Device and method for monitoring diffusion of fuel gas in power channel based on gradient adjustment

Abstract

The invention discloses a device and a method for monitoring gas diffusion in an electric power channel based on gradient adjustment, belongs to the technical field of gas diffusion monitoring, and solves the problem of how to monitor a gas diffusion rule in the electric power channel under different gradient conditions. The electric power channel module is used for simulating an actual electric power channel structure, the fuel gas leakage module is used for simulating the situation that fuel gas diffuses into the electric power channel through leakage points, the gradient adjusting module is used for lifting the electric power channel module and adjusting the gradient of the electric power channel module, and the sensor module is used for capturing fuel gas under different gradient conditions. According to the method, the gas diffusion conditions under different gradients are analyzed in real time according to the downslope gas concentration and the downslope gas concentration on the two sides of a leakage point, the gas diffusion path and rule are analyzed through a data acquisition and analysis module, early warning is conducted on dangerous points of gas diffusion under different gradient conditions, theoretical support is provided for the optimal installation position of a sensor, and the gas diffusion risk is lowered. And the coverage range monitored by the sensor is optimized.

Description

Technical Field

[0001] The invention belongs to the technical field of gas diffusion monitoring, and relates to a device and method for monitoring gas diffusion in a power channel based on slope adjustment. Background Art

[0002] In modern urban underground pipe networks, gas pipelines and power pipelines are often laid in parallel or adjacent to each other due to space limitations. Although both pipeline systems follow strict safety regulations in design and construction, there is a potential coupling risk between gas pipeline leakage and the power pipeline system due to the flammable and explosive nature of gas and the high voltage risk in power pipelines. When gas leaks into the power pipeline, the gas may accumulate in the power channel. If the power equipment fails or arcs at this time, it is very easy to cause a gas explosion, which in turn causes a serious safety accident.

[0003] Existing technologies, such as the invention patent with application publication number CN113947325A, disclose a risk simulation test bench for coupling power cable channels with municipal gas pipeline networks. The test bench automatically samples the parameters of combustible gases leaking in the soil and channels through gas sensors and gas sampling sensors, and simulates the diffusion and accumulation process of gas in the power cable channel under different soil conditions, thereby providing technical support for the prevention and disposal of natural gas pipeline leakage accidents.

[0004] Existing gas leak monitoring systems often rely on sensors at fixed positions and do not consider the diffusion of gas in power channels. The layout of sensors cannot fully cope with the complex terrain changes in power channels, especially under conditions of different slopes or irregular terrain. The diffusion path of gas is difficult to predict, resulting in blind spots in some monitoring areas or the inability to capture gas leaks in real time. Due to the inability to fully predict the gas diffusion path, the layout of traditional monitoring equipment is often based on experience rather than scientific analysis, resulting in unreasonable sensor location settings and the inability to effectively cover all possible areas of gas leakage. This unreasonable equipment layout can easily lead to delayed or missed gas leak detection, increasing safety hazards.

[0005] At the same time, the diffusion of gas in the power channel is affected by many factors, such as the slope of the power channel, the structure of the power channel, the gas leakage pressure, etc. The gas diffusion pattern under the combined effect of these factors is difficult to predict. In practical applications, power channels and gas pipelines are often in complex underground environments, with uneven pipeline slopes. Traditional fixed-point monitoring systems are difficult to fully cover all potential leakage areas, especially after the gas enters the power pipeline. Existing gas monitoring devices are usually difficult to judge the diffusion speed and concentration changes of gas leaks in real time, resulting in low gas leak monitoring accuracy and great harm to the power system. Summary of the invention

[0006] The technical solution of the present invention is used to solve the problem of how to monitor the diffusion law of gas in a power channel under different slope conditions.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A gas diffusion monitoring device in an electric power channel based on slope adjustment, comprising an electric power channel module, a gas leakage module, a slope adjustment module, a sensor module and a data acquisition and analysis module;

[0009] The power channel module includes a cable trench, a power well, and a power pipeline; a plurality of the cable trenches are connected in sequence, the power pipeline is laid in the cable trench, and both ends of the power well are connected to the cable trench;

[0010] The gas leakage module comprises a high-pressure gas storage tank, a gas pipeline, a check valve, a flow regulating valve and a leakage point; the high-pressure gas storage tank, the check valve, the flow regulating valve and the leakage point are connected in sequence through the gas pipeline, and the leakage point is arranged at the bottom of the power channel module;

[0011] The slope adjustment module includes a support frame, a driving component, and an adjusting component; the top of the support frame is fixedly connected to the bottom of the power channel module, the adjusting component is movably connected to the bottom of the support frame, and the output end of the driving component is movably connected to the adjusting component to drive the adjusting component to lift the power channel module and adjust the slope of the power channel module;

[0012] The sensor module includes a sensor array disposed in the power channel module; a plurality of the sensor arrays are symmetrically arranged on both sides of the leakage point, and the sensor array includes gas sensors uniformly distributed along the height direction of the power channel;

[0013] The data acquisition and analysis module includes a data acquisition unit, an information synchronizer, a camera, a visual window and a laser light source; the input end of the data acquisition unit is respectively connected to the output ends of multiple sensors, the input end of the data acquisition unit is connected to the input end of the information synchronizer, the input end of the information synchronizer is connected to the common connection point of the flow regulating valve and the check valve, the output end of the information synchronizer is connected to the laser light source, tracer particles are arranged inside the power channel module, a visual window is arranged on the outside of the power channel module, and the camera records the movement trajectory of the tracer particles through the visual window.

[0014] Furthermore, the driving assembly includes a base, a hydraulic solenoid valve and a driving gear; the fixed end of the hydraulic solenoid valve is fixedly connected to the base, and the movable end of the hydraulic solenoid valve is rotationally connected to the driving gear.

[0015] Further, the adjustment assembly includes a movable rack, a bottom plate, a movable plate, an upper support plate, a first lifting arm, a second lifting arm, a third lifting arm and a fourth lifting arm; the first lifting arm and the second lifting arm are symmetrically arranged, and the third lifting arm and the fourth lifting arm are symmetrically arranged; the bottom plate is fixedly connected to the bottom of the support frame, a movable slot is arranged on one side of the bottom plate, the movable rack is slidably arranged in the movable slot, one end of the movable rack is meshed and connected with the driving gear, the other end of the movable rack is hinged to the bottom of the first lifting arm, and the bottom of the second lifting arm is hinged to the other side of the base; one side of the movable plate is hinged to the top of the first lifting arm, a slide groove is provided on the other side of the movable plate, the top of the second lifting arm is slidably arranged in the slide groove, and the bottom of the third lifting arm is hinged to the top of the second lifting arm; the bottom of the fourth lifting arm is hinged to the side of the movable plate away from the slide groove; one side of the upper support plate is hinged to the top of the third lifting arm, and a slide groove is provided on the other side of the upper support plate, and the top of the fourth lifting arm is slidably arranged in the slide groove.

[0016] Furthermore, it also includes a pipe fitting; the pipe fitting is used to connect multiple power channel modules, and the pipe fitting is an L-shaped pipe fitting or a T-shaped pipe fitting.

[0017] The present invention also provides a method for monitoring gas diffusion in a power channel based on slope adjustment, comprising the following steps:

[0018] S1. Using the sensor module to collect the real-time gas concentration on both sides of the leakage point, determine the gas diffusion direction on both sides of the leakage point; wherein, when the sensor array response speed on one side of the leakage point is higher than the sensor array response speed on the other side of the leakage point, it is determined that the gas diffusion direction on one side of the leakage point is downslope diffusion, and the gas diffusion direction on the other side of the leakage point is reverse slope diffusion;

[0019] S2, continuously collecting the real-time gas concentration of the sensor on the reverse slope side to determine the feasibility of continuous reverse diffusion of the gas; if the gas cannot continuously diffuse in the reverse direction, then recording the diffusion boundary and gas concentration on the reverse slope side; if the gas can continuously diffuse in the reverse direction, then executing step S3 to calculate the gas diffusion rate of reverse diffusion;

[0020] S3, respectively recording the response time of adjacent sensor arrays and the interval distance of adjacent sensor arrays, and respectively calculating the gas diffusion rate of down-slope diffusion and reverse-slope diffusion;

[0021] S4. Adjust the slope of the power channel through the slope adjustment module, adjust the gas leakage in the power channel through the gas leakage module, revise the adjusted gas diffusion coefficient, and update the gas diffusion rate of the slope diffusion and the reverse slope diffusion respectively;

[0022] S5. Establish a data set for revising the gas diffusion coefficient, fit the correlation between the gas diffusion direction, leakage amount and slope, and establish a gas diffusion prediction model.

[0023] Furthermore, the following formula is used in S3 to calculate the gas diffusion rate along the slope:

[0024]

[0025] Where V diff1 represents the gas diffusion rate along the slope, Δx represents the spacing between adjacent sensor arrays along the slope, and Δt1 represents the difference in response time between adjacent sensor arrays along the slope;

[0026] The gas diffusion rate of reverse slope diffusion is calculated using the following formula:

[0027]

[0028] Where V diff2 represents the gas diffusion rate of the reverse slope diffusion, Δy represents the spacing between adjacent sensor arrays on the reverse slope side, and Δt2 represents the difference in response time between adjacent sensor arrays on the reverse slope side.

[0029] Furthermore, the adjusted leakage diffusion coefficient is revised using the following formula in S4:

[0030] k(Q)=k0*(1+γθQ)

[0031] Wherein, k(Q) represents the leakage diffusion coefficient, k0 represents the reference leakage diffusion coefficient, γ represents the leakage adjustment parameter, and Q represents the gas leakage.

[0032] Furthermore, the adjusted downslope diffusion coefficient is revised using the following formula in S4:

[0033] A(θ)=A0*[1+αsin(θ)]

[0034] Where A(θ) represents the downslope diffusion coefficient, A0 represents the reference downslope diffusion coefficient, α represents the downslope diffusion adjustment parameter, and θ represents the slope of the power channel.

[0035] Furthermore, the adjusted reverse slope diffusion coefficient is revised using the following formula in S4:

[0036] B(θ)=B0*[1-βsin(θ)]

[0037] Where B(θ) represents the reverse slope diffusion coefficient, B0 represents the reference reverse slope diffusion coefficient, and β represents the reverse slope diffusion adjustment parameter.

[0038] Furthermore, the following formula is used in S4 to update the gas diffusion rate along the slope:

[0039] V′ diff1 =A(θ)*k(Q)*Q*cos(θ)*V diff1

[0040] Where V′ diff1 represents the gas diffusion rate along the slope after update;

[0041] The gas diffusion rate for reverse slope diffusion is updated using the following formula:

[0042] V′ diff2 =B(θ)*k(Q)*Q*cos(θ)*V′ diff2

[0043] Where V′ diff2 Represents the gas diffusion rate of the updated reverse slope diffusion.

[0044] The advantages of the present invention are:

[0045] (1) The present invention utilizes an electric power channel module to simulate the actual electric power channel structure, utilizes a gas leakage module to simulate the diffusion of gas into the electric power channel through a leakage point, utilizes a slope adjustment module to raise the electric power channel module, and adjusts the slope of the electric power channel module. The sensor module is used to capture the gas concentration along the slope and against the slope on both sides of the leakage point under different slope conditions, and the diffusion boundary and rate of the gas under different slopes are analyzed in real time. The data acquisition and analysis module is used to analyze the gas diffusion path and law, and to warn of dangerous points of gas diffusion under different slope conditions, thereby providing theoretical support for the optimal installation position of the sensor and optimizing the coverage of sensor monitoring to adapt to the gas diffusion simulation experiment scenarios in different electric power channels.

[0046] (2) The present invention controls the gas leakage rate and flow rate through the flow control valve to ensure the controllability of the leakage scenario in the experimental environment, and prevents gas backflow through the check valve to ensure the safety of the experiment.

[0047] (3) The present invention utilizes a driving component to control the lifting height of the adjusting component. The hydraulic solenoid valve drives the gear to mesh and rotate with the movable rack. The movable rack slides in the movable slot of the bottom plate, driving the first lifting arm to lift the movable plate. When the movable plate moves away from the bottom plate, the second lifting arm slides in the slide slot and plays a role of supporting the movable plate. The third lifting arm hinged to the second lifting arm is driven to lift the upper support plate. When the upper support plate moves away from the movable plate, the fourth lifting arm slides in the slide slot and plays a role of supporting the movable plate, thereby realizing the slope adjustment of the power channel to meet the testing requirements of different terrains. The slope of the power channel is adjusted by hydraulic pressure, which has the characteristics of high precision and smooth process, and ensures the controllability of the slope change during the simulation process. The device can adjust the slope continuously or in stages according to actual testing requirements, which is convenient for observing different trends of gas diffusion and has the advantage of repeatable operation.

[0048] (4) The present invention can connect multiple power channel modules by using pipes of different shapes, and realize the structural change of the entire power channel by splicing. It can splice a power channel that meets the experimental simulation according to working conditions and scene requirements, and has good practicality.

[0049] (5) The present invention takes into account the influence of the slope of the power channel in a complex environment, and uses the sensor module to collect the real-time gas concentration on both sides of the leakage point to determine the gas diffusion direction on both sides of the leakage point, and continuously collects the real-time gas concentration of the sensor on the reverse slope side to determine the feasibility of continuous reverse diffusion of the gas. If the reverse slope side cannot continuously reverse diffuse, the diffusion boundary and gas concentration on the reverse slope side are recorded, and the maximum value of the dangerous boundary and the maximum concentration that the gas reverse diffusion can reach under this slope condition are recorded, so as to provide a theoretical basis and technical support for the layout of the gas monitoring equipment installed in the power channel, and optimize the installation position of the sensor on the reverse slope side and the coverage of the sensor monitoring.

[0050] (6) The present invention studies the relationship between the response time of the sensor array on different sides of the leakage point in the power channel and the gas diffusion rate, uses the driving component to adjust the slope of the power channel, uses the flow control valve to adjust the gas leakage amount injected into the power channel, and adjusts it to a specified value according to the experimental working conditions to simulate the gas leakage in the power channel under different terrain conditions. In practical applications, the gas concentration data on both sides of the leakage point are collected by the sensor module, the adjustment parameters γ, α, β in the model are fitted, and the reference diffusion coefficients A0 and B0 are adjusted, so that the model can more accurately study the gas diffusion behavior in the power channel under different leakage amounts and slope conditions, and can be used to predict the gas diffusion rate in similar situations, which is conducive to in-depth analysis of the potential risk factors brought about by the diffusion of gas in the power channel and the complex interactions between the factors. It provides a scientific and reliable theoretical basis for the research on gas leakage monitoring in complex environments and has good guiding significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is an overall diagram of a gas diffusion monitoring device in a power channel based on slope adjustment according to the first embodiment of the present invention;

[0052] Figure 2 It is a structural diagram of a gas diffusion monitoring device in a power channel based on slope adjustment according to the first embodiment of the present invention;

[0053] FIG3( a ) is a front structural diagram of a slope adjustment module according to Embodiment 1 of the present invention;

[0054] FIG3( b ) is a back structural diagram of the slope adjustment module according to the first embodiment of the present invention;

[0055] Figure 4 is a schematic diagram of a sensor module according to a first embodiment of the present invention;

[0056] FIG5( a ) is a schematic diagram of a T-shaped pipe fitting according to Embodiment 1 of the present invention;

[0057] FIG5( b ) is a schematic diagram of an L-shaped pipe fitting according to Embodiment 1 of the present invention;

[0058] Figure 6 is a flow chart of a method for monitoring gas diffusion in a power channel based on slope adjustment according to a second embodiment of the present invention;

[0059] Reference numerals: 11, cable trench; 12, power well;

[0060] 21. High-pressure gas storage tank; 22. Gas pipeline; 23. Check valve; 24. Flow regulating valve; 25. Leakage point;

[0061] 31. Support frame; 321. Base; 322. Hydraulic solenoid valve; 323. Driving gear; 331. Movable rack; 332. Bottom plate; 333. Movable plate; 334. Upper support plate; 335. First lifting arm; 336. Second lifting arm; 337. Third lifting arm; 338. Fourth lifting arm;

[0062] 41. sensor array; 51. visual window; 52. camera; 53. information synchronizer; 54. data acquisition system; 55. laser sheet light source;

[0063] 61. Pipe fittings. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0066] Embodiment 1

[0067] like Figure 1-2 As shown, specifically, a gas diffusion monitoring device in an electric power channel based on slope adjustment is disclosed, including an electric power channel module, a gas leakage module, a slope adjustment module, a sensor module and a data acquisition and analysis module;

[0068] The power channel module includes a cable trench 11, a power well 12, and a power pipeline; a plurality of the cable trenches 11 are connected in sequence, the power pipeline is laid in the cable trench 11, and both ends of the power well 12 are connected to the cable trench 11;

[0069] Furthermore, the cable trenches 11 are sealed by rubber rings or welding; mesh covers are provided at both ends of the power well 12 to prevent interference from external airflow.

[0070] In this embodiment, the power channel module is used to simulate the actual power channel structure. The material of the power channel is selected from common materials used in the actual field, such as PVC material or metal material, to meet the performance requirements of high temperature resistance and corrosion resistance. The power channel module can be composed of multiple cable trenches 11 and power wells 12 according to the test requirements, and the geometric dimensions of the power channel can be adjusted according to the test requirements to adapt to the gas diffusion simulation experiment scenarios in different power channels.

[0071] like Figure 1-2 As shown, the gas leakage module includes a high-pressure gas storage tank 21, a gas pipeline 22, a check valve 23, a flow regulating valve 24 and a leakage point 25; the high-pressure gas storage tank 21, the check valve 23, the flow regulating valve 24 and the leakage point 25 are connected in sequence through the gas pipeline 22, and the leakage point 25 is set at the bottom of the power channel module;

[0072] Furthermore, after the multiple leakage points 25 are connected in series with the flow regulating valve 24, the non-series ends of the multiple flow regulating valves 24 are connected to one end of the check valve 23 through the gas pipeline 22, and the other end of the check valve 23 is connected to the output end of the high-pressure gas storage tank 21, and the multiple leakage points 25 are individually controlled by the flow regulating valve 24.

[0073] In this embodiment, the gas leakage module is used to simulate gas leakage at a specific location (i.e., the location of the leakage point 25). The high-pressure gas storage tank 21 contains a mixed gas and nitrogen that meets the pressure regulation requirements. The gas pipeline 22 is connected through the reserved port of the power channel (i.e., the leakage point 25) to simulate the diffusion of gas from the leakage point 25 to the power channel. This embodiment uses the flow control valve 24 to control the gas leakage rate and flow rate to ensure the controllability of the leakage scenario in the experimental environment. The leakage point 25 is used to simulate the leakage of various gases (such as natural gas, coal gas, etc.). When the gas leakage simulation stops or an accident occurs, the flow control valve 24 is turned off to block the high-pressure gas storage tank 21 from delivering gas to the power channel. At the same time, the check valve 23 can prevent gas backflow to ensure the safety of the experiment.

[0074] As shown in FIG. 3( a) and FIG. 3( b), the slope adjustment module includes a support frame 31, a driving assembly, and an adjusting assembly; the top of the support frame 31 is fixedly connected to the bottom of the power channel module, the adjusting assembly is movably connected to the bottom of the support frame 31, and the output end of the driving assembly is movably connected to the adjusting assembly to drive the adjusting assembly to lift the power channel module and adjust the slope of the power channel module;

[0075] The driving assembly includes a base 321, a hydraulic solenoid valve 322 and a driving gear 323; the fixed end of the hydraulic solenoid valve 322 is fixedly connected to the base 321, and the movable end of the hydraulic solenoid valve 322 is rotatably connected to the driving gear 323;

[0076] The adjustment assembly includes a movable rack 331, a bottom plate 332, a movable plate 333, an upper support plate 334, a first lifting arm 335, a second lifting arm 336, a third lifting arm 337 and a fourth lifting arm 338; the first lifting arm 335 is symmetrically arranged with the second lifting arm 336, and the third lifting arm 337 is symmetrically arranged with the fourth lifting arm 338;

[0077] The bottom plate 332 is fixedly connected to the bottom of the support frame 31, and a movable slot is provided on one side of the bottom plate 332. The movable rack 331 is slidably provided in the movable slot. One end of the movable rack 331 is meshed and connected with the driving gear 323, and the other end of the movable rack 331 is hinged to the bottom of the first lifting arm 335. The bottom of the second lifting arm 336 is hinged to the other side of the base 321.

[0078] One side of the movable plate 333 is hinged to the top of the first lifting arm 335, and a slide groove is provided on the other side of the movable plate 333. The top of the second lifting arm 336 is slidably arranged in the slide groove. The bottom of the third lifting arm 337 is hinged to the top of the second lifting arm 336. The bottom of the fourth lifting arm 338 is hinged to the side of the movable plate 333 away from the slide groove.

[0079] One side of the upper supporting plate 334 is hinged to the top of the third lifting arm 337 , and the other side of the upper supporting plate 334 is provided with a slide groove, and the top of the fourth lifting arm 338 is slidably disposed in the slide groove.

[0080] In this embodiment, the slope adjustment module is used to simulate the gas diffusion behavior of the power channel under different terrain conditions. The driving component is used to control the lifting height of the adjustment component. The hydraulic solenoid valve 322 drives the gear 323 to mesh and rotate with the movable rack 331. The movable rack 331 slides in the movable slot of the bottom plate 332, driving the first lifting arm 335 to lift the movable plate 333. When the movable plate 333 moves away from the bottom plate 332, the second lifting arm 336 slides in the slide slot and plays a role in supporting the movable plate 333, and drives the third lifting arm 336 hinged to the second lifting arm 336. The lifting arm 337, the third lifting arm 337 lifts the upper supporting plate 334, and when the upper supporting plate 334 moves away from the movable plate 333, the fourth lifting arm 338 slides in the slide groove and plays a role of supporting the movable plate 333, thereby realizing the slope adjustment of the power channel to meet the testing requirements of different terrains. The slope of the power channel is adjusted by hydraulics, which has the characteristics of high precision and smooth process, and ensures the controllability of the slope change in the simulation process. The device can adjust the slope continuously or in stages according to actual test requirements, which is convenient for observing different trends of gas diffusion and has the advantage of repeatable operation.

[0081] like Figure 4 As shown, the sensor module includes a sensor array 41 disposed in the power channel module; a plurality of the sensor arrays 41 are symmetrically arranged on both sides of the leakage point 25, and the sensor array 41 includes gas sensors uniformly distributed along the height direction of the power channel;

[0082] by Figure 4 For example, the leakage point 25H is set at the bottom of the power channel module, and a sensor array 41S1, S2, and S3 are set on one side of the leakage point 25, and the sensor array 41S1 has gas sensors S11, S12, and S13 evenly distributed along the height direction of the power channel; the other end of the leakage point 25 is set with a sensor array 41F1, F2, and F3, and the sensor array 41F1 is symmetrically arranged with the sensor S1.

[0083] In this embodiment, the sensor module is used to collect the real-time gas concentration in the power channel. The sensitivity of the sensor should meet the minimum concentration that can detect trace gas leakage. By setting multiple sensor arrays 41 on both sides of the leakage point 25, the gas concentration along the slope and against the slope on both sides of the leakage point 25 under a certain slope condition are captured, and the diffusion of gas under different slopes is analyzed in real time. After data analysis, the position of the sensor array 41 should be optimized based on the analysis results of the slope adjustment and the gas diffusion law, providing a theoretical basis and technical support for the layout of the gas monitoring equipment installed in the power channel, ensuring the comprehensiveness and accuracy of the gas monitoring range.

[0084] like Figure 2 As shown, the data acquisition and analysis module includes a data acquisition unit, an information synchronizer 53, a camera 52, a visual window 51 and a laser light source 55; the input end of the data acquisition unit is respectively connected to the output ends of multiple sensors, the input end of the data acquisition unit is connected to the input end of the information synchronizer 53, the input end of the information synchronizer 53 is connected to the common connection point of the flow regulating valve 24 and the check valve 23, the output end of the information synchronizer 53 is connected to the laser light source 55, tracer particles are arranged inside the power channel module, and a visual window 51 is arranged on the outside of the power channel module, and the camera 52 records the movement trajectory of the tracer particles through the visual window 51.

[0085] In this embodiment, the data acquisition and analysis module is used to receive the gas concentration data collected by the sensor module and perform gas diffusion behavior analysis. The data acquisition and analysis module is connected to the control system, and uses the recorded gas concentration data to form a diffusion trend diagram over time and space, providing a scientific basis for the optimal layout of the gas monitoring sensor. The data acquisition and analysis module has the functions of gas leak warning and historical data backtracking, and can be used for gas leak prediction and gas leak risk assessment. At the same time, the control system can analyze the gas diffusion path and law based on the data fed back by the data acquisition and analysis module, and warn of the dangerous points of gas diffusion under different slope conditions, provide theoretical support for the optimal installation position of the sensor, and optimize the coverage of sensor monitoring.

[0086] The data acquisition module converts the collected information into digital signals, and outputs them as standardized data using signal processing technology according to a specific protocol. The information synchronizer 53 cooperates with the camera 52, the flow control valve 24 and the laser sheet light source 55 according to the output standardized data, and uses the laser sheet light source 55 to visualize the distribution and movement of tracer particles in the power channel along with the gas diffusion, and records the gas diffusion through the camera.

[0087] Furthermore, as shown in Figures 5(a) and 5(b), the present invention provides a gas diffusion monitoring device in an electric power channel based on slope adjustment, which also includes a pipe fitting 61; the pipe fitting 61 is used to connect multiple electric power channel modules, and the pipe fitting 61 is an L-shaped pipe fitting 61 or a T-shaped pipe fitting 61.

[0088] Taking the T-shaped power channel formed by splicing T-shaped pipe fittings 61 as an example, when the gas diffuses in the T-shaped power channel and diffuses in two directions at the fork of the power channel, the gas diffusion rate will decrease, or the gas will gather in a certain direction. The T-shaped pipe fittings can be used to construct the above-mentioned simulation scenario, obtain monitoring data through the sensor module, and then analyze the impact of the T-shaped power channel on the diffusion and aggregation of gas.

[0089] In this embodiment, pipe fittings 61 of different shapes can connect multiple power channel modules, and the structural changes of the entire power channel can be achieved by splicing. Power channels that meet experimental simulation requirements can be spliced ​​according to working conditions and scene requirements, which is convenient for analyzing the influence of power channels with different structures and shapes on gas diffusion and aggregation, and has good practicality.

[0090] Embodiment 2

[0091] like Figure 6 As shown, the present invention also provides a method for monitoring gas diffusion in a power channel based on slope adjustment, comprising the following steps:

[0092] S1. Use the sensor module to collect the real-time gas concentration on both sides of the leakage point and determine the gas diffusion direction on both sides of the leakage point;

[0093] Specifically, when the response speed of the sensor array on one side of the leakage point is higher than the response speed of the sensor array on the other side of the leakage point, it is determined that the gas diffusion direction on one side of the leakage point is downslope diffusion, and the gas diffusion direction on the other side of the leakage point is reverse slope diffusion;

[0094] In this embodiment, since the power channel often has a certain slope in a complex environment, when the gas diffuses from the leakage point into the power channel, it cannot be guaranteed to diffuse evenly on both sides. When the gas has a slope, the diffusion conditions on both sides of the power channel are different. The real-time gas concentration is collected by using sensor arrays arranged on both sides of the leakage point. According to the response of the sensor, it can be determined whether the current sensor array is located on the slope side or the reverse slope side of the leakage point, and whether the gas diffuses along the slope or against the slope at the current sensor array position.

[0095] S2, continuously collect the real-time gas concentration of the sensor on the reverse slope side to determine the feasibility of continuous reverse diffusion of the gas;

[0096] Specifically, the real-time gas concentration data of the sensor on the reverse slope side is continuously collected to determine whether the gas can continue to diffuse in the reverse direction. If the gas cannot continue to diffuse in the reverse direction, the diffusion boundary and gas concentration on the reverse slope side are recorded; if the gas can continue to diffuse in the reverse direction, step S3 is executed to calculate the gas diffusion rate of the reverse slope diffusion.

[0097] Specifically, if the multiple sensor arrays located on the reverse slope side respond continuously over time, it means that the reverse slope side can continue to diffuse in the reverse direction; if the multiple sensor arrays located on the reverse slope side have no response or the gas concentration data that changes over time remains unchanged, it means that the reverse slope side cannot continue to diffuse in the reverse direction, then the diffusion boundary and gas concentration on the reverse slope side are recorded, and the maximum value of the dangerous boundary and the maximum concentration that the gas reverse diffusion can reach under this slope condition are recorded, to provide a theoretical basis and technical support for the layout of gas monitoring equipment installed in the power channel, and to optimize the installation position of the sensor on the reverse slope side and the coverage of sensor monitoring.

[0098] S3, respectively recording the response time of adjacent sensor arrays and the interval distance of adjacent sensor arrays, and respectively calculating the gas diffusion rate of down-slope diffusion and reverse-slope diffusion;

[0099] The gas diffusion rate along the slope is calculated using the following formula:

[0100]

[0101] Where V diff1 represents the gas diffusion rate along the slope, Δx represents the spacing between adjacent sensor arrays along the slope, and Δt1 represents the difference in response time of adjacent sensor arrays along the slope, that is, the time difference for the gas to reach the adjacent sensor arrays along the slope.

[0102] The gas diffusion rate of reverse slope diffusion is calculated using the following formula:

[0103]

[0104] Where V diff2 represents the gas diffusion rate of the reverse slope diffusion, Δy represents the spacing between adjacent sensor arrays on the reverse slope side, and Δt2 represents the difference in response time of adjacent sensor arrays on the reverse slope side, that is, the time difference for the gas to reach the adjacent sensor arrays on the reverse slope side.

[0105] The above formula can clearly express the relationship between the response time of the sensor array on different sides and the gas diffusion rate. In particular, in an actual inclined power channel with a slope, the gas diffusion rate will change due to the factors of the inclination angle and airflow convection.

[0106] Furthermore, this embodiment can fit a more accurate gas diffusion rate model by combining the gas diffusion rates calculated by multiple adjacent sensor arrays.

[0107] S4. Adjust the slope of the power channel through the slope adjustment module, adjust the gas leakage in the power channel through the gas leakage module, revise the adjusted gas diffusion coefficient, and update the gas diffusion rate of the slope diffusion and the reverse slope diffusion respectively; the gas diffusion coefficient includes the leakage diffusion coefficient, the slope diffusion coefficient and the reverse slope diffusion coefficient;

[0108] In this embodiment, the driving component is used to adjust the slope of the power channel, and the flow control valve is used to adjust the leakage amount of the gas injected into the power channel. The value is adjusted to a specified value according to the experimental working conditions to simulate the gas leakage in the power channel under different terrain conditions.

[0109] S41. In order to more accurately express the relationship between the gas diffusion rate, leakage and slope, the adjusted leakage diffusion coefficient is revised using the following formula:

[0110] k(Q)=k0*(1+γQ)

[0111] Wherein, k(Q) represents the leakage diffusion coefficient, k0 represents the reference leakage diffusion coefficient, γ represents the leakage adjustment parameter, which reflects the influence of leakage on the gas diffusion rate, and Q represents the gas leakage.

[0112] In this embodiment, the diffusion behavior of the gas is closely related to the gas concentration, and further to the gas leakage. According to the above formula, when the gas leakage Q increases, the leakage diffusion coefficient k(Q) increases accordingly, and the gas diffusion rate shows a nonlinear growth relationship with the increase in leakage. The leakage adjustment parameter γ determines the amplifying effect of the increase in leakage on the gas diffusion rate.

[0113] S42. Revise the adjusted downslope diffusion coefficient using the following formula:

[0114] A(θ)=A0*[1+αsin(θ)]

[0115] Where A(θ) represents the down-slope diffusion coefficient, A0 represents the benchmark down-slope diffusion coefficient, α represents the down-slope diffusion adjustment parameter, which reflects the influence of the slope on the down-slope diffusion rate of the gas, and θ represents the slope of the power channel.

[0116] In this embodiment, taking into account the different diffusion states of the gas on the upslope side and the downslope side, when the slope θ of the power channel is larger, it means that the slope of the power channel is steeper, the upslope diffusion coefficient A(θ) is larger, and the downslope diffusion rate of the gas is faster.

[0117] S43. Revise the adjusted reverse slope diffusion coefficient using the following formula:

[0118] B(θ)=B0*[1-βsin(θ)]

[0119] Wherein, B(θ) represents the reverse slope diffusion coefficient, B0 represents the benchmark reverse slope diffusion coefficient, β represents the reverse slope diffusion adjustment parameter, which reflects the hindering effect of the slope on the reverse slope diffusion, and θ represents the slope of the power channel. When the slope θ of the power channel is larger, the steeper the slope of the power channel is, the stronger the hindering effect of the gas reverse slope diffusion is.

[0120] S44. Update the gas diffusion rate along the slope using the following formula:

[0121] V′ diff1 =A(θ)*k(Q)*Q*cos(θ)*V diff1

[0122] Where V′ diff1 It represents the updated gas diffusion rate along the slope. By measuring the response time Δt1 and spacing Δx of the adjacent sensor arrays along the slope, combined with the adjusted slope θ and leakage amount Q, the change law of the gas diffusion rate on the along-slope side is corrected.

[0123] S45. Update the gas diffusion rate of the reverse slope diffusion using the following formula:

[0124] V′ diff2 =B(θ)*k(Q)*Q*cos(θ)*V diff2

[0125] Where V′ diff2 It represents the gas diffusion rate of the updated reverse slope diffusion. By measuring the response time Δt2 and spacing Δy of the adjacent sensor arrays on the reverse slope side, combined with the adjusted slope θ and leakage amount Q, the change law of the gas diffusion rate on the reverse slope side is corrected.

[0126] S5. Establish a data set for revising the gas diffusion coefficient, fit the correlation between the gas diffusion direction, leakage amount and slope, and establish a gas diffusion prediction model;

[0127] Specifically, in practical applications, the gas concentration data on both sides of the leakage point are collected through the sensor module, the adjustment parameters γ, α, β in the model are fitted, and the reference diffusion coefficients A0 and B0 are adjusted, so that the model can more accurately study the gas diffusion behavior in the power channel under different leakage amounts and slope conditions, and further can be used to predict the gas diffusion rate in similar situations.

[0128] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas diffusion monitoring device in a power channel based on slope adjustment, characterized in that: It includes power channel module, gas leakage module, slope adjustment module, sensor module and data acquisition and analysis module; The power channel module includes a cable trench, a power well, and a power pipeline; a plurality of the cable trenches are connected in sequence, the power pipeline is laid in the cable trench, and both ends of the power well are connected to the cable trench; The gas leakage module comprises a high-pressure gas storage tank, a gas pipeline, a check valve, a flow regulating valve and a leakage point; the high-pressure gas storage tank, the check valve, the flow regulating valve and the leakage point are connected in sequence through the gas pipeline, and the leakage point is arranged at the bottom of the power channel module; The slope adjustment module includes a support frame, a driving component, and an adjusting component; the top of the support frame is fixedly connected to the bottom of the power channel module, the adjusting component is movably connected to the bottom of the support frame, and the output end of the driving component is movably connected to the adjusting component to drive the adjusting component to lift the power channel module and adjust the slope of the power channel module; The sensor module includes a sensor array disposed in the power channel module; a plurality of the sensor arrays are symmetrically arranged on both sides of the leakage point, and the sensor array includes gas sensors uniformly distributed along the height direction of the power channel; The data acquisition and analysis module includes a data acquisition unit, an information synchronizer, a camera, a visual window and a laser light source; the input end of the data acquisition unit is respectively connected to the output ends of multiple sensors, the input end of the data acquisition unit is connected to the input end of the information synchronizer, the input end of the information synchronizer is connected to the common connection point of the flow regulating valve and the check valve, the output end of the information synchronizer is connected to the laser light source, tracer particles are arranged inside the power channel module, a visual window is arranged on the outside of the power channel module, and the camera records the movement trajectory of the tracer particles through the visual window.

2. The gas diffusion monitoring device in the power channel based on slope adjustment according to claim 1 is characterized in that: The driving assembly comprises a base, a hydraulic solenoid valve and a driving gear; the fixed end of the hydraulic solenoid valve is fixedly connected to the base, and the movable end of the hydraulic solenoid valve is rotationally connected to the driving gear.

3. The gas diffusion monitoring device in the power channel based on slope adjustment according to claim 3 is characterized in that: The adjustment assembly includes a movable rack, a bottom plate, a movable plate, an upper support plate, a first lifting arm, a second lifting arm, a third lifting arm and a fourth lifting arm; the first lifting arm is symmetrically arranged with the second lifting arm, and the third lifting arm is symmetrically arranged with the fourth lifting arm; The bottom plate is fixedly connected to the bottom of the support frame, a movable slot is provided on one side of the bottom plate, the movable rack is slidably arranged in the movable slot, one end of the movable rack is meshed and connected with the driving gear, the other end of the movable rack is hinged to the bottom of the first lifting arm, and the bottom of the second lifting arm is hinged to the other side of the base; One side of the movable plate is hinged to the top of the first lifting arm, a slide groove is provided on the other side of the movable plate, the top of the second lifting arm is slidably arranged in the slide groove, the bottom of the third lifting arm is hinged to the top of the second lifting arm; the bottom of the fourth lifting arm is hinged to the side of the movable plate away from the slide groove; One side of the upper supporting plate is hinged to the top of the third lifting arm, and the other side of the upper supporting plate is provided with a sliding groove, and the top of the fourth lifting arm is slidably arranged in the sliding groove.

4. The gas diffusion monitoring device in the power channel based on slope adjustment according to claim 1 is characterized in that: It also includes pipe fittings; the pipe fittings are used to connect multiple power channel modules, and the pipe fittings are L-shaped pipe fittings or T-shaped pipe fittings.

5. The method for monitoring gas diffusion in a power channel based on slope adjustment according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Using the sensor module to collect the real-time gas concentration on both sides of the leakage point, determine the gas diffusion direction on both sides of the leakage point; wherein, when the sensor array response speed on one side of the leakage point is higher than the sensor array response speed on the other side of the leakage point, it is determined that the gas diffusion direction on one side of the leakage point is downslope diffusion, and the gas diffusion direction on the other side of the leakage point is reverse slope diffusion; S2, continuously collecting the real-time gas concentration of the sensor on the reverse slope side to determine the feasibility of continuous reverse diffusion of the gas; if the gas cannot continuously diffuse in the reverse direction, then recording the diffusion boundary and gas concentration on the reverse slope side; if the gas can continuously diffuse in the reverse direction, then executing step S3 to calculate the gas diffusion rate of reverse diffusion; S3, respectively recording the response time of adjacent sensor arrays and the interval distance of adjacent sensor arrays, and respectively calculating the gas diffusion rate of down-slope diffusion and reverse-slope diffusion; S4. Adjust the slope of the power channel through the slope adjustment module, adjust the gas leakage in the power channel through the gas leakage module, revise the adjusted gas diffusion coefficient, and update the gas diffusion rate of the slope diffusion and the reverse slope diffusion respectively; S5. Establish a data set for revising the gas diffusion coefficient, fit the correlation between the gas diffusion direction, leakage amount and slope, and establish a gas diffusion prediction model.

6. The method for monitoring gas diffusion in a power channel based on slope adjustment according to claim 5 is characterized in that: In S3, the following formula is used to calculate the gas diffusion rate along the slope: Where V diff1 represents the gas diffusion rate along the slope, Δx represents the spacing between adjacent sensor arrays along the slope, and Δt1 represents the difference in response time between adjacent sensor arrays along the slope; The gas diffusion rate of reverse slope diffusion is calculated using the following formula: Where V diff2 represents the gas diffusion rate of the reverse slope diffusion, Δy represents the spacing between adjacent sensor arrays on the reverse slope side, and Δt2 represents the difference in response time between adjacent sensor arrays on the reverse slope side.

7. The method for monitoring gas diffusion in a power channel based on slope adjustment according to claim 6 is characterized in that: In S4, the adjusted leakage diffusion coefficient is revised using the following formula: k(Q)=k0*(1+γQ) Wherein, k(Q) represents the leakage diffusion coefficient, k0 represents the reference leakage diffusion coefficient, γ represents the leakage adjustment parameter, and Q represents the gas leakage.

8. The method for monitoring gas diffusion in a power channel based on slope adjustment according to claim 7 is characterized in that: In S4, the adjusted downslope diffusion coefficient is revised using the following formula: A(θ)=A0*[1+αsin(θ)] Where A(θ) represents the downslope diffusion coefficient, A0 represents the reference downslope diffusion coefficient, α represents the downslope diffusion adjustment parameter, and θ represents the slope of the power channel.

9. The method for monitoring gas diffusion in a power channel based on slope adjustment according to claim 8, characterized in that: In S4, the adjusted reverse slope diffusion coefficient is revised using the following formula: B(θ)=B0*[1-βsin(θ)] Where B(θ) represents the reverse slope diffusion coefficient, B0 represents the reference reverse slope diffusion coefficient, and β represents the reverse slope diffusion adjustment parameter.

10. The method for monitoring gas diffusion in a power channel based on slope adjustment according to claim 9, characterized in that: In S4, the following formula is used to update the gas diffusion rate along the slope: V′ diff1 =A(θ)*k(Q)*Q*cos(θ)*V diff1 Where V′ diff1 represents the gas diffusion rate along the slope after update; The gas diffusion rate for reverse slope diffusion is updated using the following formula: V′ diff2 =B(θ)*k(Q)*Q*cos(θ)*V diff2 Where V′ diff2 Represents the gas diffusion rate of the updated reverse slope diffusion.

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