CN106338365B - A kind of the leakage monitoring prior-warning device and method of pulverized coal conveying device - Google Patents
A kind of the leakage monitoring prior-warning device and method of pulverized coal conveying device Download PDFInfo
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- CN106338365B CN106338365B CN201610683080.4A CN201610683080A CN106338365B CN 106338365 B CN106338365 B CN 106338365B CN 201610683080 A CN201610683080 A CN 201610683080A CN 106338365 B CN106338365 B CN 106338365B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/002—Investigating fluid-tightness of structures by using thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
Abstract
The invention discloses the leakage monitoring prior-warning devices and method of a kind of pulverized coal conveying device.Leakage monitoring prior-warning device includes the distributed temperature sensing optical fiber that coiling is pasted on conveying steel pipe outer wall, and conveying steel pipe is coated with insulating layer, protective case, and conveying steel pipe marks off continuous several monitoring regions along axis.It is equipped with jacket outside protective case in each monitoring region, jacket both ends are protruded into Nian Jie with conveying steel pipe after protective case and insulating layer, and jacket forms closed pressure detecting cavity with conveying steel pipe outer wall.In pressure detecting cavity, conveying steel pipe outer wall is equipped with inside optical fiber raster vibration sensor and insulating layer and is equipped with optical pressure sensor.The present invention not only can make accurate judgement and early warning to whether pulverized coal conveying device occurs leakage because of hole or crack at leakage initial stage, also accurate judgement can be made to whether pulverized coal conveying device occurs leakage because of coal dust friction in transit, and accurate capture and positioning are made to leakage point, issue early warning, it is ensured that the safety in production of enterprise.
Description
Technical field
The present invention relates to the leakage monitoring prior-warning device and method of a kind of pulverized coal conveying device, espespecially a kind of monitoring and early warning
The device and method whether leaked for the pulverized coal conveying device in coal oil/gas technique.
Background technique
For coal oil/gas industry, safety in production is the cardinal task of enterprise.When executing coal oil/gas technique, raw coal is wanted
It first passes through belt conveyor to send to run coal bin, coal of the partial size at 63 microns to 500 microns is made after grinding, drying, sorting
Coal dust is delivered to pulverized coal warehouse using low-pressure nitrogen, then is delivered to reaction unit by high pressure nitrogen by powder.Current pneumatic conveying
The maximum transmission capacity of route --- pulverized coal conveying device may be up to 160 tons/item/hour.In actual implementation, a large amount of pulverized coal particles
The inner wall for the pulverized coal conveying device that can ceaselessly rub on the way is conveyed in high speed, with the accumulation of time, especially coal dust conveying dress
The curved wall of the lower wall surface, bending part of setting inner wall is easily worn through, to cause leakage of pulverized coal, mix with air to be formed it is flammable
Open fire is encountered after object and easily causes fire, or even explosion, and pernicious safety responsibility accident is caused to occur.
High temperature inert hot gas is all made of as delivery vehicles to coal dust conveying in the industry at present, and along the coal dust of heat tracing property
Conveying device is equipped with matched insulating layer.From practical operation it can be found that due to insulating layer presence, pulverized coal conveying device because mill
When damaging early period of origination leakage, the safety inspection personnel of line walking are difficult to discovery is visually observed, in addition this manual inspection side
Not only safety cannot be guaranteed formula, also drastically influence the production efficiency of enterprise, and to guarantee production safety, factory is generallyd use
The method of stop production to overhaul carries out ultrasonic inspection, but this mode low efficiency, heavy workload, reality along pipeline with supersonic detector
When property is poor.
Some enterprises monitor leakage of pulverized coal situation using traditional point type pressure sensor at present, but from actual implementation
It can be seen that the position leaked has very big randomness, therefore this technology can not since pulverized coal conveying device is longer
Leakage is monitored, and can only be detected after leakage occurs, pre-alerting ability is lacked.
Summary of the invention
The purpose of the present invention is to provide the leakage monitoring prior-warning device and method of a kind of pulverized coal conveying device, this device and
On the one hand whether method not only can occur to leak to make accurately to sentence to pulverized coal conveying device at leakage initial stage because of hole or crack
It is disconnected, also accurate judgement can be made to whether pulverized coal conveying device occurs leakage because of coal dust friction in transit, and to leakage
Point makes accurate capture and positioning, can ensure the safety in production of enterprise well, on the other hand, can also be to pulverized coal conveying device
Weak part realizes prediction and positioning, formulates halt production maintenance project for enterprise and provides foundation.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of leakage monitoring prior-warning device of pulverized coal conveying device, it is characterised in that: it includes interval coiling and is pasted onto
Distributed temperature sensing optical fiber on the entire outer wall of conveying steel pipe is equipped with outside the conveying steel pipe of distributed temperature sensing optical fiber and is successively coated with
Insulating layer, protective case, conveying steel pipe mark off continuous several monitoring regions along axis, in which: the guarantor in each monitoring region
One layer of jacket is equipped with outside sheath, the both ends of jacket closely bond after protruding into protective case and insulating layer with conveying steel pipe, so that folder
Closed pressure detecting cavity is formed between gram corresponding conveying steel pipe outer wall, is in the intracorporal conveying steel of pressure detecting chamber
Pipe outer wall is equipped at least one optical fiber raster vibration sensor, and the installation inside the intracorporal insulating layer of pressure detecting chamber
There are at least one optical pressure sensor, distributed temperature sensing optical fiber, optical fiber raster vibration sensor, optical pressure sensor and letter
Number processing unit is connected.
The jacket is made of the high-intensitive macromolecule resin material of instantaneous photocuring.
When multiple optical fiber raster vibration sensors are arranged in a monitoring region, all fiber gratings
Vibrating sensor is uniformly distributed on the conveying steel pipe outer wall.
The distribution temperature sensing optical fiber is equally spaced wound on the conveying steel pipe outer wall, to convey steel described in real-time monitoring
Temperature field outside pipe on conveying steel pipe length direction.
A kind of leakage monitoring method for early warning that the leakage monitoring prior-warning device based on the pulverized coal conveying device is realized,
Be characterized in that, it comprising steps of
The distribution temperature sensing optical fiber and the optical fiber raster vibration sensor and institute in each monitoring region
It states optical pressure sensor and feeds back detection signal to the signal processing apparatus in real time, detection is believed by the signal processing apparatus
It number carries out processing analysis and judges, in which:
When the pressure signal that the optical pressure sensor in a certain monitoring region is fed back to changes, show this prison
There is hole or crack in the conveying steel pipe surveyed in region, i.e., will or have occurred and that leakage, then the signal processing device
It sets and issues warning signal；
When the vibration signal characteristics that the optical fiber raster vibration sensor in a certain monitoring region is fed back to change,
Show that the conveying steel pipe in this monitoring region will or have occurred and that leakage, then the signal processing apparatus issues early warning
Signal, and the signal processing apparatus is further sentenced according to the temperature signal that the distributed temperature sensing optical fiber is fed back to
Disconnected: when the temperature field of a certain position in this monitoring region also changes, then the changed position in temperature field is judged as letting out
Leak source, the signal processing apparatus issue alarm signal.
Further, when the pressure signal that the optical pressure sensor in a certain monitoring region is fed back to occurs to be more than to set
When the large change of constant-pressure difference, show that this monitoring region has leaked, then the signal processing apparatus issues alarm
Signal.
Further, when the vibration signal characteristics hair that the optical fiber raster vibration sensor in a certain monitoring region is fed back to
Raw is more than that the large change of setting vibration difference or a certain temperature field for monitoring a certain position in region occur to be more than setting
When the large change of temperature gap, show that this monitoring region has leaked, the signal processing apparatus issues alarm signal.
The invention has the advantages that
Leakage monitoring prior-warning device of the present invention and method are safe and reliable to operation, and sensitivity of detection and accuracy are high, it can be ensured that
Enterprise safety operation.One aspect of the present invention can convey coal dust in first time at leakage initial stage by optical pressure sensor
Whether device occurs leakage because of hole or crack is made accurate judgement and early warning, and with the accumulation of data, can be passed through
To merging for distributed temperature sensing data and pipe vibration data, to judge the weak part of conveying steel pipe, so as to user
There is enough time to carry out reasonable parking maintenance, takes to stop in emergency hastily when avoiding largely leaking and cause unnecessary loss, separately
On the one hand, the present invention can make accurate judgement to whether pulverized coal conveying device occurs leakage because of coal dust friction in transit,
And accurate capture and positioning are made to leakage point, early warning, alarm are issued, so that user can be targetedly to pulverized coal conveying device
On-call maintenance is carried out, the maintenance used time is greatly reduced, effectively increases working efficiency.
It is of the invention be mainly characterized by deploying in pulverized coal conveying device outermost it is a certain number of high-intensitive, resistant to high temperature
Resin jacket, to monitor that coal dust leaks in time, and due to the protection of jacket, coal dust will not be leaked into atmosphere, from
And factory is made to have time enough to be stopped in an orderly manner, it avoids because of loss caused by stopping in emergency.
Detailed description of the invention
Fig. 1 is the composition schematic diagram of leakage monitoring prior-warning device of the present invention.
Specific embodiment
As shown in Figure 1, leakage monitoring prior-warning device of the present invention is for defeated in pulverized coal conveying device by nitrogen to coal dust
Whether a part will or have occurred and that leakage is monitored and early warning, alarm during sending.Traditional pulverized coal conveying device
Including conveying steel pipe 60, conveying steel pipe 60 is coated with insulating layer 70, and insulating layer 70 is coated with protective case 80, and coal dust is conveying
It realizes and transmits by nitrogen in steel pipe 60.
Such as figure, leakage monitoring prior-warning device of the present invention includes compartment of terrain winding coiling at a certain distance and is pasted onto conveying steel
Distributed temperature sensing optical fiber 20 on the entire outer wall of pipe 60 is equipped with outside the conveying steel pipe 60 of distributed temperature sensing optical fiber 20 and successively coats
There are insulating layer 70, protective case 80 (insulating layer 70 and protective case 80 belongs to it is well known that technology), conveying steel pipe 60 is along its axis
(i.e. along conveying steel pipe length direction) marks off continuous several monitoring regions (sectional region), in which: each monitoring
Be equipped with one layer of jacket 50 outside protective case 80 in region, the both ends of jacket 50 protrude into after protective case 80 and insulating layer 70 with conveying
60 outer wall of steel pipe closely bonds, so as to form closed pressure detecting chamber between corresponding 60 outer wall of conveying steel pipe of jacket 50
Body, such as Fig. 1, pressure detecting cavity are presented the bag-shaped of two edge sealings, will be coated with the conveying steel pipe of insulating layer 70 and protective case 80
60 wrap up, and being sticked in intracorporal 60 outer wall of the conveying steel pipe make-up of pressure detecting chamber has at least one optical fiber raster vibration biography
Sensor 30, and be equipped with inside the intracorporal insulating layer 70 of pressure detecting chamber at least one optical pressure sensor 40 (
Here, optical pressure sensor 40 does not reside on 60 outer wall of conveying steel pipe), distributed temperature sensing optical fiber 20, optical fiber raster vibration
Sensor 30, optical pressure sensor 40 signal port respectively and for determine whether leak, leakage point and issue early warning, report
The corresponding signal port of alert signal processing apparatus 10 is connected.
In actual design, jacket 50 is made of the high-intensitive macromolecule resin material (existing material) of instantaneous photocuring,
It is usually made by the macromolecular patch of photocuring, high intensity, high adhesion, this resin material and steel tubing have very
Strong degree of adhesion, pressure resistance is up to 6MPa.Jacket 50 is able to bear the pressure generated when conveying steel pipe 60 leaks without letting out coal dust
It drains in atmosphere.
In the present invention, comprehensive to the progress of entire pulverized coal conveying device to realize respectively between monitoring region in continuous state
Monitoring, and in actual implementation, the bending part of conveying steel pipe 60 should correspond to one monitoring region of design, be emphasis monitoring pair
As.
In actual design, when multiple optical fiber raster vibration sensors 30 are arranged in a monitoring region, all optical fiber
Grating vibration sensor 30 is uniformly distributed on 60 outer wall of conveying steel pipe.For a monitoring region, interior mountable multiple optics pressures
Force snesor 40, but there are cost improve, function waste the shortcomings that.
In the present invention, optical pressure sensor 40 itself is not charged, and use is safe, can be in real-time perception jacket 50
Pressure.Distributed temperature sensing optical fiber 20 is distributed temperature measuring device, is equally spaced wound on 60 outer wall of conveying steel pipe, with real-time
The temperature field outside conveying steel pipe 60 on conveying steel pipe length direction is monitored, it can be to each portion of entire 60 outer wall of conveying steel pipe
The temperature of position is detected.Optical fiber raster vibration sensor 30 can real-time detection conveying steel pipe 60 Vibration Condition.
In the present invention, distributed temperature sensing optical fiber 20, optical fiber raster vibration sensor 30, optical pressure sensor 40 are this
The well-known devices and device in field, signal processing apparatus 10 is technology known in the art, therefore their specific structure is not at this
In be described in detail.
Based on aforementioned present invention leakage monitoring prior-warning device, the invention also provides a kind of leakages of pulverized coal conveying device to supervise
Method for early warning is surveyed, it includes the following steps:
Distributed temperature sensing optical fiber 20 and optical fiber raster vibration sensor 30 and optical pressure biography in each monitoring region
Sensor 40 feeds back the detection signal that each measurement obtains to signal processing apparatus 10 in real time, by signal processing apparatus 10 to each detection
Signal carries out processing analysis and judges, in which:
When the pressure signal that the optical pressure sensor 40 in a certain monitoring region is fed back to changes, show this monitoring
There is hole or crack in conveying steel pipe 60 in region, i.e., will or have occurred and that leakage, and then signal processing apparatus 10 issues
Pre-warning signal.
And further, when the pressure signal that the optical pressure sensor 40 in a certain monitoring region is fed back to occurs to surpass suddenly
Cross the large change (i.e. compared with normal pressure value, the variation more than set pressure differential value occurs suddenly) of set pressure differential value
When, show that this monitoring region has leaked, then signal processing apparatus 10 issues alarm signal.
When vibration signal (vibration frequency or the vibration wave that the optical fiber raster vibration sensor 30 in a certain monitoring region is fed back to
Shape etc.) feature when changing, shows that the conveying steel pipe 60 in this monitoring region will or have occurred and that leakage, then at signal
Reason device 10 issues warning signal, and signal processing apparatus 10 is in this monitoring region according to distributed temperature sensing optical fiber 20
The temperature signal that partial feedback returns further is judged: it also changes when this monitors the temperature field of a certain position in region,
Then the changed position in temperature field is judged as leakage point, that is, captures and oriented leakage point, thus signal processing apparatus
10 issue alarm signal.
And further, when the vibration signal characteristics that the optical fiber raster vibration sensor 30 in a certain monitoring region is fed back to are prominent
So occur (i.e. compared with normal vibration value, to occur suddenly more than setting vibration difference more than the large change of setting vibration difference
Variation) or it is a certain monitoring region in a certain position temperature field occurs suddenly be more than set temperature difference larger change
When changing and (i.e. compared with normal temperature value, the variation more than set temperature difference occurring suddenly), show that this monitoring region has occurred
Leakage, signal processing apparatus 10 issue alarm signal.
Implementation principle of the invention is described below.
As pulverized coal conveying device puts into effect the lengthening of time, the tube wall of conveying steel pipe 60 because of coal dust during transport
Constantly friction can be gradually thinning, causes the thermal coefficient at thinning position to increase, more heat transfer is transmitted to outside.When conveying steel pipe 60
When leaking, the coal dust and nitrogen leaked out can occur heat with insulating layer 70 and exchange, and break leakage point insulating layer nearby
Uniformity of Temperature Field inside 70 causes local temperature variation obvious, therefore use distribution temperature sensing optical fiber 20 to be at this time can be with
Leakage point is accurately captured and positions, it is thinning in conveying steel pipe 60 but when not yet leak, although thinning position
Thermal coefficient change, the temperature field inside the corresponding insulating layer 70 in thinning position changes, but the change in this temperature field
Change is fainter, and the noise of temperature signal is poor, therefore distributed temperature sensing optical fiber 20 is used alone to capture and position
There is very big erroneous judgement in leakage point, and when tube wall is thinning caused by because of friction, the vibration performance of conveying steel pipe 60 can change,
So in the present invention, distributed temperature sensing optical fiber 20 is combined with optical fiber raster vibration sensor 30, to conveying steel pipe 60
Whether generation leakage is judged.Specifically, when the tube wall of conveying steel pipe 60 is thinning, i.e., by leaking when, when optical fiber light
When grid vibrating sensor 30 detects the vibration performance and not thinning (vibration performance when normal pulverized coal conveying) of conveying steel pipe 60
Difference when changing, in conjunction with the temperature signal (temperature signal is obvious at this time) that distributed temperature sensing optical fiber 20 detects, is come
The thinning position position for determining conveying steel pipe 60, captures and orients leakage point, then issues alarm.
In addition, since the pressure inside conveying steel pipe 60 is higher than outside, when conveying steel pipe 60 goes out because using overlong time
When existing hole or crack, 70 pressure rise of insulating layer will lead to, therefore the present invention passes through the pressure in detection insulating layer 70, to reach
To whether occurring the testing goal in hole or crack to conveying steel pipe 60, and then prevent leakage.Then, the present invention passes through light
Pressure sensor 40 is learned to the Sensitive Detection means of pressure, at leakage initial stage, whether conveying steel pipe 60 because of hole or can be split
It stitches and leakage occurs and judges.When will or have begun leakage, early warning is issued, so that user has time enough progress
Reasonable parking maintenance, avoiding stopping in emergency causes damages.
In the present invention simultaneously, even if a leak occurs, design structure of the invention also can guarantee that coal dust and nitrogen will not be straight
It connecing and leaks into atmosphere, but leak in the pressure detecting cavity that jacket 50 is formed, jacket 50 is high-intensitive high molecular material,
Compressive resistance with higher, to make user have the orderly parking maintenance of time enough, is reduced so as to form certain protection
Unnecessary waste.
The invention has the advantages that
Leakage monitoring prior-warning device of the present invention and method are safe and reliable to operation, and sensitivity of detection and accuracy are high, it can be ensured that
Enterprise safety operation.One aspect of the present invention can convey coal dust in first time at leakage initial stage by optical pressure sensor
Whether device occurs leakage because of hole or crack is made accurate judgement and early warning, and with the accumulation of data, can be passed through
To merging for distributed temperature sensing data and pipe vibration data, to judge the weak part of conveying steel pipe, so as to user
There is enough time to carry out reasonable parking maintenance, takes to stop in emergency hastily when avoiding largely leaking and cause unnecessary loss, separately
On the one hand, the present invention can make accurate judgement to whether pulverized coal conveying device occurs leakage because of coal dust friction in transit,
And accurate capture and positioning are made to leakage point, early warning, alarm are issued, so that user can be targetedly to pulverized coal conveying device
On-call maintenance is carried out, the maintenance used time is greatly reduced, effectively increases working efficiency.
The above is present pre-ferred embodiments and its technical principle used, and is come for those skilled in the art
It says, without departing from the spirit and scope of the present invention, any equivalent transformation based on the basis of technical solution of the present invention,
Simple replacement etc. obviously changes, and all falls within the protection scope of the present invention.
Claims (6)
1. a kind of leakage monitoring prior-warning device of pulverized coal conveying device, it is characterised in that: it includes interval coiling and is pasted onto defeated
The distributed temperature sensing optical fiber on the entire outer wall of steel pipe is sent, is equipped with outside the conveying steel pipe of distributed temperature sensing optical fiber and is successively coated with guarantor
Warm layer, protective case, conveying steel pipe mark off continuous several monitoring regions along axis, in which: the protection in each monitoring region
Set is external to be equipped with one layer of jacket, and jacket is made of the high-intensitive macromolecule resin material of instantaneous photocuring, and the both ends of jacket are protruded into
It is closely bonded after protective case and insulating layer with conveying steel pipe, so as to be formed between the corresponding conveying steel pipe outer wall of jacket closed
Pressure detecting cavity, in the intracorporal conveying steel pipe outer wall of pressure detecting chamber be equipped at least one optical fiber grating vibration sensor
Device, and at least one optical pressure sensor, distributed temperature-sensitive are installed inside the intracorporal insulating layer of pressure detecting chamber
Optical fiber, optical fiber raster vibration sensor, optical pressure sensor are connected with signal processing apparatus；When the optics in a certain monitoring region
Show that the conveying steel pipe in this monitoring region hole occurs or splits when the pressure signal of pressure sensor feeds back changes
Seam will or have occurred and that leakage；When the vibration signal characteristics that the optical fiber raster vibration sensor in a certain monitoring region is fed back to
Show that the conveying steel pipe in this monitoring region will or have occurred and that leakage when changing, and anti-according to distributed temperature sensing optical fiber
The temperature signal being fed back to further judges the position for whether being leaked and being accurately positioned leakage point in this monitoring region.
2. the leakage monitoring prior-warning device of pulverized coal conveying device as described in claim 1, it is characterised in that:
When multiple optical fiber raster vibration sensors are arranged in a monitoring region, all optical fiber raster vibrations
Sensor is uniformly distributed on the conveying steel pipe outer wall.
3. the leakage monitoring prior-warning device of pulverized coal conveying device as described in claim 1, it is characterised in that:
It is described distribution temperature sensing optical fiber be equally spaced wound on the conveying steel pipe outer wall, with conveying steel pipe described in real-time monitoring outside
Temperature field of the portion on conveying steel pipe length direction.
What 4. a kind of leakage monitoring prior-warning device based on pulverized coal conveying device described in any one of claims 1 to 3 was realized
Leakage monitoring method for early warning, which is characterized in that it comprising steps of
The optical fiber raster vibration sensor and the light in the distribution temperature sensing optical fiber and each monitoring region
Learn pressure sensor in real time to the signal processing apparatus feed back detection signal, by the signal processing apparatus to detection signal into
Row processing is analyzed and is judged, in which:
When the pressure signal that the optical pressure sensor in a certain monitoring region is fed back to changes, show this monitoring section
There is hole or crack in the conveying steel pipe in domain, i.e., will or have occurred and that leakage, then the signal processing apparatus hair
Pre-warning signal out；
When the vibration signal characteristics that the optical fiber raster vibration sensor in a certain monitoring region is fed back to change, show
The conveying steel pipe in this monitoring region will or have occurred and that leakage, and then the signal processing apparatus issues early warning letter
Number, and the signal processing apparatus is further judged according to the temperature signal that the distributed temperature sensing optical fiber is fed back to:
When the temperature field of a certain position in this monitoring region also changes, then the changed position in temperature field is judged as leaking
Point, the signal processing apparatus issue alarm signal.
5. leakage monitoring method for early warning as claimed in claim 4, it is characterised in that:
When the pressure signal that the optical pressure sensor in a certain monitoring region is fed back to occurs to be more than set pressure differential value
When large change, show that this monitoring region has leaked, then the signal processing apparatus issues alarm signal.
6. leakage monitoring method for early warning as claimed in claim 4, it is characterised in that:
Occur to be more than setting vibration when the vibration signal characteristics that the optical fiber raster vibration sensor in a certain monitoring region is fed back to
The large change of moment value or it is a certain monitoring region in a certain position temperature field occur be more than set temperature difference compared with
When big variation, show that this monitoring region has leaked, the signal processing apparatus issues alarm signal.
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| CN114704780B (en) * | 2022-03-31 | 2023-12-12 | 中海石油气电集团有限责任公司 | LNG long-distance transportation cold leakage on-line monitoring system and method |
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| CN105067190A (en) * | 2015-07-31 | 2015-11-18 | 威特龙消防安全集团股份公司 | Coal dust transmission pipeline leakage early warning detection method |
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