CN110425429A - A kind of real-time monitoring regulator valve port state and the method that downstream flow is estimated - Google Patents
A kind of real-time monitoring regulator valve port state and the method that downstream flow is estimated Download PDFInfo
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- CN110425429A CN110425429A CN201910857617.8A CN201910857617A CN110425429A CN 110425429 A CN110425429 A CN 110425429A CN 201910857617 A CN201910857617 A CN 201910857617A CN 110425429 A CN110425429 A CN 110425429A
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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
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
-
- 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
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
Abstract
A kind of method that the present invention provides real-time monitoring regulator valve port state and estimated downstream flow, specific steps are as follows: pressure value on acquisition gas pipeline, judged according to valve port state of the pressure signal sampled value to regulator, further calculates pipe downstream flow and conversion calculates the flow velocity of upstream.Which solve existing gas ductwork leakage monitoring method due to interference signal there is technical issues that cause monitoring efficiency it is low,.It the composite can be widely applied in the leakage monitoring of gas pipeline.
Description
Technical field
The present invention relates to pipe network monitoring technical field, specially a kind of real-time monitoring regulator valve port state and to downstream
The method that flow is estimated.
Background technique
With the rapid development of society, natural gas is as a kind of efficient, clean energy, is the after coal, petroleum
Three big natural energy sources, have entered the every field in life, and natural gas needs after multi-stage pressure regulating, could make for user
With.Gas pressure regulating valve is the main voltage regulation part in natural gas transmission pipeline, it by changing the combustion gas stream through regulating valve automatically
Amount makes outlet gas keep authorized pressure, is generally divided into direct acting type and two kinds of indirect acting type, pressure regulator valve is fuel gas pipeline
On a kind of Special valve, no matter gas flow and upstream pressure how to change, the device that downstream pressure can be kept stable.
Pressure regulator valve valve port is mesolow connecting points, combustion gas stream to herein when, can because pressure and caliber variation, flow shape
State can change, and especially gas pressure regulating valve valve port unlatching moment can generate the pressure jump of similar suction wave, and valve port is opened
A large amount of Low-frequency continuous sound wave can be also generated afterwards, and in gas ductwork leakage monitoring research process, these problems are often by people
Ignore.
Summary of the invention
The present invention against the above technical problems, provides one kind and determines whether leakage by being monitored to valve port state simultaneously
What is estimated to leakage rate real-time monitoring regulator valve port state and the method estimated downstream flow.
For this purpose, the technical scheme is that, a kind of fuel gas pipeline leakage monitoring system is equipped with regulator, the tune
Pressure device is mounted on gas pipeline, and regulator rear and front end is equipped with signal pickup assembly, and the signal pickup assembly is used
Signal in acquisition regulator rear and front end is uploaded to backstage, is equipped with time service device in the signal pickup assembly.
Preferably, the signal pickup assembly uses pressure transmitter, and the regulator front end becomes equipped with forefront pressure
Device is sent, the regulator rear end is equipped with rear end pressure transmitter, and the forefront pressure transmitter and rear end pressure transmitter are equal
It is mounted on regulator valve port two sides.
Preferably, the signal pickup assembly uses pressure transmitter, and the regulator front end becomes equipped with forefront pressure
Device is sent, the regulator rear end is equipped with rear end pressure transmitter, and the forefront pressure transmitter and rear end pressure transmitter are equal
In the pipeline for installing regulator front and back end.
Preferably, the signal pickup assembly uses sound collecting device or acceleration transducer.
A kind of method of real-time monitoring regulator valve port state, by being adopted to signal pickup assembly in same time window
The signal of collection is analyzed, and determines that regulator valve port is in unlatching or closed state.
Preferably, what the signal acquired to signal pickup assembly in same time window was analyzed method particularly includes:
(1) time service device gives signal pickup assembly time service, and signal pickup assembly acquires the signal of regulator rear and front end
Upload to backstage；
(2) it combines the time of its acquisition to analyze signal from the background, the valve port state of regulator is judged.
Preferably, judged according to valve port state of the pressure signal sampled value to regulator, judgment step are as follows:
A. the pressure waveform for taking regulator front and back end pressure transmitter same time window respectively carries out difference to two sections of waveforms
Value filtering, obtaining front end waveform is Xm(t), obtaining rear end waveform is Xn(t)；
B. X is takenm(t) and Xn(t) same time point corresponding pressure value (t1, P11)、(t1, P21)………(tn, P1n)、
(tn, P2n), find out △ p1=∣ P11-P21∣……..△pn=∣ P1n-P2n∣；
C. the relation curve S of settling time t and △ p△P(t), according to sensor resolving accuracy with it is empirically determined, if should
Curve is between two parallel lines, then illustrates regulator front end waveform Xm(t) with regulator rear end waveform Xn(t) approximate
It is similar, determine that the valve port of regulator is in the open state；
D. if the amplitude range of the curve has exceeded the limitation range of two parallel lines, illustrate regulator front end wave
Shape Xm(t) with regulator rear end waveform Xn(t) inconsistent, tentatively judge that valve port is in close state, it is included with the regulator
Equation of equilibrium further confirmation is made to valve port state.
Preferably, judge the approximate method of relation curve of t Yu △ p are as follows:
Curve S△P(t) △ p is the difference of the force samples value of front and back end pressure transmitter same time, the width of the value in
The resolving accuracy of degree and pressure transmitter has much relations, outputs and inputs range and pressure according to regulator front and back end pressure
The resolving accuracy of power transmitter can set a threshold value, set two parallel lines, curve S with the threshold value△P(t) two are in put down
Between line, then illustrate Xm(t) and Xn(t) approximate similar, it is on the contrary then illustrate Xm(t) and Xn(t) inconsistent.
A method of downstream flow is estimated by real-time monitoring regulator valve port state, which is characterized in that
According to regulator pressure flow curve, since the breathing area in valve opening state lower valve port is uniquely determined by low-pressure area pressure,
Downstream flow estimates formula are as follows:
Wherein:
qIt is practicalFor the actual flow of downstream line；
qMarkFor the flow read on pressure flow curve in the case where monitoring pressure；
p2For downstream line pressure；
p1 is practicalFor the actual pressure of upstream line；
p1 markThe upstream pressure set when equipment calibration.
Preferably, the downstream flow occurred in real time is converted to the flow velocity of upstream according to mass conservation law:
ρ1*△Q1=ρ2*△Q2
△Q1=υ1*S
In the case where environment temperature is certain, pressure and density are proportional, then have:
Wherein:
υ1Flow velocity is increased newly for upstream；
ρ1For inlet end Media density；
ρ2For outlet side Media density；
△Q2For the new flow increasing in downstream；
△Q1For the new flow increasing in downstream；
S is upstream line sectional area；
P1For the absolute pressure value of upstream；
P2For the absolute pressure value in downstream.
The medicine have the advantages that
(1) pass through the monitoring of regulator valve port state, had for suction wave in gas ductwork with acoustic signals are continued
Source signal confirmation provides condition, further improves the efficiency and accuracy of leakage monitoring；
(2) after valve port is opened, the flow velocity and flow of outlet side under free position can be calculated using pressure flow curve,
Foundation is provided for the monitoring of downstream gas flow, can also be estimated for upstream gas leakage amount and foundation is provided, not increase equipment cost
In the case where, realize the monitoring to flow in pipeline.
Detailed description of the invention
Fig. 1 is pressure regulator valve structural schematic diagram；
Fig. 2 is the interior setting force samples schematic device of lumen before and after pressure regulator valve of the present invention；
Fig. 3 is pressure regulator valve valve port status monitoring flow chart of the present invention；
Fig. 4 is epithelium and valve port stress diagram inside positive interaction type pressure regulator valve；
Fig. 5 is epithelium and valve port stress diagram inside reaction-type pressure regulator valve；
Fig. 6 is pressure regulator valve nominal pressure flow curve figure.
Symbol description in figure:
1. spring；2. epithelium；3. valve port；4. forefront pressure transmitter；5. rear end pressure transmitter；6. calculator.
Specific embodiment
The present invention is described further below with reference to embodiment.
Regulator in the present embodiment is pressure regulator valve, still, other any to play the role of same or like device
It all belongs to the scope of protection of the present invention.
It, can be by installing pressure transmitter or sound collecting device either in pressure regulator valve upstream and downstream in gas pipeline
Acceleration transducer etc. to judge valve port state, and then makes other judgements.
As shown in Figs. 1-2, gas pipeline upstream and downstream is equipped with pressure regulator valve, is equipped with spring 1, epithelium 2, valve port 3 in pressure regulator valve,
Front end is equipped with pressure transmitter 4 and rear end is equipped with pressure transmitter 5, and forefront pressure transmitter 4 and rear end pressure transmitter 5 connect
It is connected on calculator 6, calculator 6 is additionally provided with GPS time service device.
As shown in figure 3, a kind of method of real-time monitoring pressure regulator valve valve port state, method particularly includes:
(1) precision time service is carried out to calculator with GPS time service device；
(2) the upstream and downstream pressure of gas ductwork is distinguished by pressure regulator valve forefront pressure transmitter and rear end pressure transmitter
Signal carries out real-time sampling；
(3) judged according to valve port state of the pressure signal sampled value to pressure regulator valve, judgment step are as follows:
A. the pressure waveform for taking pressure regulator valve front and back end pressure transmitter same time window respectively carries out difference to two sections of waveforms
Filtering, obtaining front end waveform is Xm(t), obtaining rear end waveform is Xn(t)；
Differential filtering algorithm: sampling adjacent twice is subtracted each other, and finds out its increment, then using the absolute value of increment as this
The sample of data.
B. X is takenm(t) and Xn(t) same time point corresponding pressure value (t1, P11)、(t1, P21)......(tn, P1n)、
(tn, P2n), find out △ p1=∣ P11-P21∣……△pn=∣ P1n-P2n∣；
C. the relation curve S of settling time t and △ p△P(t), if the curve is between two parallel lines, illustrate
Pressure regulator valve front end waveform Xm(t) with pressure regulator valve rear end waveform Xn(t) approximate similar, determine that the valve port of pressure regulator valve is in the open state；
D. if the amplitude range of the curve has exceeded the limitation range of two parallel lines, illustrate pressure regulator valve front end waveform
Xm(t) with pressure regulator valve rear end waveform Xn(t) inconsistent, tentatively judge that valve port is in close state, the balance carried with the pressure regulator valve
Formula makes confirmation to valve port state.
Judge the approximate method of relation curve of t Yu △ p are as follows:
Method 1: curve S△P(t) △ p is the difference of the force samples value of front and back end pressure transmitter same time in, should
The amplitude of value and the resolving accuracy of pressure transmitter have much relations, output and input range according to pressure regulator valve front and back end pressure
With the resolving accuracy of pressure transmitter, a threshold value can be set, two parallel lines, curve S are set with the threshold value△P(t) it is in two
Between parallel lines, then illustrate Xm(t) and Xn(t) approximate similar, it is on the contrary then illustrate Xm(t) and Xn(t) inconsistent.
Method 2: can also be by curve S△P(t) two sum for seeking absolute value after adjacent spots are subtracted each other twice, then the result that will be asked
It is averaged, by judging whether the average value meets given threshold, if met, illustrates curve S△PIt (t) is approximate phase
Seemingly.
Summation: ∑=∣ △ P2-△P1∣+∣△P2-△P3∣……..+∣△Pn-△Pn-1∣ averages:
Wherein:
∑ is the sum of adjacent spots absolute difference；
△PnFor curve S△P(t) sampling point；
N is the number of sample in sampling time window.
Method 3: cross-correlation equation can also be used to pressure regulator valve front end waveform for XmIt (t) is X with pressure regulator valve rear end waveformn
(t) consistency analysis is carried out, formula is as follows:
The datacycle two o'clock of 1, same time point is parsed by cross-correlation equation, calculates cross-correlation coefficient R
(τ) value illustrates that the valve port of pressure regulator valve is in the open state if group number of R (τ) value higher than 0.5 is greater than given threshold.
If the above method judges pressure regulator valve front end waveform Xm(t) with pressure regulator valve rear end waveform Xn(t) inconsistent, tentatively sentence
Disconnected valve port is in close state, and makes further confirmation to valve port state with the equation of equilibrium that the pressure regulator valve carries.
As illustrated in figures 4-5, pressure regulator valve can be divided into direct acting type and indirect acting type, and direct acting type is divided into positive interaction type
With negative interaction formula, for pressure regulator valve valve port, stress balance formula are as follows:
Negative interaction formula: F+P1* s=P2*S+P2* s,
Positive interaction type: F+P2* s=P2*S+P1* s,
As F+P1*s >=P2*S+P2*s or F+P2*s≥P2*S+P1* when s, valve port is in close state；
Wherein: F is pressure regulator valve spring pressure；P1 is pressure regulator valve inlet pressure；S is valve port sectional area, and S is pressure regulator valve epithelium
Sectional area；P2 is pressure regulation valve outlet pressure.
Pressure regulator valve has oneself a pressure flow curve such as Fig. 6, according to pressure regulator valve pressure flow curve, due to opening
The breathing area of valve state lower valve port is uniquely determined by low-pressure area pressure, according to curve, can be calculated and be taken the post as by ratiometric conversion
The flow velocity Yu flow (orifice flowmeter principle) of outlet side under meaning state, within the scope of optimum flow, downstream flow estimates formula
Are as follows:
Wherein:
qIt is practicalFor the actual flow of downstream line；
qMarkFor the flow read on pressure flow curve in the case where monitoring pressure；
p2For downstream line pressure；
p1 is practicalFor the actual pressure of upstream line；
p1 markThe upstream pressure set when equipment calibration.
The downstream flow △ Q that will be occurred in real time according to mass conservation law2Be converted to the flow velocity υ of upstream1:
ρ1*△Q1=ρ2*△Q2 (4)
△Q1=υ1*S (5)
In the case where environment temperature is certain, pressure and density are proportional, can be obtained by formula (4) (5) (6):
Wherein:
υ1Flow velocity is increased newly for upstream；
ρ1For inlet end Media density；
ρ2For outlet side Media density；
△Q2For the new flow increasing in downstream；
△Q1For the new flow increasing in downstream；
S is upstream line sectional area.
When simultaneously suction wave occurs for upstream and downstream, amplitude and the instant flow calculated of suction wave, upload to together
From the background, by establishing upstream pressure~negative pressure wave amplitude~current curve from the background, upstream line can be occurred using the curve
Leakage rate estimated.
Due to sound wave and acceleration acquire be all time and voltage value curve, it is similar with pressure signal, to curve
Processing method is the same, the time for the pressure regulator valve front and back end acoustic signals that sound collecting device is acquired and voltage value characteristic curve, or
The time of the pressure regulator valve front and back end vibration signal of person's acceleration transducer acquisition and voltage value waveform, use and signal pickup assembly
Identical signal processing method when using pressure transmitter is, it can be achieved that judgement to pressure regulator valve valve port state.
The present invention is that suction wave and lasting acoustic signals carry out in gas ductwork by the monitoring to pressure regulator valve valve port state
Blind source separating provides condition, further improves the efficiency and accuracy of leakage monitoring；After valve port is opened, pressure is utilized
Flow curve can calculate the flow velocity and flow of outlet side under free position, provide foundation for the monitoring of downstream gas flow,
Foundation can be provided for the estimation of upstream gas leakage amount, in the case where not increasing equipment cost, realized to flow in pipeline
Monitoring.
Only as described above, only specific embodiments of the present invention, when the model that cannot be limited the present invention with this and implement
It encloses, thus the displacement of its equivalent assemblies, such as pressure transmitter is substituted with sound pick-up, pressure transmitter is substituted with acceleration transducer
Deng, or according to equivalent changes and modifications made by the invention patent protection scope, should still belong to claims of the present invention and cover it
Scope.
Claims (10)
1. a kind of fuel gas pipeline leakage monitors system, it is equipped with regulator, which is characterized in that be additionally provided with control device, the tune
Pressure device rear and front end is equipped with signal pickup assembly, and the signal pickup assembly is for acquiring the regulator rear and front end
Signal and be uploaded to control device, in the signal pickup assembly be equipped with time service device.
2. fuel gas pipeline leakage according to claim 1 monitors system, which is characterized in that the signal pickup assembly uses
Pressure transmitter, the regulator front end are equipped with forefront pressure transmitter, and the regulator rear end becomes equipped with rear end pressure
Device is sent, the forefront pressure transmitter and rear end pressure transmitter are installed in regulator valve port two sides.
3. fuel gas pipeline leakage according to claim 1 monitors system, which is characterized in that the signal pickup assembly uses
Pressure transmitter, the regulator front end are equipped with forefront pressure transmitter, and the regulator rear end becomes equipped with rear end pressure
Device is sent, the forefront pressure transmitter and rear end pressure transmitter are respectively mounted in the pipeline of regulator front and back end.
4. fuel gas pipeline leakage according to claim 1 monitors system, which is characterized in that the signal pickup assembly uses
Sound collecting device or acceleration transducer.
5. a kind of method using the real-time monitoring regulator valve port state of any system in claim 1-4, feature exist
In, by same time window signal pickup assembly acquire signal analyze, determine at the regulator valve port
In unlatching or closed state.
6. the method for real-time monitoring regulator valve port state according to claim 5, which is characterized in that the same time
The signal of the signal pickup assembly acquisition is analyzed in window method particularly includes:
(1) before the time service device gives the signal pickup assembly time service, the signal pickup assembly to acquire the regulator
The signal at both ends uploads to the control device afterwards；
(2) signal is combined time of its acquisition to analyze by the control device, to the valve port state of the regulator into
Row judgement.
7. the method for real-time monitoring regulator valve port state according to claim 6, which is characterized in that believed according to pressure
Number sampled value judges the valve port state of the regulator, judgment step are as follows:
A. the pressure waveform for taking regulator front and back end pressure transmitter same time window respectively carries out difference filter to two sections of waveforms
Wave, obtaining front end waveform is Xm(t), obtaining rear end waveform is Xn(t)；
B. X is takenm(t) and Xn(t) same time point corresponding pressure value (t1, P11)、(t1, P21).........(tn, P1n)、(tn,
P2n), find out △ p1=∣ P11-P21∣........△pn=∣ P1n-P2n∣；
C. the relation curve S of settling time t and △ p△P(t), it is determined according to sensor resolving accuracy, if the curve is in two
Between parallel lines, then illustrate regulator front end waveform Xm(t) with regulator rear end waveform Xn(t) approximate similar, determine pressure regulation
The valve port of device is in the open state；
D. if the amplitude range of the curve has exceeded the limitation range of two parallel lines, illustrate regulator front end waveform Xm
(t) with regulator rear end waveform Xn(t) inconsistent, tentatively judge that valve port is in close state, is carried with the regulator
Equation of equilibrium makes further confirmation to valve port state.
8. the method for real-time monitoring regulator valve port state according to claim 7, which is characterized in that judge t and △ p
The approximate method of relation curve are as follows:
Curve S△P(t) △ p is the difference of the force samples value of front and back end pressure transmitter same time, the amplitude and pressure of the value in
The resolving accuracy of power transmitter has relationship, outputs and inputs range and pressure transmitter according to end pressure before and after regulator
Resolving accuracy can set a threshold value, set two parallel lines, curve S with the threshold value△P(t) it is between two parallel lines,
Then illustrate Xm(t) and Xn(t) approximate similar, it is on the contrary then illustrate Xm(t) and Xn(t) inconsistent.
9. a kind of method estimated by real-time monitoring regulator valve port state downstream flow, which is characterized in that root
According to regulator pressure flow curve, since the breathing area in valve opening state lower valve port is uniquely determined by low-pressure area pressure, under
Swim flow estimation formula are as follows:
Wherein:
qIt is practicalFor the actual flow of downstream line；
qMarkFor the flow read on pressure flow curve in the case where monitoring pressure；
p2For downstream line pressure；
p1 is practicalFor the actual pressure of upstream line；
p1 markThe upstream pressure set when equipment calibration.
10. the side according to claim 9 estimated by real-time monitoring regulator valve port state downstream flow
Method, which is characterized in that the downstream flow occurred in real time is converted to the flow velocity of upstream according to mass conservation law:
ρ1*△Q1=ρ2*△Q2
△Q1=υ1*S
In the case where environment temperature is certain, pressure and density are proportional, then have:
Wherein:
υ1Flow velocity is increased newly for upstream；
ρ1For inlet end Media density；
ρ2For outlet side Media density；
△Q2For the new flow increasing in downstream；
△Q1For the new flow increasing in downstream；
S is upstream line sectional area；
P1For the absolute pressure value of upstream；
P2For the absolute pressure value in downstream.
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| CN112377819A (en) * | 2020-11-17 | 2021-02-19 | 张峰 | Metering method for valve orifice gas amount of pressure regulating valve |
| CN112503240A (en) * | 2020-11-23 | 2021-03-16 | 中国华能集团清洁能源技术研究院有限公司 | System and method for regulating valve sound wave monitoring flow |
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