SU1529183A1 - Pneumoelectronic system for central monitoring and control - Google Patents

Abstract

The invention relates to pneumoelectronic systems of centralized monitoring and control. The aim of the invention is to improve the accuracy of the system while controlling the flow ratios. The difference of the system from the prototype, which ensures the achievement of the goal, is that for each unit 1 of the technological process a block of 7 variable ratio factors is added, which makes it possible to correct the ratio coefficient of the flow regulators. 2 Il.

Description

one

(21) 4296009 / 24-24

(22) 13.03.37

(46) 12/15/39. Bul No. 46

(71) Institute for Control Problems, Moscow Plant of Precise Measuring Instruments and the State Research Institute for Industrial and Sanitary Gas Cleaning (SU) and Lutomatiouto mine by A. Hakala KU (FI)

(72) A.P.Shubin, T.K.Efremova,

A.A.Tagayevsk, Z.I.Belov, E.O.Barsky, V.E. Erdman, P.I. Dudkin (SU) and Antti Khakala (FI) (53) 621.525 (083.3) (56) Av. the USSR certificate of the USSR No. 1043589, Yu1. G 05 3 11/60, 1933.

USSR Author's Certificate No. 1363135, cl. G 05 V 15/00, cl. G 05 B 11/53, 01.07.86.

E | Remova TK, Tagayevsk A.A., Shubin A.N. Pneumatic complexes of technical means of automation.- M .: Mashinostroenie, 1937, p. 280, p. 18.

(54) A CENTRAL-LEVEL CUPTROL CENTER AND MANAGEMENT SYSTEM (57) The invention relates to pneumo-electronic systems of centralized monitoring and control. The aim of the invention is to improve the accuracy of the system while controlling the flow ratios. The difference of the system from the prototype, which ensures the achievement of the set goal, is that for each process unit 1 a block of 7 variable coefficients and ratio factors is added, allowing to correct the ratio for the flow controllers. 2 Il.

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The invention relates to pneumo-electronic systems of centralized monitoring and control for the automation of continuous technological processes, including the processes of thermal combustion of chemicals and gas fuels in chemistry, petrochemistry, oil refining and other industries,

The aim of the invention is to improve the accuracy of the system.

FIG. 1 shows a block diagram of a pneumoelectronic system of centralized monitoring and control; FIG. 2 is a block diagram of a pneumatic block of variable cost ratio;

The pneumoelectronic system, centralized monitoring and control (FIG. 1) contains n technological process units of the same type 1, analog sensors 2 ,,,,., 2, actuators 3 ,,,,, 3, control and display unit 4, regulators 5 , ,,,, 5 expenses, blocks 6; ,,,, 6, 6 variable coefficients of the ratio of expenses, blocks 7 4 ,,,,, 7 group nominal adjusters, control computer 3,, two blocks 9 and 10 analog-digital converters and remote control setting device 11.

The outputs of sensors 2 ,,,,, 2 are connected to the first group of 12. information inputs of the control and display unit 4, through the first block 9 of analog digital converters to the first 13 ,,,., 13p group of input measuring channels of the control computer 8, to channels 14 ,,, .., 14 “variable regulators 5 ,,, .., 5 flow rates and channels 15; ,,,, 15 blocks 6; ,,,, 6 6 variable coefficients of the ratio of expenses. The inputs of the actuators 3

yen with the first group of 16 output information channels of the control and display unit 4, with the use of 1 17, ,,,, 1 controllers 5, ,,,, 15, "flow and through the second input information channel 13 of the control and display unit 4 with the setting unit 11 remote control. The second group of 19 output information channels of the control and display unit 4 is connected to the shut-off inputs of the flow rate controllers 5.5, the first control inputs 20 ;, ,,.,, Blocks 7 ,, ... 7, in the group setting controllers soy

l

n 5 Q

. .

five

0

five

with the third group, 21 information outputs of the control and display unit 4, and the second control units

inputs 22122 - With channels 23 ,,,,,

,,,, 23 outputs of discrete information of the control computer 8, the information channel 24 of which is connected to the fourth information output 25 of the control and display unit 4. The outputs 254 of the power unit 7 of the group nominal sensors are connected to the channels 26 of the nominal inputs of the flow controllers 54, with the channels 27 ,, ,,, 27 the nominal inputs of the blocks 6; I, i6n, variable cost ratios, with the third group of 28 information inputs of the control and display unit 4 and through the unit 10 analog-digital converters with the second group of 29 input measuring channels of the control computer 8, Outputs 30 ,,,,, 30 blocks 6; ,,,,, 6 variable cost ratios are connected to inputs 26; ,,,, 26 nominal values of the corresponding regulators 5 - ,,,, 5

expenses

I

The block 6 of variable flow ratio factors (FIG. 2) is designed for y of a parameter received at its input Pg (channel 15) from sensor 2j, for a correction factor K uniquely determined by the signal level at its control input Pupp (channel 27) coming from the output of block 7 of the group setting devices nominal. The signal from the output of the OPEN unit (channel 30) is fed to the input of the No.1 on the flow controller 5. Unit 6 contains a throttle adder 31, a reference element 32, an output power amplifier 33, a throttle adder 34, a single-membrane element 35, a constant choke 36, and a reference pressure setting device 37. In accordance with the block diagram, the variable coefficients block 6 implements the operation P,, K (Pg, –P) + OPD op a reference pressure of 0.2 kgf / cm, the lower level of the input and output pneumatic signals (generated by the setting unit 37) . K is a variable coefficient that is uniquely dependent on the level of the control signal: K (P, pp),

On the example of the implementation of the method of controlling the process of sulfur

five

from sulfur-containing gases, according to the system operation.

The monitoring and control system optimizes the sulfur production process at three levels.

At the first level, the control computer 8 provides for the correction of the cost ratio using the block 6 variable coefficients depending on the change of parameters (temperature, pressure) in accordance with the expression

. u11AOZSh "12731 about oiell (P +1.033) ()

de G s / yo-y:,;

W - 1Г о о IWK-L t Т and О IJ T

I

wholesale

adaptation factor;

It happens as follows.

15

С-г - concentration of combustible

ponenta in gas, vol.%; expenditure coefficients of tapering devices for the consumption of fuel gas and air; 25

IТр - temperature of fuel gas and air, ° G;

ir .. - fuel gas pressure and

 1 air, kgf / cm.

thirty

The control computer 8, using the signals from sensor 2 of unit 1, calculates the necessary A), i.e., the flow ratio, determines the actual ratio, and, depending on the error sign, outputs control signals to the unit drivers, depending on the error sign. 7 face values, at the output of which control signals are generated, arriving at the control input of the variable coefficient block 6 (channel 27 in FIG. 2), the output signal of the variable coefficient block 6 is fed to the input nominal inal regulators 5 costs. Since the input of the parameter of the regulators 5 receives the signals of the actual values of the flow from the sensors 2, the regulators 5, acting through the control and monitoring unit 4 on the actuators 3, change the actual expenses, ensuring that they are equal to the set values. ratios of process flows.

At the second level, the control computer 8 is on signals from

0

336

Analog sensors 2, fed through the analog-to-digital converters block 9, determine the quasi-optimal value of the adaptation coefficient of the condition that the recovered and oxidizing phases of the gaseous components in the exhaust gases of the thermal unit are equal to zero.

S

Ce.f .ch

ABOUT,

where R is the chemical interaction coefficient of the oxidative and reducing phases;

Wed .. and

CQ.Q, - measured by sensors 2 concentrations of the reducing and oxidative phases, vol.%. The control computer 8 determines the value of jf based on the expression

at 100 ll / Ci O 42 + 0.795

At the third level, the norm is the search for the optimal value of the adaptation coefficient, which ensures the maximum value of the degree of conversion of chemical reagents and gaseous fuels. The computer control 8 calculates the degree of conversion by the expression

J C e cL ± Co, T, QB.

 (

P

 , Ci.j. ± Co, f 100

ABOUT

and

l with q

five

where Cg and Co. (p, are the ends of the reductive and oxidizing phases of the components in the exhaust gases; QT and Pe are the fuel consumption

gas and air

corrects the value of Rg, and therefore, so that the degree of the coy-version is maximum,

Thus, at each instant of time, the system operates in a mode close to the optimal conditions of the process. When the control computer fails (when it fails, as well as when the power supply is turned off), discrete zero-level signals are set up on the control output channels, the power circuits of the group nominal sensor sensors (Electromechanical) are de-energized, and they mechanically memorize their previous position, which unambiguously determines the output pneumatic signal at their outputs. Since this signal previously corresponded to the value of maintaining the process under optimal conditions, then in case of failures, malfunction and deviation x power supply control mashint computing system provides operation modes in units close to optimal until eliminating emergency control computer.

Claims (1)

Invention Formula Pneumatic-electronic centralized monitoring and control system, containing sensors connected to the first group of information inputs of the control and display unit and through the first block of analog-to-digital converters to the first group of input measuring channels of the control computer and the number of sensors for variable flow controllers, actuators associated with the first group of information outputs of the control and display unit with the outputs of the flow regulators and the second group of information in and a control unit odov indikatsii.s vyhoda1 and remote control setting devices, the second group of information outputs of the control unit is connected to a tripping input Editor A.Lezhnina Phie Compiled by O. Gudkova Tehred L. Serdyukova Order 7640/42 Circulation 788 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., A / 5 flow controllers, a group of nominal setting knobs, the outputs of which are connected via the second block of analog-digital converters with the second group of input measuring channels of the control computer, with the nominal channels of the respective flow controllers and the third group of information inputs of the control and display unit The inputs of each block of the group setting units of nominal values are connected with the third group of informational outputs of the control and indication unit, and the second group of control x inputs of each block of the unit setters of the terminal are connected to the output channels of the discrete information of the control computer, the channel for inputting discrete information to the mountain is connected to the fourth information output of the control and display unit, in order to improve the accuracy of the system while controlling the cost ratio , a block of variable ratio coefficients is output to each control loop of the cost ratio, which is output connected to the set-} channels of the corresponding regulators pa - U: ODOV, the gate input - to the outputs of the respective blocks of group setting devices denominations and data inputs - outputs to sootvetst0 five 0 five vuidah sensor. Proofreader L. Beskid Subscription