CN109282145B - Online hot standby pressure regulating method for gas transmission pipeline - Google Patents
Online hot standby pressure regulating method for gas transmission pipeline Download PDFInfo
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- CN109282145B CN109282145B CN201811303101.0A CN201811303101A CN109282145B CN 109282145 B CN109282145 B CN 109282145B CN 201811303101 A CN201811303101 A CN 201811303101A CN 109282145 B CN109282145 B CN 109282145B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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Abstract
The invention discloses an online hot standby pressure regulating method for a gas transmission pipeline, which comprises the following steps: the pressure regulating branch pipeline and the standby pressure regulating branch pipeline are connected; various valves and monitoring equipment are respectively connected in series with an in-use pressure regulating branch pipeline and a standby pressure regulating branch pipeline; connecting each pressure controller and each pressure high relay into an in-use pressure regulating branch pipeline and a standby pressure regulating branch pipeline; inputting natural gas into an in-use pressure regulating branch pipeline and a standby pressure regulating branch pipeline; setting pressure set values of each pressure controller and each pressure high relay; the SCADA system selects an on-line pressure regulating branch pipeline and a standby pressure regulating branch pipeline to carry out on-line pressure regulation according to pressure set values of the first action pressure regulating valve and the second action pressure regulating valve; and after the online pressure regulation is finished, the natural gas is output through the second header. The invention has the beneficial effects that: the whole switching process of the pressure regulating system of the gas pipeline station can be realized, manual intervention is not needed, online automatic completion is realized, stable transition is realized, and the reliability is high.
Description
Technical Field
The invention relates to the technical field of gas transmission pipelines, in particular to an online hot standby pressure regulating method for a gas transmission pipeline.
Background
The pressure regulating system is one of the important facilities of the gas pipeline branch station yard. In order to ensure that the gas is continuously and stably conveyed to the downstream, the design of the pressure regulating system is very important. The pressure regulating system mainly used in the past is cold standby in a switching mode of a using path and a standby path, and mainly comprises a front air collecting pipe, a rear air collecting pipe, an upstream process switch ball valve, an emergency cut-off valve, a pressure regulating valve (comprising a monitoring pressure regulating valve and an action pressure regulating valve), a downstream process ball valve and a pressure controller. The emergency cut-off valve and the pressure regulating valve (the monitoring pressure regulating valve and the action pressure regulating valve) of the use path and the standby path have the same process set value. When the pressure regulating system on the using path has a fault, the fault signal is uploaded and switched to the standby path through the upstream process switch ball valve.
The pressure regulating system in the cold standby mode has the following problems: firstly, not all system faults can be uploaded in a signal form, and when the system faults cannot be uploaded, the standby system cannot be put into use in time, so that potential safety hazards of the whole pressure regulating system are caused; the two pressure regulating systems are cold standby, when the pressure regulating systems of the active/standby circuit need to be switched, the active/standby circuit is switched through an upstream process switch valve, and at the moment, the regulating valves act violently, the pressure cannot be transited relatively stably, and even the risk of overpressure behind the valves exists; and (III) the cold standby pressure regulating system is judged by simple logic, and correspondingly monitors and protects the back pressure excess pressure of the valve, even if the on-line pressure regulating system is cut off to a standby line if necessary, but no corresponding logic for automatic detection and protection is provided for the working condition of blockage or low flow of the on-line pressure regulating system.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an online hot standby pressure regulating method for a gas transmission pipeline, which can realize online automatic switching of pressure regulating paths according to requirements, improve continuity, stability and reliability of detection and control, and facilitate operation and maintenance.
The invention provides an online hot standby pressure regulating method for a gas transmission pipeline, which comprises the following steps:
connecting a used pressure regulating branch pipeline and a spare pressure regulating branch pipeline between a first header and a second header, connecting the first header with a first process pipeline, and connecting the second header with a second process pipeline;
a first process ball valve, a first process ball valve with an actuating mechanism, a first monitoring pressure regulating valve, a first action pressure regulating valve, a first in-situ thermometer, a first pressure transmitter, a second pressure transmitter, a third pressure transmitter, a first check valve and a second process ball valve are sequentially connected in series on the pressure regulating branch pipeline;
connecting a first pressure controller with the first monitoring pressure regulating valve and the first pressure transmitter, connecting a second pressure controller with the first action pressure regulating valve and the second pressure transmitter, and connecting a first pressure high relay with the first process belt actuating mechanism ball valve and the third pressure transmitter;
a seventh process ball valve, a second process ball valve with an actuating mechanism, a second monitoring pressure regulating valve, a second action pressure regulating valve, a second local thermometer, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter, a second check valve and an eighth process ball valve are sequentially connected in series on the standby pressure regulating branch pipeline;
connecting a third pressure controller with the second monitoring pressure regulating valve and the fourth pressure transmitter, connecting a fourth pressure controller with the second action pressure regulating valve and the fifth pressure transmitter, and connecting a second pressure high relay with the second process band actuating mechanism ball valve and the sixth pressure transmitter;
natural gas is input into the first header pipe and respectively enters the in-use pressure regulating branch pipeline and the standby pressure regulating branch pipeline through the first process ball valve and the seventh process ball valve;
setting pressure set values of the first pressure controller, the second pressure controller, the first pressure high relay, the third pressure controller, the fourth pressure controller and the second pressure high relay respectively, and ensuring that the pressure set values of the first operating pressure regulating valve and the second operating pressure regulating valve are different;
the SCADA system selects the in-use pressure regulating branch pipeline or the standby pressure regulating branch pipeline to carry out online pressure regulation according to the pressure set values of the first action pressure regulating valve and the second action pressure regulating valve;
and after the online pressure regulation is finished, the natural gas is output through the second header.
As a further improvement of the present invention, when the in-use pressure regulating branch line is selected for online pressure regulation, the first pressure controller, the second pressure controller and the first pressure high relay respectively control the valve openings of the first monitoring pressure regulating valve, the first action pressure regulating valve and the first process band actuator ball valve according to a pressure set value;
when the standby pressure regulating branch pipeline is selected for online pressure regulation, the third pressure controller, the fourth pressure controller and the second pressure high relay respectively control the valve opening degrees of the second monitoring pressure regulating valve, the second action pressure regulating valve and the second process belt actuating mechanism ball valve according to a pressure set value.
As a further improvement of the present invention, flow signals of the first process belt actuator ball valve, the first monitoring pressure regulating valve, the first operating pressure regulating valve, the second process belt actuator ball valve, the second monitoring pressure regulating valve, and the second operating pressure regulating valve are all connected to an instrument junction box and then sent to an SCADA system for real-time monitoring.
As a further improvement of the invention, the first pressure transmitter, the second pressure transmitter and the third pressure transmitter monitor the pressure values of the first pressure controller, the second pressure controller and the first pressure high-high relay in real time, and send pressure signals into an SCADA system for real-time monitoring after the pressure signals are all connected into an instrument junction box;
and the fourth pressure transmitter, the fifth pressure transmitter and the sixth pressure transmitter monitor the pressure values of the third pressure controller, the fourth pressure controller and the second pressure high-high relay in real time, and send pressure signals into the SCADA system for real-time monitoring after all the pressure signals are connected into the instrument junction box.
As a further improvement of the invention, the temperature signals of the first local temperature meter and the second local temperature meter are sent to the SCADA system for real-time monitoring after being connected to the instrument junction box.
In a further improvement of the present invention, when setting the pressure set value, the pressure set value of the second pressure controller is SP, the pressure set value of the first pressure controller is SP + △ P1, the pressure set value of the first pressure high relay is SP + △ P2, the pressure set value of the fourth pressure controller is SP- △ P1, the pressure set value of the third pressure controller is SP + △ P1, and the pressure set value of the second pressure high relay is SP + △ P2;
wherein, SP + △ P2 is larger than SP + △ P1, SP + △ P1 is larger than SP, and SP is larger than SP- △ P1.
As a further improvement of the invention, the method also comprises the following steps: and emptying the emptying pipelines on the pipeline of the used pressure regulating branch and the pipeline of the standby pressure regulating branch.
As a further improvement of the invention, natural gas on the pipeline using the pressure regulating branch between the first process ball valve and the first process ball valve with the actuator is vented through a first vent pipeline arranged between the first process ball valve and the first process ball valve with the actuator;
natural gas on an in-use pressure regulating branch pipeline between the first process belt actuating mechanism ball valve and the first monitoring pressure regulating valve is discharged through a second discharge pipeline arranged between the first process belt actuating mechanism ball valve and the first monitoring pressure regulating valve;
the natural gas between the first action pressure regulating valve and the first check valve on the pipeline of the pressure regulating branch is discharged through a third discharge pipeline arranged between the first action pressure regulating valve and the first check valve.
As a further improvement of the invention, the natural gas on the spare pressure regulating branch pipeline between the seventh process ball valve and the second process ball valve with the actuator is vented through a fourth vent pipeline arranged between the seventh process ball valve and the second process ball valve with the actuator;
natural gas on a standby pressure regulating branch pipeline between the second process belt actuating mechanism ball valve and the second monitoring pressure regulating valve is discharged through a fifth discharge pipeline arranged between the second process belt actuating mechanism ball valve and the second monitoring pressure regulating valve;
the second action pressure regulating valve with natural gas on the spare pressure regulating branch pipeline between the second check valve passes through the second action pressure regulating valve with the sixth unloading pipeline that sets up between the second check valve carries out the unloading.
As a further improvement of the present invention, when the first process ball valve fails, natural gas enters the in-use pressure regulating branch pipeline through a first bypass pipeline arranged on the first process ball valve;
and when the seventh process ball valve has a fault, natural gas enters the spare pressure regulating branch pipeline through a second bypass pipeline arranged on the seventh process ball valve.
The invention has the beneficial effects that: the whole switching process of the pressure regulating system of the gas pipeline station can be realized, manual intervention is not needed, online automatic completion is realized, stable transition is realized, and the reliability is high.
Drawings
Fig. 1 is a schematic structural diagram of an online hot standby pressure regulating device of a gas transmission pipeline according to an embodiment of the present invention.
1. A first flange; 2. a first process line; 3. a pipe cap; 4. a first header; 5-1, an in-use pressure regulating branch pipeline; 5-2, a first process ball valve; 5-3, a first process-belt actuating mechanism ball valve; 5-4, a first monitoring pressure regulating valve; 5-5, a first action pressure regulating valve; 5-6, a first check valve; 5-7, a second process ball valve; 5-8, a third process ball valve; 5-9, a first stop valve; 5-10, a first bypass line; 5-11, a first vent line; 5-12, a fourth process ball valve; 5-13, a second stop valve; 5-14, a third flange; 5-15, a second vent line; 5-16, a fifth process ball valve; 5-17, a third stop valve; 5-18, a fourth flange; 5-19, a third vent line; 5-20, a sixth process ball valve; 5-21, a fourth stop valve; 5-22 and a fifth flange; 5-23, a first in-situ thermometer; 5-24, a first pressure transmitter; 5-25, a second pressure transmitter; 5-26, a third pressure transmitter; 5-27, a first pressure controller; 5-28, a second pressure controller; 5-29, a first pressure high relay; 5-30, a first instrument cable; 5-31, a second instrument cable; 5-32, a third instrument cable; 5-33, a fourth instrument cable; 5-34, a fifth instrument cable; 5-35, a sixth instrument cable; 6-1, spare pressure regulating branch pipelines; 6-2, a seventh process ball valve; 6-3, a second process-belt actuating mechanism ball valve; 6-4, a second monitoring pressure regulating valve; 6-5, a second action pressure regulating valve; 6-6, a second check valve; 6-7, an eighth process ball valve; 6-8, ninth process ball valve; 6-9, a fifth stop valve; 6-10, a second bypass line; 6-11, a fourth emptying pipeline; 6-12, tenth process ball valve; 6-13 and a sixth stop valve; 6-14 and a sixth flange; 6-15, a fifth emptying pipeline; 6-16, eleventh process ball valve; 6-17, a seventh stop valve; 6-18, seventh flange; 6-19, a sixth vent line; 6-20, a twelfth process ball valve; 6-21, an eighth stop valve; 6-22 and an eighth flange; 6-23, a second in-situ thermometer; 6-24, a fourth pressure transmitter; 6-25, a fifth pressure transmitter; 6-26, a sixth pressure transmitter; 6-27, a third pressure controller; 6-28, a fourth pressure controller; 6-29, a second pressure high relay; 6-30, a seventh instrument cable; 6-31, an eighth instrument cable; 6-32, ninth instrument cable; 6-33, a tenth instrumentation cable; 6-34, an eleventh instrumentation cable; 6-35, a twelfth instrument cable; 7. a second header; 8. a second process line; 9. a second flange.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The embodiment of the invention provides an online hot standby pressure regulating method for a gas transmission pipeline, which comprises the following steps:
a pressure regulating branch pipeline 5-1 and a spare pressure regulating branch pipeline 6-1 are connected between the first collecting pipe 4 and the second collecting pipe 7, the first collecting pipe 4 is connected with the first process pipeline 2, and the second collecting pipe 7 is connected with the second process pipeline 8;
a pressure regulating branch pipeline 5-1 is sequentially connected with a first process ball valve 5-2, a first process ball valve with an actuating mechanism 5-3, a first monitoring pressure regulating valve 5-4, a first action pressure regulating valve 5-5, a first in-situ thermometer 5-23, a first pressure transmitter 5-24, a second pressure transmitter 5-25, a third pressure transmitter 5-26, a first check valve 5-6 and a second process ball valve 5-7 in series;
connecting a first pressure controller 5-27 with a first monitoring pressure regulating valve 5-4 and a first pressure transmitter 5-24, connecting a second pressure controller 5-28 with a first action pressure regulating valve 5-5 and a second pressure transmitter 5-25, and connecting a first pressure high relay 5-29 with a first process band actuator ball valve 5-3 and a third pressure transmitter 5-26;
a seventh process ball valve 6-2, a second process belt actuating mechanism ball valve 6-3, a second monitoring pressure regulating valve 6-4, a second action pressure regulating valve 6-5, a second local thermometer 6-23, a fourth pressure transmitter 6-24, a fifth pressure transmitter 6-25, a sixth pressure transmitter 6-26, a second check valve 6-6 and an eighth process ball valve 6-7 are sequentially connected in series on the spare pressure regulating branch pipeline 6-1;
connecting a third pressure controller 6-27 with a second monitoring pressure regulating valve 6-4 and a fourth pressure transmitter 6-24, connecting a fourth pressure controller 6-28 with a second action pressure regulating valve 6-5 and a fifth pressure transmitter 6-25, and connecting a second pressure high relay 6-29 with a second process band actuator ball valve 6-3 and a sixth pressure transmitter 6-26;
the natural gas is input into a first collecting pipe 4 and respectively enters an in-use pressure regulating branch pipeline 5-1 and a standby pressure regulating branch pipeline 6-1 through a first process ball valve 5-2 and a seventh process ball valve 6-2;
setting pressure set values of a first pressure controller 5-27, a second pressure controller 5-28, a first pressure high relay 5-29, a third pressure controller 6-27, a fourth pressure controller 6-28 and a second pressure high relay 6-29 respectively, and ensuring that the pressure set values of a first action pressure regulating valve 5-5 and a second action pressure regulating valve 6-5 are different;
the SCADA system selects an on-line pressure regulating branch pipeline 5-1 or a standby pressure regulating branch pipeline 6-1 to carry out on-line pressure regulation according to pressure set values of the first action pressure regulating valve 5-5 and the second action pressure regulating valve 6-5;
after the on-line pressure regulation is finished, the natural gas is output through a second header pipe 7.
When the pressure regulating branch pipeline 5-1 is selected for online pressure regulation, the first pressure controller 5-27, the second pressure controller 5-28 and the first pressure high relay 5-29 respectively control the valve opening degrees of the first monitoring pressure regulating valve 5-4, the first action pressure regulating valve 5-5 and the first process zone actuating mechanism ball valve 5-3 according to pressure set values;
when the standby pressure regulating branch pipeline 6-1 is selected for online pressure regulation, the third pressure controller 6-27, the fourth pressure controller 6-28 and the second pressure high relay 6-29 respectively control the valve opening degrees of the second monitoring pressure regulating valve 6-4, the second action pressure regulating valve 6-5 and the second process zone actuator ball valve 6-3 according to pressure set values.
Flow signals of the first process belt actuating mechanism ball valve 5-3, the first monitoring pressure regulating valve 5-4, the first action pressure regulating valve 5-5, the second process belt actuating mechanism ball valve 6-3, the second monitoring pressure regulating valve 6-4 and the second action pressure regulating valve 6-5 are all connected into an instrument junction box and then sent into an SCADA system for real-time monitoring.
The first pressure transmitter 5-24, the second pressure transmitter 5-25 and the third pressure transmitter 5-26 monitor the pressure values of the first pressure controller 5-27, the second pressure controller 5-28 and the first pressure high relay 5-29 in real time, and send pressure signals into the SCADA system for real-time monitoring after being connected into the instrument junction box. And pressure values of the third pressure controller 6-27, the fourth pressure controller 6-28 and the second pressure high relay 6-29 are monitored by the fourth pressure transmitter 6-24, the fifth pressure transmitter 6-25 and the sixth pressure transmitter 6-26 in real time, and pressure signals are all connected into an instrument junction box and then sent into an SCADA system for real-time monitoring.
Temperature signals of the first local temperature meters 5-23 and the second local temperature meters 6-23 are connected into the instrument junction box and then sent into the SCADA system for real-time monitoring.
When the pressure setting value is set, the pressure setting value of the second pressure controller 5-28 is SP + △ P1, the pressure setting value of the first pressure controller 5-27 is SP + △ P2, the pressure setting value of the first pressure high relay 5-29 is SP + △ P2, the pressure setting value of the fourth pressure controller 6-28 is SP- △ P1, the pressure setting value of the third pressure controller 6-27 is SP + △ P1, the pressure setting value of the second pressure high relay 6-29 is SP + △ P2, wherein SP + △ P2 is greater than SP + △ P1, SP + △ P1 is greater than SP, SP is greater than SP- △ P1. normally, △ P1 is 0.05MPa, and ttlt transition & "&Δ &/l/t/g 2 MPa.
The online automatic switching of the used pressure regulating branch pipeline 5-1 and the standby pressure regulating branch pipeline 6-1 is realized without manual intervention by the difference of pressure set values of the first action pressure regulating valve 5-5 on the used pressure regulating branch pipeline 5-1 and the second action pressure regulating valve 6-5 on the standby pressure regulating branch pipeline 6-1.
Further, the method also comprises the following steps: venting lines on the active pressure regulating branch line 5-1 and the standby pressure regulating branch line 6-1.
Specifically, natural gas on the pressure regulating branch pipeline 5-1 between the first process ball valve 5-2 and the first process ball valve with the actuator 5-3 is vented through a first vent pipeline 5-11 arranged between the first process ball valve 5-2 and the first process ball valve with the actuator 5-3.
The natural gas on the used pressure regulating branch line 5-1 between the first process band actuator ball valve 5-3 and the first monitoring pressure regulating valve 5-4 is vented through a second vent line 5-15 provided between the first process band actuator ball valve 5-3 and the first monitoring pressure regulating valve 5-4.
The natural gas on the pressure-regulating branch line 5-1 between the first working pressure regulating valve 5-5 and the first check valve 5-6 is vented through a third vent line 5-19 provided between the first working pressure regulating valve 5-5 and the first check valve 5-6.
And natural gas on a standby pressure regulating branch pipeline 6-1 between the seventh process ball valve 6-2 and the second process ball valve with the actuator 6-3 is vented through a fourth vent pipeline 6-11 arranged between the seventh process ball valve 6-2 and the second process ball valve with the actuator 6-3.
And natural gas on the spare pressure regulating branch pipeline 6-1 between the second process belt actuating mechanism ball valve 6-3 and the second monitoring pressure regulating valve 6-4 is discharged through a fifth discharge pipeline 6-15 arranged between the second process belt actuating mechanism ball valve 6-3 and the second monitoring pressure regulating valve 6-4.
The natural gas on the spare pressure-regulating branch line 6-1 between the second-action pressure-regulating valve 6-5 and the second check valve 6-6 is vented through a sixth vent line 6-19 provided between the second-action pressure-regulating valve 6-5 and the second check valve 6-6.
Further, when the first process ball valve 5-2 is out of order, natural gas enters the in-use pressure regulating branch line 5-1 through a first bypass line 5-10 provided on the first process ball valve 5-2. When the seventh process ball valve 6-2 is in failure, natural gas enters the spare pressure regulating branch pipeline 6-1 through a second bypass pipeline 6-10 arranged on the seventh process ball valve 6-2.
The online hot standby pressure regulating method of the gas transmission pipeline is based on the online hot standby pressure regulating device of the gas transmission pipeline shown in figure 1, and the device comprises an online hot standby pressure control device and a standby online hot standby pressure control device. One of the on-line hot standby pressure control devices comprises an on-line pressure regulating branch pipeline 5-1 and a first pressure regulating controller. The two ends of a pressure regulating branch pipeline 5-1 are respectively connected with a first manifold 4 and a second manifold 7, and a first process ball valve 5-2, a first process ball valve 5-3 with an actuating mechanism, a first monitoring pressure regulating valve 5-4, a first action pressure regulating valve 5-5, a first in-situ thermometer 5-23, a first pressure transmitter 5-24, a second pressure transmitter 5-25, a third pressure transmitter 5-26, a first check valve 5-6 and a second process ball valve 5-7 are sequentially connected in series on the pressure regulating branch pipeline 5-1. The first pressure regulating controller includes a first pressure controller 5-27 connected to the first monitoring pressure regulating valve 5-4 and the first pressure transmitter 5-24, a second pressure controller 5-28 connected to the first actuating pressure regulating valve 5-5 and the second pressure transmitter 5-25, and a first pressure high relay 5-29 connected to the first process band actuator ball valve 5-3 and the third pressure transmitter 5-26.
And the other standby online hot standby pressure control device comprises a standby pressure regulating branch pipeline 6-1 and a second pressure regulating controller. Two ends of a spare pressure regulating branch pipeline 6-1 are respectively connected with a first header 4 and a second header 7, and a seventh process ball valve 6-2, a second process belt actuator ball valve 6-3, a second monitoring pressure regulating valve 6-4, a second action pressure regulating valve 6-5, a second in-situ thermometer 6-23, a fourth pressure transmitter 6-24, a fifth pressure transmitter 6-25, a sixth pressure transmitter 6-26, a second check valve 6-6 and an eighth process ball valve 6-7 are sequentially connected in series on the spare pressure regulating branch pipeline 6-1. The second pressure regulating controller includes a third pressure controller 6-27 connected to the second monitor pressure regulating valve 6-4 and the fourth pressure transmitter 6-24, a fourth pressure controller 6-28 connected to the second actuating pressure regulating valve 6-5 and the fifth pressure transmitter 6-25, and a second pressure high relay 6-29 connected to the second process band actuator ball valve 6-3 and the sixth pressure transmitter 6-26.
Wherein, the first manifold 4 is connected with one end of the first process pipeline 2, the other end of the first process pipeline 2 is connected with the first flange 1, the second manifold 7 is connected with one end of the second process pipeline 8, and the other end of the second process pipeline 8 is connected with the second flange 9. Both ends of the first and second headers 4 and 7 are connected to the cap 3.
The first process ball valve 5-2 is provided with a first bypass pipeline 5-10, one end of the first bypass pipeline 5-10 is connected to an on-use pressure regulating branch pipeline 5-1 between the first collecting pipe 4 and the first process ball valve 5-2, and the other end of the first bypass pipeline 5-10 is connected to an on-use pressure regulating branch pipeline 5-1 between the first process ball valve 5-2 and the first process band actuator ball valve 5-3. The first bypass pipeline 5-10 is connected with a third process ball valve 5-8 and a first stop valve 5-9 in series in sequence along the natural gas flow direction.
One end of a first emptying pipeline 5-11 is connected to an on-use pressure regulating branch pipeline 5-1 between the first process ball valve 5-2 and the first process ball valve with an actuating mechanism 5-3, and the other end of the first emptying pipeline 5-11 is connected with a station emptying system through a third flange 5-14. The first emptying pipeline 5-11 is sequentially connected with a fourth process ball valve 5-12 and a second stop valve 5-13 in series along the natural gas flow direction. One end of a second emptying pipeline 5-15 is connected to an in-use pressure regulating branch pipeline 5-1 between the first process belt actuating mechanism ball valve 5-3 and the first monitoring pressure regulating valve 5-4, and the other end of the second emptying pipeline 5-15 is connected with a station emptying system through a fourth flange 5-18. The fifth process ball valve 5-16 and the third stop valve 5-17 are sequentially connected in series on the second emptying pipeline 5-15 along the natural gas flow direction. One end of a third emptying pipeline 5-19 is connected to an on-use pressure regulating branch pipeline 5-1 between a third pressure transmitter 5-26 and a first check valve 5-6, and the other end of the third emptying pipeline 5-19 is connected with a station emptying system through a fifth flange 5-22. And the third emptying pipeline 5-19 is sequentially connected with a sixth process ball valve 5-20 and a fourth stop valve 5-21 in series along the natural gas flow direction.
A second bypass pipeline 6-10 is arranged on the seventh process ball valve 6-2, one end of the second bypass pipeline 6-10 is connected to a standby pressure regulating branch pipeline 6-1 between the first header 4 and the seventh process ball valve 6-2, and the other end of the second bypass pipeline 6-10 is connected to a standby pressure regulating branch pipeline 6-1 between the seventh process ball valve 6-2 and the second process ball valve with an actuating mechanism 6-3. The ninth process ball valve 6-8 and the fifth stop valve 6-9 are sequentially connected in series on the second bypass pipeline 6-10 along the natural gas flow direction.
One end of a fourth emptying pipeline 6-11 is connected to a spare pressure regulating branch pipeline 6-1 between the seventh process ball valve 6-2 and the second process ball valve with the executing mechanism 6-3, and the other end of the fourth emptying pipeline 6-11 is connected with a station emptying system through a sixth flange 6-14. The tenth process ball valve 6-12 and the sixth stop valve 6-13 are sequentially connected in series on the fourth emptying pipeline 6-11 along the natural gas flow direction. One end of a fifth emptying pipeline 6-15 is connected to a spare pressure regulating branch pipeline 6-1 between the second process belt actuating mechanism ball valve 6-3 and the second monitoring pressure regulating valve 6-4, and the other end of the fifth emptying pipeline 6-15 is connected with a station emptying system through a seventh flange 6-18. And an eleventh process ball valve 6-16 and a seventh stop valve 6-17 are sequentially connected in series on the fifth emptying pipeline 6-15 along the natural gas flow direction. One end of a sixth emptying pipeline 6-19 is connected with a spare pressure regulating branch pipeline 6-1 between the sixth pressure transmitter 6-26 and the second check valve 6-6, and the other end of the sixth emptying pipeline 6-19 is connected with a station emptying system through an eighth flange 6-22. The twelfth process ball valve 6-20 and the eighth stop valve 6-21 are sequentially connected in series on the sixth emptying pipeline 6-19 along the natural gas flow direction.
The first pressure transmitter 5-24 is connected with a first pressure controller 5-27 through a first instrument cable 5-30, the first monitoring pressure regulating valve 5-4 is connected with the first pressure controller 5-27 through a fourth instrument cable 5-33, the second pressure transmitter 5-25 is connected with a second pressure controller 5-28 through a second instrument cable 5-31, the first action pressure regulating valve 5-5 is connected with the second pressure controller 5-28 through a fifth instrument cable 5-34, the third pressure transmitter 5-26 is connected with a first pressure high relay 5-29 through a third instrument cable 5-32, and the first process band actuator ball valve 5-3 is connected with the first pressure high relay 5-29 through a sixth instrument cable 5-35. The fourth pressure transmitter 6-24 is connected with the third pressure controller 6-27 through a seventh instrument cable 6-30, the second monitoring pressure regulating valve 6-4 is connected with the third pressure controller 6-27 through a tenth instrument cable 6-33, the fifth pressure transmitter 6-25 is connected with the fourth pressure controller 6-28 through an eighth instrument cable 6-31, the second action pressure regulating valve 6-5 is connected with the fourth pressure controller 6-28 through an eleventh instrument cable 6-34, the sixth pressure transmitter 6-26 is connected with the second pressure high relay 6-29 through a ninth instrument cable 6-32, and the second process band actuator ball valve 6-3 is connected with the second pressure high relay 6-29 through a twelfth instrument cable 6-35.
The first process belt actuating mechanism ball valve 5-3 and the second process belt actuating mechanism ball valve 6-3 are all full-path double-closing double-leakage valves and fail to close; the first monitoring pressure regulating valve 5-4 and the second monitoring pressure regulating valve 6-4 are both fail-closed; both the first and second actuation pressure regulating valves 5-5 and 6-5 are fail open.
A first check valve 5-6 and a second check valve 6-6 are respectively arranged at the downstream of the third pressure transmitter 5-26 on the used pressure regulating branch pipeline 5-1 and the downstream of the sixth pressure transmitter 6-26 on the standby pressure regulating branch pipeline 6-1, so that the reverse pressure channeling of the used pressure regulating branch pipeline 5-1 and the standby pressure regulating branch pipeline 6-1 is prevented, the pressure collected by the used pressure regulating branch pipeline 5-1 and the standby pressure regulating branch pipeline 6-1 is ensured to be independent, and the process shutoff valves on all the pressure regulating branch pipelines are prevented from being triggered at the same time when the downstream pressure is ultrahigh. All the stop valves of the present invention employ axial flow check valves.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An online hot standby pressure regulating method for a gas transmission pipeline is characterized by comprising the following steps:
a used pressure regulating branch pipeline (5-1) and a spare pressure regulating branch pipeline (6-1) are connected between a first header (4) and a second header (7), the first header (4) is connected with a first process pipeline (2), and the second header (7) is connected with a second process pipeline (8);
a first process ball valve (5-2), a first process ball valve with an actuating mechanism (5-3), a first monitoring pressure regulating valve (5-4), a first action pressure regulating valve (5-5), a first in-place thermometer (5-23), a first pressure transmitter (5-24), a second pressure transmitter (5-25), a third pressure transmitter (5-26), a first check valve (5-6) and a second process ball valve (5-7) are sequentially connected in series on the pressure regulating branch pipeline (5-1);
connecting a first pressure controller (5-27) with the first monitoring pressure regulating valve (5-4) and the first pressure transmitter (5-24), connecting a second pressure controller (5-28) with the first actuating pressure regulating valve (5-5) and the second pressure transmitter (5-25), and connecting a first pressure high relay (5-29) with the first process band actuator ball valve (5-3) and the third pressure transmitter (5-26);
a seventh process ball valve (6-2), a second process ball valve with an actuating mechanism (6-3), a second monitoring pressure regulating valve (6-4), a second action pressure regulating valve (6-5), a second local thermometer (6-23), a fourth pressure transmitter (6-24), a fifth pressure transmitter (6-25), a sixth pressure transmitter (6-26), a second check valve (6-6) and an eighth process ball valve (6-7) are sequentially connected in series on the spare pressure regulating branch pipeline (6-1);
connecting a third pressure controller (6-27) with the second monitoring pressure regulating valve (6-4) and the fourth pressure transmitter (6-24), connecting a fourth pressure controller (6-28) with the second actuating pressure regulating valve (6-5) and the fifth pressure transmitter (6-25), and connecting a second pressure high relay (6-29) with the second process band actuator ball valve (6-3) and the sixth pressure transmitter (6-26);
natural gas is input into the first collecting pipe (4) and respectively enters the active pressure regulating branch pipeline (5-1) and the standby pressure regulating branch pipeline (6-1) through the first process ball valve (5-2) and the seventh process ball valve (6-2);
setting pressure set values of the first pressure controller (5-27), the second pressure controller (5-28), the first pressure high relay (5-29), the third pressure controller (6-27), the fourth pressure controller (6-28) and the second pressure high relay (6-29), respectively, and ensuring that the pressure set values of the first operating pressure regulating valve (5-5) and the second operating pressure regulating valve (6-5) are different;
the SCADA system selects the on-line pressure regulating branch pipeline (5-1) or the standby pressure regulating branch pipeline (6-1) to carry out on-line pressure regulation according to pressure set values of the first action pressure regulating valve (5-5) and the second action pressure regulating valve (6-5);
and after the online pressure regulation is finished, the natural gas is output through the second header (7).
2. The online hot standby pressure regulating method of claim 1, wherein when the online pressure regulation is selected by the online pressure regulating branch line (5-1), the first pressure controller (5-27), the second pressure controller (5-28) and the first pressure high relay (5-29) respectively control the valve openings of the first monitor pressure regulating valve (5-4), the first action pressure regulating valve (5-5) and the first process band actuator ball valve (5-3) according to a pressure set value;
when the standby pressure regulating branch pipeline (6-1) is selected for online pressure regulation, the third pressure controller (6-27), the fourth pressure controller (6-28) and the second high-pressure relay (6-29) respectively control the valve opening degrees of the second monitoring pressure regulating valve (6-4), the second action pressure regulating valve (6-5) and the second process zone executing mechanism ball valve (6-3) according to pressure set values.
3. The online hot standby pressure regulating method for the gas transmission pipeline according to claim 1, wherein flow signals of the first process zone actuator ball valve (5-3), the first monitoring pressure regulating valve (5-4), the first action pressure regulating valve (5-5), the second process zone actuator ball valve (6-3), the second monitoring pressure regulating valve (6-4) and the second action pressure regulating valve (6-5) are all connected to an instrument junction box and then sent to an SCADA system for real-time monitoring.
4. The online hot standby pressure regulating method for the gas transmission pipeline according to claim 1, wherein the first pressure transmitter (5-24), the second pressure transmitter (5-25) and the third pressure transmitter (5-26) monitor the pressure values of the first pressure controller (5-27), the second pressure controller (5-28) and the first pressure high-high relay (5-29) in real time, and send pressure signals into an SCADA system for real-time monitoring after all the pressure signals are connected into an instrument junction box;
and the fourth pressure transmitter (6-24), the fifth pressure transmitter (6-25) and the sixth pressure transmitter (6-26) monitor the pressure values of the third pressure controller (6-27), the fourth pressure controller (6-28) and the second pressure high-high relay (6-29) in real time, and send pressure signals into an SCADA system for real-time monitoring after all the pressure signals are connected into an instrument junction box.
5. The online hot standby pressure regulating method for the gas transmission pipeline according to claim 1, wherein temperature signals of the first local temperature meter (5-23) and the second local temperature meter (6-23) are sent to an SCADA system for real-time monitoring after being connected to an instrument junction box.
6. The online hot standby pressure regulating method for gas transmission pipeline according to claim 1, wherein when setting the pressure set value, the pressure set value of the second pressure controller (5-28) is SP, the pressure set value of the first pressure controller (5-27) is SP + △ P1, the pressure set value of the first pressure high relay (5-29) is SP + △ P2, the pressure set value of the fourth pressure controller (6-28) is SP- △ P1, the pressure set value of the third pressure controller (6-27) is SP + △ P1, and the pressure set value of the second pressure high relay (6-29) is SP + △ P2;
wherein, SP + △ P2 is larger than SP + △ P1, SP + △ P1 is larger than SP, and SP is larger than SP- △ P1.
7. The online hot standby pressure regulating method for the gas transmission pipeline according to claim 1, further comprising: and emptying the emptying pipelines on the used pressure regulating branch pipeline (5-1) and the standby pressure regulating branch pipeline (6-1).
8. The online hot standby pressure regulating method for the gas pipeline according to claim 7, characterized in that the natural gas on the used pressure regulating branch pipeline (5-1) between the first process ball valve (5-2) and the first process ball valve with actuator (5-3) is vented through a first vent pipeline (5-11) arranged between the first process ball valve (5-2) and the first process ball valve with actuator (5-3);
natural gas on a pressure-regulating branch pipeline (5-1) between the first process-band actuator ball valve (5-3) and the first monitoring pressure regulating valve (5-4) is vented through a second vent pipeline (5-15) arranged between the first process-band actuator ball valve (5-3) and the first monitoring pressure regulating valve (5-4);
natural gas on the pressure regulating branch line (5-1) between the first action pressure regulating valve (5-5) and the first check valve (5-6) is vented through a third vent line (5-19) arranged between the first action pressure regulating valve (5-5) and the first check valve (5-6).
9. The online hot standby pressure regulating method for the gas transmission pipeline according to claim 7, wherein natural gas on a standby pressure regulating branch pipeline (6-1) between the seventh process ball valve (6-2) and the second process ball valve with an actuator (6-3) is vented through a fourth vent pipeline (6-11) arranged between the seventh process ball valve (6-2) and the second process ball valve with an actuator (6-3);
natural gas on a standby pressure regulating branch pipeline (6-1) between the second process zone actuator ball valve (6-3) and the second monitoring pressure regulating valve (6-4) is vented through a fifth venting pipeline (6-15) arranged between the second process zone actuator ball valve (6-3) and the second monitoring pressure regulating valve (6-4);
and natural gas on a standby pressure regulating branch pipeline (6-1) between the second action pressure regulating valve (6-5) and the second check valve (6-6) is discharged through a sixth discharge pipeline (6-19) arranged between the second action pressure regulating valve (6-5) and the second check valve (6-6).
10. The online hot standby pressure regulating method for the gas transmission pipeline according to claim 1, characterized in that when the first process ball valve (5-2) fails, natural gas enters the in-use pressure regulating branch pipeline (5-1) through a first bypass pipeline (5-10) arranged on the first process ball valve (5-2);
when the seventh process ball valve (6-2) is in failure, natural gas enters the standby pressure regulating branch pipeline (6-1) through a second bypass pipeline (6-10) arranged on the seventh process ball valve (6-2).
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