A frequency-domain-based detection method for liquid pipeline leakage and fouling
A technology of transportation pipeline and detection method, which is applied in the direction of pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., which can solve the problems of slow detection speed, limited application, complex system hardware and software, etc., and achieve wide detection distance, The effect of small positioning error and easy miniaturization
Active Publication Date: 2017-11-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Although there are many detection methods in liquid transportation pipelines, these detection methods are not universally applicable
For example, the accuracy of the mechanical internal detection is not enough and there is a contact with the pipeline, which is far from meeting the demand; the internal detection of magnetic flux leakage needs to magnetize the pipeline, which actually limits the material of the pipeline to be detected, and also has requirements for the magnetic properties of the transmission medium; eddy current Due to the limitation of its principle, the detection speed is slow and the corresponding hardware system is also relatively complicated; the coupling problem between the transmission medium and the pipeline material exists in the ultrasonic internal detection, which makes it sensitive to the transmission medium; although the electromagnetic ultrasonic internal detection can better solve the problem of ultrasonic internal The detection is sensitive to the medium, but this method is only effective within 1mm from the detection pipeline, which greatly limits its application, and because the system detects pipeline damage by transmitting / receiving ultrasonic waves, the system hardware and software are more complicated ; Optical imaging internal detection is basically unusable in oily turbid liquids, and there are also problems requiring light sources and complex hardware systems
[0004] The above-mentioned traditional in-pipe detection methods generally have problems such as complex hardware, high power consumption, and sensitivity to detection objects, which have severely restricted the development of online, long-distance, and miniaturized internal detection devices (automatic internal detection robots)
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0062] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.
[0063] A detection method for leakage and fouling of liquid conveying pipelines based on frequency domain, the method is based on an active electric field detection device in liquid conveying pipelines.
[0064] (1) Detection device in the active electric field liquid conveying pipeline
[0065] Such as figure 1 As shown, the internal detection device includes an active electric field emission device 1 , an electric field change detection device 2 , a data sampling device 3 , a data processor 4 and a probe holder 5 .
[0066] The active electric field emission device 1 includes a signal generator 1-1 and an emission electrode 1-2.
[0067] Further, the signal generator 1-1 is used to generate a sine wave signal within 2000HZ as an excitat...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for detecting leakage and fouling of a liquid delivery pipeline based on a frequency domain. A signal generator is controlled by a data processor to generate an excitation signal required for detection. A receiving circuit detects a potential difference signal on a receiving electrode in real time, and sends The potential difference signal is transmitted to the data sampling device, and the data sampling device regularly collects the potential difference signal transmitted by the receiving electrode, and performs Fourier transform on the collected potential difference signal to generate a positioning curve. When the probe moves near the defect point, the defect point will have an impact on the electric field , so that the potential difference received by the receiving electrode changes, the defect of the pipeline is detected through the change of the positioning curve, and the defect can be located by the relative position of the probe and the defect point in the positioning curve. The method of the invention is widely used, and is especially suitable for internal detection of liquid conveying pipelines such as crude oil, refined oil, industrial dangerous liquid, sewage or conductive media containing pollutants in harsh working environments.
Description
technical field [0001] The invention relates to the field of detection of fluid conveying pipelines, in particular to a method for detecting leakage and fouling damage of liquid conveying pipelines due to corrosion, fouling, manufacturing defects, mechanical damage, bad weather, natural disasters and other reasons during use. A method for internal detection of defects. Background technique [0002] Pipeline transportation is one of the five transportation methods following railway transportation, road transportation, waterway transportation, and air transportation, and has become the most important transportation method for crude oil, refined oil, gas, steam and industrial hazardous media. Liquid transportation pipeline is the most important transportation mode of crude oil, refined oil and industrial dangerous liquid medium in petrochemical industry. In a fluid transmission system, piping is an essential element for transmitting fluid power. Liquid transportation pipeline...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityPatents(China)
IPC IPC(8): F17D5/06
CPCF17D5/06
Inventor彭杰钢刘露
OwnerUNIV OF ELECTRONICS SCI & TECH OF CHINA