RU2718101C1 - Automated control system for valve on gas and condensate pipe line - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to gas and oil industry and can be used in automation for control of pneumatic drives and pneumatic hydraulic drives of ball valves of pipelines. Technical result is achieved due to distributed control method based on application of local controller in automated control system of valve on gas condensate conduit, which enables to control valve drive remotely from automated process control system (APCS), remote from APCS programmable logic controller (PLC) terminal, locally by means of PLC of automated control system of valve on gas condensate drain pipe in case of loss of communication with APCS on the basis of measured pressure values, which is part of complex of sensor, and additionally transmit to APCS value of pressure in gas condensate mains, control gas pressure value, information on valve position (open / closed) and diagnostic information on health of pressure sensor and inductive valve position indicators.EFFECT: increased level of safety and reliability of automatic control system of valve.1 cl, 1 dwg

Description

The invention relates to the gas and oil industries and can be applied in the field of automation for controlling pneumatic actuators and pneumatic actuators of ball valves for gas, gas condensate and oil pipelines.

Known automatic emergency shut-off device (RF patent No. 2282088, F16K 17/02, published 08/20/2006), containing a sealed chamber connected to the pipeline and pneumatic cylinder with a piston and rod. This device is equipped with a throttle with a calibrated bore and a compensating pneumatic cylinder. In the compensating pneumatic cylinder, freely communicating with the pipeline, the second end of the rod is placed. The sealed chamber communicates with the pipeline through a throttle with a calibration hole.

The disadvantages of this device include the lack of remote monitoring of process parameters, remote control of the valve, operation only at low pressure, which does not allow protection against increased pressure in the pipeline if the subsequent valve is closed further along the production line, the lack of differential pressure control on the filter does not allow to monitor the degree of pollution of the filter, and if it is completely clogged, this device will also not work.

Known electro-pneumatic control device for actuating ball valves (RF patent No. 2330192, F15B 9/03, F16K 31/126, published July 27, 2008), containing two electromagnets and two reed switches in flameproof enclosure, pneumatic valves and a panel with input and output channels of the working gas to a ball valve actuator, and is also equipped with an automatic emergency shut-off device for a ball valve in the form of a pneumatic cylinder with a calibration valve that responds to the rate of pressure drop in the main gas pipeline. When the rate of falling above a predetermined one is reached, the pneumatic cylinder is activated and, by moving the rod, acts on the spring mechanism, which includes a pneumatic valve for closing the ball valve. The device is equipped with a strap with an adjusting screw on a spring mechanism, a rotary lever with a permanent magnet at one end thereof, the lever using a bracket mounted on a flameproof enclosure, and a third reed switch is additionally installed inside the flameproof enclosure. The pivot arm is configured to influence its permanent magnet on a third additional reed switch when the spring mechanism is activated. In this case, the pivot arm is connected by an additional spring to the panel so that the other end is constantly in contact with the adjusting screw of the strap of the spring mechanism.

The known device provides the opening or closing of a ball valve by remotely supplying a signal to the electromagnets from the control room, as well as local control of the ball valve by manually acting on the control levers of the pneumatic valves. The device also provides automatic closing of the ball valve in the event of a rupture of the main gas pipeline, with blocking the remote start.

The disadvantages of this device include the use in the design of obsolete equipment without the function of remote diagnostics, a large number of mechanical moving components, which significantly reduces the reliability of the system and requires the constant presence of maintenance personnel for maintenance and repair, in particular, in case of failure of the reed switch , information about the position of the crane may be unreliable, and the function of blocking the opening is not functional, which will be found out only upon eneniya position of the crane or during maintenance.

According to the technological functions performed, this device is closest to the technical solution claimed as an invention and can be adopted as a prototype.

The task to which the claimed technical solution is directed is to expand the arsenal of technical means in this area, as well as to increase the reliability and safety of the control system for ball valve actuators of gas mains.

The problem is solved in that the automated control system of the valve on the gas condensate pipeline, which includes a local control system built on an industrial controller in an explosion-proof enclosure, pipelines and valves, is characterized in that in order to increase the level of safety and reliability for controlling the valve on the gas condensate pipeline in the structure of the automated control system of the valve on the gas condensate pipeline includes a pressure switch, pressure sensor, quick disconnect connection, a portable moisture analyzer, an optical communication line, equipment for connecting an optical line to an automated process control system (hereinafter - ACS TP), as well as a distributed control system built on a program-logic controller (hereinafter - PLC) of an automated process control system and on the local PLC of the automated control system of the valve on the gas condensate pipeline, which allows you to remotely control the position of the valve, diagnose the state of the crane equipment, and also in the event of loss of connection with the process control system or the process control system PLC, close the valve in case of emergency without the participation of personnel according to emergency protection algorithms embedded in the PLC of the automated control system of the valve on the gas condensate pipeline.

The technical result provided by the given set of features is to increase the level of safety and reliability of the automatic crane control system due to the distributed control method based on the use of a local controller as part of an automated crane control complex on the gas condensate pipeline, which allows controlling the crane drive remotely from the control system (remotely from the control panel production and dispatch service and teams with process control systems, formed in accordance with the algorithm ami of automatic protection), remotely from the PLC control system (the terminal and PLC control system installed in the block box at a distance of 100-200 meters from the tap), locally through the PLC of the automated control system of the tap on the gas condensate pipeline in case of loss of connection with the control system based on the measured pressure values, which is a part of the complex, as well as additionally transfer to the process control system the pressure value in the gas condensate pipeline, the pressure of the control gas, information about the valve position (open / closed) and diagnostic For information about the serviceability of the pressure sensor and inductive sensors of the crane position.

The presented drawing illustrates the essence of the invention, where the claimed automated control system for a crane on a gas condensate pipeline is schematically depicted (Fig.).

The automated control system of the tap on the gas condensate pipeline includes a control cabinet 1 of the appropriate climate design, explosion-proof boxes 2 and 3, a pressure sensor 4 installed on the gas condensate pipeline, a pressure switch 5 connected by an impulse line 6 through shut-off valves 7 to the control gas supply pipe 8, a portable analyzer humidity (not shown in the diagram), connected to the impulse line 6 through a quick disconnect 9 and shutoff valves 10, PLC automated control complex a crane 11, installed in the explosion-proof box 2, controlling solenoid valves via wire control lines 12 and 13 through isolation unit 14, which allows control via wire control lines 15 and 16 from ASUTTP 17 PLC and wire control lines 18 and 19 of PLC automated complex control crane 11, forming a team depending on the mode of operation. In the standard “remote” mode, the system is controlled by the ASUTP 17 PLC and the closing / opening signals are generated via physical wire channels and duplicated via network transmission via fiber-optic communication line 20 (hereinafter - FOCL). In the event of an emergency shutdown of the ASUTP 17 PLC, the PLC of the automated control system of the valve 11 transfers the automated control system of the valve on the gas condensate pipeline to “local mode” and generates control commands according to the emergency control algorithm built into it, based on data received from pressure sensor 4, the pressure switch 5, and inductive signaling devices of end positions (not shown in the diagram) connected to the PLC of the automated control complex of the crane 11 via wire control lines 21 and 22 and ASUTP 17 PLC via wire control lines 23 and 24 through the isolation module 25 by wire lines 26 and 27, which allows to obtain data on the position of the crane at the same time as PLCs of the automated control system of the crane 11 and ПЖС АУСТП 17. FOCL 20 allows you to organize data transmission from The PLC of the automated control complex of the crane 11 through the media converters 28 and 29 in the control system 30 and in the diagnostic system of operability of automation equipment 31.

The automated control system of the valve on the gas condensate pipeline operates as follows in three modes: remote, local automatic and manual.

1. Remote mode is the main control mode. In this case, the crane drive is controlled by the PLC of the control system 17 in accordance with the emergency protection algorithm and the commands received from the control system 30.

When closing the crane in remote mode, the PLC of the ACS TP 17 generates a control action on the solenoid valve for closing the crane in the following situations:

- a signal to close the crane from the control panel of the production and dispatch service of the industrial control system 30;

- issuance by the maintenance personnel of a command to close the crane from the ПЖ АСУТП 17 terminal;

- issuance by the maintenance personnel of a command to close the crane from the control panel of the crane unit of the control cabinet 1;

- the signal to close the crane in the event of an emergency upstream of the control system 30;

- the occurrence of an emergency on this crane unit, the criteria for which are:

a) the receipt of signals about the decrease in pressure in the gas condensate pipeline below the set value from any two of the three pressure sensors conducting measurements on this crane unit, namely from the sensor connected to the PLC of ACS TP 17, from sensor 4, which is part of the automated control system of the valve, and from the electric contact pressure gauge (hereinafter referred to as the ECM) connected to the PLC of the ACS TP 17;

b) the receipt of signals about the increase in pressure in the gas condensate pipeline above the set value from any two of the three pressure sensors that measure on this crane unit, namely from the sensor connected to the PLC of ACS TP 17, from sensor 4, which is part of the automated control system of the valve , and from an ECM connected to the PCS APC 17.

An emergency situation will not be considered as the appearance of one signal about a decrease or increase in pressure in the gas condensate pipeline beyond the limits of the set values.

This case is interpreted as “abnormal”, which can be caused by hydrate formation in valve assemblies of pressure sensors or a malfunction in their measuring channels.

In these situations, the PLC of the control system 17 generates an information signal in the control system 30 and the diagnostic system of the operability of automation equipment 31.

In the event of a failure of one or more devices that control the pressure in the gas condensate pipeline (pressure sensor and ECM connected to the ASUTP 17 PLC and pressure sensor 4, which is part of the PLC of the automated control system of the valve 11), the condition for the need for two alarms is turned off and the stop is made by the signals of any of the remaining operational devices.

The control action from the PLC of ASU TP 17 on the solenoid valve for closing the crane will be removed when a signal is received from the inductive signaling device of the end position signaling the closing of the crane. If after 2 minutes after the control command is issued, this signal does not arrive, the PLC of the automatic control system 17 removes the control action supplied to the solenoid valve for closing the crane, and by FOCL 20 issues a command to the PLC of the automated control system of the crane 11 - “Close the crane”, which in turn, forms a control action on the solenoid valve for closing the crane along the wire control line 12.

In the absence of a signal from the inductive end position signaling that the crane is closing after 2 minutes after issuing a control command via FOCL 20, the PLC of the automated crane control complex 11 removes the control action supplied to the solenoid valve for closing the crane, and transmits a signal through FOCL 20 to PLC ASU TP 17 about the failure of the control system of the drive valve of the gas condensate pipeline. This information is transmitted to the diagnostic system 31 operability of automation equipment.

When opening the crane in remote mode, the PLC of the control system 17 creates a control action on the solenoid valve for opening the crane in the following situations:

- the signal to open the crane from the control panel of the production and dispatch service of industrial control system 30;

- issuance by the maintenance personnel of a command to open a crane from the ПЖ АСУТП 17 terminal;

- issuance by the maintenance personnel of a command to open the crane from the control panel located in the control cabinet 1.

The control action from the PLC of ASU TP 17 on the solenoid valve for opening the crane will be removed when a signal is received from the inductive signaling device of the end position signaling the opening of the crane. If after 2 minutes after issuing the control command this signal does not arrive, the PLC of the control system 17 removes the control action supplied to the solenoid valve for opening the crane, and FOCL 20 issues a command to the PLC of the automated control system of the crane 11 - “Open the crane” which in turn, forms a control action on the solenoid valve for opening the crane along the wire control line 13.

In the absence of a signal from the inductive end position signaling device that signals the crane to open after 2 minutes after issuing the control command, the PLC of the automated control system of the crane 11 removes the control action supplied to the electromagnetic valve for opening the crane, and transmits a signal to the PLC via FOCL 20 ACS TP 17 on the failure of the control system of the gas condensate pipeline crane drive. This information is transmitted to the diagnostic system 31 operability of automation equipment.

2. Local automatic control mode

In the local automatic control mode, the automated control system of the valve on the gas condensate pipeline goes under the following conditions:

- communication failure between the PLC of the ACS TP 17 and the PLC of the automated control complex of the crane 11 according to the network protocol for 30 seconds. When communication resumes, the automated control system of the tap on the gas condensate pipeline automatically switches to “Remote control mode”;

- inclusion of the local mode from the PLC terminal of the industrial control system 17.

The transition to the "remote control mode" is also carried out from the terminal ПЖ АСУ ТП 17.

In this mode:

- The automated control system of the valve on the gas condensate pipeline autonomously generates a control action on the solenoid valve for closing the valve upon receipt from the pressure sensor 4, which is part of the automated control system of the valve on the gas condensate pipeline, a signal indicating a decrease or increase in pressure in the gas condensate pipeline outside the set values;

- ПЖ АСУ ТП 17 generates a control action on the solenoid valve for closing the valve according to any of two signals coming from a pressure sensor connected to the PLC of the АСУ ТП 17 or from an ECM (when the pressure or pressure in the gas condensate pipeline decreases or increases beyond the set values).

3. Manual control mode.

Manual mode is carried out using the control panel located in the control cabinet 1. Commands from the control panel located in the control cabinet 1 have priority in the execution of commands, while the PLC of the automated control system of the crane 11 through FOCL 20 transmits information about the executed commands to the PLC of the control system 17, where this information is stored in the history of events.

Claims (1)

An automated control system for a tap on a gas condensate pipeline, including a local control system built on an industrial controller in an explosion-proof enclosure, pipelines and valves, characterized in that the automated control system for a tap on a gas condensate pipeline includes a pressure switch, pressure sensor, quick-disconnect connection, a portable moisture analyzer , optical communication line, equipment for connecting an optical line to an automated control system technological processes, as well as a distributed control system, built on the program-logic controller of the automated process control system and on the local program-logic controller of the automated control system of the valve on the gas condensate pipeline, which allows you to remotely control the position of the valve, diagnose the condition of the crane equipment, and also in case of loss of communication with the automated process control system or ogrammno-PLC automated process control system, close the valve in case of emergencies unattended on algorithms of emergency protection laid down in the program-logic controller automated crane control complex gazokondensatoprovode.

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