CN109282965A - It is a kind of to collect the quick identification device of nocuousness flow pattern and method in defeated standpipe - Google Patents
It is a kind of to collect the quick identification device of nocuousness flow pattern and method in defeated standpipe Download PDFInfo
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Abstract
The present invention relates to a kind of quick identification device of flow pattern harmful in defeated standpipe of collection and methods, characterized by the following steps: 1) defeated above one end of the standpipe water surface will be collected and is fixedly connected with vertical pipe one end, the vertical pipe other end connects horizontal pipe one end by elbow, and the horizontal pipe other end is fixedly connected with gas-liquid separator；2) resistance element is respectively set on vertical pipe and horizontal pipe；3) pressure difference signal of pipeline at two resistance elements is acquired respectively；4) mean value and standard deviation of pipeline pressure difference signal at two resistance elements are calculated；5) the power spectrum dominant frequency of pipeline pressure difference signal at two resistance elements is calculated separately；6) identification collects whether defeated standpipe is harmful flow pattern, when collecting defeated standpipe is harmful flow pattern, enters step 7)；When collecting defeated standpipe is not harmful flow pattern, output collects the Flow Regime Ecognition result of defeated standpipe；7) identification collects the type of defeated standpipe nocuousness flow pattern, and the present invention can be widely applied in petroleum works multiphase flow detection field.
Description
Technical field
The present invention relates to a kind of quick identification device of flow pattern harmful in defeated standpipe of collection and methods, belong to petroleum works multiphase
Flow detection field.
Background technique
In offshore and gas development, since seabed gas-liquid separation mode is still not mature enough, the products such as oil gas of seabed extraction
Sea production platform still usually is lifted in such a way that mixing transports, wherein is detached from and sea bed contact position to sea from seabed
Pipeline section be known as collecting defeated standpipe.Since a platform usually collects the output object of more mouthfuls of oil wells, thus extremely from the defeated riser bottom of collection
There are certain lengths along the pipeline section of submarine laying between well head.When gas-liquid flow is lower, collects and easily form long liquid plug in defeated standpipe, with
Gas phase alternately flows out, and causes the big ups and downs of rate of discharge, such flow pattern is known as serious slug flow.In addition, if submarine pipeline compared with
Slightly, due to gas-liquid interphase interaction in certain gas-liquid range of flow, longer hydrodynamic force section is easily formed in submarine pipeline
Plug, also results in the fluctuation of pipe outlet flow.Being seriously endangered using serious slug flow as harmful flow pattern of representative influences production
Safety, influence production efficiency can also be embodied as pressure big ups and downs and pipeline vibration, gas-liquid separation in addition to yield big ups and downs
Device cutout or overflow, aggravation corrosive pipeline and wax deposition etc..
On marine oil and gas platform, to avoid such harmful flow pattern from causing damages upstream device, using slug catcher
It captures from the liquid plug for collecting defeated standpipe, makes the gas-liquid flow into gas-liquid separator more uniform by this buffer structure.
In general, the volume of slug catcher is designed according to 3~5 times of liquid of liquid plug extreme length；In addition, also suitably increasing gas-liquid separator
Volume, to enhance its ability to bear to flowed fluctuation.For the ocean platform of an inch of land is an inch of gold, either slug is trapped
Device or gas-liquid separator, excessive volume can impact the arrangement of equipment other on platform, and increase flat top.Such as
Fruit can monitor the generation of harmful flow pattern in time, and then carry out active control to the flowing in pipeline to suppress or eliminate this rapidly
Class flow pattern, or adjust the entrance valve of gas-liquid separator and slug catcher in time, utilize its inner space to a greater degree
Buffered control is carried out, then the nargin of flowing safety guarantee can be improved, reduces the volume of slug catcher and gas-liquid separator, release
Platform space and load.
The key that flow pattern quickly identifies is the signal acquisition time.Prior art discloses flow pattern in a kind of defeated standpipe of collection is fast
Fast identifying system (can be characterized, frictional resistance pressure difference letter by liquid phase distribution at least three different location by vertical section pressure difference signal
It is number negligible relative to weight position pressure difference signal) coupled relation realize the quick identification of harmful flow pattern.However, the system needs
Carry out subaqueous survey；For being completed for platform, subsea construction technical difficulty needed for carrying out corresponding transformation is big, duration phase
To longer, influenced caused by production bigger；The working environment of underwater sensor itself is also more severe, and subsea cryogenic environment
Easily cause impulse pipe choking.The prior art also discloses a kind of flow type identification method based on the defeated riser top pressure signal of collection, should
Method is not necessarily to underwater signal and retrofit work amount very little, is easy to implement on being completed platform；But to collect defeated riser top pressure
Force signal identified, needs to acquire longer time, desired signal length be aforementioned system for rapidly identifying 5~15 times (with
The flow pattern species number of identification is related), it can not achieve quick identification.
Summary of the invention
Harmful flow pattern and difficulty of construction are quickly identified in view of the above-mentioned problems, can be realized the object of the present invention is to provide one kind
The quick identification device of nocuousness flow pattern and method in the defeated standpipe of small collection.
To achieve the above object, the present invention takes following technical scheme: harmful flow pattern quickly identifies in a kind of defeated standpipe of collection
Device, which is characterized in that the device includes: a vertical-horizontal bend part, and the vertical-horizontal bend part is by vertical tube
The bottom of the inverted L shape structure that road, elbow and horizontal pipe are connected in sequence, the vertical pipe collects defeated standpipe for connecting,
The outer end of the horizontal pipe is for connecting gas-liquid separator；Two resistance elements, each resistance element are arranged at institute
It states on vertical pipe and horizontal pipe；Two pressure difference signal sensors, each pressure difference signal sensor are used to acquire in real time
The pressure difference signal of pipeline at the corresponding resistance element；Computer, the computer is according to each pressure difference signal sensor
The pressure difference signal acquired in real time, for identification flow pattern of the defeated standpipe of the collection.
Preferably, each resistance element is all made of flange pair or valve.
Preferably, the outer end of the horizontal pipe passes through pipeline or the vertical downcomer tube road connection gas-liquid separation of having a down dip
Device.
Preferably, flow pattern detection system is provided in the computer, the flow pattern detection system includes flow pattern setting mould
Block and Flow Regime Ecognition module；The flow pattern setting module is for presetting all flow pattern types for collecting defeated standpipe；The flow pattern
Identification module is used to use support vector machines or neural network, according to the preset flow pattern type of the flow pattern setting module, each
The mean value and standard deviation of pressure difference signal, identification collect whether defeated standpipe is harmful flow pattern；When recognition result is harmful flow pattern, according to
Mean value, standard deviation and the power spectrum dominant frequency of the preset flow pattern type of flow pattern setting module and each pressure difference signal, identification
Collect the type of defeated standpipe nocuousness flow pattern.
Preferably, the total length of the vertical pipe is greater than or equal to the internal diameter of 15 times of vertical pipes.
Preferably, two pressure tappings of the pressure difference signal sensor are located at the vertical pipe tube wall on the vertical pipe
Any one bus on, on the vertical pipe pressure length of the pressure difference signal sensor be greater than or equal to 15 times described in
The internal diameter of vertical pipe；Two pressure tappings of the pressure difference signal sensor are located at the corresponding resistance element on the horizontal pipe
The radial lowest point of the horizontal pipe of upstream and downstream.
Preferably, between the vertical pipe, elbow and horizontal pipe, the vertical pipe and the defeated standpipe of the collection it
Between and the horizontal pipe and the gas-liquid separator between be all made of welding or flanged joint.
Preferably, the internal diameter of the vertical pipe, elbow and horizontal pipe is identical, and the total length of the vertical pipe is equal to
35 times of internal diameters, the total length of the horizontal pipe are equal to 8 times of internal diameters, at the top of the vertical pipe with the corresponding resistance element it
Between distance be equal to 26 times of internal diameters, the pressure length of the pressure difference signal sensor is equal to 15 times of internal diameters on the vertical pipe,
The distance between the resistance element and the elbow are equal to 3 times of internal diameters on the horizontal pipe, described on the horizontal pipe
The pressure length of pressure difference signal sensor is equal to 5 times of internal diameters, and the radius of curvature of the elbow is equal to 6 times of internal diameters.
It is a kind of to collect harmful flow pattern method for quickly identifying in defeated standpipe, which comprises the following steps: 1) will to collect defeated vertical
The one end more than pipe water surface is fixedly connected with one end of vertical pipe, and the other end of vertical pipe connects horizontal pipe by elbow
One end, and the other end of horizontal pipe is fixedly connected with gas-liquid separator；2) it is respectively set on vertical pipe and horizontal pipe
Resistance element；3) pressure difference signal of pipeline at two resistance elements is acquired by pressure difference signal sensor respectively；4) to two resistance components
The pressure difference signal of pipeline carries out nondimensionalization processing respectively at part, obtains the mean value and mark of pipeline pressure difference signal at two resistance elements
It is quasi- poor；5) the power spectrum dominant frequency of pipeline pressure difference signal at two resistance elements is calculated separately；6) according to preset all flow patterns
The mean value and standard deviation of pipeline pressure difference signal at type and two resistance elements, identification collect whether defeated standpipe is harmful flow pattern, when
When to collect defeated standpipe be harmful flow pattern, enter step 7)；When collecting defeated standpipe is not harmful flow pattern, the flow pattern that output collects defeated standpipe is known
Other result；7) according to mean value, standard deviation and the function of pipeline pressure difference signal at preset flow pattern type and two resistance elements
Rate composes dominant frequency, and identification collects the type of defeated standpipe nocuousness flow pattern.
The invention adopts the above technical scheme, which has the following advantages: 1, the present invention is due in vertical-horizontal elbow
Resistance element is set on component, and by the local resistance that resistance element generates, pressure needed for shortening pressure difference signal measurement is long
Degree, makes that signal acquisition is more compact, can be completely disposed on the production of hydrocarbons platform of the water surface, and the flow area shape of pipeline and big
It is small still to remain unchanged, it not only avoids underwater construction, greatly reduce the difficulty of construction of pipeline modification, and more easily pressure difference passes
The installation of sensor, so that the working environment of differential pressure pickup is improved, the shortening of differential pressure pickup pressure length is also reduced
The difference in length of two pressure guiding pipes of pressure difference signal sensor, reduces the shadow that pressure-wave emission measures pressure difference signal in pressure guiding pipe
It rings.2, the flow pattern that is identified of computer is different from the localized flow patterns basic kind in simply pipeline in the present invention, such as bubble flow,
Slug flow, stratified flow, annular flow etc., but a certain structural pipeline change with time along journey distribution of each phase it is whole representated by rule
Body flow pattern type.Mass flow pattern includes two layers of meaning: a certain instantaneous pipeline is distributed along the localized flow patterns of journey, a certain position local flow
Type changes with time situation, and differential pressure pickup pressure difference signal collected can not only reflect that local phase distribution is believed in the present invention
Breath, and flow rate information is also reflected by local flow resistance, it is achieved in and realizes that flow pattern is quick using less differential pressure pickup
The purpose of identification, the difficulty implemented on operation marine oil gas field significantly reduce, and influence of the pipeline modification process to production is more
It is small, and since whole device is more compact, maintenance is more convenient, and functional reliability is also higher, can be widely applied to sea
In oil gas field.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of quickly identification device of the invention；
Fig. 2 is the partial structure diagram of quickly identification device of the invention；
Fig. 3 is the schematic diagram of several harmful flow patterns, wherein Fig. 3 (a) is first kind serious slug flow, and Fig. 3 (b) is second
Class serious slug flow, Fig. 3 (c) are third class serious slug flow, and Fig. 3 (d) is concussion flow pattern, and Fig. 3 (e) is that irregular second class is tight
Weight slug flow, Fig. 3 (f) are irregular concussion flow pattern；
Fig. 4 is using the Flow Regime Ecognition accuracy curve under pressure difference signal length different after the present invention quickly identification device
Figure, wherein Fig. 4 (a) is the recognition correct rate song that flow pattern is divided into each flow pattern in the case of Stable Manifold and harmful flow pattern two major classes
Line chart, Fig. 4 (b) are the recognition correct rate of each flow pattern in the case of harmful flow pattern to be subdivided into typical serious slug flow and transition flow pattern
Curve graph；
Fig. 5 is correct using the Flow Regime Ecognition under pressure difference signal length different after the existing identifying system based on water surface signal
Rate curve graph, wherein Fig. 5 (a) is that flow pattern is being divided into the identification of each flow pattern in the case of Stable Manifold and harmful flow pattern two major classes just
True rate curve graph, Fig. 5 (b) are the identification of each flow pattern in the case of harmful flow pattern to be subdivided into typical serious slug flow and transition flow pattern
Accuracy curve graph.
Specific embodiment
Come to carry out detailed description to the present invention below in conjunction with attached drawing.It should be appreciated, however, that attached drawing has been provided only more
Understand the present invention well, they should not be interpreted as limitation of the present invention.In the description of the present invention, it is to be understood that,
Term " first ", " second " etc. are only used for the purpose of description, are not understood to indicate or imply relative importance.
As shown in Figure 1, harmful quick identification device of flow pattern includes vertical-horizontal elbow in the defeated standpipe of collection provided by the invention
Component 1, the first pressure difference signal sensor 2, the second pressure difference signal sensor 3, the first resistance element 4, the second resistance element 5 and meter
Calculation machine 6, wherein vertical-horizontal bend part 1 includes 11,90 ° of elbows 12 of vertical pipe and horizontal pipe 13, and vertical pipe
11,90 ° of elbows 12, horizontal pipe 13, the first resistance element 4 are identical with the internal diameter D of the second resistance element 5.
90 ° of 12 one end of elbow are fixedly connected at the top of vertical pipe 11,90 ° of 12 other ends of elbow are fixedly connected with horizontal pipe 13
One end constitutes vertical-horizontal bend part 1.The bottom of vertical pipe 11 collects defeated standpipe for being fixedly connected, horizontal pipe 13
Outer end is used to be fixedly connected the inlet duct of gas-liquid separator.The first pressure difference signal sensor 2 is provided on vertical pipe 11
With the first resistance element 4, the first pressure difference signal sensor 2 for acquiring the pressure of vertical pipe 11 at the first resistance element 4 in real time
Difference signal.The second pressure difference signal sensor 3 and the second resistance element 5, the second pressure difference signal sensing are provided on horizontal pipe 13
Device 3 for acquiring the pressure difference signal of horizontal pipe 13 at the second resistance element 5 in real time.First pressure difference signal sensor 2 and second
Pressure difference signal sensor 3 is also electrically connected computer 6, and computer 6 is believed according to the first pressure difference signal sensor 2 and the second pressure difference
The pressure difference signal that number sensor 3 acquires in real time, collects the flow pattern of defeated standpipe for identification.
In a preferred embodiment, the first resistance element 4 and the second resistance element 5 can use flange pair or valve
Door.
In a preferred embodiment, the outer end of horizontal pipe 13 can also pass through pipeline or the vertical downcomer tube of having a down dip
Road connects gas-liquid separator.
As shown in Fig. 2, the total length L of vertical pipe 111(including first resistance element 4) is greater than or equal to 15 times of internal diameter D,
The position of first resistance element 4 i.e. the first resistance element 4 and 11 top distance L of vertical pipe3Can according to the actual situation into
Row setting.The total length L of horizontal pipe 132At a distance from (including the second resistance element 5), the second resistance element 5 and 90 ° elbow 12
L5It is as small as possible in the case where meeting the second resistance element 5 and the second pressure difference signal 3 installation requirement of sensor.90 ° of elbows 12
Radius of curvature R can be chosen according to the actual situation based on internal diameter D.
In a preferred embodiment, two pressure tappings of the first pressure difference signal sensor 2 are located at 11 tube wall of vertical pipe
Any one bus (being located on tube wall and be parallel to the straight line in conduit axis direction) on, and the first pressure difference signal sensor
2 pressure length L4More than or equal to 15 times internal diameter D；Two pressure tappings of the second pressure difference signal sensor 3 are located at the second resistance component
(horizontal pipe 13 is distributed along the gas-liquid two-phase of pipeline section radial direction for the radial lowest point of the horizontal pipe 13 of 5 upstream and downstream of part
It is not identical), the pressure length L of the second pressure difference signal sensor 36It can be set according to the actual situation.
In a preferred embodiment, 11,90 ° of the vertical pipe connection types between elbow 12 and horizontal pipe 13,
The connection type and horizontal pipe 13 and the connection type of gas-liquid separator inlet duct of vertical pipe 11 and the defeated standpipe of collection are equal
It can be using welding or flanged joint.Above-mentioned connection is respectively welding, flanged joint and flanged joint in the present embodiment.
In a preferred embodiment, L1=35D, L2=8D, L3=26D, L4=15D, L5=3D, L6=5D, R=
6D。
In a preferred embodiment, flow pattern detection system is provided in computer 6, flow pattern detection system uses
LabVIEW virtual instrument software, including flow pattern setting module and Flow Regime Ecognition module.Flow pattern setting module is for presetting collection
All flow pattern types of defeated standpipe, including harmful flow pattern (UST) and Stable Manifold (ST), as shown in Figure 3, wherein harmful flow pattern
(UST) include typical serious slug flow (SS) and transition flow pattern (TR), typical serious slug flow (SS) include the serious section of the first kind
Plug flow (SS1), the second class serious slug flow (SS2) and irregular second class serious slug flow (IRSS2) etc., transition flow pattern (TR)
Including third class serious slug flow (SS3), concussion flow pattern (OSC) and irregular concussion flow pattern (IROSC) etc..Flow Regime Ecognition module
For using support vector machines or neural network, sensed according to the preset flow pattern type of flow pattern setting module, the first pressure difference signal
The mean value for the pressure difference signal that the mean value and standard deviation and the second pressure difference signal sensor 3 for the pressure difference signal that device 2 acquires acquire with
Standard deviation, identification collect whether defeated standpipe is harmful flow pattern, when recognition result is harmful flow pattern, then pre- according to flow pattern setting module
If flow pattern type, the first pressure difference signal sensor 2 acquisition pressure difference signal mean value, standard deviation and power spectrum dominant frequency (power
Spectrum dominant frequency, which refers to, calculates the corresponding frequency in maximum power place in the corresponding power of signal different frequency component, power profiling
It is variation relation of the signal energy feature with frequency, for characterizing energy size entrained by different frequency component) and second
Mean value, standard deviation and the power spectrum dominant frequency for the pressure difference signal that pressure difference signal sensor 3 acquires, identification collect defeated standpipe nocuousness flow pattern
Type.
Based on the quick identification device of harmful flow pattern in the defeated standpipe of above-mentioned collection, the present invention also provides harmful in a kind of defeated standpipe of collection
Flow pattern method for quickly identifying, comprising the following steps:
1) one end for collecting the defeated standpipe water surface or more is fixedly connected to one end of vertical pipe 11, the other end of vertical pipe 11
Horizontal pipe 13 is connected by 90 ° of elbows 12, and the other end of horizontal pipe 13 is fixedly connected with gas-liquid separator.
2) the first resistance element 4 is set on vertical pipe 11, the second resistance element 5 is set on horizontal pipe 13.
3) the first pressure difference signal sensor 2 acquires the pressure difference signal of vertical pipe 11 at the first resistance element 4, the second pressure difference
Signal transducer 3 acquires the pressure difference signal of horizontal pipe 13 at the second resistance element 5.
4) nondimensionalization processing is carried out to the pressure difference signal at the first resistance element 4 and the second resistance element 5 respectively, is obtained
The mean value and standard deviation of pressure difference signal at first resistance element 4 and the second resistance element 5.
5) the power spectrum dominant frequency of pressure difference signal at the first resistance element 4 and the second resistance element 5 is calculated separately.
6) believed according to pressure difference at preset all flow pattern types and the first resistance element 4 and the second resistance element 5
Number mean value and standard deviation, identification collects whether defeated standpipe is harmful flow pattern, when collecting defeated standpipe is harmful flow pattern, enters step
7)；When collecting defeated standpipe is not harmful flow pattern, output collects the Flow Regime Ecognition result of defeated standpipe.
7) according to pressure difference signal at preset flow pattern type and the first resistance element 4 and the second resistance element 5
Mean value, standard deviation and power spectrum dominant frequency, identification collect the type of defeated standpipe nocuousness flow pattern.
Below by the quick identification device of harmful flow pattern in the defeated standpipe of the specific embodiment collection that the present invention will be described in detail:
Collect closely related with the flow of gas-liquid separator inlet duct whether harmful flow pattern generation of defeated standpipe.When gas-liquid point
When at least one is higher from device entrance gas phase and liquid phase flow, collects flow pattern in defeated standpipe and stablize；If gas phase and liquid phase flow are equal
When not high, then collect in defeated standpipe and harmful flow pattern occur.The present invention is based on flow resistance and weight position pressure difference signal convection type into
Row characterization to obtain enough sensitivity, then needs enough length, that is, needs to occupy sea since the on-way resistance of pipeline is smaller
More spaces on imported oil gas platform.The present invention generates local resistance using resistance element thus, so that sensitivity is met the requirements,
Meanwhile resistance element is identical as internal diameter of the pipeline, the absolute value of resistance (pressure difference signal) is simultaneously little, and the influence to flowing can still neglect
Slightly.
When gas-liquid separator entrance liquid phase flow is higher, local resistance is very sensitive to the variation of flow.Turn in flow pattern
Near variable boundary, with the increase of liquid phase flow, it is more stable to collect flow pattern in defeated standpipe, at this point, local resistance pressure difference signal is more
Greatly, axial heavy position pressure difference signal may increase and may also reduce but at the first resistance element 4, i.e., heavy position pressure difference signal is possible to
There are certain negative functions for Partial Resistance pressure difference signal, are unfavorable for Flow Regime Ecognition, therefore, measure at the second resistance element 5
Local resistance to avoid weight position pressure difference signal influence.
When gas-liquid separator entrance liquid phase flow is lower and gas phase flow rate is higher, common local wink in horizontal pipe 13
When flow pattern be wavy stratified flow patterns or annular flow, resistance pressure difference signal is insensitive to the variation of gas phase flow rate, at this time the second resistance component
Pressure difference signal at part 5 is unsuitable for the identification of harmful flow pattern, but Local Instantaneous flow pattern common in vertical pipe 11 is in slug flow
Or mixed shape stream, local resistance pressure difference signal are more sensitive to the variation of gas phase flow rate, at this time using the pressure at the first resistance element 4
Difference signal harmful flow pattern (UST) for identification.Further study show that in change of flow near border, with gas phase flow rate
Increase, gas phase is stronger to the castering action of liquid phase, collect defeated standpipe flow pattern it is more stable while, not only local resistance pressure difference believe
It is number bigger, and the when equal liquid holdup for collecting defeated riser top is also higher, i.e., heavy position pressure difference signal is also bigger, shows to weigh position pressure difference at this time
Signal is also advantageous for Flow Regime Ecognition.Therefore, the pressure length L of the first pressure difference signal sensor 26The first resistance component can be suitably larger than
The height of part 4, but should not be too large so that weight position pressure difference signal and gas phase flow rate are changed into negative correlation.
When gas-liquid separator entrance gas-liquid and liquid phase flow very it is low i.e. far from change of flow boundary when, collect in defeated standpipe and be in
Typical serious slug flow (SS).Although such nocuousness flow pattern shows strong intermittent and significant periodicity --- gas-liquid point
Flow from device entrance is constant, but collects the gas-liquid flow big ups and downs in defeated standpipe, at this point, only relying on local resistance pressure difference signal
Or weight position pressure difference signal is only relied on, there are some cases can not accurately identify, but the two cooperation can well solve second
Pressure difference signal sensor 3 acquire local resistance pressure difference signal can effectively distinguish liquid phase stream amount it is higher when Stable Manifold (ST)
Go out stage and gas-liquid eruptive stages with the liquid plug flow of typical serious slug flow (SS).The pressure of first pressure difference signal sensor 2 acquisition
Difference signal (be nearly identical under low discharge weight position pressure difference signal) can effectively distinguish gas phase flow rate it is higher when Stable Manifold with
The liquid plug growth phase of typical serious slug flow (SS) and the liquid phase after eruption fall the stage after rise.
To illustrate advantage of the invention, six kinds of flow patterns of SS1, SS2, SS3, OSC, IR and ST, each flow pattern sample are investigated
Signal length needed for the accuracy of this first step identification reaches 90% is T1.SS1, SS2, IRSS2, SS3, OSC, IROSC six
In kind flow pattern, the desired signal length that the accuracy of each flow pattern sample second step identification reaches 90% is T2.Using the present invention
The Flow Regime Ecognition accuracy of quick identification device is as shown in Figure 4, wherein T1=11s, T2=50s.Believed using existing based on the water surface
Number identifying system (only acquisition collect defeated riser top pressure signal) Flow Regime Ecognition accuracy it is as shown in Figure 5, wherein T1=
41s, T2=480s.It can be seen that signal length needed for identifying harmful flow pattern is significantly after using the present invention quickly identification device
Shorten, T1And T273% and 90% has been respectively shortened.Due to identifying real-time the time required to identification process itself very short (< 1s)
Depending on signal acquisition time, i.e. signal length.Therefore, after using quickly identification device of the invention, the reality of harmful Flow Regime Ecognition
When property is significantly improved, and quick identification is realized.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, connection type and manufacture craft etc. are all
It can be varied, all equivalents and improvement carried out based on the technical solution of the present invention should not exclude
Except protection scope of the present invention.
Claims (9)
1. the quick identification device of harmful flow pattern in a kind of defeated standpipe of collection, which is characterized in that the device includes:
One vertical-horizontal bend part, the vertical-horizontal bend part are successively connected by vertical pipe, elbow and horizontal pipe
The bottom of inverted L shape structure made of connecing, the vertical pipe collects defeated standpipe for connecting, and the outer end of the horizontal pipe is used for
Connect gas-liquid separator；
Two resistance elements, each resistance element are arranged on the vertical pipe and horizontal pipe；
Two pressure difference signal sensors, each pressure difference signal sensor are used to acquire in real time and manage at the corresponding resistance element
The pressure difference signal in road；
Computer, the pressure difference signal that the computer acquires in real time according to each pressure difference signal sensor, for identification institute
State the flow pattern for collecting defeated standpipe.
2. the quick identification device of harmful flow pattern in a kind of defeated standpipe of collection as described in claim 1, which is characterized in that each described
Resistance element is all made of flange pair or valve.
3. the quick identification device of harmful flow pattern in a kind of defeated standpipe of collection as claimed in claim 2, which is characterized in that the level
The outer end of pipeline passes through pipeline or the vertical downcomer tube road connection gas-liquid separator of having a down dip.
4. the quick identification device of harmful flow pattern in a kind of defeated standpipe of collection as described in claim 1, which is characterized in that the calculating
Flow pattern detection system is provided in machine, the flow pattern detection system includes flow pattern setting module and Flow Regime Ecognition module；
The flow pattern setting module is for presetting all flow pattern types for collecting defeated standpipe；
The Flow Regime Ecognition module is used to use support vector machines or neural network, according to the preset stream of flow pattern setting module
Type type, the mean value and standard deviation of each pressure difference signal, identification collect whether defeated standpipe is harmful flow pattern；When recognition result is nocuousness
When flow pattern, according to the preset flow pattern type of the flow pattern setting module and mean value, standard deviation and the power of each pressure difference signal
Dominant frequency is composed, identification collects the type of defeated standpipe nocuousness flow pattern.
5. such as the quick identification device of harmful flow pattern in a kind of defeated standpipe of the described in any item collection of Claims 1-4, feature exists
In the total length of the vertical pipe is greater than or equal to the internal diameter of 15 times of vertical pipes.
6. such as the quick identification device of harmful flow pattern in a kind of defeated standpipe of the described in any item collection of Claims 1-4, feature exists
In two pressure tappings of the pressure difference signal sensor are located at any one mother of the vertical pipe tube wall on the vertical pipe
On line, the pressure length of the pressure difference signal sensor is greater than or equal to the interior of 15 times of vertical pipes on the vertical pipe
Diameter；Two pressure tappings of the pressure difference signal sensor are located at the described of the corresponding resistance element upstream and downstream on the horizontal pipe
The radial lowest point of horizontal pipe.
7. such as the quick identification device of harmful flow pattern in a kind of defeated standpipe of the described in any item collection of Claims 1-4, feature exists
In between the vertical pipe, elbow and horizontal pipe, between the vertical pipe and the defeated standpipe of the collection and the water
Welding or flanged joint are all made of between flat pipeline and the gas-liquid separator.
8. the quick identification device of harmful flow pattern in a kind of defeated standpipe of collection as described in claim 1, which is characterized in that described vertical
Pipeline, elbow are identical with the internal diameter of horizontal pipe, and the total length of the vertical pipe is equal to 35 times of internal diameters, the horizontal pipe
Total length is equal to 8 times of internal diameters, with the distance between the corresponding resistance element equal to 26 times of internal diameters, institute at the top of the vertical pipe
The pressure length for stating the pressure difference signal sensor on vertical pipe is equal to 15 times of internal diameters, the resistance component on the horizontal pipe
The distance between part and the elbow are equal to 3 times of internal diameters, the pressure length of the pressure difference signal sensor on the horizontal pipe
The radius of curvature of equal to 5 times internal diameters, the elbow is equal to 6 times of internal diameters.
9. harmful flow pattern method for quickly identifying in a kind of defeated standpipe of collection, which comprises the following steps:
1) one end for collecting the defeated standpipe water surface or more is fixedly connected with to one end of vertical pipe, the other end of vertical pipe passes through elbow
One end of horizontal pipe is connected, and the other end of horizontal pipe is fixedly connected with gas-liquid separator；
2) resistance element is respectively set on vertical pipe and horizontal pipe；
3) pressure difference signal of pipeline at two resistance elements is acquired by pressure difference signal sensor respectively；
4) nondimensionalization processing is carried out to the pressure difference signal of pipeline at two resistance elements respectively, obtains pipeline pressure at two resistance elements
The mean value and standard deviation of difference signal；
5) the power spectrum dominant frequency of pipeline pressure difference signal at two resistance elements is calculated separately；
6) according to the mean value and standard deviation of pipeline pressure difference signal at preset all flow pattern types and two resistance elements, know
Do not collect whether defeated standpipe is harmful flow pattern, when collecting defeated standpipe is harmful flow pattern, enters step 7)；It is not harmful when collecting defeated standpipe
When flow pattern, output collects the Flow Regime Ecognition result of defeated standpipe；
7) according to mean value, standard deviation and the power spectrum of pipeline pressure difference signal at preset flow pattern type and two resistance elements
Dominant frequency, identification collect the type of defeated standpipe nocuousness flow pattern.
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