CN113155238B - Intelligent oil interface detection device - Google Patents

Abstract

The invention provides an intelligent oil interface detection device which comprises a probe, a connecting assembly and a control system, wherein a sleeve is arranged outside the probe, a lens is arranged in front of the sleeve, the lens is a hemispherical lens, and an optical fiber is welded with the hemispherical lens. The connection assembly includes an optical fiber and a splice disposed outside the ferrule. The control system comprises a digital display mechanism, a light source and a photoelectric conversion module, wherein the photoelectric conversion module consists of an adjustable constant current source circuit, a photocurrent signal isolation amplifying circuit, a signal conditioning circuit and an optical fiber receiving and transmitting interface element. The detection device has the advantages of current conversion precision of 24-bit resolution, control instrument system temperature control precision of +/-1 ℃, feedback precision of 0.1%, optical probe working temperature of-40 ℃ to +80 ℃, control system working temperature of +10 ℃ to +40 ℃ and control system working humidity of 80%, can accurately distinguish all oil interfaces conveyed on a finished oil conveying pipeline on line, and has the cost which is half of that of the existing interface detection sensor.

Description

An intelligent detection device for oil product interface

Technical Field

The invention belongs to the technical field of oil transportation equipment, and in particular relates to an oil transportation detection device.

Background technique

Pipeline transportation has become the preferred mode of transportation for oil and gas resources. Compared with other modes of transportation, pipeline transportation has many obvious advantages and has been widely accepted and applied by countries around the world. Pipeline transportation has a large volume, which can significantly reduce oil loss and reduce costs; it can save multiple operating links such as loading and unloading and transportation, and significantly reduce transportation costs. Pipeline transportation can improve the coordination of oil supply, optimize oil transportation operation conditions, facilitate centralized management, and has strong adaptability to complex terrain and harsh climatic conditions, no pollution to the environment, and safe and reliable transportation process; pipeline construction is fast, occupies less land, and requires less investment. The transportation of refined oil pipelines shows its superiority. Refined oil is a flammable, explosive, and volatile dangerous good, and the use of sealed pipelines for transportation is extremely safe. Moreover, refined oil is a liquid cargo with good fluidity, which is convenient for pipeline transportation. However, there are many types of refined oil, and the single transportation volume is relatively low compared to crude oil. If a separate pipeline is built for each type of oil, like the crude oil transportation pipeline, it is not economical. Therefore, currently all refined oil products in the world are transported in a sequential manner. The interface detector is a device currently used for interface tracking in refined oil transportation. It has the advantages of stable operation, high recognition rate, high reliability and easy maintenance.

In order to timely and accurately grasp the location of the oil mixing section, reduce the oil mixing loss and the energy loss of the subsequent oil mixing treatment, and ensure the safe and economical operation of the pipeline, people began to develop optical interface detectors with higher accuracy and relatively good reliability.

For example, Jinan University proposed CN200910193923.2, a method for detecting the oil interface in an oil pipeline based on transmission spectroscopy. The detection method utilizes a light source module to emit light of different wavelengths to illuminate the flowing oil through an incident optical fiber and a collimated light component. The transmitted light then passes through a focusing component and an output optical fiber into a spectrometer module. The problem of distinguishing the oil interface is solved by calculating and analyzing data such as spectral intensity and based on the relationship between spectrum and intensity and the oil. Tianjin University also proposed a study on a pipeline interface detector based on energy flow ratio. This detection method can reduce interface positioning errors, improve measurement accuracy, and achieve real-time rapid detection. Patents CN201220501542.3 Fiber optic probe and liquid interface detection device and CN 201811024344.0 A sequential oil mixing control tracking method and system proposed by Sinopec also disclose a probe structure and a detection method. This probe changes the optical prism structure of the probe. Compared with the 90° prism used in a two-phase liquid interface fiber optic tester disclosed in CN2225022Y and the conical attenuated total reflection (ATR) element used in an infrared detector disclosed in CN1372635A, the accuracy is improved. However, this test structure relying on total reflection has poor probe stability.

In general, the above-mentioned probe structures will still have a certain amount of pure oil discharged as mixed oil, and the discrimination accuracy needs to be further improved. In addition, the probe is prone to detection signal deviation in the oil transportation environment with high pressure, high flow rate, large temperature difference and light changes in the surrounding environment, and the probe may even be damaged, resulting in inaccurate testing.

Summary of the invention

Aiming at the technical problems in the prior art that the interface detection device has low precision, the probe is prone to detection signal deviation in the oil transportation environment with high pressure, high flow rate, large temperature difference and light change in the surrounding environment, and even the probe may be damaged, resulting in inaccurate interface detection. The present invention provides an intelligent oil interface detection device, which improves the stability of the detection device by fixing the detection device on the oil pipeline and the fixing structure of the internal components of the probe, improves the detection accuracy of the probe by adding temperature control and light control structures and circuits, improves the sensitivity of the oil interface detection device, and facilitates control, so that the oil detection device can be accurately controlled, and has wide applicability in the field of oil interface detection.

The invention provides an intelligent oil product interface detection device, comprising a probe, a connection component and a control system. A sleeve is provided outside the probe, a lens is provided in front of the sleeve, the lens is a hemispherical lens, and the optical fiber is fused with the hemispherical lens.

In the present invention, the connection assembly includes an optical fiber and a connector arranged outside the sleeve.

In the present invention, the control system includes a digital display mechanism, a light source and a photoelectric conversion module, and the photoelectric conversion module includes an adjustable constant current source circuit, a photocurrent signal isolation amplifier circuit, a signal conditioning circuit, and an optical fiber transceiver interface element.

In the present invention, the photoelectric conversion module further includes a temperature control module and a light and temperature control mechanism.

In the present invention, a core body is arranged inside the sleeve, and an O-ring is arranged between the sleeve and the core body.

As a preferred solution, there are two optical fibers, sealant is provided around the two optical fibers, and a thin optical core is provided between the optical fibers and the hemispherical lens.

As a preferred solution, an O-ring retaining ring is provided on one side of the O-ring.

As a preferred solution, the illumination and temperature control mechanism is a heat-insulating shading material and a heating mechanism, and the heating mechanism and other photoelectric conversion modules are wrapped in the heat-insulating shading material. The heating mechanism used is a semiconductor heater, and the heat-insulating shading material is black heat-insulating foam.

As a preferred solution, a snake tube is provided outside the optical fiber outside the probe, and an optical fiber fixed joint is provided outside the snake tube, and the optical fiber fixed joint is connected to the control system housing.

As a preferred solution, a fiber optic connector is provided at the end of the optical fiber, and a connector is provided in the control system, and the connector and the fiber optic connector are adaptively connected.

As a preferred solution, a protective head is provided in front of the probe, a side hole is provided on the protective head, and an annular baffle is provided outside the protective head.

As a preferred solution, three sections of light source holes are provided at one end of the connector, the apertures of the three sections of light source holes are progressive, fixing screws are provided on both sides of the light source holes, and a clamping column and a fixing thread are provided at the other end of the connector.

In the present invention, sealant is arranged around the two optical fibers, fixing glue is arranged around the hemispherical lens, and the fixing glue is wrapped outside the sealant.

As a preferred solution, a wedge-shaped groove is provided between the fixing glue and the sealing glue.

In the present invention, liquid paraffin in diesel and other impurities in oil products will form a "film" of a certain thickness on the probe surface, causing the light intensity reflectivity of the probe to decrease. In order to reduce the probability of "film" generation and slow down the speed of "film" formation, the hemispherical lens adopts a sapphire hemispherical lens, and the surface finish of the hemispherical lens is greater than 2.

Beneficial effects of the present invention:

The present invention provides an intelligent oil product interface detection device, the optical path design and result design will not be disturbed by external light signals and temperature, and will not cause significant signal attenuation. Both the inside of the probe and the joint with the oil pipeline adopt an anti-leakage design, with good sealing performance, which meets the pressure resistance requirements of refined oil transmission.

The intelligent oil product interface detection device provided by the present invention has the advantages of miniaturization, high reliability, high mechanical strength, small influence of pipeline flow resistance, small external space occupation, and easy installation through the protection head design. In the product structure design, it is necessary to fully implement the integrated and miniaturized design ideas, minimize the product volume, improve the reliability of optical signal conversion and transmission, and improve the comprehensive reliability index of the product. The entire design makes the sensor test performance power index ≯80W, the photocurrent conversion accuracy 24-bit resolution, the control instrument system temperature control accuracy ±1°C, the feedback signal analog quantity 4~20mA, 0~5V, 0~10V and field bus optional, the feedback accuracy 0.1%, the optical probe working temperature -40°C~+80°C, the optical probe working humidity 95%, the control system working temperature +10°C~+40°C, the control system working humidity 80%, and can accurately distinguish all oil product interfaces transported on the finished oil pipeline online, and the cost is only half of the existing interface detection sensor.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of the intelligent oil product interface detection device of the present invention.

FIG. 2 is a schematic diagram of the local structure of FIG. 1B of the present invention.

FIG. 3 is a circuit schematic diagram of an adjustable constant current source circuit and a photoelectric signal isolation amplifier circuit according to the present invention.

FIG4 is a circuit diagram of the switching voltage stabilizing circuit of the present invention;

FIG. 5 is a circuit diagram of the temperature control circuit of the present invention.

FIG. 6 shows a connector and an optical fiber connector of the present invention.

In Figure 1-6: 1-control system, 2-casing, 3-connector, 4-optical fiber connector, 5-core, 6-optical fiber fixed connector, 7-O-ring retaining ring, 8-optical fiber, 9-O-ring, 10-skin tube, 11-heating mechanism, 12-baffle, 13-protective head, 14-hemispherical lens, 15-sealant, 16-connector, 17-thermal insulation and shading material, 18-photoelectric conversion module, 19-digital display mechanism.

Detailed ways

The specific implementation modes of the present invention are further described in detail below in conjunction with Figures 1-6 and examples, but the method of the present invention is not limited to the following examples.

In the present invention, for the convenience of description, the description of the relative position relationship of each component in the present invention is described according to the layout of Figure 1, such as: the position relationship of up, down, left, right, etc. is determined according to the layout direction of Figure 1.

The optical fiber connector 4, core 5, optical fiber fixed connector 6, O-ring retaining ring 7, optical fiber 8, O-ring 9, snake tube 10, and hemispherical lens 14 used in the present invention can be purchased or customized through market channels. The optical fiber 8 adopts a single-core multi-mode HPC optical fiber.

Embodiment 1: Intelligent oil interface detection device

The present invention provides an intelligent oil product interface detection device, comprising a probe, a connecting component and a control system 1. A sleeve 2 is provided on the outside of the probe, a lens is provided in front of the sleeve 2, a core 5 is provided in the sleeve 2, an O-ring 9 is provided between the sleeve 2 and the core 5, an O-ring retaining ring 7 is provided on one side of the O-ring 9, and the lens is a hemispherical lens 14.

In the present invention, the connection assembly includes an optical fiber 8 and a connector 3 sleeved on the outside of a sleeve 2 , and the optical fiber 8 passes through the sleeve 2 and is fused with the hemispherical lens 14 .

In the present invention, the control system 1 includes a digital display mechanism 19, a light source and a photoelectric conversion module 18. The photoelectric conversion module 18 is composed of an adjustable constant current source circuit, a photocurrent signal isolation amplifier circuit, a signal conditioning circuit, a temperature control module, a light and temperature control mechanism, and an optical fiber transceiver interface element. The signal conditioning circuit includes a switching voltage regulator circuit and a temperature control circuit.

In the present invention, there are two optical fibers 8 , sealant 15 is provided around the two optical fibers 8 , and a thin optical core is provided between the optical fibers 8 and the hemispherical lens 14 .

In the present invention, the illumination and temperature control mechanism is a heat preservation and light-shielding material 17 and a heating mechanism 11, and the heating mechanism 11 and other photoelectric conversion modules are wrapped in the heat preservation and light-shielding material 17. The heating mechanism 11 used is a semiconductor heater, and the heat preservation and light-shielding material 17 uses black heat preservation foam.

In the present invention, a flexible tube 10 is provided outside the optical fiber outside the probe, and a fiber fixing joint 6 is provided outside the flexible tube 10 . The fiber fixing joint 6 is connected to the housing of the control system 1 .

In the present invention, an optical fiber connector 4 is provided at the end of the optical fiber 8, and a connector 16 is provided in the control system 1, and the connector 16 and the optical fiber connector 4 are adaptively connected.

In the present invention, a protective head 13 is provided in front of the probe, a side hole is provided on the protective head 13 , and an annular baffle 12 is provided outside the protective head 13 .

In the present invention, three sections of light source holes are provided at one end of the connector 16, and the apertures of the three sections of light source holes are progressive in sequence. Fixing screws are provided on both sides of the light source holes to fix the connector 16 on the circuit board and connect it to the photoelectric conversion module 18. A clamping column and a fixing thread are provided at the other end of the connector 16. When the optical fiber connector 4 is inserted into the connector 16, one end is fixed by screws and screwed into the fixing thread, and the other end is clamped on the clamping column.

In the present invention, a sealant 15 is provided around the two optical fibers 8 , and a fixing glue is provided around the hemispherical lens 14 , and the fixing glue is wrapped around the outside of the sealant 15 .

In the present invention, a wedge-shaped groove is provided between the fixing glue and the sealing glue 15 .

In the present invention, liquid paraffin in diesel and other impurities in oil products will form a "film" of a certain thickness on the probe surface, causing the light intensity reflectivity of the probe to decrease. In order to reduce the probability of "film" generation and slow down the speed of "film" formation, the hemispherical lens adopts a sapphire hemispherical lens 14, and the surface finish of the hemispherical lens is greater than 2.

Example 2: Application of intelligent oil interface detection device

When the intelligent oil interface detection device of the present invention is used, the two single-core multi-mode HPC optical fibers 8 of the probe are welded to the sapphire hemispherical lens 14, the two single-core multi-mode HPC optical fibers 8 are fixed with sealant 15, a wedge-shaped groove is engraved around the sealant 15, and fixing glue is poured around the hemispherical lens 14 and the sealant 15. The fixing glue penetrates into the wedge-shaped groove to fix the sealant 15 to the core 5.

A groove is provided around the core body 5, and a sleeve 2 is sleeved outside the core body 5. The sleeve 2 and the groove are fixed with an O-ring 9 and an O-ring retaining ring 7. One end of the single-core multi-mode HPC optical fiber 8 is sleeved with a snake skin tube 10, and one end of the snake skin tube 10 is pressed into the sleeve 2. An optical fiber fixed joint 6 is sleeved outside the snake skin tube 10. The optical fiber fixed joint 6 is fixed to the housing of the control system 1 during installation. An optical fiber connector 4 is welded to the end of the single-core multi-mode HPC optical fiber 8, and the optical fiber connector 4 is snapped onto the connector 16 of the control system 1, and fixed screws are installed and snapped. A heat-insulating and light-shielding material 17 is sealed around the photoelectric conversion module 18 of the control system 1. On the one hand, the internal temperature of the position is constant, and on the other hand, the internal brightness of the position is constant, so as to ensure that the photoelectric signal conversion process is not affected by temperature and light. The connector 3 sleeved outside the sleeve 2 is connected to the oil pipe during installation.

This assembly method ensures the stability of the optical fiber, and the sapphire hemispherical lens is firmly fixed by fixing glue, so that the hemispherical lens can be reliably fixed.

After assembly, the sensor is tested and the performance indicators are: power index ≯80W, photocurrent conversion accuracy 24-bit resolution, control instrument system temperature control accuracy ±1°C, feedback signal analog 4~20mA, 0~5V, 0~10V and field bus optional, feedback accuracy 0.1%, optical probe working temperature -40℃～+80℃, optical probe working humidity 95%, control system working temperature +10℃～+40℃, control system working humidity 80%. It can accurately distinguish all oil interfaces transported on the refined oil pipeline online, and the cost is only half of the existing interface detection sensors.

As described above, the present invention can be well implemented. The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the present invention.

Claims (3)

1. The intelligent oil interface detection device comprises a probe, a connecting assembly and a control system, and is characterized in that a sleeve is arranged outside the probe, a lens is arranged in front of the sleeve, and the lens is a hemispherical lens;

the connecting component comprises an optical fiber and a connector sleeved outside the sleeve, and the optical fiber passes through the sleeve and is welded with the hemispherical lens;

a core body is arranged in the sleeve, and an O-shaped ring is arranged between the sleeve and the core body;

the optical fibers are two, sealant is arranged around the two optical fibers, fixing glue is arranged around the hemispherical lens, and the fixing glue is wrapped outside the sealant;

a wedge-shaped groove is arranged between the fixing glue and the sealing glue;

The control system comprises a digital display mechanism, a light source and a photoelectric conversion module, wherein the photoelectric conversion module comprises an adjustable constant current source circuit, a photocurrent signal isolation amplifying circuit, a signal conditioning circuit and an optical fiber receiving and transmitting interface element;

The photoelectric conversion module further comprises a temperature control module and an illumination and temperature control mechanism;

the illumination and temperature control mechanism is a heat-insulating and shading material and a heating mechanism, and the heating mechanism and other photoelectric conversion modules are wrapped in the heat-insulating and shading material;

The optical fiber end is provided with an optical fiber connector, a connector is arranged in the control system, and the connector is connected with the optical fiber connector in a matching way;

Three sections of light source holes are formed in one end of the connector, the diameters of the three sections of light source holes are sequentially increased, fixing screws are arranged on two sides of the light source holes, and clamping columns and fixing threads are arranged at the other end of the connector;

The probe is provided with a protection head in front, a side hole is arranged on the protection head, and an annular baffle is arranged outside the protection head.

2. The intelligent oil interface detection device according to claim 1, wherein an O-ring retainer ring is arranged on one side of the O-ring.

3. The intelligent oil interface detection device according to claim 1, wherein an external optical fiber of the probe is provided with a flexible pipe, an external optical fiber fixing connector of the flexible pipe is connected with the control system shell.