CN109442214B - Gas transmission method for natural gas station - Google Patents
Gas transmission method for natural gas station Download PDFInfo
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- CN109442214B CN109442214B CN201811244370.4A CN201811244370A CN109442214B CN 109442214 B CN109442214 B CN 109442214B CN 201811244370 A CN201811244370 A CN 201811244370A CN 109442214 B CN109442214 B CN 109442214B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000007789 gas Substances 0.000 title claims abstract description 52
- 239000003345 natural gas Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 title claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 22
- 230000001960 triggered effect Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000002716 delivery method Methods 0.000 claims 2
- 230000009471 action Effects 0.000 abstract description 7
- 230000035484 reaction time Effects 0.000 abstract description 5
- 238000004092 self-diagnosis Methods 0.000 abstract description 4
- 230000036541 health Effects 0.000 abstract description 3
- 230000004044 response Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
Abstract
The invention relates to the technical field of natural gas transportation, in particular to a natural gas station gas transportation method which is suitable for gas transportation control of gas supply branches of a filtering area and a metering area of a station. The invention provides a natural gas station gas transmission method, which can improve the gas transmission reliability of a natural gas station based on self diagnosis, particularly can automatically judge whether to switch gas supply branches based on the states of a valve and a transmitter on the gas supply branches by diagnosing the health condition of the interlocking gas supply branches in real time, effectively shorten the reaction time required by the branch switching action after the gas supply branches are switched off, further improve the redundancy level of the filtering and metering branches of the natural gas station, and improve the safety and the reliability of the operation of a natural gas pipe network.
Description
Technical Field
The invention relates to the technical field of natural gas transportation, in particular to a natural gas station gas transportation method which is suitable for gas supply branches of a filtering area and a metering area of a station.
Background
At present, the automation level of the domestic natural gas station is generally not high, and the manual gas supply is mainly used for some provinces. In the province with advanced gas supply technology, a natural gas pipe network adopts a Supervisory Control And Data Acquisition (SCADA) System to carry out remote Data Acquisition And process Station monitoring, each Station adopts a Station Control System (Station Control System) taking a Programmable Logic Controller (PLC) as a core to finish Data Acquisition And monitoring tasks of a process in the Station, the operation state And various parameters of process equipment are transmitted to a dispatching Control center in the province through a communication System, commands issued by the dispatching Control center are received at the same time, And the dispatching Control center SCADA System carries out unified monitoring And management. However, the air supply branches are only physically redundant, and when the air supply branches need to be switched, an operator can only operate the relevant valves one by one in sequence through the upper computer to complete the switching of the air supply branches. When the valve in the main branch is accidentally turned off, an operator stops the air supply before processing. Operator flow as shown in fig. 2, failure to recover the supply gas is dependent on the operator's reaction time and processing speed. In addition, if the transmitters and important equipment generate fault alarm on the branches during normal gas supply, the branches cannot be automatically switched, and huge hidden danger is brought to safe production.
The continuity, safety and adjustability of natural gas transmission and distribution are of great importance to natural gas operation, and natural gas pipe networks are different from power grids, and a power plant stops the power grids and can transmit power elsewhere to downstream users, but once the natural gas station stops supplying, the downstream users do not have air, and the life and production of the users are greatly influenced. Taking Zhejiang province as an example, the gas supply amount of a pipe network in Zhejiang province is nearly half of that of a gas power plant, most of direct supply natural gas power plants are closer to the geographical positions of branch transmission sites, and the buffering effect of the capacity of the pipe network on gas storage is weaker. Although the field equipment is configured according to 100% redundancy, the standby loop is in a cold standby state and has no design interlock, and the redundancy switching action among the branches cannot be automatically performed when the gas supply branches have faults such as disconnection; once the branch is shut down due to fault, the standby branch is manually opened on site or remotely, the required response time completely depends on the individual reaction speed of an operator, the long-time air supply interruption and even shutdown are seriously caused, and the shutdown event of the power plant unit caused by the air supply problem frequently occurs in recent years.
Disclosure of Invention
The invention aims to solve the technical problems and provide a technical task to overcome the defects that the automation level of the existing natural gas station is low, the gas safety of downstream users cannot be ensured, and particularly the problem that a fault gas supply branch of a filtering area and a metering area cannot quickly respond to branch switching action to cause the shutoff of a gas supply branch is solved.
The technical scheme adopted by the invention for solving the technical problem is as follows: a gas transmission method of a natural gas station comprises the following steps which are carried out in sequence:
(1) starting the mode of operation
Putting each gas supply branch of the filtering area and the metering area into an interlocking mode or a free mode, wherein the interlocking mode indicates that the branch participates in redundancy, and the free mode indicates that the branch does not participate in redundancy and does not generate any alarm; putting each air supply branch into an interlocking mode under the condition of non-maintenance, wherein the interlocking mode is divided into a primary state or a standby state, the branch with the air supply condition in the interlocking mode is in the primary state, and the branch without the air supply condition in the interlocking mode is in the standby state; when the interlocking mode is put into use, the branch circuit is in a main state or a standby state and is automatically judged by logic, and the logic judgment mode is as follows;
a main state:
(1.1) all BV valves (Ball Valve) on the branch are in an open-to-position state and do not relate to in-position signals;
(1.2) no fault signal of the branch circuit;
(1.3) no ESD signal (Emergency Shut Down);
(1.4) all BV valves on the branch are in a remote control state;
(1.5) putting the flow meter alarm function on the branch corresponding to the metering area into operation;
the branch of the metering area which simultaneously meets the five conditions is in a main state after being put into an interlocking mode; the branch of the filtering area which simultaneously meets the four conditions of (1.2) - (1.4) is in a main state after being put into an interlocking mode;
standby state:
(1.6) all BV valves on the branch are in a normal closed in-place state, or one BV valve is in a normal closed in-place state, and the other BV valve is in a normal open in-place state;
(1.7) no fault signal of the branch circuit;
(1.8) no ESD signal;
(1.9) all BV valves on the branch are in a remote control state;
(1.10) putting the flow meter alarm function on the branch corresponding to the metering area into operation;
the metering area branch which simultaneously meets the five conditions is in a standby state after being put into an interlocking mode; the branch of the filtering area which simultaneously meets the four conditions of (1.6) - (1.9) is in a standby state after being put into an interlocking mode;
the other situations except the above situation can judge to automatically switch to the free mode or manually switch to the free mode;
(2) branch fault signal alarm
When the branch is in the main state, any one of the following conditions is triggered to generate a branch fault signal alarm:
(2.1) any BV valve on the branch generates a closing-in-place signal;
(2.2) alarming when the differential pressure of the filter on the branch exceeds a high limit warning value;
(2.3) a flowmeter fault alarm on a branch corresponding to the metering area;
the two conditions (2.1) and (2.2) are suitable for triggering the filtering area branch fault signal alarm, and the two conditions (2.1) and (2.3) are suitable for triggering the metering area branch fault signal alarm;
(3) interlock mode control logic
When any branch in the active state generates one of the following conditions:
(3.1) branch fault alarming;
(3.2) opening any BV valve on the branch to a local state;
(3.3) the branch flowmeter is in alarm enabling closing;
the branch exits the interlocking mode and is switched to the free mode, and all BV valves on the branch are interlocked and closed when the branch is a metering area branch; in actual operation, because the filtering branch and the metering branch are in different areas, the filtering branch cannot be interlocked with the BV valve, and the metering branch needs to be interlocked with the BV valve after the corresponding branch fails because of the metering accuracy of the flowmeter;
when the number of the branches in the main state is reduced, the branches in the standby state are switched one by one to enter the main state, all BV valves on the branches are opened, and the like until the number of the branches entering the main state is equal to the number of the branches in the main state before the interlocking mode exits.
The invention provides a natural gas station gas transmission method which improves the gas transmission reliability of a natural gas station based on self diagnosis, particularly improves the redundancy level of filtering and metering branches of the natural gas station by diagnosing the health condition of an interlocking branch in real time, greatly shortens the reaction time required by a branch switching action after the gas supply branch is in a turn-off fault, and does not need to increase the equipment cost. The method can be applied to a station control system which adopts an SCADA system and takes PLC, DCS and the like as cores, reasonably applies the existing equipment, improves the redundancy level of filtering and metering branches of the natural gas station, has sensitive and accurate response to the fault shutoff of the gas supply branch, has advanced control, can automatically judge whether to switch the gas supply branch according to the state of a valve and the state of a transmitter, effectively shortens the reaction time required by the branch switching action, and improves the safety and the reliability of the operation of a natural gas pipe network.
As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures: and the branch in the standby state generates an alarm that the differential pressure of the filter exceeds a high limit warning value or a flowmeter fault alarm, and the branch exits the interlocking mode and is switched into the free mode. The branch which generates the alarm when the differential pressure of the filter exceeds the high limit warning value or the fault alarm of the flowmeter is quitted from the interlocking mode and is converted into the free mode, so that the problem that the branch which has the problem participates in redundancy, potential danger is induced by gas supply, the gas transmission stability of a station is increased, the trip risk of users in a power plant is reduced, and the safety and the reliability of the operation of a natural gas pipe network are further improved.
When triggered by an ESD signal, all branches put into interlock mode are switched to free mode. When the ESD signal is triggered by the unexpected loss of the electric power support, all the branches are converted into a free mode, the operation is not carried out, and the potential safety hazard caused by the fact that the electromagnetic valve loses the electric power support and cannot be remotely controlled is prevented. In the natural gas industry, the ESD signal is generated to enable all valves to act according to rules, the response level is highest, and in order to prevent redundant functions from colliding with the ESD signal, all valves are switched into a free mode and controlled by the ESD signal.
And the interlock open command is always applied when the BV valve on the branch in the main state is in the on-position signal disappears. Whether the branch circuit is a fault branch circuit is judged according to whether the valve generates a signal for closing in place or not, and only the valve is opened to disappear without generating the signal for closing in place, so that two possibilities are available: firstly, the valve does not act and the opening position signal disappears, which is the problem of the signal itself but does not affect the air supply, and the alarm pop-up window can remind the operator to pay attention; the second is that the valve does have a valve closing action, but only a pulse signal (because it does not bottom out) can be opened again by applying an interlock on command. Considering that the branch switching can bring the influence on the air transmission stability, the interlock open command is always applied to the main state branch of which the BV valve open-in-place signal disappears, so as to perform early intervention before switching.
The invention provides a self-diagnosis-based gas transmission method for improving gas transmission reliability of a natural gas station, which improves the redundancy level of filtering and metering branches of the natural gas station by diagnosing the health condition of an interlocking branch in real time, greatly shortens the reaction time required by a branch switching action after the gas supply branch is turned off, and does not need to increase the equipment cost; the invention can be combined with the existing intelligent automatic control technology, has sensitive response and convenient control, can increase the stability of station gas transmission, reduce the risk of trip of users in a power plant, and improve the safety and reliability of the operation of a natural gas pipe network.
Drawings
FIG. 1: there is a schematic diagram of a main air supply branch and a secondary air supply branch.
FIG. 2: the prior gas transmission technology is a process flow chart.
FIG. 3: the technical process flow chart of the method is shown in the invention.
Detailed Description
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
A gas transmission method of a natural gas station comprises the following steps which are carried out in sequence:
(1) starting the mode of operation
Putting each gas supply branch of the filtering area and the metering area into an interlocking mode or a free mode, wherein the interlocking mode indicates that the branch participates in redundancy, and the free mode indicates that the branch does not participate in redundancy and does not generate any alarm; putting each air supply branch into an interlocking mode under the condition of non-maintenance, wherein the interlocking mode is divided into a primary state or a standby state, the branch with the air supply condition in the interlocking mode is in the primary state, and the branch without the air supply condition in the interlocking mode is in the standby state; when the interlocking mode is put into use, the branch circuit is in a main state or a standby state and is automatically judged by logic, and the logic judgment mode is as follows;
a main state:
(1.1) all BV valves (Ball Valve) on the branch are in an open-to-position state and do not relate to in-position signals;
(1.2) no fault signal of the branch circuit;
(1.3) no ESD signal (Emergency Shut Down);
(1.4) all BV valves on the branch are in a remote control state;
(1.5) putting the flow meter alarm function on the branch corresponding to the metering area into operation;
the branch of the metering area which simultaneously meets the five conditions is in a main state after being put into an interlocking mode; the branch of the filtering area which simultaneously meets the four conditions of (1.2) - (1.4) is in a main state after being put into an interlocking mode;
standby state:
(1.6) all BV valves on the branch are in a normal closed in-place state, or one BV valve is in a normal closed in-place state, and the other BV valve is in a normal open in-place state;
(1.7) no fault signal of the branch circuit;
(1.8) no ESD signal;
(1.9) all BV valves on the branch are in a remote control state;
(1.10) putting the flow meter alarm function on the branch corresponding to the metering area into operation;
the metering area branch which simultaneously meets the five conditions is in a standby state after being put into an interlocking mode; the branch of the filtering area which simultaneously meets the four conditions of (1.6) - (1.9) is in a standby state after being put into an interlocking mode;
the other situations except the above situation can judge to automatically switch to the free mode or manually switch to the free mode;
(2) branch fault signal alarm
When the branch is in the main state, any one of the following conditions is triggered to generate a branch fault signal alarm:
(2.1) any BV valve on the branch generates a closing-in-place signal;
(2.2) alarming when the differential pressure of the filter on the branch exceeds a high limit warning value;
(2.3) a flowmeter fault alarm on a branch corresponding to the metering area;
the two conditions (2.1) and (2.2) are suitable for triggering the filtering area branch fault signal alarm, and the two conditions (2.1) and (2.3) are suitable for triggering the metering area branch fault signal alarm;
(3) interlock mode control logic
When any branch in the active state generates one of the following conditions:
(3.1) branch fault alarming;
(3.2) opening any BV valve on the branch to a local state;
(3.3) the branch flowmeter is in alarm enabling closing;
the branch exits the interlocking mode and is switched to the free mode, and all BV valves on the branch are interlocked and closed when the branch is a metering area branch;
when the number of the branches in the main state is reduced, the branches in the standby state are switched one by one to enter the main state, all BV valves on the branches are opened, and the like until the number of the branches entering the main state is equal to the number of the branches in the main state before the branch exits the interlocking mode, namely the number of the air supply branches in the main state in the filtering area and the number of the air supply branches in the main state in the metering area are equal to the number of the air supply branches in the main state in the corresponding area before the fault occurs.
In addition, the branch in the standby state generates an alarm that the differential pressure of the filter exceeds a high limit warning value or a flowmeter fault alarm, and the branch exits the interlocking mode and is switched to the free mode; when an ESD signal triggers, all branches which are put into an interlocking mode are switched into a free mode; and the interlock open command is always applied when the BV valve on the branch in the main state is in the on-position signal disappears.
Taking the gas supply branch of one main and two spare as an example shown in fig. 1, the upper discharge pipeline is defined as one branch main, the middle discharge pipeline is two branch spare, and the lower discharge pipeline is three branch spare, and the technical process flow chart using the method of the invention is shown in fig. 3. The gas transmission method carries out self-diagnosis in real time, prohibits the branch which does not meet the gas supply requirement from participating in interlocking, gives a diagnosis report and intuitively tells an operator which conditions are unqualified; after the interlocking is put into use, the air supply branch is in a main state, the standby branch is in a standby state, and when the main branch valve tends to close the valve intentionally, a valve interlocking opening signal is generated to restore the valve to a full-open state; if the valve is continuously closed until the valve is turned off, or a remote control signal of the valve disappears, or a transmitter and important equipment on the main branch generate fault alarm, the invention automatically opens the valve of the standby branch to convert the corresponding branch from the standby state to the main state, and the corresponding branch is put into gas supply, and the response time is within 0.5 second; the first spare branch has no response, and the invention also automatically opens the second spare branch, so that the spare branches are opened one by one until the number of the air supply branches in the main state after the fault is equal to that of the air supply branches in the main state before the fault. Due to the short response time, the invention can effectively solve the problems of air supply interruption caused by accidental turn-off of the valve and downstream air pressure reduction caused by the interruption; meanwhile, the invention can also detect the controllable states of important equipment and valves in real time, avoid gas supply on a faulty branch, avoid the gas supply of the corresponding branch with diseases and on duty, increase the stability of gas transmission in a station, reduce the risk of trip of users in a power plant, and improve the safety and reliability of the operation of a natural gas pipe network.
Claims (4)
1. A gas transmission method of a natural gas station comprises the following steps which are carried out in sequence:
(1) starting the mode of operation
Putting each gas supply branch of the filtering area and the metering area into an interlocking mode or a free mode, wherein the interlocking mode indicates that the branch participates in redundancy, and the free mode indicates that the branch does not participate in redundancy and does not generate any alarm; putting each air supply branch into an interlocking mode under the condition of non-maintenance, wherein the interlocking mode is divided into a primary state or a standby state, the branch with the air supply condition in the interlocking mode is in the primary state, and the branch without the air supply condition in the interlocking mode is in the standby state; when the interlocking mode is put into use, the branch circuit is in a main state or a standby state and is automatically judged by logic, and the logic judgment mode is as follows;
a main state:
(1.1) all BV valves on the branch are in an open-to-position state and do not relate to in-position signals;
(1.2) no fault signal of the branch circuit;
(1.3) no ESD signal;
(1.4) all BV valves on the branch are in a remote control state;
(1.5) putting the flow meter alarm function on the branch corresponding to the metering area into operation;
the branch of the metering area which simultaneously meets the five conditions is in a main state after being put into an interlocking mode; the branch of the filtering area which simultaneously meets the four conditions of (1.2) - (1.4) is in a main state after being put into an interlocking mode;
standby state:
(1.6) all BV valves on the branch are in a normal closed in-place state, or one BV valve is in a normal closed in-place state, and the other BV valve is in a normal open in-place state;
(1.7) no fault signal of the branch circuit;
(1.8) no ESD signal;
(1.9) all BV valves on the branch are in a remote control state;
(1.10) putting the flow meter alarm function on the branch corresponding to the metering area into operation;
the metering area branch which simultaneously meets the five conditions is in a standby state after being put into an interlocking mode; the branch of the filtering area which simultaneously meets the four conditions of (1.6) - (1.9) is in a standby state after being put into an interlocking mode;
the other situations except the above situation can judge to automatically switch to the free mode or manually switch to the free mode;
(2) branch fault signal alarm
When the branch is in the main state, any one of the following conditions is triggered to generate a branch fault signal alarm:
(2.1) any BV valve on the branch generates a closing-in-place signal;
(2.2) alarming when the differential pressure of the filter exceeds a high limit warning value;
(2.3) a flowmeter fault alarm on a branch corresponding to the metering area;
the two conditions (2.1) and (2.2) are suitable for triggering the filtering area branch fault signal alarm, and the two conditions (2.1) and (2.3) are suitable for triggering the metering area branch fault signal alarm;
(3) interlock mode control logic
When any branch in the active state generates one of the following conditions:
(3.1) branch fault alarming;
(3.2) opening any BV valve on the branch to a local state;
(3.3) the branch flowmeter is in alarm enabling closing;
the branch exits the interlocking mode and is switched to the free mode, and all BV valves on the branch are interlocked and closed when the branch is a metering area branch;
when the number of the branches in the main state is reduced, the branches in the standby state are switched one by one to enter the main state, all BV valves on the branches are opened, and the like until the number of the branches entering the main state is equal to the number of the branches in the main state before the interlocking mode exits.
2. The gas delivery method of claim 1, wherein a branch in standby mode generates an alarm that the filter differential pressure exceeds an upper limit alarm value or a flowmeter fault alarm, said branch exiting the interlock mode and switching to the free mode.
3. The gas delivery method of a natural gas station according to claim 1, wherein all branches put into the interlock mode are switched to the free mode when triggered by an ESD signal.
4. The natural gas station gas transmission method according to claim 1, wherein the interlock open command is always applied when the BV valve on-position signal of the branch in the active state disappears.
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| CN109442214A (en) | 2019-03-08 |
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Effective date of registration: 20231026 Address after: No. 1751 Binsheng Road, Binjiang District, Hangzhou City, Zhejiang Province, 310000 Patentee after: Zhejiang Provincial Natural Gas Development Co.,Ltd. Patentee after: ZHEJIANG ENERGY R & D INSTITUTE Co.,Ltd. Address before: 310052 zheneng second building, 1751 Binsheng Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG ZHENENG NATURAL GAS OPERATION CO.,LTD. Patentee before: ZHEJIANG ENERGY R & D INSTITUTE Co.,Ltd. |
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