CN210294056U - Optical path adjustable pipeline section phase content rate detecting system - Google Patents
Optical path adjustable pipeline section phase content rate detecting system Download PDFInfo
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- CN210294056U CN210294056U CN201921264027.6U CN201921264027U CN210294056U CN 210294056 U CN210294056 U CN 210294056U CN 201921264027 U CN201921264027 U CN 201921264027U CN 210294056 U CN210294056 U CN 210294056U
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Abstract
The utility model provides a pipeline section phase content rate detection system with adjustable optical path, which comprises a pipeline device, an optical path adjusting device, a light source emitter and a signal receiving device; the pipeline device comprises an organic glass pipeline positioned in the middle, and a large-caliber pipe, a transition conical pipe and a small-caliber pipe which are sequentially connected to the two ends of the organic glass pipeline; the light path adjusting device comprises a first light guide mirror arranged on the front side of the organic glass pipeline, a second light guide mirror arranged on the rear side of the organic glass pipeline, a first free-form surface reflector arranged on the lower side of the organic glass pipeline and a second free-form surface reflector arranged on the upper side of the organic glass pipeline; the light source emitter is positioned on the front side of the first light guide mirror and used for emitting visible light and near infrared light. The utility model discloses simple structure has realized the free adjustment of light path, has increased the optical path, has improved the SNR to improve measurement accuracy, can realize real-time on-line measuring.
Description
Technical Field
The utility model relates to a gas-liquid two-phase flow detects technical field, and specifically speaking relates to an optical distance adjustable pipeline cross-section looks percentage of content detecting system.
Background
The gas-liquid two-phase flow is widely applied to industries such as electric power, coal, metallurgy, petroleum, chemical engineering and the like. The phase content is one of important parameters of gas-liquid two-phase flow, and real-time and on-line measurement of the phase content plays an important role in real-time control, safe operation, on-line detection and the like of a gas-liquid two-phase flow system.
The method mainly comprises the following steps that firstly, on the basis of a large number of experimental researches, a calculation model is deduced through theoretical knowledge and experience; and secondly, measuring the split-phase content by using an instrument. The main measurement methods at present are: rapid opening and closing valve methods, direct measurement methods, radiation absorption methods, electrical methods and optical methods. The quick valve opening and closing method is accurate and effective, is mainly used for calibrating a measuring device and measuring the average section gas content of a pipeline in a laboratory, but the method can cut off the normal flow of fluid when measuring, so that the phase content of the pipeline cannot be measured on line and in real time. The direct measurement method is simple and convenient, and is manually or directly observed and measured by using equipment, but hardware support is provided for the direct measurement method by computer technology and camera technology, and the cost is high. The radiation absorption method is a phenomenon that when radiation penetrates a mixed fluid, signals are absorbed by the fluid to generate exponential attenuation, but a radiation absorption method sensor is expensive in manufacturing cost, and has safety problems related to radiation operation in a measuring process. The electrical method is an important method for measuring the phase fraction by measuring the relationship between the distribution of each phase and the electrical impedance, but is easily influenced by the flow pattern, so that more factors influencing the gas fraction of the section are provided. In addition, the optical method based on visible light has certain limitation on the measured medium, the cleanliness of the use occasion is required to be high, the measured medium can transmit the visible light, and the transmitting and receiving elements are easy to be polluted, so that the application range of the medium is limited.
In addition to the above-described methods for measuring the phase fraction, there are also methods for measuring based on infrared detection techniques. Such as an infrared moisture measuring device, an infrared detecting device for gas-liquid two-phase flow analysis, an infrared three-point detecting device for oil content in gas, and a device for detecting gas-liquid two-phase flow pattern by infrared. The near-infrared light measurement technology does not need sampling and sample pretreatment, and has obtained preliminary exploration research in the field of two-phase flow detection, but reports on real-time online measurement of the phase content of the pipeline section with adjustable optical path are rarely seen at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an optical path adjustable pipeline cross section looks occupancy detecting system to solve the problem that current system can not be accurate real-time, developments carry out the measurement to the cross section looks occupancy of gas-liquid two-phase flow.
The utility model aims at realizing through the following technical scheme: a pipeline section phase content rate detection system with an adjustable optical path comprises a pipeline device, an optical path adjusting device, a light source emitter and a signal receiving device;
the pipeline device is used for circulating fluid to be measured and comprises an organic glass pipeline positioned in the middle, and a large-caliber pipe, a transition conical pipe and a small-caliber pipe which are respectively connected to two ends of the organic glass pipeline in sequence, wherein the wide-mouth end of the transition conical pipe is connected with the corresponding large-caliber pipe, and the narrow-mouth end of the transition conical pipe is connected with the corresponding small-caliber pipe;
the optical path adjusting device comprises a first free-form surface reflector arranged on the lower side of the organic glass pipeline, a second free-form surface reflector arranged on the upper side of the organic glass pipeline, a first light guide mirror arranged on the front side of the organic glass pipeline and a second light guide mirror arranged on the rear side of the organic glass pipeline, wherein the concave mirror surfaces of the first free-form surface reflector and the second free-form surface reflector are opposite, the first light guide mirror is used for guiding incident light into the first free-form surface reflector, the first free-form surface reflector and the second free-form surface reflector are used for continuously reflecting signal light, so that the signal light passes through the organic glass pipeline for multiple times, and the second light guide mirror is used for guiding emergent light into the signal receiving device;
the light source emitter is positioned on the front side of the first light guide mirror and used for emitting visible light and near infrared light;
the signal receiving device comprises a focusing lens and a photoelectric detector, wherein the photoelectric detector is used for receiving the optical signal absorbed by the fluid and converting the optical signal into an electric signal.
The first light guide mirror and the second light guide mirror are plane reflectors and are arranged at preset positions through adjustable supports.
The first free-form surface reflector and the second free-form surface reflector are arranged at preset positions through adjustable supports.
The detection system comprises a data acquisition and processing device, the data acquisition and processing device comprises a data acquisition card and a computer, and the data acquisition card acquires data of the photoelectric detector and transmits the data to the computer for data processing and analysis.
The visible light is monochromatic laser light.
The utility model discloses the mode that combines transparent organic glass pipeline, visible light, near infrared light and free-form surface speculum for the first time measures the cross-section phase content rate of the gas-liquid two-phase flow in the pipeline, and this kind of method can effectual increase optical path, realizes more accurate, reliable measurement, provides an effectual technological means for measuring the cross-section phase content rate of the gas-liquid two-phase flow in the pipeline.
Compared with the existing measuring system and measuring method, the advantages are embodied in three aspects: firstly, a focusing lens is used for carrying out light ray convergence, so that the signal intensity is increased, the signal to noise ratio is improved, and the measurement accuracy is increased; secondly, the transmission condition of the light path in the pipeline can be observed by utilizing a visible light visualization system, so that the adjustment of the light path is convenient, and a basis and a guarantee are provided for measuring the section phase content of the gas-liquid two-phase flow by using the near infrared light; and thirdly, the free-form surface reflector structure can adjust the angle of incident light, so that the light is reflected for multiple times, the light path covers the whole pipeline section, the effects of increasing the light path and increasing the signal-to-noise ratio are achieved, and the section phase content of the gas-liquid two-phase flow is measured more accurately.
The utility model discloses a measuring method has realized the free adjustment of light path, has increased the optical path, has reduced the detection limit, has increased signal strength, has improved the SNR to measurement accuracy and degree of accuracy have been improved. And the utility model discloses device simple structure also will fall to the influence that the manifold caused to the influence minimum when carrying out accurate measurement, more is close with practical application, has improved measuring credibility, can realize real-time on-line measuring.
In addition, the detection system for the cross-sectional phase content of the gas-liquid two-phase flow in the pipeline with the adjustable optical path can research the attenuation characteristic of visible light in gas and liquid, and therefore, an auxiliary comparison and reference can be made for near infrared light, and the development of the near infrared spectrum technology is further promoted.
Drawings
Fig. 1 is a schematic structural diagram of the detection system of the present invention. In the figure, arrows indicate the flow direction of the fluid to be measured, and broken lines indicate the positions of the cross sections of the optical paths.
Fig. 2 is the schematic structural diagram of the light path adjusting device of the present invention.
In the figure: 1-small bore pipe; 2-transition conical tube; 3, a large-caliber pipe; 4-organic glass pipe; 5-light source emitter; 6, a first light guide mirror; 7-a second light guide lens; 8-a focusing lens; 9-a photodetector; 10-a computer; 11-a first free-form surface mirror; 12-second free-form surface mirror.
Detailed Description
As shown in fig. 1 and fig. 2, the detection system of the present invention includes a pipe device, a light path adjusting device, a light source emitter, and a signal receiving device.
The pipeline device sequentially comprises a small-caliber pipe 1, a transition conical pipe 2, a large-caliber pipe 3, an organic glass pipeline 4, a large-caliber pipe 3, a transition conical pipe 2 and a small-caliber pipe 1 from left to right, wherein the organic glass pipeline 4 is a cylindrical transparent pipeline, and the connecting parts of the pipelines are matched in size and are in sealing connection.
The inner diameter of the small-caliber pipe is D1=50mm, length of tube body L1=80mm, wall thickness of tube bodyIs 2 mm; the length of the transition conical tube is L2=65 mm; the inner diameter of the pipe body with the large caliber is D2=80mm, length of tube body L3=45mm, the wall thickness of the tube body is 2 mm; the inner diameter of the organic glass pipeline body is D3=80mm, and the outer diameter of the pipe body is D4=82mm, length of tube body L4=145mm, the wall thickness of the tube body is 2 mm; the optical path range of the first free-form surface reflector and the second free-form surface reflector is 4.4-35 m.
The light path adjusting device comprises a first light guide mirror 6 arranged on the front side (corresponding to the left side in the figure 2) of the organic glass pipeline, a second light guide mirror 7 arranged on the rear side (corresponding to the right side in the figure 2) of the organic glass pipeline, a first free-form surface reflector 11 arranged on the lower side of the organic glass pipeline and a second free-form surface reflector 12 arranged on the upper side of the organic glass pipeline. The first free-form surface reflector 11 is opposite to the concave mirror surface of the second free-form surface reflector 12, and the first free-form surface reflector 11 and the second free-form surface reflector 12 are arranged at preset positions through adjustable supports. The first light guide mirror 6 and the second light guide mirror 7 are both plane reflectors (the support can be finely adjusted) and are arranged above the corresponding side of the organic glass pipeline 4. The light source emitter 5 is located on the front side of the first light guide mirror 6, and emits visible light or near infrared light. The signal receiving device is located at the rear side of the second light guide mirror 7 and sequentially comprises a focusing lens 8 and a photoelectric detector 9, and the photoelectric detector 9 is used for receiving the optical signal absorbed by the fluid and converting the optical signal into an electrical signal.
The fluid to be measured flows through the small-caliber pipe 1, the transition conical pipe 2 and the large-caliber pipe 3 from one side and then flows to the organic glass pipeline 4, the incident light horizontally enters the first light guide mirror 6 and then is reflected between the two free-form surface reflecting mirrors, after a plurality of reflections, a light path section (shown in figure 2) capable of covering the pipeline section is formed on the organic glass pipeline 4, after the fluid flows through the section, the near infrared light is partially absorbed by the fluid, and therefore the light intensity of the fluid is weakened. The position of the photodetector 9 and the focusing lens 8 is fixed so that it can detect the light intensity at the best position. The photodetector 9 can receive the light intensity signal absorbed by the fluid and convert the light intensity signal into an electric signal, and finally, the computer 10 is used for processing and analyzing the data, and the conventional analysis method can be adopted for the processing and the analysis of the data.
The first free-form surface reflector 11, the second free-form surface reflector 12, the first light guide mirror 6 and the second light guide mirror 7 are arranged in the same plane, so that signal light is reflected for multiple times in the same cross section, accurate transmission of the light path is guaranteed, light path adjustment is convenient to carry out according to different detection requirements, the light path can be adjusted in advance by utilizing the available light, and then near infrared light is used for detection. The specific detection steps are as follows:
a. setting the detection system;
b. optical path adjustment: the light source emitter 5 is made to emit visible light, which is monochromatic laser light. Adjusting the positions of the first light guide mirror 6, the second light guide mirror 7, the first free-form surface reflector 11 and the second free-form surface reflector 12 to enable the signal light to be continuously reflected between the first free-form surface reflector 11 and the second free-form surface reflector 12, so that the signal light passes through the same section of the organic glass pipeline 4 for a plurality of times, and meanwhile, emergent light can be received by the photoelectric detector 9;
c. detecting the phase content of the cross section: introducing a fluid to be detected into the pipeline device, so that the light source emitter 5 emits near infrared light, the near infrared light passes through the same section of the organic glass pipeline 4 for a plurality of times along the adjusted light path and is absorbed by the fluid to be detected, and the light intensity is attenuated to a certain extent;
d. the emergent convergent light is detected by a photoelectric detector 9, the detected data is collected by a data collection card and transmitted to a computer, and finally the section phase content rate is calculated according to the transmitted data.
The specific size parameters of the two-sided free-form surface reflector and the light guide mirror can be determined according to the actual size condition of the pipeline. The detection is simple and convenient to operate, can carry out real-time online detection, and is suitable for popularization and application.
Claims (4)
1. A pipeline section phase content rate detection system with an adjustable optical path is characterized by comprising a pipeline device, an optical path adjusting device, a light source emitter and a signal receiving device;
the pipeline device is used for circulating fluid to be measured and comprises an organic glass pipeline positioned in the middle, and a large-caliber pipe, a transition conical pipe and a small-caliber pipe which are respectively connected to two ends of the organic glass pipeline in sequence, wherein the wide-mouth end of the transition conical pipe is connected with the corresponding large-caliber pipe, and the narrow-mouth end of the transition conical pipe is connected with the corresponding small-caliber pipe;
the optical path adjusting device comprises a first free-form surface reflector arranged on the lower side of the organic glass pipeline, a second free-form surface reflector arranged on the upper side of the organic glass pipeline, a first light guide mirror arranged on the front side of the organic glass pipeline and a second light guide mirror arranged on the rear side of the organic glass pipeline, wherein the concave mirror surfaces of the first free-form surface reflector and the second free-form surface reflector are opposite, the first light guide mirror is used for guiding incident light into the first free-form surface reflector, the first free-form surface reflector and the second free-form surface reflector are used for continuously reflecting signal light, so that the signal light passes through the organic glass pipeline for multiple times, and the second light guide mirror is used for guiding emergent light into the signal receiving device;
the light source emitter is positioned on the front side of the first light guide mirror and used for emitting visible light and near infrared light;
the signal receiving device comprises a focusing lens and a photoelectric detector, wherein the photoelectric detector is used for receiving the optical signal absorbed by the fluid and converting the optical signal into an electric signal.
2. The system for detecting the phase fraction of the pipeline with the adjustable optical path according to claim 1, wherein the first light guide mirror and the second light guide mirror are both plane mirrors and are both arranged at predetermined positions by adjustable supports.
3. The system for detecting the phase fraction of a pipeline with an adjustable optical path length as claimed in claim 1, wherein the first free-form surface reflector and the second free-form surface reflector are disposed at predetermined positions by adjustable supports.
4. The system as claimed in claim 1, wherein the detection system comprises a data acquisition and processing device, the data acquisition and processing device comprises a data acquisition card and a computer, and the data acquisition card acquires data from the photodetector and transmits the data to the computer for processing and analyzing the data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921264027.6U CN210294056U (en) | 2019-08-06 | 2019-08-06 | Optical path adjustable pipeline section phase content rate detecting system |
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| CN201921264027.6U CN210294056U (en) | 2019-08-06 | 2019-08-06 | Optical path adjustable pipeline section phase content rate detecting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346324A (en) * | 2019-08-06 | 2019-10-18 | 河北大学 | A kind of adjustable pipeline section measuring of phase ratio system and method for light path |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346324A (en) * | 2019-08-06 | 2019-10-18 | 河北大学 | A kind of adjustable pipeline section measuring of phase ratio system and method for light path |
| CN110346324B (en) * | 2019-08-06 | 2023-11-14 | 河北大学 | System and method for detecting phase content of pipeline section with adjustable optical path |
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