Device and method for automatically detecting concentration of gas in pipeline

Abstract

The invention discloses an automatic detection device and method for gas concentration in a pipeline, and relates to the technical field of natural gas metering, the device comprises a control system, a pressure sensor, a current conversion module and a methane detector; the methane detector is used for collecting a methane concentration signal in natural gas in a pipeline in real time, obtaining a methane concentration current signal corresponding to the methane concentration signal after the methane concentration signal passes through the current conversion module, and sending the methane concentration current signal to the control system; and the control system is used for analyzing the received methane concentration current signal and determining the methane concentration in the natural gas in the pipeline in real time. The methane concentration in the pipeline is obtained in real time, so that a scientific basis is provided for safely opening the pipeline, and an effective guarantee is provided for safe production.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas metering, and in particular to an automatic detection device and method for gas concentration in a pipeline. Background Art

[0002] In the natural gas metering and verification station / natural gas metering and verification point, there are existing devices of the metering and verification station of the primary system. In the primary device using the time-quality method (mt), after each inflation, a weighing operation needs to be performed, and at this time, the pipeline needs to be opened. In the current conventional practice, after nitrogen replacement, the pipeline is directly opened by workers. In the process of realizing the present invention, the inventors also found that the prior art has the following problems:

[0003] Since the primary laboratory requires higher environmental conditions and the natural gas concentration in the pipeline is not measured before opening, there may be residual natural gas remaining in the pipeline. As the pipeline is opened, this part of the natural gas may be released into the laboratory, posing a safety hazard. Summary of the invention

[0004] The technical problem to be solved by the present invention is to address the deficiencies of the prior art and specifically provide an automatic detection device and method for gas concentration in a pipeline, as follows:

[0005] 1) In the first aspect, the present invention provides an automatic detection device for gas concentration in a pipeline, and the specific technical scheme is as follows:

[0006] It includes a control system, a pressure sensor, a current conversion module and a methane detector;

[0007] The methane detector is used to: collect the methane concentration signal in the natural gas in the pipeline in real time, and obtain the methane concentration current signal corresponding to the methane concentration signal after passing through the current conversion module, and send it to the control system;

[0008] The control system is used to analyze the received methane concentration current signal and determine the methane concentration in the natural gas in the pipeline in real time.

[0009] The beneficial effects of the automatic detection device for gas concentration in a pipeline provided by the present invention are as follows:

[0010] It can obtain the methane concentration in the pipeline in real time, thus providing a scientific basis for the safe opening of the pipeline and providing effective protection for safe production.

[0011] On the basis of the above scheme, the automatic detection device for gas concentration in a pipeline of the present invention can also be improved as follows.

[0012] Furthermore, the control system is also used to: when the detected methane concentration is lower than a preset methane concentration threshold, issue an indication for prompting permission to perform the pipeline opening operation.

[0013] Further, it also includes a pressure transmitter;

[0014] The pressure transmitter is used to collect the pressure signal of natural gas in the pipeline in real time, and obtain the pressure current signal corresponding to the pressure signal after passing through the current conversion module, and send it to the control system;

[0015] The control system is used to analyze the received pressure current signal and determine the pressure of the natural gas in the pipeline in real time.

[0016] The beneficial effect of adopting the above further solution is that it can also monitor the pressure of the natural gas in the pipeline in real time, providing further guarantee for safe production.

[0017] Furthermore, the control system is also used to: when the pressure of the natural gas in the pipeline is lower than a preset pressure threshold, control the valve of the methane detector to open so that the methane detector can detect the methane concentration.

[0018] The beneficial effect of adopting the above further solution is that it can effectively prevent the methane detector from being damaged by high pressure.

[0019] Further, it also includes a temperature transmitter;

[0020] The temperature transmitter is used to collect the temperature signal of natural gas in the pipeline in real time, and obtain the temperature current signal corresponding to the temperature signal after passing through the current conversion module, and send it to the control system;

[0021] The control system is used to analyze the received temperature and current signals and determine the temperature of the natural gas in the pipeline in real time.

[0022] The beneficial effect of adopting the above further solution is that the temperature of the natural gas in the pipeline can be monitored in real time, providing further guarantee for safe production.

[0023] 2) In the second aspect, the present invention also provides a method for automatically detecting gas concentration in a pipeline, and the specific technical solution is as follows:

[0024] The methane detector collects the methane concentration signal in the natural gas in the pipeline in real time, and obtains the methane concentration current signal corresponding to the methane concentration signal after passing through the current conversion module, and sends it to the control system;

[0025] The control system analyzes the received methane concentration current signal and determines the methane concentration in the natural gas in the pipeline in real time.

[0026] On the basis of the above scheme, the automatic detection method of gas concentration in a pipeline of the present invention can also be improved as follows.

[0027] Furthermore, it also includes:

[0028] When the methane concentration detected by the control system is lower than a preset methane concentration threshold, the control system issues an indication for prompting permission to perform a pipeline opening operation.

[0029] Furthermore, it also includes:

[0030] The pressure transmitter collects the pressure signal of natural gas in the pipeline in real time, and obtains the pressure current signal corresponding to the pressure signal after passing through the current conversion module, and sends it to the control system;

[0031] The control system analyzes the received pressure current signal and determines the pressure of the natural gas in the pipeline in real time.

[0032] Furthermore, it also includes:

[0033] When the pressure of the natural gas in the pipeline detected by the control system is lower than a preset pressure threshold, the control system controls the valve of the methane detector to open so that the methane detector can detect the methane concentration.

[0034] Furthermore, it also includes:

[0035] The temperature transmitter collects the temperature signal of the natural gas in the pipeline in real time, and obtains the temperature current signal corresponding to the temperature signal after passing through the current conversion module, and sends it to the control system;

[0036] The control system analyzes the received temperature and current signals and determines the temperature of the natural gas in the pipeline in real time.

[0037] It should be noted that the beneficial effects achieved by the technical solution of the second aspect of the present invention and the corresponding possible implementation methods can be found in the above-mentioned technical effects of the first aspect and its corresponding possible implementation methods, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0039] Figure 1 This is one of the structural schematic diagrams of an automatic detection device for gas concentration in a pipeline according to an embodiment of the present invention;

[0040] Figure 2 This is a second structural schematic diagram of an automatic detection device for gas concentration in a pipeline according to an embodiment of the present invention;

[0041] Figure 3This is a third structural schematic diagram of an automatic detection device for gas concentration in a pipeline according to an embodiment of the present invention;

[0042] Figure 4 This is one of the flow charts of a method for automatically detecting gas concentration in a pipeline according to an embodiment of the present invention;

[0043] Figure 5 This is a second flow chart of a method for automatically detecting gas concentration in a pipeline according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0045] like Figure 1 As shown, an automatic detection device for gas concentration in a pipeline according to an embodiment of the present invention includes a control system, a pressure sensor, a current conversion module and a methane detector;

[0046] The methane detector is used to: collect the methane concentration signal in the natural gas in the pipeline in real time, and obtain the methane concentration current signal corresponding to the methane concentration signal after passing through the current conversion module, and send it to the control system;

[0047] Among them, the methane detector can be installed on the pipeline to the weighing tank to detect whether the natural gas concentration in the pipeline meets the requirements of the emission laboratory.

[0048] Among them, the current conversion module is used to convert the current value into a digital quantity so that it can be displayed on the computer.

[0049] Among them, the working principle of the current conversion module usually involves signal acquisition, conversion and output. Specifically, the module first acquires the input current signal, and then converts the signal into the required output current signal through the internal conversion circuit (such as A / D converter or D / A converter). During the conversion process, the module will maintain the mutual isolation between the working power supply, input signal and output signal to ensure the stability and reliability of the signal.

[0050] The control system is used to analyze the received methane concentration current signal and determine the methane concentration in the natural gas in the pipeline in real time.

[0051] The analysis of the received methane concentration current signal usually involves multiple links such as signal conversion, processing and display, as follows:

[0052] 1. Signal conversion:

[0053] ①Analog signal amplification: Since the current signal output by the sensor may be relatively weak, an analog amplifier is needed to amplify it to an appropriate level.

[0054] ② Filtering: The amplified signal may contain some noise and interference, so a filter is needed to filter it out to improve the signal-to-noise ratio.

[0055] ③Analog-to-digital conversion: In some cases, in order to perform digital signal processing or remote transmission, it is necessary to convert analog signals into digital signals. This can be achieved through an analog-to-digital converter (A / D Converter).

[0056] 2. Signal processing:

[0057] ①Calibration: Since there may be errors in the sensor and conversion circuit, the signal needs to be calibrated to eliminate the impact of these errors on the measurement results.

[0058] ② Data smoothing: In order to reduce the volatility of measurement results and improve the stability of measurement, the data can be smoothed. This usually involves averaging or weighted averaging of multiple measurement results.

[0059] ③Concentration calculation: Based on the calibrated signal and the characteristic curve of the sensor, the actual concentration value of methane can be calculated.

[0060] Optionally, the processed methane concentration signal can be displayed on a display so that the user can understand the methane concentration in the environment in real time. At the same time, an alarm circuit can be set. When the methane concentration exceeds a preset threshold, the alarm device is triggered to emit an audible and visual signal to remind the user to pay attention and take corresponding measures.

[0061] Optionally, in the above technical solution, the control system is also used to: when the detected methane concentration is lower than a preset methane concentration threshold, issue an indication for reminding to allow the pipeline opening operation.

[0062] Optionally, in the above technical solution, if Figure 2 As shown, it also includes a pressure transmitter; the pressure transmitter is used to: collect the pressure signal of the natural gas in the pipeline in real time, and obtain the pressure current signal corresponding to the pressure signal after passing through the current conversion module, and send it to the control system;

[0063] Among them, the pressure transmitter can be installed on the pipeline near the weighing tank to detect whether the natural gas pressure in the pipeline is in a normal pressure state (close to atmospheric pressure).

[0064] The control system is used to analyze the received pressure current signal and determine the pressure of the natural gas in the pipeline in real time.

[0065] Optionally, in the above technical solution, if Figure 3As shown, the control system is also used to: when the pressure of the natural gas in the pipeline is lower than a preset pressure threshold, control the valve of the methane detector to open so that the methane detector can detect the methane concentration.

[0066] Optionally, in the above technical solution, if Figure 3 As shown, it also includes a temperature transmitter; the temperature transmitter is used to: collect the temperature signal of the natural gas in the pipeline in real time, and obtain the temperature current signal corresponding to the temperature signal after passing through the current conversion module, and send it to the control system;

[0067] The control system is used to analyze the received temperature and current signals and determine the temperature of the natural gas in the pipeline in real time.

[0068] The following embodiments illustrate an automatic detection device for gas concentration in a pipeline of the present invention, which specifically includes: a control system, a current conversion module, a control module, a detection instrument, and a safety control valve;

[0069] The control module may be a solenoid valve installed near the weighing tank, used to cut off the methane detector, the pressure transmitter, etc. The control module may also control the opening and closing of the valve.

[0070] Among them, the control system includes operator workstation, PLC system, serial port server and switch;

[0071] The PLC system uses a network to communicate with the control module, where the control module is a part of the PLC system.

[0072] Among them, the detection instruments include: methane detector, pressure transmitter and temperature transmitter;

[0073] Among them, the safety-controlled valves include: electric switching valves, safety pressure relief valves and throttle valves; the safety-controlled valves can be installed near the weighing tank to cut off the valves at the methane detector and the pressure transmitter, and the safety pressure relief valve is used to automatically release the pressure when the pressure exceeds the limit.

[0074] Among them, the pressure transmitter collects the pressure signal of natural gas in the pipeline in real time, and obtains the pressure current signal corresponding to the pressure signal after passing through the current conversion module, and sends it to the control system; the control system is used to: analyze the received pressure current signal and determine the pressure of natural gas in the pipeline in real time, then:

[0075] 1) When the pressure of the natural gas in the pipeline is lower than the preset pressure threshold, the control system specifically controls the valve of the methane detector to open through the control module, so that the methane detector can detect the methane concentration. Specifically, the methane detector collects the methane concentration signal in the natural gas in the pipeline in real time, and obtains the methane concentration current signal corresponding to the methane concentration signal after passing through the current conversion module, and sends it to the control system; the control system analyzes the received methane concentration current signal, determines the methane concentration in the natural gas in the pipeline in real time, and when the detected methane concentration is lower than the preset methane concentration threshold, issues an indication to remind the pipeline to open. The control module can control the electric switch valve to open the pipeline, and cooperate with the automatic quick-opening joint to complete the automatic disassembly of the pipeline, thereby ensuring the environmental safety of the space. When the detected methane concentration is not lower than the preset methane concentration threshold, an indication is issued to remind that the methane concentration in the pipeline is high. When the methane concentration cannot meet the emission requirements, the operator is prompted to continue the nitrogen replacement operation until the methane concentration is lower than the set threshold. The opening operation can be performed. The preset pressure threshold can be 200kPa, and can also be set according to actual conditions. The preset methane concentration threshold can be set according to actual conditions. Figure 5 The medium safety value is the preset methane concentration threshold.

[0076] 2) When the pressure of the natural gas in the pipeline is not lower than the preset pressure threshold, a reminder control module is issued to open the safety pressure relief valve to release the pressure until the pressure of the natural gas in the pipeline is lower than the preset pressure threshold, and then the methane concentration is detected.

[0077] As an indispensable component of the industrial system, the safety and reliability of pipelines are directly related to the stable operation of the entire system. However, due to the long-term exposure of pipelines to harsh environments, as well as the influence of factors such as medium corrosion and external force impact, various abnormalities or defects may appear on their surfaces, such as cracks, corrosion, deformation, pollution, etc. These abnormalities will not only reduce the strength and durability of the pipeline, but may also cause safety accidents such as leakage and explosion. Therefore, regular inspection of the pipeline surface to timely discover and repair potential abnormalities or defects is of great significance to ensure the safe operation of the industrial system.

[0078] Image recognition technologies for pipeline surface anomalies are mainly based on machine vision or image processing algorithms. These technologies collect images of the pipeline surface and then use specific algorithms to process and analyze the images to identify potential anomalies or defects. Specifically, they include:

[0079] 1) Image acquisition: Use a high-resolution camera or image sensor to capture the pipeline surface and obtain clear image data.

[0080] 2) Image preprocessing: Preprocess the collected images, including denoising, contrast enhancement, brightness adjustment, etc., to improve the image quality.

[0081] 3) Feature extraction: Use image processing algorithms to extract key features in the image, such as edges, textures, colors, etc. These features can reflect the morphology and structural information of the pipeline surface.

[0082] 4) Anomaly detection: Compare the extracted features with the preset abnormal feature library, or use machine learning algorithms to classify and identify the features to determine whether there are anomalies or defects on the pipeline surface.

[0083] 5) Result output: The test results are output in the form of images or reports for reference and decision-making by testers.

[0084] Optionally, loop structures in machine vision or image processing algorithms, such as for loops, while loops, and do-while loops, are determined, parts that can be calculated in parallel are extracted, and the calculations are performed simultaneously on different processing units, which can improve training efficiency.

[0085] like Figure 4 As shown, a method for automatically detecting gas concentration in a pipeline according to an embodiment of the present invention comprises the following steps:

[0086] S1. The methane detector collects the methane concentration signal in the natural gas in the pipeline in real time, and obtains the methane concentration current signal corresponding to the methane concentration signal after passing through the current conversion module, and sends it to the control system;

[0087] S2. The control system analyzes the received methane concentration current signal and determines the methane concentration in the natural gas in the pipeline in real time.

[0088] Optionally, in the above technical solution, it also includes:

[0089] S3. When the methane concentration detected by the control system is lower than a preset methane concentration threshold, the control system issues an indication for prompting permission to perform pipeline opening operations.

[0090] Optionally, in the above technical solution, it also includes:

[0091] S010, the pressure transmitter collects the pressure signal of the natural gas in the pipeline in real time, and obtains the pressure current signal corresponding to the pressure signal after passing through the current conversion module, and sends it to the control system;

[0092] S011. The control system analyzes the received pressure current signal and determines the pressure of the natural gas in the pipeline in real time.

[0093] Optionally, in the above technical solution, it also includes:

[0094] S012. When the pressure of the natural gas in the pipeline detected by the control system is lower than a preset pressure threshold, the control system controls the valve of the methane detector to open so that the methane detector can detect the methane concentration.

[0095] Optionally, in the above technical solution, it also includes:

[0096] The temperature transmitter collects the temperature signal of the natural gas in the pipeline in real time, and obtains the temperature current signal corresponding to the temperature signal after passing through the current conversion module, and sends it to the control system;

[0097] The control system analyzes the received temperature and current signals and determines the temperature of the natural gas in the pipeline in real time.

[0098] Through the following embodiments, an automatic detection method of gas concentration in a pipeline of the present invention is described as follows, specifically:

[0099] 1) When the pressure of the natural gas in the pipeline is lower than the preset pressure threshold, the control system specifically controls the valve of the methane detector to open through the control module, so that the methane detector can detect the methane concentration. Specifically, the methane detector collects the methane concentration signal in the natural gas in the pipeline in real time, and obtains the methane concentration current signal corresponding to the methane concentration signal after passing through the current conversion module, and sends it to the control system; the control system analyzes the received methane concentration current signal, determines the methane concentration in the natural gas in the pipeline in real time, and when the detected methane concentration is lower than the preset methane concentration threshold, issues an indication to remind the pipeline to open. The control module can control the electric switch valve to open the pipeline, and cooperate with the automatic quick-opening joint to complete the automatic disassembly of the pipeline, thereby ensuring the environmental safety of the space. When the detected methane concentration is not lower than the preset methane concentration threshold, an indication is issued to remind that the methane concentration in the pipeline is high. When the methane concentration cannot meet the emission requirements, the operator is prompted to continue the nitrogen replacement operation until the methane concentration is lower than the set threshold. The opening operation can be performed. The preset pressure threshold can be 200kPa, and can also be set according to actual conditions. The preset methane concentration threshold can be set according to actual conditions.

[0100] 2) When the pressure of the natural gas in the pipeline is not lower than the preset pressure threshold, a reminder control module is issued to open the safety pressure relief valve to release the pressure until the pressure of the natural gas in the pipeline is lower than the preset pressure threshold, and then the methane concentration is detected.

[0101] It should be noted that the beneficial effects of the automatic detection method of the gas concentration in the pipeline provided by the above embodiment are the same as the beneficial effects of the automatic detection device of the gas concentration in the pipeline provided by the above embodiment, which will not be repeated here. In addition, the method and device embodiments provided by the above embodiment belong to the same concept, and the specific implementation process is detailed in the device embodiment, which will not be repeated here.

[0102] In the above embodiments, although the steps are numbered S1, S2, etc., these are only specific embodiments given by the present invention. Those skilled in the art may adjust the execution order of S1, S2, etc. according to actual conditions, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0104] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An automatic detection device for gas concentration in a pipeline, characterized in that: It includes a control system, a pressure sensor, a current conversion module and a methane detector; The methane detector is used to: collect the methane concentration signal in the natural gas in the pipeline in real time, and obtain the methane concentration current signal corresponding to the methane concentration signal after passing through the current conversion module, and send it to the control system; The control system is used to analyze the received methane concentration current signal and determine the methane concentration in the natural gas in the pipeline in real time.

2. The automatic detection device for gas concentration in a pipeline according to claim 1 is characterized in that: The control system is also used for: when the detected methane concentration is lower than a preset methane concentration threshold, issuing an indication for prompting permission to perform a pipeline opening operation.

3. The automatic detection device for gas concentration in a pipeline according to claim 1 or 2, characterized in that: Also included is a pressure transmitter; The pressure transmitter is used to collect the pressure signal of the natural gas in the pipeline in real time, and obtain the pressure current signal corresponding to the pressure signal after passing through the current conversion module, and send it to the control system; The control system is used to analyze the received pressure current signal and determine the pressure of the natural gas in the pipeline in real time.

4. The automatic detection device for gas concentration in a pipeline according to claim 3 is characterized in that: The control system is also used to: when the pressure of the natural gas in the pipeline is lower than a preset pressure threshold, control the valve of the methane detector to open so that the methane detector can detect the methane concentration.

5. The automatic detection device for gas concentration in a pipeline according to claim 1 or 2, characterized in that: Also included is a temperature transmitter; The temperature transmitter is used to collect the temperature signal of the natural gas in the pipeline in real time, and obtain the temperature current signal corresponding to the temperature signal after passing through the current conversion module, and send it to the control system; The control system is used to analyze the received temperature and current signals and determine the temperature of the natural gas in the pipeline in real time.

6. A method for automatically detecting gas concentration in a pipeline, characterized in that: include: The methane detector collects the methane concentration signal in the natural gas in the pipeline in real time, and obtains the methane concentration current signal corresponding to the methane concentration signal after passing through the current conversion module, and sends it to the control system; The control system analyzes the received methane concentration current signal to determine the methane concentration in the natural gas in the pipeline in real time.

7. The method for automatically detecting gas concentration in a pipeline according to claim 6, characterized in that: Also includes: When the methane concentration detected by the control system is lower than a preset methane concentration threshold, the control system issues an instruction for prompting permission to perform a pipeline opening operation.

8. The method for automatically detecting gas concentration in a pipeline according to claim 6 or 7, characterized in that: Also includes: The pressure transmitter collects the pressure signal of the natural gas in the pipeline in real time, and obtains the pressure current signal corresponding to the pressure signal after passing through the current conversion module, and sends it to the control system; The control system analyzes the received pressure current signal and determines the pressure of the natural gas in the pipeline in real time.

9. The method for automatically detecting gas concentration in a pipeline according to claim 8, characterized in that: Also includes: When the pressure of the natural gas in the pipeline detected by the control system is lower than a preset pressure threshold, the control system controls the valve of the methane detector to open, so that the methane detector detects the methane concentration.

10. The method for automatically detecting gas concentration in a pipeline according to claim 6 or 7, characterized in that: Also includes: The temperature transmitter collects the temperature signal of the natural gas in the pipeline in real time, and obtains the temperature current signal corresponding to the temperature signal after passing through the current conversion module, and sends it to the control system; The control system analyzes the received temperature and current signals to determine the temperature of the natural gas in the pipeline in real time.

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