CN110441239B - Optical path-adjustable pipeline phase content rate detection system and method - Google Patents
Optical path-adjustable pipeline phase content rate detection system and method Download PDFInfo
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- CN110441239B CN110441239B CN201910722777.1A CN201910722777A CN110441239B CN 110441239 B CN110441239 B CN 110441239B CN 201910722777 A CN201910722777 A CN 201910722777A CN 110441239 B CN110441239 B CN 110441239B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a system and a method for detecting the phase content rate of a pipeline with an adjustable optical path, wherein the system 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 concave reflecting mirror and a third concave reflecting mirror which are arranged on the lower side of the organic glass pipeline, and a first light guide mirror, a second concave reflecting mirror and a second light guide mirror which are sequentially arranged on the upper side of the organic glass pipeline; the first concave reflector and the third concave reflector are symmetrically arranged on two sides of the central axis of the second concave reflector; the light source emitter is used for emitting visible light and near infrared light. The invention has simple structure, realizes free adjustment of the optical path, increases the optical path and improves the signal-to-noise ratio, thereby improving the measurement accuracy and realizing real-time online detection.
Description
Technical Field
The invention relates to the technical field of gas-liquid two-phase flow detection, in particular to a system and a method for detecting the phase content of a pipeline with an adjustable optical path.
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.
There are many kinds of current structures for measuring the phase content of gas-liquid two-phase flow, and the reports mainly include: firstly, the most common round pipe is adopted, and the probe is placed along the radial direction of the measuring pipeline to measure the phase content. The circular organic glass pipeline has radian, laser can generate refraction when irradiating the outer wall of the organic glass, and also generates refraction and reflection when penetrating through the interface between the organic glass and fluid, so that a probe of a receiving device cannot completely receive an attenuated optical signal, the measurement uncertainty is large, and the measurement result is greatly influenced; secondly, a gas-liquid two-phase flow phase content rate detection device for measuring along the flow direction of the two-phase flow is designed on the horizontal pipeline, the original mode of radial placement and measurement of the probe is changed into the mode of measuring along the flow direction of the fluid, the capability of receiving signals by the corresponding receiving probe is improved, and the aim of accurate measurement is fulfilled; and thirdly, a plurality of groups of transmitting probes and receiving probes form a unified whole, the integrity of information received by the infrared receiving probe along the axial direction is increased, and the near-infrared receiving and transmitting probes are used for detecting gas-liquid two-phase flow in the horizontal and vertical flow directions, so that the aim of more accurate measurement is fulfilled. The detection operation is complex, the optical path is limited and inconvenient to adjust, and real-time online detection is difficult to realize.
The design of the structure uses near infrared light measurement, the near infrared laser measurement technology does not need sampling and sample pretreatment, preliminary exploration research is obtained in the field of two-phase flow detection, but the two-phase flow medium interface is complex and changeable, and meanwhile, the measurement accuracy is not ideal due to the invisible naked eye of near infrared light.
Disclosure of Invention
The invention aims to provide a pipeline phase content rate detection system with an adjustable optical path, which aims to solve the problem that the existing system has deviation of a measurement result due to low signal-to-noise ratio caused by limited optical path.
The second purpose of the present invention is to provide a method for detecting the phase content of a pipeline with an adjustable optical path.
One of the purposes of the invention is realized by the following technical scheme: a pipeline phase content rate detection system with an adjustable optical path comprises a pipeline device, an optical path adjusting device, a light source transmitter 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 light path adjusting device comprises a first concave reflecting mirror and a third concave reflecting mirror which are arranged on the lower side of the organic glass pipeline, and a first light guide mirror, a second concave reflecting mirror and a second light guide mirror which are sequentially arranged on the upper side of the organic glass pipeline; the first concave reflector and the third concave reflector are symmetrically arranged on two sides of the central axis of the second concave reflector; the first light guide mirror is used for guiding incident light into the first concave reflector, and signal light is guided into the signal receiving device by the second light guide mirror after being continuously reflected by the first concave reflector, the second concave reflector and the third concave reflector in sequence;
the light source emitter is 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 both plane reflectors and are respectively arranged at preset positions through adjustable supports.
The first concave reflecting mirror, the second concave reflecting mirror and the third concave reflecting mirror are arranged at preset positions through adjustable supports respectively.
The pipeline devices are all rectangular pipes.
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 second purpose of the invention is realized by the following technical scheme: a method for detecting the phase content rate of a pipeline with an adjustable optical path comprises the following steps:
a. setting the detection system;
b. optical path adjustment: enabling the light source emitter to emit visible light, and adjusting the positions of the first light guide mirror, the second light guide mirror, the first concave reflector, the second concave reflector and the third concave reflector to enable signal light to be continuously reflected by the first concave reflector, the second concave reflector and the third concave reflector in sequence, so that the signal light penetrates through the organic glass pipeline for a plurality of times, and emergent light can be received by the photoelectric detector;
c. detecting the phase content of the pipeline: introducing a fluid to be detected into the pipeline device, enabling the light source emitter to emit near infrared light, enabling the near infrared light to pass through the organic glass pipeline for a plurality of times along the adjusted light path and be partially absorbed by the fluid to be detected, and receiving a near infrared light signal absorbed by the fluid to be detected by the photoelectric detector and converting the near infrared light signal into an electric signal;
d. and obtaining the pipeline phase content rate after data processing and analysis.
The visible light is monochromatic laser light.
The method firstly combines the transparent organic glass pipeline, the visible light, the near infrared light and the concave reflector group to measure the phase content of the gas-liquid two-phase flow in the pipeline, can effectively increase the optical path, realizes more accurate and reliable measurement, and provides an effective technical means for measuring the phase content 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 improved; secondly, the transmission 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 guarantee are provided for measuring the phase content of the gas-liquid two-phase flow by using near infrared light; and thirdly, the concave reflector structure is combined with the rectangular pipeline, so that light is reflected for multiple times, the light path is adjustable, the refraction times of the light when irradiating the outer wall of the organic glass are reduced, and the detection result is more accurate.
The measuring method of the invention realizes the free adjustment of the optical path, increases the optical path, reduces the detection limit, increases the signal intensity, and improves the signal to noise ratio, thereby improving the measuring accuracy. The device has simple structure, reduces the influence on the flow form to the minimum while carrying out accurate measurement, is closer to the practical application, improves the reliability of the measurement and can realize real-time online detection.
In addition, the detection system for the phase content of the gas-liquid two-phase flow in the pipeline with the adjustable optical path can help to 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 a detection system according to the present invention. The arrows in the figure indicate the direction of flow of the fluid to be measured.
In the figure: 1-small bore pipe; 2-transition conical tube; 3, a large-caliber pipe; 4-organic glass pipe; 5-a first concave mirror; 6-a second concave mirror; 7-a third concave mirror; 8, a first light guide mirror; 9-a second light guide lens; 10-a light source emitter; 11-a focusing lens; 12-a photodetector; 13-computer.
Detailed Description
As shown in fig. 1, the detection system of the present invention includes a pipe device, a light path adjusting device, a light source emitter, a signal receiving device, and a data collecting and processing device.
The pipe device is from left to right small-bore pipe 1, transition conical tube 2, heavy-calibre pipe 3, organic glass pipeline 4, heavy-calibre pipe 3, transition conical tube 2, small-bore pipe 1 in proper order, and organic glass pipeline 4 is the rectangle transparent pipeline, and the mouth of pipe of other each pipeline is the rectangle, and junction size phase-match and sealing connection.
The structure is used for detecting the phase content rate of the pipeline with the adjustable optical path, and the inner diameter of the pipe body with a small caliber is D1=50mm, length of tube body L1=80mm, the wall thickness of the tube body is 2 mm; the length of the pipe body of the transition conical pipe 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 first concave surface is reflectiveThe optical path ranges achievable by the mirror, the second concave mirror, and the third concave mirror are 4.4-35 m.
The light path adjusting device comprises a first concave reflector 5 and a third concave reflector 7 which are arranged on the lower side of the organic glass pipeline, and a first light guide mirror 8, a second concave reflector 6 and a second light guide mirror 9 which are sequentially arranged on the upper side of the organic glass pipeline; the first concave reflector 5, the second concave reflector 6 and the third concave reflector 7 are all concave mirror surfaces facing the organic glass pipeline 4, the sizes and radians of the first concave reflector 5 and the third concave reflector 7 are completely the same and are symmetrically arranged on two sides of the central axis of the second concave reflector 6, and the size of the second concave reflector is larger than that of the first concave reflector 5 and the third concave reflector 7 so as to adjust the optical distance; the first light guide mirror 8 is used for guiding incident light into the first concave reflecting mirror 5, and signal light is guided into the signal receiving device by the second light guide mirror 9 after being continuously reflected by the first concave reflecting mirror 5, the second concave reflecting mirror 6 and the third concave reflecting mirror 7 in sequence; the first concave mirror 5, the second concave mirror 6 and the third concave mirror 7 are each set at a predetermined position by an adjustable bracket. The light source emitter 10 is located on the front side of the first light guide 8 and emits visible light or near infrared light. The signal receiving device is located at the rear side of the second light guide mirror 9 and sequentially comprises a focusing lens 11 and a photoelectric detector 12, and the photoelectric detector 12 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 8 and then is reflected between the concave surface reflecting mirrors and is continuously reflected, and when the fluid flows through the pipeline, the near infrared light is partially absorbed by the fluid, so that the light intensity of the fluid is weakened. The photodetector 12 and the focusing lens 11 are fixed in position so that it can detect the light intensity at the best position. The photodetector 12 can receive the light intensity signal absorbed by the fluid, convert the light intensity signal into an electrical signal, and finally process and analyze the data by using the computer 13, wherein the conventional analysis method can be adopted for the data processing and analysis.
The optical path can be adjusted according to different detection requirements, the optical path can be adjusted in advance by utilizing visible light, and then the 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 10 is caused to emit visible light, which is monochromatic laser light. Adjusting the positions of a first light guide mirror 8, a second light guide mirror 9, a first concave reflector 5, a second concave reflector 6 and a third concave reflector 7 to enable signal light to be continuously reflected by the first concave reflector 5, the second concave reflector 6 and the third concave reflector 7 in sequence, so that the signal light passes through the organic glass pipeline 4 for a plurality of times, and emergent light can be received by a photoelectric detector 12;
c. detecting the phase content of the pipeline: introducing the fluid to be detected into the pipeline device to enable the light source emitter 10 to emit near infrared light, wherein the near infrared light passes through the organic glass pipeline 4 for a plurality of times along the adjusted light path and is absorbed by the fluid to be detected, so that the light intensity is attenuated to a certain extent;
d. the emitted convergent light is detected by the photoelectric detector 12, the detected data is collected by the data collection card and transmitted to the computer, and finally the phase inclusion rate is calculated according to the transmitted data.
The size parameters of the concave reflecting mirror and the light guide mirror can be determined according to the actual size condition of the pipeline. The relative positions of the three concave mirrors are not changeable. The detection is simple and convenient to operate, the optical path can be adjusted according to actual requirements, real-time online detection can be achieved, and the method is suitable for popularization and application.
Claims (7)
1. A pipeline 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 light path adjusting device comprises a first concave reflecting mirror and a third concave reflecting mirror which are arranged on the lower side of the organic glass pipeline, and a first light guide mirror, a second concave reflecting mirror and a second light guide mirror which are sequentially arranged on the upper side of the organic glass pipeline; the first concave reflector and the third concave reflector are symmetrically arranged on two sides of the central axis of the second concave reflector; the first light guide mirror is used for guiding incident light into the first concave reflector, and signal light is guided into the signal receiving device by the second light guide mirror after being continuously reflected by the first concave reflector, the second concave reflector and the third concave reflector in sequence;
the light source emitter is 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 respectively arranged at predetermined positions through adjustable brackets.
3. The system for detecting the phase fraction of a pipeline with an adjustable optical path according to claim 1, wherein the first concave reflector, the second concave reflector and the third concave reflector are each disposed at a predetermined position by an adjustable bracket.
4. The system for detecting the phase fraction of the pipeline with the adjustable optical path as claimed in claim 1, wherein the pipeline devices are rectangular pipes.
5. The optical path adjustable pipeline phase fraction detection 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.
6. A method for detecting the phase content rate of a pipeline with an adjustable optical path is characterized by comprising the following steps:
a. providing a detection system according to any one of claims 1 to 5;
b. optical path adjustment: enabling the light source emitter to emit visible light, and adjusting the positions of the first light guide mirror, the second light guide mirror, the first concave reflector, the second concave reflector and the third concave reflector to enable signal light to be continuously reflected by the first concave reflector, the second concave reflector and the third concave reflector in sequence, so that the signal light penetrates through the organic glass pipeline for a plurality of times, and emergent light can be received by the photoelectric detector;
c. detecting the phase content of the pipeline: introducing a fluid to be detected into the pipeline device, enabling the light source emitter to emit near infrared light, enabling the near infrared light to pass through the organic glass pipeline for a plurality of times along the adjusted light path and be partially absorbed by the fluid to be detected, and receiving a near infrared light signal absorbed by the fluid to be detected by the photoelectric detector and converting the near infrared light signal into an electric signal;
d. and obtaining the pipeline phase content rate after data processing and analysis.
7. The method as claimed in claim 6, wherein the visible light is a monochromatic laser.
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| AU2011214172A1 (en) * | 2010-02-09 | 2012-08-30 | Duvas Technologies Limited | Optical absorption spectroscopy with multi-pass cell with adjustable optical path length |
| CN105547386A (en) * | 2015-12-22 | 2016-05-04 | 河北大学 | Device and method for measuring gas and liquid two-phase flow in horizontal pipeline |
| CN105628108A (en) * | 2015-12-22 | 2016-06-01 | 河北大学 | Device and method for measuring flow of gas-liquid two phase fluids in vertical pipeline |
| CN105910663A (en) * | 2016-04-06 | 2016-08-31 | 河北大学 | Device and method for measuring flow of gas-liquid two-phase flow |
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Non-Patent Citations (1)
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Application publication date: 20191112 Assignee: Hebei Youdi Technology Co.,Ltd. Assignor: HEBEI University Contract record no.: X2023980038989 Denomination of invention: A pipeline phase holdup detection system and method with adjustable optical path Granted publication date: 20210921 License type: Exclusive License Record date: 20230802 |