CN114740221A - Method for monitoring flow velocity of medium in gas pipeline through pressure fluctuation analysis - Google Patents
Method for monitoring flow velocity of medium in gas pipeline through pressure fluctuation analysis Download PDFInfo
- Publication number
- CN114740221A CN114740221A CN202210397650.9A CN202210397650A CN114740221A CN 114740221 A CN114740221 A CN 114740221A CN 202210397650 A CN202210397650 A CN 202210397650A CN 114740221 A CN114740221 A CN 114740221A
- Authority
- CN
- China
- Prior art keywords
- section
- medium
- pressure
- flow
- velocity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000002360 explosive Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
- G01P5/245—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by measuring transit time of acoustical waves
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pipeline Systems (AREA)
Abstract
The invention provides a method for monitoring the medium flow velocity in a gas pipeline network through pressure fluctuation analysis. The method solves the technical problems that the user gas consumption condition in the existing urban gas pipe network is variable, the pipe network load condition is extremely complex, the monitoring difficulty is high, and the existing method is difficult to realize safety control. The invention can be widely applied to the safety monitoring of the urban gas pipe network.
Description
Technical Field
The invention relates to a method for monitoring a gas pipe network, in particular to a method for monitoring the flow rate of a medium in the gas pipe network through pressure fluctuation analysis.
Background
Along with the wide popularization and application of gas in recent years, the gas is applied more and more in the life of residents, but because of the flammable and explosive properties of the gas, greater risks exist in the use process, and strict safety control needs to be carried out on the gas. However, the conditions of user gas consumption in the urban gas pipe network are variable, the load condition of the pipe network is extremely complex, the monitoring difficulty is high, and the safety management and control are difficult to realize by the existing method.
Disclosure of Invention
The invention provides a method for monitoring the medium flow rate in a gas pipe network through pressure fluctuation analysis, which can effectively monitor the pressure of a complex urban gas pipe network and ensure the safe operation of gas.
Therefore, the technical scheme of the invention is that the method for monitoring the medium flow velocity in the gas pipeline network through pressure fluctuation analysis, the pressure transmitters are respectively arranged at the two ends of the gas pipeline section, the collected pressure data are uploaded to the cloud end through the pressure transmitters, any data section is obtained, and when the data section has monotonicity, the medium flow velocity in the pipeline section can be determined through the propagation relation, and the specific method comprises the following steps:
(1) according to the formula of sound velocity
Wherein K is an adiabatic index, R is a gas constant, C is a sound velocity, T is a temperature, the length of the pipe section is set to be L, and when a medium does not flow, L/C is the static time difference of the installation points of the two pressure transmitters and is set to be tau;
(2) setting pressure sensors at two ends of a pipe section as A and B respectively, and setting pressure sampling frequency as 200 hz; align the time starting point, set the sequence for point A as
Set the sequence for point B as
Sliding the sequence B, and solving: min
The time difference between the two points AB is t ═ i-j)/200, and the flow rate of the medium in the pipe section is
。
Preferably, when there is a reducing diameter in the measured pipe section, the flow rate of each pipe section is:
the flow velocity of each segment can be found by simultaneous equations, wherein,
is the flow rate of the medium in the first section,
the flow rate of the medium in the second section,
is the flow rate of the medium in the Nth section, R1Is a first section pipe diameter, R2Is a second section of pipe diameter, RNIs the Nth section of pipe diameter.
The invention has the advantages that the pressure transmitters are arranged at the two ends of the pipe section, pressure acquisition is carried out according to certain frequency, a pressure sequence of two points is formed, the time difference of the two points is combined, the medium flow rate in the pipe section at the time period can be calculated, the method is simple, the reliability is high, the realization is easy, and the practicability is strong; when the pipe sections are internally provided with reducing pipes, the flow velocity of each section can be solved through simultaneous equations according to the number of the reducing pipe sections, and a pipe network dynamic monitoring system is established through the wide-area space-time relationship, so that the safety of gas is guaranteed, and the safe operation requirement of the dynamically-changed complex urban gas pipe network is met.
Detailed Description
The present invention will be further described with reference to the following examples.
A method for analyzing and monitoring the medium flow speed in gas pipeline by pressure fluctuation is used in city gas pipeline with changeable gas consumption, the medium pressure in gas pipeline is always in dynamic change due to the change of gas consumption in city gas pipeline, so as to form pressure fluctuation waveform, the pressure propagation speed is sound speed, the pressure fluctuation waveform is propagated according to sound speed, pressure transmitters are respectively arranged at two ends of gas pipeline section, once the pressure transmitters are installed, the time-space relationship is determined. The pressure data that will gather through pressure transmitter upload to the high in the clouds, get arbitrary data segment, as long as this data segment has monotonicity, can confirm the medium velocity of flow in this pipeline section through the propagation relation, specific method is:
(1) according to the formula of sound velocity
K is an adiabatic index, R is a gas constant, C is a sound velocity, T is temperature, the length of a pipe section is set to be L, when a medium is fixed, the adiabatic index K is constant with the gas constant R, the sound velocity C is only related to the temperature, T is a measurable physical quantity, and when the medium does not flow, L/C is the static time difference of the two pressure transmitter mounting points and is set to be tau;
(2) setting pressure sensors at two ends of a pipe section as A and B respectively, and setting pressure sampling frequency as 200 hz; aligning the time starting point, setting the sequence for the A point as
Setting the sequence for the B point as
Sliding the sequence B, and solving:
the time difference between the two points AB is t ═ i-j)/200, and the flow rate of the medium in the pipe section
。
When the measured pipe section has reducing diameters, the flow velocity of each pipe section is as follows:
the flow velocity of each segment can be found by simultaneous equations, wherein,
the flow rate of the medium in the first section of the pipeline,
the flow rate of the medium in the second section of the pipeline,
is the flow rate of the medium in the Nth section of the pipeline, R1Is the pipe diameter of the first section of pipeline, R2Is the pipe diameter of the second section of pipeline, RNIs the pipe diameter of the Nth section of pipeline.
The pressure transmitters are arranged at the two ends of the pipe section, pressure acquisition is carried out according to a certain frequency, a pressure sequence of two points is formed, the medium flow speed in the pipe section at the time period can be calculated by combining the time difference of the two points, and the method is simple, high in reliability, easy to implement and high in implementability; when the pipe sections are internally provided with reducing pipes, the flow velocity of each section can be solved through simultaneous equations according to the number of the reducing pipe sections, and a pipe network dynamic monitoring system is established through the wide-area space-time relationship, so that the safety of gas is guaranteed, and the safe operation requirement of the dynamically-changed complex urban gas pipe network is met.
However, the above description is only exemplary of the present invention, and the scope of the present invention should not be limited thereby, and the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should be covered by the claims of the present invention.
Claims (2)
1. The utility model provides a method of medium velocity of flow in analysis and monitoring gas pipeline through pressure fluctuation, its characterized in that sets up pressure transmitter respectively through the both ends at the gas pipeline section, uploads the high in the clouds through pressure transmitter with the pressure data who gathers, gets arbitrary data section, when this data section has monotonicity, can confirm the medium velocity of flow in this pipeline section through the propagation relation, and concrete method is:
(1) according to the formula of sound velocity
Wherein K is adiabatic index, R is gas constant, C is sound velocity, T is temperature, and the length of the pipe section is LWhen the flow exists, the L/C is the static time difference of the installation points of the two pressure transmitters, and is set as tau;
(2) setting pressure sensors at two ends of a pipe section as A and B respectively, and setting pressure sampling frequency as 200 hz; aligning the time starting point, setting the sequence for the A point as
Set the sequence for point B as
Sliding the sequence B, and solving:
the time difference between the two points AB is t (i-j)/200, and the flow rate of the medium in the pipe section is C (t-tau)/tau.
2. The method for monitoring the flow rate of a medium in a gas pipeline network through pressure fluctuation analysis according to claim 1, wherein when there is a diameter variation in the measured pipeline section, the flow rate of each pipeline section is:
θ1×R1 2＝θ2×R2 2＝......＝θN×RN 2and calculating the flow velocity of each section by a simultaneous equation, wherein theta 1 is the flow velocity of the medium in the first section, theta 2 is the flow velocity of the medium in the second section, theta N is the flow velocity of the medium in the Nth section, and R1Is a first section pipe diameter, R2Is a second section of pipe diameter, RNIs the Nth section of pipe diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210397650.9A CN114740221A (en) | 2022-04-15 | 2022-04-15 | Method for monitoring flow velocity of medium in gas pipeline through pressure fluctuation analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210397650.9A CN114740221A (en) | 2022-04-15 | 2022-04-15 | Method for monitoring flow velocity of medium in gas pipeline through pressure fluctuation analysis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114740221A true CN114740221A (en) | 2022-07-12 |
Family
ID=82280835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210397650.9A Pending CN114740221A (en) | 2022-04-15 | 2022-04-15 | Method for monitoring flow velocity of medium in gas pipeline through pressure fluctuation analysis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114740221A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001330494A (en) * | 2000-05-25 | 2001-11-30 | Matsushita Electric Ind Co Ltd | Gas cutting-off apparatus |
| CN102080767A (en) * | 2009-11-27 | 2011-06-01 | 辽宁石油化工大学 | Method and device for detecting oil mixing interface in sequential oil transportation |
| CN103814277A (en) * | 2011-06-30 | 2014-05-21 | 佩德罗·乔斯·李 | Flow speed determination method and apparatus |
| CN109490573A (en) * | 2018-11-02 | 2019-03-19 | 湖南核三力技术工程有限公司 | The lossless flow-speed measurement method of material and monitoring device based on resistance of pipe system characteristic in pneumatic conveying |
| CN109489742A (en) * | 2018-11-27 | 2019-03-19 | 北京航空航天大学 | Piping flow measuring device and method based on pressure signal |
| CN110566821A (en) * | 2019-09-09 | 2019-12-13 | 山东拙诚智能科技有限公司 | method for realizing downstream pipe network leakage detection by monitoring pressure state of pressure regulating device |
| CN112198333A (en) * | 2020-10-10 | 2021-01-08 | 王开全 | Device for measuring flow velocity of pipeline by pressure intensity time difference and using method |
| CN215112046U (en) * | 2021-02-07 | 2021-12-10 | 东莞市横沥兴华管道燃气有限公司 | Natural gas recovery regulation and control device suitable for urban natural gas pipe network |
| CN113916468A (en) * | 2021-09-29 | 2022-01-11 | 浙江威星智能仪表股份有限公司 | Micro-flow gas leakage detection method based on ultrasonic gas meter |
-
2022
- 2022-04-15 CN CN202210397650.9A patent/CN114740221A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001330494A (en) * | 2000-05-25 | 2001-11-30 | Matsushita Electric Ind Co Ltd | Gas cutting-off apparatus |
| CN102080767A (en) * | 2009-11-27 | 2011-06-01 | 辽宁石油化工大学 | Method and device for detecting oil mixing interface in sequential oil transportation |
| CN103814277A (en) * | 2011-06-30 | 2014-05-21 | 佩德罗·乔斯·李 | Flow speed determination method and apparatus |
| CN109490573A (en) * | 2018-11-02 | 2019-03-19 | 湖南核三力技术工程有限公司 | The lossless flow-speed measurement method of material and monitoring device based on resistance of pipe system characteristic in pneumatic conveying |
| CN109489742A (en) * | 2018-11-27 | 2019-03-19 | 北京航空航天大学 | Piping flow measuring device and method based on pressure signal |
| CN110566821A (en) * | 2019-09-09 | 2019-12-13 | 山东拙诚智能科技有限公司 | method for realizing downstream pipe network leakage detection by monitoring pressure state of pressure regulating device |
| CN112198333A (en) * | 2020-10-10 | 2021-01-08 | 王开全 | Device for measuring flow velocity of pipeline by pressure intensity time difference and using method |
| CN215112046U (en) * | 2021-02-07 | 2021-12-10 | 东莞市横沥兴华管道燃气有限公司 | Natural gas recovery regulation and control device suitable for urban natural gas pipe network |
| CN113916468A (en) * | 2021-09-29 | 2022-01-11 | 浙江威星智能仪表股份有限公司 | Micro-flow gas leakage detection method based on ultrasonic gas meter |
Non-Patent Citations (2)
| Title |
|---|
| 陈家琅: "高等学校教学用书 石油气液两相管流", 31 August 1989, 石油工业出版社 , pages: 6 * |
| 黄世桥: "化工用离心泵", 31 May 1982, 化学工业出版社, pages: 2 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107940246B (en) | A kind of fluid line source of leaks monitoring and positioning system and method | |
| CN103266906B (en) | Method for verifying state of mine ventilation system by self-adjusting tunnel wind resistance parameters | |
| CN103591463B (en) | The accurate positioning and monitoring method of buried carried of crude oil pipeline minute leakage and device | |
| CN112377820B (en) | Method for positioning gas leakage point according to negative pressure wave slope change | |
| CN105042339A (en) | Leakage rate estimation system and method for product oil pipelines based on zero dimension | |
| CN108197070A (en) | Natural gas not exclusively blocks pipeline method for numerical simulation | |
| CN110566821B (en) | Method for realizing downstream pipe network leakage detection by monitoring pressure state of pressure regulating device | |
| CN103822098A (en) | Method for monitoring water supply network leakage | |
| CN103592904A (en) | Remote monitoring system for electric power tunnel | |
| CN114740221A (en) | Method for monitoring flow velocity of medium in gas pipeline through pressure fluctuation analysis | |
| CN104422483A (en) | Remote network type flow rate metering system of natural gas gate station | |
| CN204330532U (en) | A kind of three pipe series parallel type plastic fluid funnel viscosity on-line measurement devices | |
| CN202580643U (en) | Safety online management system for pipelines | |
| CN103939746A (en) | Well mouth prizer and integrated device including well mouth prizer | |
| CN203414801U (en) | High dam deep anti-slip stability evaluation system | |
| CN104568026A (en) | Final-stage channel flow measuring method and device | |
| CN204630622U (en) | A kind of critical speed flowmeters amount system | |
| CN208474956U (en) | Heat supply pipeline leak detection system based on infrasound and reference point | |
| CN104422482A (en) | Multi-channel intelligent metering system of urban gas network | |
| CN204327074U (en) | Shale gas ground open flow safety monitoring assembly | |
| CN104422487A (en) | Multichannel integrated flow meter for natural gas gate station | |
| CN111537179B (en) | Small-size wind tunnel-based screen window small micro-pressure drop testing device | |
| CN204902902U (en) | Low velocity of flow to high flow rate wide range clings to flowmeter than pitot | |
| CN201225146Y (en) | Downhole oil, water, gas mixing phase flow measuring device | |
| CN113669629A (en) | Pipeline operation monitoring system and complex pipeline flow measurement method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |