CN201188051Y

CN201188051Y - Positioning apparatus for detecting acoustic wave leakage

Info

Publication number: CN201188051Y
Application number: CNU2008200786160U
Authority: CN
Inventors: 张来宾; 宫敬; 罗宇; 王朝晖; 梁伟; 秦丽娟; 黄国良
Original assignee: BEIJING HUEYA ENERGY TECHNOLOGY Co Ltd
Current assignee: BEIJING HUEYA ENERGY TECHNOLOGY Co Ltd
Priority date: 2008-01-18
Filing date: 2008-01-18
Publication date: 2009-01-28
Anticipated expiration: 2018-01-18

Abstract

The utility model relates to a pipeline leak-detection and location device, in particular to an acoustic wave leak-detection and location device which comprises a plurality of acoustics sensors, a plurality of on-site data collectors, a center server and a communication network which are arranged on a pipeline. In one of the on-site data collectors, a preamplifier is connected with one of the acoustic sensors to carry out amplification on simulated acoustic signals collected by the acoustic sensors, and the output end thereof is connected with an A/D converter by a timing data collection module; the simulated acoustic signals complete analog-digital conversion by the timing data collection module to become digital signals to be transmitted to the center server by the communication network. The utility model adopts an accurate time service of an embedded PC pluses a data collection card and pluses a GPS, having low cost and favorable performance, can adopt multiple network communications, double network redundancies, and mutual backup; and the node amount supported by the utility model is 256, thereby fully satisfying the needs of a long-distance transmission pipeline, having the advantages of rapid detection speed, high detection accuracy, low missing report rate/false report rate, and the like.

Description

Acoustic wave leakage detecting and positioning device

Technical field

The utility model is about a kind of pipeline leak detection locating device, particularly a kind ofly is used for that the detected pressures fluid line leaks and the acoustic wave leakage detecting and positioning device of leak position.

Background technology

The major function of gas oil pipe leakage detection and location device is to detect and locate the escape of liquid and the leak position of long distance pipeline, maintenance in time, the production and transport safety of guarantee oil and gas pipes.The fluid that long distance pipeline is carried can be gas or liquid.

U.S. Pat 6,389,881 disclose a kind of method and apparatus of monitoring pipe leakage and location leakage.The sound wave signal that leakage produced that this method occurs in by seizure on the pipeline that contains pressed gas or fluid comes monitoring leakage.By comparing filtering model to reduce rate of false alarm, increase system sensitivity, to improve the leakage positioning degree of accuracy.

Fig. 1 is that this invents disclosed equipment synoptic diagram, comprising: be installed in along the sound wave sensor 26 of a plurality of interruptions of pipeline 10, and on-site

data gathering processor

20 and 22, and centre data compiles processor 24.Each on-site

data gathering processor

20 and 22 receives the detection signals from the sound wave sensor 26 that is installed in the correspondence on the pipeline 10, and data are handled.This on-site

data gathering processor

20,22 connects and is controlled by centre data and compiles processor 24.On-site

data gathering processor

20,22, timely monitor pressure is also finished preliminary filtration in-situ and is analyzed contrast and data filter.When on-site

data gathering processor

20,22 has monitored a potential leakage signal, just information feedback can be compiled processor 24 to centre data and carry out more deep processing.If compiling processor 24, centre data monitors a leakage signal, through filtering the data of all the sensors, then centre data compile processor 24 can from two or more the multi-sensor data location leak, and logically accept leakage positioning according to field data.Leakage information (comprising leakage positioning) compiles processor 24 by centre data and outputs to and be equipped with SCADA software, on the central host 28 such as the software of Intellution.

This patent is described the process that on-site

data gathering processor

20,22 and centre data compile data processing in the processor 24 in detail.At the scene in the data collection processor 20, at first by low pass filter and high pass filter filtering low frequency and high frequency noise, after the sampled device sampling of pressure input signal analog quantity is converted to digital quantity from the sound wave pressure input signal of sensor 26.Digital signal send after by digital passband filtrator the comparison filtrator be recorded in the on-the-spot computer digital model relatively, this signal is by other parallel filtering.If the output of all filtrations has surpassed the limit by dynamic limit mechanism decision, leakage information will send to centre data next time and compile processor and handle when asking.

Centre data compiles processor 24 receive the information that comes from on-site

data gathering processor

20,22 after, carry out confluence analysis, generate incident file, output to main control system 28.Main control system 28 is joined the software by SCADA, and this software can provide operator interface, and data base administration and report generate.And can send report as requested.

Its principle is when escape of liquid occurring on the pipeline, and the ultralow frequency sound wave at leakage point place will be along pipeline transmission, and the sensor that is installed in pipe ends is responded to.The ultralow frequency sound wave of sensing, through Signal Pretreatment, squelch, signature waveform detects, and time delay estimates, and treatment step such as leakage point location, detects and leaks occurrence positions and leak pore size.

But this patent does not provide the concrete formation that on-site

data gathering processor

20,22 and centre data compile processor 24, compile processor as can be seen according to on-site data gathering processor and centre data to the information processing process, from the signal of sensor after high-pass filtering and low-pass filtering, promptly carry out analog to digital conversion, received analog quantity is converted to digital quantity and analyzes contrast and digital filtering with the data in the computer that is stored in the on-site data gathering processor.And then send centre data to compile processor 24 and carry out more deep processing.This just requires the sensitivity of sensor very high, changes the electric current that can produce greatly for small pressure and changes.Simultaneously because the data of gathering are carried out site disposal, making all needs to be equipped with the raw readings numerical information in the computer at the scene in each processor, make that like this structure of site processor is very huge, cost also can be very high, and when carrying out Data Update, need the signal in each processor be upgraded, relatively also increased workload, and this after treatment the special signal transmssion line of signal demand so also can increase cost.

The utility model content

In view of this, fundamental purpose of the present utility model be to provide a kind of simple in structure, cheap, performance is good is used for a detected pressures fluid line and a station acoustic wave leakage detecting and positioning device that leaks.

Acoustic wave leakage detecting and positioning device provided by the utility model comprises a plurality of acoustic sensors that are arranged on the pipeline, a plurality of on-site data gathering device, central server and communication network, described on-site data gathering device comprises: prime amplifier, simulating signal are to digital signal converter, timing data acquisition module and communication module, wherein:

Described prime amplifier connects acoustic sensor, and the simulated sound wave signals of acoustic sensor collection is amplified, and its output terminal connects described simulating signal to digital signal converter by the timing data acquisition module;

Described simulated sound wave signals will be finished analog to digital conversion by the timing data acquisition module with certain frequency;

Described simulating signal is converted to simulated sound wave signals manageable digital signal and sends central server to by communication network to digital signal converter;

Described central server comprises a plurality of shunt data processors and central data processor, described each shunt data processor is accepted to compare with known thresholding waveform after filtering from the signal of corresponding on-site data gathering device by communication network, if surpass the thresholding waveform shows generation of leakage is arranged, then send central data processor with leakage signal, central data processor is carried out the analysis-by-synthesis computing to the signal from each shunt data processor and is determined leak position, leakage size, by display demonstration, alarm equipment alarm.

Described shunt data processor is by accepting from the receiver of corresponding on-site data gathering device signal, the bandpass filter that is used for the various noises of filtering and other wave filter by communication network, being used for signal behind the various noises of filtering and the waveform comparator that the thresholding waveform that is stored in central data processor compares are formed.

Described central server is provided with special purpose interface to carry out communication with user SCADA system and is connected.

Described communication network is specific satellite network or dedicated fibre optical network or VPN or CDMA or general packet radio service.

Advantage of the present utility model is the use of data acquisition unit at the scene, can reduce cost greatly, and when Data Update, only need upgrade and get final product the data in the central server, can save the working time greatly, the utility model can use existing communication network in addition, further reduces cost relatively.

Description of drawings

Fig. 1 is the structural representation of existing acoustic wave leakage detecting and positioning device;

Fig. 2 is the structural representation of the utility model acoustic wave leakage detecting and positioning device;

Fig. 3 is the structural drawing of the on-site data gathering device in the utility model device;

Fig. 4 is the structural drawing of the central server in the utility model device;

Fig. 5 is signal processing flow figure in the central server.

Embodiment

For architectural feature of the present utility model and effect thereof are had further understanding, enumerate specific embodiment now and be described with reference to the accompanying drawings as follows.

Shown in Figure 2 is the structural drawing of the utility model gas oil pipe leakage detection and location device, comprise a plurality of acoustic sensors 1 (1-1---1-n) that are arranged on the pipeline, a plurality of on-site data gathering devices 5 (5-1---5-n), central server 3 and communication network, described a plurality of acoustic sensor 1 is laid on the long defeated pipe 4 at a certain distance, described on-site data gathering device 5 (as shown in Figure 3), comprise: prime amplifier 51, simulating signal is to digital signal (A/D) converter 52, timing data acquisition module and communication module 54, wherein

Prime amplifier 51 in the on-site data gathering device 5 connects acoustic sensor 1, the simulated sound wave signals that acoustic sensor 1 is gathered is amplified, normally the magnitude of current amplifies and converts voltage signal to, and its output terminal connects A/D converter by the timing data acquisition module; Described A/D converter is converted to simulated sound wave signals manageable digital signal and sends central server 3 to by communication network.

Described simulated sound wave signals will be finished analog to digital conversion by the timing data acquisition module with certain frequency.

Described simulated sound wave signals sample frequency can be adjusted in certain dynamic range; But multi-channel data need guarantee strict synchronism, so that central server goes out the position of leakage point according to each check point signal lag Time Calculation.

Fig. 4 is the structural drawing of the central server in the utility model device.Central server is responsible for receiving in real time the data that each data collection station node sends, and pipeline is monitored in real time.Its major function is:

Communication: the communication channel of setting up and safeguard each data collection station;

Data acquisition is synchronous: gather also the raw data of each data collection station synchronously;

Data backup: preserve raw data;

Real-time leakage monitoring: the data that each data collection station node is obtained send processing module to and carry out real-time leakage monitoring, judge whether to leak;

Leak condition daily record: when system takes place to leak, information such as the time of leaking generation, place, leakage pore size are saved in database;

The system state service: the maintenance system duty, and send the condition monitoring main frame to.

As shown in Figure 4, central server 3 comprises a plurality of shunt data processors 31 and central data processor 32, each shunt data processor 31 is by the signal of communication network acceptance from corresponding on-site data gathering device 5, compare through filtering and known thresholding waveform, if surpass the thresholding waveform, show to have to leak and take place.And send central data processor 32 with leakage signal, the signals of data processor carry out analysis-by-synthesis along separate routes, leak position, leak sizes are determined in computing from each for 32 pairs of central data processor, and by display show, alarm equipment alarm.

Data processor 31 is made up of the receiver of accepting network signal, bandpass filter, waveform comparator and other wave filter along separate routes, its effect is to compare by waveform, real-time detects incident of leakage from the sound wave signal, and filter out most noise signal, as normal pipe operations or the like.To Leak Detection performance requirement Leak Detection rate: 100%; Rate of false alarm: be not more than 1 time/year.Detailed process is: accept signal from corresponding on-site data gathering device by receiver by communication network, go into the waveform comparer and compare through bandpass filter and the various noises of other wave filter filtering are laggard, then signal is sent central data processor 32 when the signal from on-site data gathering device 5 surpasses the thresholding waveform with the thresholding waveform that is stored in the central server 3.

32 pairs of central data processor are leaked the aperture and are estimated, by the intensity and the waveform of sound wave, and the real-time size of leaking the aperture that estimates.

Central data processor 32 arrives the delay inequality of each sensor by sound wave, real-time orients the position that incident of leakage takes place.

Central data processor 32 is provided with special purpose interface and user monitoring configuration software (SCADA, Supervisory Control And Data Acquisition) system carries out communication, when leaking generation, user SCADA system can be according to leakage monitoring positioning system state, carry out valve-off, operations such as warning.

The effect of described communication network is a communication channel of setting up and safeguard each data collection station; Gather the virgin state data of also synchronous each data collection station; In time preserve the virgin state data; Distributed terminal node data in real time is transferred to the signal Processing central server.Described communication network can be: specific satellite network or dedicated fibre optical network or VPN (VPN, Virtual Private Network) or CDMA (CDMA, Code Division Multiple Access) or general packet radio service (GPRS, General Packet Radio Service).Because what adopt all is prior art, therefore no longer describe in detail.

When adopting the specific satellite network, each data collection station is provided with global positioning system GPS (GPS, GlobalPositioning System) multinode data simultaneous module, GPS module and interface thereof cooperate NTP (NetworkTime Protocol) system of finishing to reach the microsecond level, even the accurate time service of nanosecond, thereby system clock is synchronous between the assurance distributed node.

After data collection station powers up, will automatically each state of terminal be diagnosed, and the real-time state terminal sends to master server.Need the SOT state of termination of automatic diagnosis to comprise: the data acquisition channel state; The GPS state; The communication module state; The conversational communication state.

After the diagnosis of data collection station completion status, show by the light emitting diode (LED, Light Emitting Diode) that is arranged on the data collection station.Need the data presented SOT state of termination to comprise: the data acquisition channel state; The GPS state; The communication module state; The conversational communication state.

Claims

1, a kind of acoustic wave leakage detecting and positioning device, comprise a plurality of acoustic sensors that are arranged on the pipeline, a plurality of on-site data gathering device, central server and communication network, it is characterized in that: described on-site data gathering device comprises: prime amplifier, simulating signal are to digital signal converter, timing data acquisition module and communication module, wherein:

2, acoustic wave leakage detecting and positioning device according to claim 1 is characterized in that: described shunt data processor is by accepting from the receiver of corresponding on-site data gathering device signal, the bandpass filter that is used for the various noises of filtering and other wave filter by communication network, being used for signal behind the various noises of filtering and the waveform comparator that the thresholding waveform that is stored in central data processor compares are formed.

3, acoustic wave leakage detecting and positioning device according to claim 1 is characterized in that: described central server is provided with special purpose interface to carry out communication with user SCADA system and is connected.

4, acoustic wave leakage detecting and positioning device according to claim 1 is characterized in that: described communication network is specific satellite network or dedicated fibre optical network or VPN or CDMA or general packet radio service.