WO2020093740A1 - High-frequency wide-width laser scanning intelligent detection device and method - Google Patents

Abstract

A high-frequency wide-width laser scanning intelligent detection device and method, being mainly used for detecting liquid online quality. The detection device comprises a high-power laser generator (1); the high-power laser generator (1) is mounted on one end of a pipeline (5) loading liquid to be detected, and the inner wall of the other end of the pipeline (5) is provided with a photoelectric sensor (2); a modem (3) and a transmitter (4) are mounted on the outer wall of the pipeline (5) on the same side as the photoelectric sensor (2). By means of the intelligent detection device and method, the approximate range of the impurity content of said liquid can be determined, so as to determine the online quality of the liquid, so that metering of a liquid chemical product can be greatly improved in terms of quantity and quality control capabilities.

Description

High-frequency wide-width laser scanning intelligent detection device and method Technical field

The invention relates to a high-frequency wide-width laser scanning intelligent detection device and method, which is mainly used for the detection of online liquid quality.

Background technique

With the degree of industrialization and the improvement of people's living standards, the demand for liquid refined oil or liquid chemical raw materials is increasing. In order to store refined oil or liquid chemical raw materials, various storage tanks have been constructed in ports along the river and along the coast. In the process of refined oil trade, it is necessary to unload the refined oil transported by the ship into the storage tank, and use the mass flowmeter installed on the pipeline to complete the measurement of the refined oil while unloading. Because the refined oil loaded on the ship is inevitably doped with gas, the total amount of refined oil unloaded from the ship is inconsistent with the total amount of refined oil actually received by the storage tank. Therefore, the refined oil receiver and the shipper There have been handover disputes. Generally, the internationally accepted measurement error is less than 0.3% by default. However, in fact, batches with measurement error exceeding 0.3% account for 20% -30% of the total transaction batches.

At present, the measurement accuracy of the mass flowmeter used for the measurement of refined oil can reach 0.5 ‰, but the measurement accuracy is greatly reduced under the gas-liquid two-phase condition. At present, the possibility of using the degassing equipment to first remove the gas in the liquid and then measure it through a high-precision mass flow meter, but the degassing equipment that has been developed cannot completely eliminate the gas contained in the liquid, especially when the gas content gradually increases Large, even up to 100%, the getter effect is significantly reduced.

The authorized announcement number is: CN106289428B's patent, degassing device and metering system, which has overcome the international gas-liquid two-phase problems that high-end flowmeter products have faced for decades, thus making Emerson, Honeywell, ABB, E + H, Yokogawa The high-end flowmeters produced by well-known enterprises can be used for accurate measurement, and the design accuracy of the invented measurement system has reached one-thousandth of the standard; further, if online liquid quality detection can be achieved, the measurement of liquid chemical products will be in quantity And the quality control ability has been greatly improved.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, and to provide a high-frequency and wide-range laser scanning intelligent detection device and method.

The technical solution of the present patent to solve the above technical problems is as follows: a high-frequency and wide-range laser scanning intelligent detection device, including a high-power laser generator, which is installed on one side of the pipeline carrying the liquid to be detected and is used to emit A single laser beam repeatedly scanned within a range of angle α on the longitudinal section of the pipe, and a photoelectric sensor is provided on the inner wall of the other end of the pipe, and the photoelectric sensor is used to receive the emission of the high-power laser generator Single-beam laser and convert the change of light intensity into electrical signal, the outer wall of the pipeline on the same side as the photoelectric sensor is equipped with a modem and a transmitter, the modem and the transmitter are used to determine the single-beam laser penetration The current caused by the light intensity sensed by the photoelectric sensor through the liquid in the pipeline and the current caused by the light intensity induced by the photoelectric sensor when impurities are mixed in the liquid in the pipeline, and the current signal is derived.

Further, the range of α is 0-90 °.

Further, the range of α is 45-90 °.

Further, the photoelectric sensor, modem, and transmitter are all fixed to the pipeline by riveting screws.

The intelligent detection method of high-frequency wide-width laser scanning includes the following steps:

(1) A single laser beam emitted by the high-power laser generator is repeatedly scanned within a range of angle α on the longitudinal section of the pipeline;

(2) Set the frequency of repeated scanning of a single laser to F, the volumetric flow rate of the liquid in the pipe is V, the cross-sectional area of the pipe is S and the smallest detectable diameter of impurities in the liquid flowing in the pipe For D, match according to the following formula: F = (KV) / (SD), where K is the correction factor, and fine-tune according to the frequency attenuation or gain;

(3) When the modem and the transmitter measure the current I1 caused by the single beam of laser light passing through the liquid in the pipeline and the light intensity induced by the photoelectric sensor and the impurities mixed in the liquid in the pipeline The current I2 caused by the light intensity induced by the sensor, and the current signal is derived;

(4) The transmission power of the high-power laser generator is set according to the current I1 and the current I2;

(5) Set the volume flow rate of impurities mixed in the liquid in the pipeline to X, according to

Determine the volume flow of impurities.

Further, the α in the step (1) is determined according to the scanning frequency of the high-power laser generator, and the scanning frequency of the high-power laser generator is based on the uniformity of impurities contained in the liquid flowing in the pipeline The degree of distribution is adjusted. As the degree of uniform distribution increases, the scanning frequency decreases, and as the scanning frequency increases, the angle α increases.

Further, the value range of K in the step (2) is 0.9-1.2.

Further, the impurities in the step (2) are solid particles or bubbles.

The beneficial effect of this patent is that the present invention can determine the approximate range of the impurity content of the liquid to be detected, and thus realize the online quality judgment of the liquid, so that the quantitative and quality control capabilities of the measurement of liquid chemical products are greatly improved.

BRIEF DESCRIPTION

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the specific embodiments or the description of the prior art. Obviously, the attached The drawings are some embodiments of the present invention. For those of ordinary skill in the art, without paying any creative labor, other drawings can be obtained based on these drawings.

1 is a schematic structural diagram of an intelligent detection device for high-frequency wide-width laser scanning according to a specific embodiment of the present invention;

Reference mark:

1-High-power laser generator; 2-photoelectric sensor; 3-modem; 4-transmitter; 5-pipe; 6-rivet screw.

detailed description

The embodiments of the technical solution of the present invention will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly explain the technical solutions of the present invention, and therefore are only used as examples, and cannot be used to limit the protection scope of the present invention.

It should be noted that, unless otherwise stated, the technical terms or scientific terms used in this application should be in the ordinary meaning understood by those skilled in the art to which the invention belongs.

In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Rear "," Left "," Right "," Vertical "," Horizontal "," Top "," Bottom "," Inner "," Outer "," Clockwise "," Counterclockwise "," Axial ", The azimuth or positional relationship indicated by "radial", "circumferential", etc. is based on the azimuth or positional relationship shown in the drawings, only to facilitate the description of the present invention and simplify the description, rather than to indicate or imply the device or element It must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

In this application, unless otherwise clearly specified and limited, the terms "installation", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , Or integrated; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediary, it can be the connection between two components or the interaction between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

As shown in FIG. 1, the intelligent detection device for high-frequency and wide-range laser scanning provided by the present invention includes a high-power laser generator 1, which is installed on one side end of a pipe 5 carrying a liquid to be detected In order to emit a single laser beam that can be repeatedly scanned in the range of angle α on the longitudinal section of the pipe 5, a photoelectric sensor 2 is provided on the inner wall of the other end of the pipe 5, and the photoelectric sensor 2 is used to receive A single laser beam emitted by the high-power laser generator 1 converts the change in light intensity into an electrical signal, and a modem 3 and a transmitter 4 are installed on the outer wall of the pipeline 5 on the same side as the photoelectric sensor 2, The modem 3 and the transmitter 4 are used to measure the current caused by the light intensity induced by the single laser beam passing through the liquid in the pipeline 5 and hitting the photoelectric sensor 2, and the photoelectric sensor 2 when impurities are mixed in the liquid in the pipeline 5 The current caused by the induced light intensity, and the current signal is derived.

Further, the range of α is 0-90 °.

Further, the range of α is 45-90 °.

Further, the photoelectric sensor 2, the modem 3 and the transmitter 4 are all fixed to the pipeline 5 by riveting screws 6.

A high-power laser generator 1 is installed on the tube 5, and the single laser beam emitted can be repeatedly scanned in the range of angle α on the longitudinal section of the pipe 5, adjusted according to the uniform distribution of impurities contained in the liquid flowing in the pipe 5 , The adjustment range is from 0 ° to the maximum angle that the high-frequency laser generator 1 can change. The angle with a higher degree of uniformity can be smaller, preferably within the range of 45 ° to 90 °; It may be larger; the frequency of the high power laser generator 1, which emits a single laser beam that can be repeatedly scanned in the range of angle α on the longitudinal section of the pipe 5, its frequency F and the maximum volume flow V set by the liquid in the pipe 5 , The cross-sectional area S of the pipe 5 and the minimum detectable diameter D of the solid particles or bubbles in the liquid flowing in the pipe 5 are matched according to the following formula: F = KV / SD; K is the correction coefficient, K is 0.9- Between 1.2, fine-tuning according to frequency attenuation or gain; the value of angle α depends on the scanning frequency F of the high-power laser generator 1, the higher the frequency, the greater the angle α value, can it be scanned into the liquid Impurity depends The scanning frequency F of the high-power laser generator 1, the higher the degree of uniform distribution of impurities contained in the liquid flowing in the pipeline 5, the lower the scanning frequency F of the high-power laser generator 1, if the impurity scanning frequency F cannot be scanned It needs to be set larger. The scan frequency F and the estimated volume flow of impurities have no effect, but it determines whether the impurities can be scanned; the modem 3 and the transmitter 4 determine that the liquid in the pipe 5 is emitted by the laser beam. The current I1 caused by the light intensity induced by the photoelectric sensor 2 and the current I2 caused by the light intensity induced by the photoelectric sensor 2 when impurities are mixed in the liquid in the pipeline 5, and the current signal is derived; the high-power laser generator 1, its emission power It can be adjusted according to the current I1 caused by the light intensity induced by the laser beam passing through the liquid in the pipe 5 and hitting the photoelectric sensor 2 and the current I2 caused by the light intensity induced by the photoelectric sensor 2 when impurities are mixed in the liquid in the pipe 5, by ( I1-I2) / I1 is greater than or equal to the ratio of the volume flow rate X of the impurities mixed in the liquid in the pipeline 5 to the set volume flow rate V to obtain the approximate volume flow rate X of the impurities; high power When the diameter of the pipeline 5 is less than 100mm and the set working pressure is less than 1MPa, the light generator 1 and the photoelectric sensor 2 can be connected to the transparent glass tube as a window in the middle of the pipeline 5, and the high-power laser generator 1 and the photoelectric sensor 2 are set Outside the glass tube.

Example 1

The diameter of the pipeline 5 is set to D = 150 mm, the correction factor K = 1, the volume flow rate of the pipeline 5 is 600 m ³ / h, the accuracy of the measurement system connected to the pipeline 5 is one thousandth, and the smallest detectable in the pipeline 5 The diameter of the particles is 0.1 mm, the scanning range of the high-power laser generator 1 is set to an angle α equal to 90 °, and the scanning frequency of the high-power laser generator 1 is set to:

600m ³ /h÷(π×0.075×0.075)÷0.0001÷3600=9436Hz, the power of the high-power laser generator 1 can be set at about 50W-90W, so that the maximum volume flow in the pipeline 5 can be 600m ³ / h Evenly distributed bubbles and particles with a diameter of not less than 1mm in the liquid flowing through can be detected and can be based on

The size of is roughly to determine the range of the volume flow rate X of impurities.

Example 2

The diameter of the pipeline 5 is set to D = 50 mm, the correction factor K = 1, the volume flow rate of the pipeline 5 is 10 m ³ / h, the accuracy of the measurement system connected to the pipeline 5 is one thousandth, and the smallest detectable value in the pipeline 5 The diameter of the particles is 0.1 mm, the scanning range of the high-power laser generator 1 is set to an angle α equal to 60 °, and the scanning frequency of the high-power laser generator 1 is set to:

10m ³ /h÷(π×0.025×0.025)÷0.0001÷3600=14154Hz, the power of the high-power laser generator 1 can be set at about 30W-60W, so that the maximum volume flow rate in the pipeline 5 is 10m ³ / h The evenly distributed bubbles and particles with a diameter of not less than 0.1mm in the liquid flowing through can be detected and can be based on

The size of is roughly to determine the range of the volume flow rate X of impurities.

Example 3

The diameter of the pipeline 5 is set to D = 300mm, the correction factor K = 1, the volume flow rate of the pipeline 5 is 2000m3 / h, the accuracy of the measurement system connected to the pipeline 5 is one thousandth, and the smallest detectable particles in the pipeline 5 The diameter is 1mm, the scanning range of the high-power laser generator 1 is set to an angle α equal to 90 °, and the scanning frequency of the high-power laser generator 1 is set to:

2000m ³ /h÷(π×0.15×0.15)÷0.001÷3600=7863Hz, the power of the high-power laser generator 1 can be set at about 500W-1000W, so that the maximum volume flow in the pipeline 5 can be 600m ³ / h Evenly distributed bubbles and particles with a diameter of not less than 1mm in the liquid flowing through can be detected and can be based on

The size of is roughly to determine the range of the volume flow rate X of impurities.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not deviate from the essence of the corresponding technical solutions of the technical solutions of the embodiments of the present invention. range.

Claims (8)

1. The high-frequency wide-range laser scanning intelligent detection device is characterized by comprising a high-power laser generator, which is installed on one side end of a pipeline carrying the liquid to be detected, and is used to emit a longitudinal section that can be placed on the pipeline A single laser beam repeatedly scanned within an angle α, a photoelectric sensor is provided on the inner wall of the other end of the pipe, and the photoelectric sensor is used to receive the single laser beam emitted by the high-power laser generator and convert the light The change in intensity is converted into an electrical signal. A modem and a transmitter are installed on the outer wall of the pipeline on the same side as the photoelectric sensor. The modem and the transmitter are used to determine that a single laser passes through the liquid in the pipeline and hits the place. The current caused by the light intensity sensed by the photoelectric sensor and the current caused by the light intensity sensed by the photoelectric sensor when impurities are mixed in the liquid in the pipeline, and the current signal is derived.
2. The high-frequency wide-range laser scanning intelligent detection device according to claim 1, wherein the range of α is 0-90 °.
3. The intelligent detection device for high-frequency wide-width laser scanning according to claim 2, wherein the range of α is 45-90 °.
4. The intelligent detection device for high-frequency wide-width laser scanning according to claim 3, characterized in that the photoelectric sensor, the modem and the transmitter are all fixed to the pipeline by a riveted screw.
5. The high-frequency wide-width laser scanning intelligent detection method using the high-frequency wide-width laser scanning intelligent detection device according to any one of claims 1-4, wherein the specific steps are:

   (1) A single laser beam emitted by the high-power laser generator is repeatedly scanned within a range of angle α on the longitudinal section of the pipeline;

   (2) Set the frequency of repeated scanning of a single laser to F, the volumetric flow rate of the liquid in the pipe is V, the cross-sectional area of the pipe is S and the smallest detectable diameter of impurities in the liquid flowing in the pipe For D, match according to the following formula: F = (KV) / (SD), where K is the correction factor, and fine-tune according to the frequency attenuation or gain;

   (3) When the modem and the transmitter measure the current I1 caused by the single beam of laser light passing through the liquid in the pipeline and the light intensity induced by the photoelectric sensor and the impurities mixed in the liquid in the pipeline The current I2 caused by the light intensity induced by the sensor, and the current signal is derived;

   (4) The transmission power of the high-power laser generator is set according to the current I1 and the current I2;

   (5) Set the volume flow rate of impurities mixed in the liquid in the pipeline to X, according to

   

   Determine the volume flow of impurities.
6. The intelligent detection method for high-frequency wide-width laser scanning according to claim 5, characterized in that: α in the step (1) is determined according to the scanning frequency of the high-power laser generator, and the The scanning frequency is adjusted according to the degree of uniform distribution of impurities contained in the liquid flowing in the pipe, and the scanning frequency decreases as the degree of uniform distribution increases, and the angle α increases as the scanning frequency increases.
7. The intelligent detection method for high-frequency wide-width laser scanning according to claim 5, wherein the value range of K in step (2) is 0.9-1.2.
8. The intelligent detection method for high-frequency wide-width laser scanning according to claim 5, wherein the impurities in the step (2) are solid particles or bubbles.

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