CN118375855A - Online control device and method for natural gas pipeline gas - Google Patents
Online control device and method for natural gas pipeline gas Download PDFInfo
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- CN118375855A CN118375855A CN202410554405.3A CN202410554405A CN118375855A CN 118375855 A CN118375855 A CN 118375855A CN 202410554405 A CN202410554405 A CN 202410554405A CN 118375855 A CN118375855 A CN 118375855A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 216
- 239000007789 gas Substances 0.000 title claims abstract description 132
- 239000003345 natural gas Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 87
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000011144 upstream manufacturing Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 abstract description 4
- 238000013022 venting Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
The invention provides a natural gas pipeline gas on-line control device and method, and relates to the technical field of natural gas pipeline control; the gas inlet electromagnetic valve, the gas taking electromagnetic valve and the air vent electromagnetic valve are respectively arranged at the gas inlet, the gas taking electromagnetic valve and the air vent of the natural gas pipeline to be controlled, the nitrogen input equipment is communicated with the natural gas pipeline to be controlled through the gas inlet electromagnetic valve, the control system is electrically connected with the gas inlet electromagnetic valve, the gas detector is communicated with the natural gas pipeline to be controlled through the gas taking electromagnetic valve, the control system is electrically connected with the gas detector, and the control system is also electrically connected with the air vent electromagnetic valve; the invention realizes the automatic control functions of pipeline gas venting, gas replacement and gas detection, and reduces the risk of pipeline ventilation operation.
Description
Technical Field
The invention mainly relates to the technical field of natural gas pipeline control, in particular to a natural gas pipeline gas on-line control device and method.
Background
The natural gas station belongs to inflammable and explosive places, pipeline opening operation is common high-risk operation of the natural gas station, nitrogen is needed to replace natural gas before pipeline opening, and nitrogen is needed to replace air before pipeline boosting, so that gas replacement qualification is a precondition for ensuring operation safety, and for a natural gas metering verification station, the pipeline opening operation is performed for 4-6 times each day, and the natural gas metering verification station has the characteristics of high frequency and high risk.
The existing gas replacement is to utilize a manual valve opening air guiding body replacement process, the gas detection is to utilize an air discharging port of a pressure gauge or a pressure transmitter and the like to discharge air, the hand-held composite gas detection alarm is used for detecting the air at the air discharging port, the gas is directly discharged into a station, the safety is low, and the operation level of personnel is greatly depended.
Disclosure of Invention
The invention aims to solve the technical problem of providing an on-line control device and method for natural gas pipeline gas aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the natural gas pipeline gas on-line control device comprises a gas inlet electromagnetic valve, a gas outlet electromagnetic valve, a vent electromagnetic valve, a control system, a gas detector and nitrogen input equipment;
the air inlet electromagnetic valve, the air taking electromagnetic valve and the air discharging electromagnetic valve are respectively arranged at the air inlet, the air taking electromagnetic valve and the air discharging electromagnetic valve of the natural gas pipeline to be controlled;
The nitrogen input equipment is communicated with the natural gas pipeline to be controlled through the air inlet electromagnetic valve, and the control system is electrically connected with the air inlet electromagnetic valve; the gas detector is communicated with the natural gas pipeline to be controlled through the gas taking port electromagnetic valve, and the control system is electrically connected with the gas detector; the control system is also electrically connected with the vent electromagnetic valve;
The control system is used for obtaining a plurality of first pressure values in the natural gas pipeline to be controlled in real time from the gas detector according to the selected emptying mode, and controlling the opening of the emptying port electromagnetic valve according to the plurality of first pressure values;
The control system is further used for obtaining a second pressure value in the natural gas pipeline to be controlled from the gas detector when the selected replacement mode is finished in a preset time period, determining whether the gas in the natural gas pipeline to be controlled is exhausted or not according to the second pressure value, and if so, controlling the electromagnetic valve of the air vent to be closed and controlling the electromagnetic valve of the air inlet to be opened;
The control system is also used for obtaining the nitrogen content parameter in the natural gas pipeline to be controlled from the gas detector in real time according to the selected detection mode, judging whether the detection is qualified according to the nitrogen content parameter, and controlling the closing of the electromagnetic valve of the gas inlet if the detection is qualified.
On the basis of the technical scheme, the invention can be improved as follows.
Further, in the control system, controlling the opening degree of the vent solenoid valve according to the plurality of first pressure values includes:
And comparing the first pressure values with a set safety range value respectively, if the first pressure value is larger than the set safety range value, reducing the opening of the vent solenoid valve, if the first pressure value is smaller than the set safety range value, increasing the opening of the vent solenoid valve, and if the first pressure value is equal to the set safety range value, maintaining the current opening of the vent solenoid valve.
Further, in the control system, determining whether the gas in the natural gas pipeline to be controlled is exhausted according to the second pressure value includes:
and comparing the second pressure value with an ordinary pressure value, and if the second pressure value is equal to the ordinary pressure value, determining that the gas in the natural gas pipeline to be controlled is exhausted.
Further, in the control system, determining whether the gas in the natural gas pipeline to be controlled is exhausted according to the second pressure value, and further includes:
And if the second pressure value is larger or smaller than the normal pressure value, controlling the opening of the vent solenoid valve according to the second pressure value, obtaining a second pressure value in the natural gas pipeline to be controlled from the gas detector when the preset time period is over, and determining whether the gas in the natural gas pipeline to be controlled is exhausted according to the second pressure value, so that the cycle is performed.
Further, in the control system, judging whether the detection is qualified according to the nitrogen content parameter includes:
and comparing the nitrogen content parameter with a set nitrogen content standard parameter range, if the nitrogen content parameter is within the set nitrogen content standard parameter range, detecting to be qualified, otherwise, detecting to be unqualified, and continuously opening the air inlet electromagnetic valve.
Further, the natural gas pipeline gas on-line control device further comprises a blow-down torch, wherein the blow-down torch is communicated with the natural gas pipeline to be controlled through a blow-down port electromagnetic valve, and the blow-down torch is electrically connected with the gas detector;
the control system is used for starting the emptying torch according to the selected emptying mode.
Further, the air inlet electromagnetic valve is arranged at an air inlet of the upstream section of the natural gas pipeline to be controlled, the air outlet electromagnetic valve is arranged at an air outlet of the downstream section of the natural gas pipeline to be controlled, and the air outlet electromagnetic valve is arranged at an air outlet between the upstream section and the downstream section of the natural gas pipeline to be controlled.
The other technical scheme for solving the technical problems is as follows: an on-line control method for natural gas pipeline gas comprises the following steps:
acquiring a plurality of first pressure values in a natural gas pipeline to be controlled in real time from a gas detector according to the selected emptying mode, and controlling the opening of an emptying port electromagnetic valve according to the plurality of first pressure values;
When the selected replacement mode is over the preset time period, a second pressure value in the natural gas pipeline to be controlled is obtained from the gas detector, whether the gas in the natural gas pipeline to be controlled is exhausted or not is determined according to the second pressure value, if yes, the electromagnetic valve of the air vent is controlled to be closed, and the electromagnetic valve of the air inlet is controlled to be opened;
And acquiring nitrogen content parameters in the natural gas pipeline to be controlled from the gas detector in real time according to the selected detection mode, judging whether the detection is qualified according to the nitrogen content parameters, and if the detection is qualified, controlling the electromagnetic valve of the gas inlet to be closed.
The beneficial effects of the invention are as follows: the natural gas pipeline to be controlled is provided with the gas inlet electromagnetic valve, the gas outlet electromagnetic valve, the emptying port electromagnetic valve, the gas detector and the nitrogen input equipment, and the control system obtains the relevant information of the gas state in the pipeline from the gas detector, so that the operation of each electromagnetic valve is controlled, the automatic control functions of the gas emptying, the gas replacement and the gas detection of the pipeline are realized, and the risk of the pipeline ventilation operation is reduced.
Drawings
FIG. 1 is a schematic diagram of connection of components of a natural gas pipeline gas on-line control device according to an embodiment of the present invention;
Fig. 2 is a schematic flow chart of a method for on-line control of natural gas pipeline gas according to an embodiment of the present invention.
In the drawings, the names of the components represented by the respective marks are as follows:
1. An air inlet electromagnetic valve; 2. an air taking port electromagnetic valve; 3. an air vent solenoid valve; 4. a control system; 5. a gas detector; 6. nitrogen gas input equipment; 7. venting the torch; 8. a natural gas pipeline to be controlled; 9. an air inlet; 10. an air taking port; 11. an air vent; 13. a pipeline upstream ball valve; 14. a pipeline downstream ball valve; 101. a first ball valve; 301. and a second ball valve.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1:
As shown in fig. 1, the embodiment of the invention provides a natural gas pipeline gas on-line control device, which comprises a gas inlet electromagnetic valve 1, a gas outlet electromagnetic valve 2, a vent electromagnetic valve 3, a control system 4, a gas detector 5 and a nitrogen input device 6;
The air inlet electromagnetic valve 1, the air outlet electromagnetic valve 2 and the air outlet electromagnetic valve 3 are respectively arranged at an air inlet 9, an air outlet 10 and an air outlet 11 of a natural gas pipeline 8 to be controlled;
The nitrogen input equipment 6 is communicated with the natural gas pipeline 8 to be controlled through the air inlet electromagnetic valve 1, and the control system 4 is electrically connected with the air inlet 9 electromagnetic valve 1; the gas detector 5 is communicated with the natural gas pipeline 8 to be controlled through the gas taking port electromagnetic valve 2, and the control system 4 is electrically connected with the gas detector 5; the control system 4 is also electrically connected with the vent electromagnetic valve 3;
The control system 4 is configured to obtain, in real time, a plurality of first pressure values in the natural gas pipeline 8 to be controlled from the gas detector 5 according to the selected blowdown mode, and control the opening of the blowdown port electromagnetic valve 3 according to the plurality of first pressure values;
The control system 4 is further configured to obtain a second pressure value in the natural gas pipeline 8 to be controlled from the gas detector 5 when the preset time period is over according to the selected replacement mode, determine whether the gas in the natural gas pipeline 8 to be controlled is exhausted according to the second pressure value, if so, control the air vent electromagnetic valve 3 to be closed, and control the air inlet electromagnetic valve 1 to be opened; to communicate the natural gas pipeline 8 to be controlled with the nitrogen input device 6, so that nitrogen enters the pipeline.
The control system 4 is further configured to obtain, in real time, a nitrogen content parameter in the natural gas pipeline 8 to be controlled from the gas detector 5 according to the selected detection mode, determine whether the detection is qualified according to the nitrogen content parameter, and if the detection is qualified, control the gas inlet electromagnetic valve 1 to close. Thereby closing the connection of the nitrogen input device 6 to the natural gas pipeline 8 to be controlled.
It should be understood that the mode selection may be set as required in advance, and selected in the interface of the control system 4, and the control system 4 performs the control task of the corresponding respective connection component according to the selected relevant mode. The interface may be displayed via a display screen.
Preferably, the valve further comprises a first ball valve 101, and the first ball valve 101 and the air inlet electromagnetic valve 1 are sequentially installed according to the air inlet direction.
Preferably, the device further comprises a second ball valve 301, and the second ball valve 301 and the vent solenoid valve 3 are sequentially arranged according to the air outlet direction.
Preferably, the system further comprises a pipeline upstream ball valve 12 and a pipeline upstream ball valve 13, wherein the pipeline upstream ball valve 12 is arranged at an upstream pipe mouth of the natural gas pipeline 8 to be controlled, and the pipeline upstream ball valve 13 is arranged at a downstream pipe mouth of the natural gas pipeline 8 to be controlled, and is used for closing an upstream pipe mouth and/or a downstream pipe mouth when an emergency occurs.
The control system 4 may control the various connected components by means of remote control. Preferably an electrical connection of a wireless network.
In the above embodiment, the gas inlet electromagnetic valve 1, the gas outlet electromagnetic valve 2, the vent electromagnetic valve 3, the gas detector 5 and the nitrogen input device 6 are installed on the natural gas pipeline 8 to be controlled, and the control system 4 obtains the relevant information of the gas state in the pipeline from the gas detector 5, so as to control the operation of each electromagnetic valve, realize the automatic control functions of pipeline gas venting, gas replacement and gas detection, and reduce the risk of pipeline ventilation operation.
Preferably, the air inlet electromagnetic valve 1 is arranged at an air inlet of an upstream section of the natural gas pipeline 8 to be controlled, the air outlet electromagnetic valve 2 is arranged at an air outlet of a downstream section of the natural gas pipeline 8 to be controlled, and the air outlet electromagnetic valve 3 is arranged at an air outlet 11 between the upstream section and the downstream section of the natural gas pipeline 8 to be controlled.
In the above embodiment, the air inlet electromagnetic valve 1, the air outlet electromagnetic valve 2 and the air outlet electromagnetic valve 3 can be reasonably arranged on the natural gas pipeline 8 to be controlled, and the operation of each electromagnetic valve can be controlled on line through the control device.
Preferably, in the control system 4, controlling the opening degree of the vent solenoid valve 3 according to a plurality of the first pressure values includes:
And comparing the first pressure values with a set safety range value, if the first pressure value is larger than the set safety range value, reducing the opening of the vent solenoid valve 3, if the first pressure value is smaller than the set safety range value, increasing the opening of the vent solenoid valve 3, and if the first pressure value is equal to the set safety range value, maintaining the current opening of the vent solenoid valve 3.
In the above embodiment, the opening of the vent solenoid valve 3 can be adjusted, the slow opening is adjusted, and the pressure drop in the pipeline is ensured to be controlled within a safe range.
Preferably, in the control system 4, determining whether the natural gas pipeline 8 to be controlled is empty according to the second pressure value includes:
The second pressure value is compared with an atmospheric pressure value and if the second pressure value is equal to the atmospheric pressure value, it is determined that the gas in the natural gas pipeline 8 to be controlled has been exhausted.
In the embodiment, whether the gas in the pipeline is exhausted or not can be automatically determined, so that the number of pipeline opening operations is reduced, and the operation risk is reduced.
Preferably, in the control system 4, determining whether the natural gas pipeline 8 to be controlled is empty or not according to the second pressure value further includes:
And if the second pressure value is greater than or less than the normal pressure value, controlling the opening of the vent electromagnetic valve 3 according to the second pressure value, obtaining a second pressure value in the natural gas pipeline 8 to be controlled from the gas detector 5 when the preset time period is over, and determining whether the gas in the natural gas pipeline 8 to be controlled is exhausted according to the second pressure value, so as to circulate.
In the above embodiment, when the pressure value is not equal to the normal pressure value, it is indicated that the gas is not exhausted, and then the opening of the vent solenoid valve 3 needs to be adjusted by comparing the current pressure value with the set safety range value, so as to circulate, thereby safely exhausting the gas in the pipeline.
Preferably, in the control system 4, determining whether the detection is qualified according to the nitrogen content parameter includes:
and comparing the nitrogen content parameter with a set nitrogen content standard parameter range, if the nitrogen content parameter is within the set nitrogen content standard parameter range, detecting to be qualified, otherwise, detecting to be unqualified, and continuously opening the air inlet electromagnetic valve 1.
In the embodiment, whether the nitrogen content in the pipeline meets the standard can be automatically judged, the dependence on the manual operation level is reduced, and the detection is safe, reliable and efficient.
Preferably, the natural gas pipeline gas on-line control device further comprises a blow-down torch 7, wherein the blow-down torch 7 is communicated with the natural gas pipeline 8 to be controlled through a blow-down port electromagnetic valve 3, and the blow-down torch is electrically connected with the gas detector 5;
The control system 4 is arranged to turn on the flare 7 according to a selected flare mode.
In the above embodiment, the gas in the pipe can be safely discharged automatically by the discharging torch 7.
Example 2:
As shown in fig. 2, the embodiment of the invention provides a natural gas pipeline gas on-line control method, which adopts the natural gas pipeline gas on-line control device as described above, and comprises the following steps:
acquiring a plurality of first pressure values in a natural gas pipeline to be controlled in real time from a gas detector according to the selected emptying mode, and controlling the opening of an emptying port electromagnetic valve according to the plurality of first pressure values;
When the selected replacement mode is over the preset time period, a second pressure value in the natural gas pipeline to be controlled is obtained from the gas detector, whether the gas in the natural gas pipeline to be controlled is exhausted or not is determined according to the second pressure value, if yes, the electromagnetic valve of the air vent is controlled to be closed, and the electromagnetic valve of the air inlet is controlled to be opened;
And acquiring nitrogen content parameters in the natural gas pipeline to be controlled from the gas detector in real time according to the selected detection mode, judging whether the detection is qualified according to the nitrogen content parameters, and if the detection is qualified, controlling the electromagnetic valve of the gas inlet to be closed.
Preferably, the controlling the opening degree of the vent solenoid valve according to the plurality of first pressure values includes:
And comparing the first pressure values with a set safety range value respectively, if the first pressure value is larger than the set safety range value, reducing the opening of the vent solenoid valve, if the first pressure value is smaller than the set safety range value, increasing the opening of the vent solenoid valve, and if the first pressure value is equal to the set safety range value, maintaining the current opening of the vent solenoid valve.
Preferably, the determining whether the gas in the natural gas pipeline to be controlled is exhausted according to the second pressure value includes:
and comparing the second pressure value with an ordinary pressure value, and if the second pressure value is equal to the ordinary pressure value, determining that the gas in the natural gas pipeline to be controlled is exhausted.
According to the invention, the air inlet electromagnetic valve, the air outlet electromagnetic valve, the air detector and the nitrogen input device are arranged on the natural gas pipeline to be controlled, and the control system is used for obtaining the relevant information of the air state in the pipeline from the air detector, so that the operation of each electromagnetic valve is controlled, the automatic control functions of the air discharging, the air replacement and the air detection of the pipeline are realized, and the risk of the pipeline ventilation operation is reduced.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and units described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present invention.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The natural gas pipeline gas on-line control device is characterized by comprising an air inlet electromagnetic valve, an air outlet electromagnetic valve, a control system, a gas detector and nitrogen input equipment;
the air inlet electromagnetic valve, the air taking electromagnetic valve and the air discharging electromagnetic valve are respectively arranged at the air inlet, the air taking electromagnetic valve and the air discharging electromagnetic valve of the natural gas pipeline to be controlled;
The nitrogen input equipment is communicated with the natural gas pipeline to be controlled through the air inlet electromagnetic valve, and the control system is electrically connected with the air inlet electromagnetic valve; the gas detector is communicated with the natural gas pipeline to be controlled through the gas taking port electromagnetic valve, and the control system is electrically connected with the gas detector; the control system is also electrically connected with the vent electromagnetic valve;
The control system is used for obtaining a plurality of first pressure values in the natural gas pipeline to be controlled in real time from the gas detector according to the selected emptying mode, and controlling the opening of the emptying port electromagnetic valve according to the plurality of first pressure values;
The control system is further used for obtaining a second pressure value in the natural gas pipeline to be controlled from the gas detector when the selected replacement mode is finished in a preset time period, determining whether the gas in the natural gas pipeline to be controlled is exhausted or not according to the second pressure value, and if so, controlling the electromagnetic valve of the air vent to be closed and controlling the electromagnetic valve of the air inlet to be opened;
The control system is also used for obtaining the nitrogen content parameter in the natural gas pipeline to be controlled from the gas detector in real time according to the selected detection mode, judging whether the detection is qualified according to the nitrogen content parameter, and controlling the closing of the electromagnetic valve of the gas inlet if the detection is qualified.
2. The on-line natural gas pipeline gas control device according to claim 1, wherein in the control system, the opening degree of the vent solenoid valve is controlled according to a plurality of the first pressure values, comprising:
And comparing the first pressure values with a set safety range value respectively, if the first pressure value is larger than the set safety range value, reducing the opening of the vent solenoid valve, if the first pressure value is smaller than the set safety range value, increasing the opening of the vent solenoid valve, and if the first pressure value is equal to the set safety range value, maintaining the current opening of the vent solenoid valve.
3. The on-line natural gas pipeline gas control device according to claim 1, wherein the control system determines whether the gas in the natural gas pipeline to be controlled is exhausted according to the second pressure value, including:
and comparing the second pressure value with an ordinary pressure value, and if the second pressure value is equal to the ordinary pressure value, determining that the gas in the natural gas pipeline to be controlled is exhausted.
4. A natural gas pipeline gas on-line control apparatus as defined in claim 3, wherein the control system determines whether the gas in the natural gas pipeline to be controlled is exhausted according to the second pressure value, and further comprises:
And if the second pressure value is larger or smaller than the normal pressure value, controlling the opening of the vent solenoid valve according to the second pressure value, obtaining a second pressure value in the natural gas pipeline to be controlled from the gas detector when the preset time period is over, and determining whether the gas in the natural gas pipeline to be controlled is exhausted according to the second pressure value, so that the cycle is performed.
5. The on-line control device for natural gas pipeline gas according to claim 1, wherein the control system for judging whether the detection is qualified according to the nitrogen content parameter comprises:
and comparing the nitrogen content parameter with a set nitrogen content standard parameter range, if the nitrogen content parameter is within the set nitrogen content standard parameter range, detecting to be qualified, otherwise, detecting to be unqualified, and continuously opening the air inlet electromagnetic valve.
6. The natural gas pipeline gas on-line control device according to any one of claims 1 to 5, further comprising a flare, wherein the flare is in communication with the natural gas pipeline to be controlled through a flare solenoid valve, and wherein the flare is electrically connected to the gas detector;
the control system is used for starting the emptying torch according to the selected emptying mode.
7. The on-line natural gas pipeline gas control device according to any one of claims 1 to 5, wherein the gas inlet solenoid valve is installed at a gas inlet of an upstream section of the natural gas pipeline to be controlled, the gas outlet solenoid valve is installed at a gas outlet of a downstream section of the natural gas pipeline to be controlled, and the vent solenoid valve is installed at a vent between the upstream section and the downstream section of the natural gas pipeline to be controlled.
8. A natural gas pipeline gas on-line control method, adopting the natural gas pipeline gas on-line control device according to any one of claims 1 to 7, characterized by comprising the steps of:
acquiring a plurality of first pressure values in a natural gas pipeline to be controlled in real time from a gas detector according to the selected emptying mode, and controlling the opening of an emptying port electromagnetic valve according to the plurality of first pressure values;
When the selected replacement mode is over the preset time period, a second pressure value in the natural gas pipeline to be controlled is obtained from the gas detector, whether the gas in the natural gas pipeline to be controlled is exhausted or not is determined according to the second pressure value, if yes, the electromagnetic valve of the air vent is controlled to be closed, and the electromagnetic valve of the air inlet is controlled to be opened;
And acquiring nitrogen content parameters in the natural gas pipeline to be controlled from the gas detector in real time according to the selected detection mode, judging whether the detection is qualified according to the nitrogen content parameters, and if the detection is qualified, controlling the electromagnetic valve of the gas inlet to be closed.
9. The on-line natural gas pipeline gas control method according to claim 8, wherein controlling the opening degree of the vent solenoid valve according to the plurality of first pressure values comprises:
And comparing the first pressure values with a set safety range value respectively, if the first pressure value is larger than the set safety range value, reducing the opening of the vent solenoid valve, if the first pressure value is smaller than the set safety range value, increasing the opening of the vent solenoid valve, and if the first pressure value is equal to the set safety range value, maintaining the current opening of the vent solenoid valve.
10. The method for on-line control of natural gas pipeline gas according to claim 8, wherein determining whether the natural gas pipeline is to be controlled is empty according to the second pressure value comprises:
and comparing the second pressure value with an ordinary pressure value, and if the second pressure value is equal to the ordinary pressure value, determining that the gas in the natural gas pipeline to be controlled is exhausted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410554405.3A CN118375855A (en) | 2024-05-07 | 2024-05-07 | Online control device and method for natural gas pipeline gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410554405.3A CN118375855A (en) | 2024-05-07 | 2024-05-07 | Online control device and method for natural gas pipeline gas |
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| CN118375855A true CN118375855A (en) | 2024-07-23 |
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| CN202410554405.3A Pending CN118375855A (en) | 2024-05-07 | 2024-05-07 | Online control device and method for natural gas pipeline gas |
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