3 key and the second inputs of the first 8 and second 28

the OR elements, the third input - with the control inputs of the first 1 and second 2 keys and the first input of the second element OR 28,

The first and grieve input of the first comparison element 37 are the first-i and the second inputs of block 33 and are connected respectively to the output of the level sensor 21 in the polymer collector and the output of the level indicator 32 in the collector, polymerizate, the first outputs of the four elements 37- 40 comparisons are connected respectively to the outputs of the four flip-flops 41-44, the direct input of the first flip-flop 41 is the primary output of the comparator and is connected to the control inputs of the fourth and sixth keys 4 and b, the first input of the first element OR 8 and the inverted output The fourth trigger 4 4, the direct output of which is the second output of the block, is compared and connected to the control input of the third key - the second inputs of the first 8 and second 28 OR elements, and the direct output of the third TRKGER 43, the inverse output of the first trigger 41 connected to control A key input. 34, whose input is the Third input of the comparison unit and connected to the output of the first monomer concentration controller 11 in the charge, and the output connected to the first input of the second comparison element 38, the second input of which is the fourth input of the comparison unit and connected to the input of the setting device 9 of the monomer consumption, the direct and inverse codes of the second tr1-: gage 42 oediizny respectively control; - the inputs of the keys 35 and 36, whose inputs are connected and are the fifth input of the unit of comparison, which is connected to the output of the second regulator The mouth of the 21 monomer ends / strains in the charge, and the codes of keys 35 and 36 connect, respectively, with the first t and the inputs of the third 39 and fourth 40 elements of the middle. The second inputs of which are connected and are the sixth input of the comparison unit which is given to the input of the unit 22 - return solvent solvent consumption, the inverse output of the third flip-flop 43 is the output of the comparison unit and connected to the inputs of the first 1 and second 2 keys and the input of the second element OR 28.

The main element of the automatic control device is the comparison unit, which is level in the polymerizate collection, as well as the current and nominal consumption of the monomer and return solvent to the specified consumption of the same products, generates signals that include one or another part of the process control system and

FIR feeds depending on which of the factors (limitations on the monomer feed process and return solvent; restrictions, on the .f.bie process of polymerization processing) limits production.

The switching condition is that the control action reaches the limit value. To ensure. the stability of the operation of the comparison unit, the switching conditions carried out by the comparison elements of this block have vnd;

G JXdi7G3,

where t3i

nominal value of stroke HI

Jxd-fc

integral component of the current control system /

G., - specified limit value of the flow.

The device works as follows.

Piping 15 and 19 in the collection of the charge 16 serves the monomer and return solvent, the flow of monomer registers the flow meter 13 of the monomer, and the flow of returnable solvent flow meter 17 of the return pc1 solvent. Next, the mixture from the collection of the charge 16 through the pipeline 26 supply of the mixture serves PA polymerization. A level sensor 31 measures the level of polymerizate in polymerizate collector 30 at the exit of the polymerization battery. Data on this level is fed to the first input of the comparator block 33, i.e. To the first input of the comparison element 37, to the second input of which the value of the permissible level of polymerization is supplied from the setter 32 levels in the polymerization collector, Irie exceeding the level of 1% of the merizat of the specified value; This signal causes the closure of key 4 through the element OR 8 - key 7 and through the element OR 28 - key 5. At the same time, the process of preparation and supply of the charge is controlled, provided that the extraction process is limited. A further incorporated limerizata and control system.

The monomer D concentration of the charge from the sensor 10 of the MOEiepam concentration in the charge enters the monomer concentration adjusted to the 11 in the charge. The control action produced by this regulator goes through the switch 7 to the monomer consumption regulator 12. There also receives data on the consumption of monomer from the flow meter 13 monomer. The regulator 12 changes the monomer decoding through the control valve 14 on the monomer feed pipe 15,

The level in the collection of 16 charge regulate the change in the flow rate of the return solvent. The value.level in the charge collection 16, taken from the level 24 sensor in the charge collection, goes to the level 23 controller in the charge collection. The control action from the regulator .23 through the key 4 is fed to the input of the regulator 20 races, the return solvent stroke, where data on the consumption of the returnable solvent are also supplied from the flowmeter 17 of the returnable solvent. The control action from the return solvent flow regulator 20 is transferred to the control valve 18 of the solvent return pipe 19.

The level in the collection of 30 polymerizate regulate the change in consumption of the charge. For this, it is measured by a level sensor 31 in a polimerized collector. The level controller 29 in the polymerization collector, in accordance with the measured values, generates a control action which, via key b, enters the control valve 26 in the feed supply line 27. If the level r of the polymerizate collection does not exceed the permissible value, then on the inverse output of the trigger 41 a resolution signal is produced, which via the key 34 to the first input of the comparison element; 38, the controlling influence of the concentration regulator 11 is taken from the output of its integrator, namely

. G.yxdt,

where G, ..- nominal value

. yes monomer.

At the second input of the element 38 comparison receives the specified limit value of the flow rate of the monomer GM-J is a comparison of successive signals

mn

Xd-fc G,

provided

mg

At the direct output of the trigger 42, a signal is generated that opens the key 35. The first input of the comparison element 39 is the controlling action of the monomer concentration controller 21 in the charge, taken from the output of its integrator, namely C5pm +

fl

(where Q ph is the nominal value of xat

solvent reflux consumption).

At the second input of the element 39 comparison receives the specified limit

the return flow rate value of the rasp. Qp and provided

about yGp-b nz direct output trigger 43

A switching signal is generated to the process control system and to supply the charge for the case of limiting the return flow rate. solvent.

Q This signal, received at the control input of keys 3 and 7 (through the element vmvi 8) and 5 (through the element OR 28), includes the following control system.

5 The monomer concentration in the charge is controlled by changing the monomer consumption, ka, k, and in the previous case. The level in the scheduling accumulator 16 is adjusted by changing the charge flow rate: depending, 5: on the level sensor 24 reading in the charge collector level regulator 25: in the charge collector, it generates a control action through the key 5 to the control valve 26 ka pipeline 27

feeding the charge, change the flow of the charge. Regulation of the flow of the return solvent oschtsezl gat from the setter 22 of the flow rate of the return solvent, the task from which through

the key 4 is fed to the return solvent flow regulator 20, which WU 1 calls the regulating effect on the control valve 18 on the return solvent supply line 19. Qpn + provided

t -. - -.

 - right out trigo

Hera 43 will be O and the keys 3, 5 and 7 will open, and on the inverse output

trigger 43 will be

which: cash

ry serves the control inputs of keys 1 and 2 and through the element OR 28 to the control input of key 5. This turns on the control system

the process is ready ;; p and the supply of the charge for the case is limited: the consumption of monomer.

In this case, the monomer concentration in the charge is adjusted by changing the flow rate of the return solvent. The signal from the monomer concentration sensor 10 in the charge is fed to the monomer concentration regulator 21 in the charge, the control action from which

through the key 1, the footswitch is placed on the controller 20 of the return solvent consumption. There also receives data on the return flow rate. From the flowmeter 17 of the return solvent, the control action from the controller 20 is supplied to the control valve 18 in the return solvent supply line. The level in the collection of 16 charge regulate the flow change

Claims (3)

charge, as in the previous case. Monomer consumption control is effected from eadanchik 9 monomer breakdown, the task of which through CLKT 2 is fed to monomer consumption regulator 12. The regulator 12 generates a control action on the control valve 14 in the MOHQMepa feed line 15. Under the condition of G. Q .... jXd-t Q T, °. at the output of the comparison element 38 will be O, and therefore, at the inverse output of the trigger is 1. This signal arrives at the control input of the key 36 and closes it / passes to the first input of the comparison element 40 a control action from the output of the monomer concentration regulator 21 charge. The second input of the comparison element 40 receives the specified value of the return solvent consumption and, if Gp Jjtat V 7 G p, the output of the comparison element 40 will be /, Therefore, the direct output. Trigger 44 will have a signal that includes the process control system preparing and supplying the charge for the case of limiting the consumption of the return solvent. H Under the condition of a bn5b or5, the inverse output of the flip-flop 44 will have a signal that includes a system for regulating the process of preparing and feeding the charge, provided that the polymerisation process is limited. Thus, the proposed device allows to improve the quality of process control by expanding the function of the control system of the process of preparing and supplying the charge for polymerizing diene monomers, controlling the process not in one but in three possible situations of limiting the productivity arising during the process of preparation and feed charge; by limiting the supply of monomer, by limiting the supply of returnable solvent and by limiting the polymerisation process. The proposed device fully performs the functions of an operator, which includes a specific control system depending on the production situation. Claim 1. Automatic control device for the preparation and supply of hydrocarbon charge for the polymerization of diene hydrocarbons, containing a monomer flow controller, the inlet and outlet of which are connected respectively to the monomer flow meter and control valve on the monomer feed line, the monomer concentration controller in the charge, the inlet which is connected to the monomer concentration sensor in the charge, the flow controller of the return solvent,. the inlet and outlet of which are connected respectively by a flowmeter of a returnable solvent and a control valve on the sub-supply line of the return solvent, and a control valve on the supply line of the charge, characterized in that, in order to improve the quality of process control, it is equipped with an additional concentration control monomer in the charge , the input of which is connected to the monomer concentration sensor in the charge, and the output through the first key is connected to the input of the return flow controller of the solvent, the flow meter indicator the number, the output of which through the second key is connected to the monomer flow controller, the unit for returning solvent consumption, the output of which through the third key is connected to the flow controller of the return solvent, the level sensor in the charge collector, two level controls in the collection and the regulating valve on the pipeline supply of charge, with the inputs of level regulators connected to the level sensor in the charge collector, and the output of one level regulator in the collection of charge through the fourth key connected to the input of the regulator of the legs solvent and other -through a fifth key with a control valve on the feed line of the charge, the sensor and regulator level in. the polymerization collection at the output of the polymerization battery; the input of the level regulator in the collection of polymerization is connected to the level sensor in the collection of polymerization, and the output through the sixth key with the control valve on. the feed line of the charge, the first OR element, whose output is connected to the control input of the seventh key connecting the output of the main monomer concentration controller in the charge to the input of the monomer consumption regulator in the charge, the second OR element whose output is connected to the control input the fifth key, the comparison unit, the first input of which is connected to the level sensor in the polymer collector, the second input - to the level indicator in the polymer collection container, the third input to the output of the main monomer concentration controller in the charge, four the third input is with the input of the monomer flow rate adjuster, the fifth input is with the output of an additional monomer concentration regulator in the charge, the sixth input is with the input of the return solvent flow rate setter, and the first output is connected to the control inputs of the fourth and sixth keys, as well as the first input the first OR element, the second output with the control, the input of the third key and the second inputs of the OR elements, the third output with the control inputs of the first and second keys and the first input of the second OR element. 2. A comparator unit containing four elements of comparison and four triggers in which the output of each element of the comparison is connected to the input of the corresponding trigger, characterized in that, in order to expand the control functions of the automatic process control device, it is equipped with the first and second inputs of the first comparison element are with the first and second inputs of the comparison block, respectively; the forward output of the first trigger is the first output of the comparison block and is connected to the inverse of the output The house of the fourth flip-flop, the direct output of which is the second output of the comparator unit and connected to the direct output of the third one, is inverse, the output of the first flip-flop is connected to the control input of the first key, the input of which is the third input of the comparator unit, and the output is connected With the first input of the second comparison element, the second input of the KOTopoto is the fourth input of the comparison unit, the forward and inverse outputs of the second flip-flop are connected respectively to the control inputs of the second and third keys, the inputs of the COYLUS are connected and are the fifth comparator input, and the outputs are respectively connected to first inputs of third and fourth comparator elements, the second inputs of which are connected and are sixth input comparator block, the inverse output of the third flip-flop is the output of the third comparing unit. Sources of information taken into account in the examination of 1 .. Campbell D. P. The dynamics of chemical technology processes .. M., Goskhimizdat, 1962, p. 310 2.Varlamov M.L., Podvalniy S.L. and Polkov A.V. Pneumatic ACS by a polymerization process in production. SKIS. Collection of pneumatic automation, M., Science, 1974, p. 58-61 (prototype). 3. Gorelik A. L. and others. On-board digital computers. M., Mechanical Engineering, 1975, p. 3 (prototype). /