Double-layer polyethylene pipeline based on optical fiber pressure monitoring

Abstract

The utility model provides a double-layer polyethylene pipeline based on optical fiber pressure monitoring, which comprises a polyethylene outer pipeline and a polyethylene inner pipeline, the polyethylene outer pipeline and the polyethylene inner pipeline are coaxially sleeved and installed, the polyethylene outer pipeline and the polyethylene inner pipeline are fixedly connected through a support frame, and a monitoring optical fiber is laid on the outer side surface of the polyethylene inner pipeline. A plurality of placement grooves are formed in the inner surface of the polyethylene outer pipeline, pressure sensors are installed in the placement grooves, the monitoring optical fibers are connected with the pressure sensors through connecting wires, and the pressure sensors are connected with an optical fiber strain demodulation instrument through connecting wires; and monitoring data is demodulated by the optical fiber strain demodulation instrument and then is sent to the signal processing system to realize real-time monitoring of the pipeline conveying pressure. The double-layer polyethylene pipeline based on optical fiber pressure monitoring solves the problems that corrosion resistance is poor, abrasion resistance is poor, adaptability to special underground environments is poor, pipeline conveying pressure monitoring efficiency is low, and errors are large.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline conveying devices, and particularly relates to a double-layer polyethylene pipeline based on optical fiber pressure monitoring. Background Art

[0002] Pipeline conveying technology has been widely used in the industrial field, especially in the coal field, such as traditional coal pipeline conveying, pulp pipeline conveying, etc. In addition, there is also the emerging supercritical CO2 pipeline conveying for "carbon capture and carbon sequestration". The conventional conveying pipeline materials in the coal field are wear-resistant seamless steel pipes, carbon steel pipes, etc. Such conveying pipelines have obvious disadvantages in the application in the coal field, mainly manifested as follows:

[0003] First, the media components such as coal, pulp, and supercritical CO2 conveyed in the coal field are complex, with rough surfaces, strong corrosiveness and large friction under specific conditions, which easily cause metal deterioration and mechanical property damage of conventional material pipelines, resulting in pipe cracking and medium leakage, etc.

[0004] Second, the environment in coal mines is complex, and the conventional material pipelines have poor waterproof, anti-electric and flame-retardant properties, and cannot meet the safety requirements of the special environment in coal mines.

[0005] Third, most of the conventional conveying pipelines are single-layer. When the single-layer pipeline conveys polluting and dangerous media, once leakage occurs, it is easy to cause problems such as the shutdown of the conveying system and environmental and safety issues.

[0006] Fourth, the conventional pipeline conveying pressure monitoring and detection methods are complex and inefficient, and there are random errors caused by connections and wires.

[0007] Due to the above four reasons, the application of existing conventional conveying pipelines in the coal field has been restricted to a certain extent. Therefore, there is an urgent need for a pipeline with corrosion resistance, wear resistance, adaptability to the special environment in coal mines, and accurate and efficient pipeline pressure monitoring. Content of the Utility Model

[0008] The purpose of the utility model is to provide a double-layer polyethylene pipeline based on optical fiber pressure monitoring, which solves the problems of poor corrosion resistance, poor wear resistance, poor adaptability to the special underground environment, low efficiency and large error in pipeline conveying pressure monitoring.

[0009] The technical solution adopted by the present utility model is as follows: A double-layer polyethylene pipeline based on optical fiber pressure monitoring, including a polyethylene outer pipeline and a polyethylene inner pipeline. The polyethylene outer pipeline and the polyethylene inner pipeline are coaxially sleeved and installed. The polyethylene outer pipeline and the polyethylene inner pipeline are connected and fixed by a support frame. A monitoring optical fiber is laid on the outer surface of the polyethylene inner pipeline. A number of placement grooves are provided on the inner surface of the polyethylene outer pipeline, and pressure sensors are installed in the placement grooves. The monitoring optical fiber is connected to the pressure sensors through connecting wires. The pressure sensors are connected to an optical fiber strain demodulation instrument through connecting wires. The monitoring data is demodulated by the optical fiber strain demodulation instrument and then sent to a signal processing system to realize real-time monitoring of the pipeline conveying pressure.

[0010] The characteristics of the technical solution adopted by the present utility model are further as follows:

[0011] Further, both between the support frame and the polyethylene outer pipeline and between the support frame and the polyethylene inner pipeline are adhesively fixed.

[0012] Further, the polyethylene outer pipeline and the polyethylene inner pipeline are connected and fixed by a number of support frames, and the number of said support frames is arranged in an array.

[0013] Further, the shape of the support frame is arched, circular or square.

[0014] Further, the diameters of the polyethylene outer pipeline and the polyethylene inner pipeline are determined by the specific industrial working conditions of the application.

[0015] The beneficial effects of the present utility model are as follows:

[0016] (1) The double-layer polyethylene pipeline based on optical fiber pressure monitoring of the present utility model solves the problems of poor corrosion resistance, poor abrasion resistance, poor adaptability to special underground environments, low efficiency and large errors in pipeline conveying pressure monitoring existing in existing industrial conveying pipelines, especially conventional conveying pipelines in the coal field, and provides a pipeline with good corrosion and abrasion resistance, strong adaptability to special environments in coal mines, accurate and high-efficiency pipeline pressure monitoring.

[0017] (2) The double-layer polyethylene pipeline based on optical fiber pressure monitoring of the present utility model uses polyethylene material for the pipeline, improves the pipeline performance, and broadens the applicable range of the pipeline in special environments such as the coal field;

[0018] (3) The double-layer polyethylene pipeline based on optical fiber pressure monitoring of the present utility model adopts a double-layer pipeline, avoiding environmental and safety problems caused by leakage when transporting polluting and dangerous media.

[0019] (4) The double-layer polyethylene pipeline based on optical fiber pressure monitoring of the present utility model adopts optical fiber pipeline pressure monitoring, improving the efficiency and accuracy of pressure monitoring during pipeline transportation. Description of the Drawings

[0020] Figure 1 This is a schematic cross-sectional view of a double-layer polyethylene pipe based on optical fiber pressure monitoring of the present utility model;

[0021] Figure 2 This is a schematic structural view of a double-layer polyethylene pipe based on optical fiber pressure monitoring of the present utility model;

[0022] Figure 3 This is a schematic axial cross-sectional view of a double-layer polyethylene pipe based on optical fiber pressure monitoring of the present utility model;

[0023] Figure 4 This is a schematic structural view of the circular support frame in Embodiment 2 of the present utility model;

[0024] Figure 5 This is a schematic structural view of the arched support frame in Embodiment 3 of the present utility model.

[0025] In the figure: 1. Polyethylene outer pipe, 2. Polyethylene inner pipe, 3. Support frame, 4. Monitoring optical fiber, 5. Pressure sensor, 6. Connecting wire, 7. Optical fiber strain demodulation instrument, 8. Signal processing system, 9. Placement groove. Detailed implementation manners

[0026] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0027] The present utility model provides a double-layer polyethylene pipe based on optical fiber pressure monitoring, as Figure 1 and Figure 2 shown, which includes a polyethylene outer pipe 1, a polyethylene inner pipe 2, and a support frame 3. The polyethylene outer pipe 1 and the polyethylene inner pipe 2 are coaxially sleeved and installed. The polyethylene outer pipe 1 and the polyethylene inner pipe 2 are connected and fixed by the support frame 3. The support frame 3 is fixedly welded to the polyethylene outer pipe 1, and the support frame 3 is also fixedly welded to the polyethylene inner pipe 2;

[0028] A monitoring optical fiber 4 is laid on the outer surface of the polyethylene inner pipe 2. An installation groove 9 is installed on the inner surface of the polyethylene outer pipe 1. The pressure sensor 5 is installed in the installation groove 9. The monitoring optical fiber 4 is connected to the pressure sensor 5 through a connecting wire 6. As Figure 3 shown, during operation, the conveying medium flows in the inner pipe 2, and the pressure of the pipeline conveying is transmitted to the pressure sensor 5 through the monitoring optical fiber 4, and then transmitted to the optical fiber strain demodulation instrument 7 through the connecting wire 6. The monitoring data is demodulated and sent to the signal processing system 8 to realize real-time monitoring of the pipeline conveying pressure.

[0029] The conveying medium in the polyethylene inner pipe 2 can be a liquid, a gas, a solid-liquid two-phase flow, or a gas-liquid two-phase flow.

[0030] The pipe diameters of the polyethylene outer pipe 1 and the polyethylene inner pipe 2 are determined by specific industrial working conditions.

[0031] The polyethylene material of the double-layer pipe is a synthetic plastic, which has the characteristics of light weight, high strength, corrosion resistance, good waterproof, fireproof and anti-electricity performance, etc.

[0032] For convenient connection, the support frame 3 is also made of polyethylene, and its shape can be arched, circular or square.

[0033] The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0034] Embodiment 1

[0035] The double-layer polyethylene pipe based on optical fiber pressure monitoring, as Figure 1 and Figure 2 shown, includes a polyethylene outer pipe 1, a polyethylene inner pipe 2, and a support frame 3. The polyethylene outer pipe 1 and the polyethylene inner pipe 2 are coaxially sleeved and installed, and the polyethylene outer pipe 1 and the polyethylene inner pipe 2 are connected and fixed by the support frame 3;

[0036] A monitoring optical fiber 4 is laid on the outer surface of the polyethylene inner pipe 2, an installation groove 9 is installed on the inner surface of the outer pipe, a pressure sensor 5 is installed in the installation groove 9, and the monitoring optical fiber 4 and the pressure sensor 5 are connected by a connecting wire 6, as Figure 3 shown. During operation, the conveying medium flows in the polyethylene inner pipe 2, the pressure of the pipeline conveying is transmitted to the pressure sensor 5 through the monitoring optical fiber 4, and then transmitted to the optical fiber strain demodulation instrument 7 through the connecting wire 6. The monitoring data is demodulated and sent to the signal processing system 8 to realize the real-time monitoring of the pipeline conveying pressure.

[0037] The polyethylene material of the double-layer pipe is a synthetic plastic, which has the characteristics of light weight, high strength, corrosion resistance, good waterproof, fireproof and anti-electricity performance, etc.

[0038] For convenient connection, the support frame 3 is also made of polyethylene, and its shape is square.

[0039] Embodiment 2

[0040] The double-layer polyethylene pipe based on optical fiber pressure monitoring, as Figure 1 and Figure 2 shown, includes a polyethylene outer pipe 1, a polyethylene inner pipe 2, and a support frame 3. The polyethylene outer pipe 1 and the polyethylene inner pipe 2 are coaxially sleeved and installed, and the polyethylene outer pipe 1 and the polyethylene inner pipe 2 are connected and fixed by the support frame 3. The support frame 3 is fixedly welded to the polyethylene outer pipe 1, and the support frame 3 is also fixedly welded to the polyethylene inner pipe 2;

[0041] A monitoring optical fiber 4 is laid on the outer surface of the polyethylene inner pipe 2, an installation groove 9 is installed on the inner surface of the outer pipe, a pressure sensor 5 is installed in the installation groove 9, and the monitoring optical fiber 4 is connected to the pressure sensor 5 through a connecting wire 6, as Figure 3 shown. During operation, the conveying medium flows in the polyethylene inner pipe 2, the pressure of the pipeline conveying is transmitted to the pressure sensor 5 through the monitoring optical fiber 4, and then transmitted to the optical fiber strain demodulation instrument 7 through the connecting wire 6, and the monitoring data is sent to the signal processing system 8 after demodulation to realize the real-time monitoring of the pipeline conveying pressure.

[0042] The polyethylene material of the double-layer pipe is a synthetic plastic, which has the characteristics of light weight, high strength, corrosion resistance, good waterproof, fireproof and anti-electricity performance.

[0043] For the convenience of connection, the support frame 3 is also made of polyethylene and is circular in shape, as Figure 4 shown.

[0044] Embodiment 3

[0045] The double-layer polyethylene pipe based on optical fiber pressure monitoring, as Figure 1 and Figure 2 shown, includes a polyethylene outer pipe 1, a polyethylene inner pipe 2, and a support frame 3. The polyethylene outer pipe 1 and the polyethylene inner pipe 2 are coaxially sleeved and installed, and the polyethylene outer pipe 1 and the polyethylene inner pipe 2 are connected and fixed by the support frame 3. The support frame 3 is fixedly welded to the polyethylene outer pipe 1, and the support frame 3 is also fixedly welded to the polyethylene inner pipe 2;

[0046] A monitoring optical fiber 4 is laid on the outer surface of the polyethylene inner pipe 2, an installation groove 9 is installed on the inner surface of the outer pipe, a pressure sensor 5 is installed in the installation groove 9, and the monitoring optical fiber 4 is connected to the pressure sensor 5 through a connecting wire 6, as Figure 3 shown. During operation, the conveying medium flows in the polyethylene inner pipe 2, the pressure of the pipeline conveying is transmitted to the pressure sensor 5 through the monitoring optical fiber 4, and then transmitted to the optical fiber strain demodulation instrument 7 through the connecting wire 6, and the monitoring data is sent to the signal processing system 8 after demodulation to realize the real-time monitoring of the pipeline conveying pressure.

[0047] The polyethylene material of the double-layer pipe is a synthetic plastic, which has the characteristics of light weight, high strength, corrosion resistance, good waterproof, fireproof and anti-electricity performance.

[0048] For the convenience of connection, the support frame 3 is also made of polyethylene and is arched in shape, as Figure 5 shown.

[0049] The polyethylene outer pipe 1 and the polyethylene inner pipe 2 are connected and fixed by a plurality of support frames 3, and the plurality of support frames 3 are arranged in an array to enhance the fixing effect.

[0050] The working process of the double-layer polyethylene pipeline based on optical fiber pressure monitoring of the utility model is as follows: The conveying medium is conveyed in the inner pipeline 2. During normal operation, the medium passes through the inner pipeline 2, and the monitoring optical fiber 4 transmits data to the pressure sensor 5. The data of the pressure sensor 5 is processed by the optical fiber strain demodulation instrument 7, and finally the pipeline conveying pressure parameters are obtained through the signal processing system 8. When the inner pipeline 2 ruptures during the conveying process, resulting in the leakage of the conveying medium, the leakage will cause changes in the intensity and frequency of the optical signal in the monitoring optical fiber 4. By monitoring these changes, the leakage point can be detected and located in a timely manner, realizing the monitoring of the rupture and leakage of the inner pipeline 2 for conveying. At the same time, the outer pipeline 1 cooperates with the inner pipeline 2 to enhance the overall strength of the pipeline. After the inner pipeline 2 ruptures and leaks, the outer pipeline 1 prevents environmental and safety problems caused by the leakage of the medium.

Claims

1. A double-layer polyethylene pipe based on optical fiber pressure monitoring, characterized in that, It includes a polyethylene outer pipe (1) and a polyethylene inner pipe (2). The polyethylene outer pipe (1) and the polyethylene inner pipe (2) are coaxially sleeved and installed. The polyethylene outer pipe (1) and the polyethylene inner pipe (2) are connected and fixed by a support frame (3). A monitoring optical fiber (4) is laid on the outer surface of the polyethylene inner pipe (2). A number of placement grooves (9) are provided on the inner surface of the polyethylene outer pipe (1). Pressure sensors (5) are installed in the placement grooves (9). The monitoring optical fiber (4) is connected to the pressure sensors (5) through a connecting wire (6). The pressure sensors (5) are connected to an optical fiber strain demodulation instrument (7) through the connecting wire (6). After the monitoring data is demodulated by the optical fiber strain demodulation instrument (7), it is sent to a signal processing system (8) to realize real-time monitoring of the pipeline conveying pressure.

2. The double-layer polyethylene pipe based on optical fiber pressure monitoring according to claim 1, characterized in that, The support frame (3) is fixedly welded to the polyethylene outer pipe (1) and the support frame (3) is fixedly welded to the polyethylene inner pipe (2).

3. The double-layer polyethylene pipe based on optical fiber pressure monitoring according to claim 2, characterized in that The polyethylene outer pipe (1) and the polyethylene inner pipe (2) are connected and fixed by a number of support frames (3). The number of support frames (3) is arranged in an array.

4. The double-layer polyethylene pipe based on optical fiber pressure monitoring according to claim 3, characterized in that, The shape of the support frame (3) is arched, circular or square.

5. The double-layer polyethylene pipeline based on optical fiber pressure monitoring according to any one of claims 1-4, characterized in that The diameters of the polyethylene outer pipe (1) and the polyethylene inner pipe (2) are determined by the specific industrial working conditions of the application.

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