Power Cable Channel and Municipal Gas Pipeline Network Coupling Risk Simulation Test Bench

Abstract

The present invention discloses a simulation test bench for the coupling risk between a power cable channel and a municipal gas pipeline network, which includes a coupling test box filled with soil, in which a gas pipeline and a power cable channel model are arranged; a leakage port is arranged at the part of the gas pipeline located in the soil, and a gas source leading to the first end of the gas pipeline is also included; a gas sensor is arranged in the soil between the gas pipeline and the power cable channel model; ventilation holes are arranged at both ends of the power cable channel model, and an air inlet is arranged at the part of the power cable channel model located in the soil; a gas sampling port is also arranged on the power cable channel model, and a gas sampling sensor is arranged at the gas sampling port; a data monitoring and analysis unit is also included, and the gas sensor and the gas sampling sensor are connected to the data monitoring and analysis unit. The advantages of the present invention are as follows: it can carry out the simulation test of the coupling risk between the power cable channel and the municipal gas pipeline network, and the time, manpower and material costs consumed are relatively low.

Description

Technical Field

[0001] The present invention relates to the technical field of power fire protection and public safety, and in particular to a risk simulation test platform for coupling a power cable channel with a municipal gas pipeline network. Background Art

[0002] With the acceleration of urbanization, urban distribution networks are being built in large numbers in urban areas. They are mostly built around urban roads and cross-laid with water supply, gas, and heat pipelines. During the underground operation of the gas pipeline network, if it encounters corrosion and other conditions, it is prone to leakage. If the road surface is hardened, the gas cannot evaporate to the surface, and it is easy to diffuse and accumulate in adjacent power cable channels and other spaces. If the power cable joint fails and discharges, it is very likely to cause risk accidents such as explosions and fires. In order to cope with the occurrence of such risk accidents, it is urgent to understand the law of diffusion and accumulation of gas in the power cable channel after leakage, to grasp the risk points of gas accumulation inside the power cable channel, and to provide a basis for optimizing the layout of combustible gas detectors in the power cable channel.

[0003] The leakage and diffusion of municipal gas pipelines in different soils after leakage is studied. At the same time, a scaled-down experimental study is conducted on the entire process of gas leakage and diffusion to the power cable channel. The diffusion and accumulation of gas in the power cable channel under different leakage point conditions is also studied.

[0004] At present, scientific research institutes have built full-scale underground pipeline coupling risk test benches, specifically including municipal gas, water supply, heat and other underground pipelines. In the prior art, the Chinese invention patent with publication number CN103712755B discloses a test device for simulating natural gas leakage in the soil, the test device includes a compressed gas cylinder, a pressure reducing valve, a gas flow meter, a PC computer, a pressure hose, a hard pipe, a gas buffer cylinder, a combustible gas probe, a multi-channel combustible gas probe controller, a waterproof shielded cable and a rigid hose, etc., wherein the gas buffer cylinder and the combustible gas probe are buried in the outdoor soil, and the combustible gas probe buried underground can be zeroed and calibrated through the rigid hose. Open the pressure reducing valve of the natural gas compressed gas cylinder, fill the gas buffer cylinder with natural gas through the gas flow meter, the pressure hose and the hard pipe in turn, use the combustible gas probe buried underground to collect the gas concentration leaked from the gas buffer cylinder, and study the diffusion law of natural gas in the soil after the natural gas pipeline leaks, so as to provide technical support for the prevention and disposal of natural gas pipeline leakage accidents. However, the existing technology does not include urban power cable channels, and does not have the conditions for conducting targeted experimental research. At the same time, the time, manpower and material costs of conducting a full-scale experiment are relatively high. Summary of the invention

[0005] The technical problem to be solved by the present invention is:

[0006] In the prior art, there are technical problems that it is impossible to carry out a coupling risk simulation experiment between a power cable channel and a municipal gas pipeline network, and the time, labor, and material costs required for carrying out a full-scale experiment are relatively high.

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

[0008] A coupling risk simulation test bench for a power cable channel and a municipal gas pipeline network, including a coupling test box filled with soil, in which a gas pipeline and a power cable channel model are arranged;

[0009] A leakage port is arranged at the part of the gas pipeline located in the soil, and it also includes a gas source leading to the first end of the gas pipeline, and the second end of the gas pipeline is sealed;

[0010] Gas sensors are arranged in the soil between the gas pipeline and the power cable channel model;

[0011] Vent holes leading to the outside of the coupling test box are arranged at both ends of the power cable channel model, and an air inlet is arranged at the part of the power cable channel model located in the soil;

[0012] A gas sampling port is also arranged on the power cable channel model, and a gas sampling sensor is arranged at the gas sampling port;

[0013] It also includes a data monitoring and analysis unit, and the gas sensors and gas sampling sensors are connected to the data monitoring and analysis unit.

[0014] The coupling risk simulation test bench for the power cable channel and the municipal gas pipeline network in the present invention can realize the whole process simulation of the diffusion and accumulation of leaked gas from the gas pipeline into the power cable channel, and automatically sample the parameters of the combustible gas leaked in the soil and the channel through the gas sensors and gas sampling sensors. This test bench can simulate the diffusion and accumulation process of gas in the power cable channel under different working conditions such as different soils. When multiple air inlets are arranged, only one filling of soil is required in the test box body, and the diffusion and accumulation of gas in the cable channel under different air inlet working conditions can be simulated, which saves time and effort as a whole, has a relatively low construction cost, and has good economy.

[0015] Optimally, the coupling test box is in the shape of a cuboid with an open top.

[0016] Optimally, through holes for the gas pipeline and the power cable channel model to pass through are arranged on the coupling test box, and buckles fixed on the coupling test box are arranged at the through holes. The gas pipeline and the power cable channel model pass through the corresponding buckles and are fixed in the buckles, and seals are provided between the gas pipeline, the power cable channel model and the corresponding through holes.

[0017] Optimally, a gas pressure and flow tester is arranged at the first end of the gas pipeline.

[0018] Optimized, a plurality of air inlets are provided;

[0019] The air inlet includes an air inlet pipe provided on the power cable channel model, a filter screen cover is provided at the outer end of the air inlet pipe, and a gas solenoid valve is provided at the inner end of the air inlet pipe.

[0020] The filter screen cover can block sundries such as soil from entering the power cable channel model, and the gas solenoid valve facilitates the control of the on-off of different air inlets, thereby simulating the working conditions of air intake at different positions, and having a wider application range.

[0021] Optimized, a plurality of layers of the gas sensors are arranged up and down.

[0022] Optimized, the gas sampling port is arranged at the top of the power cable channel model.

[0023] Optimized, the gas sensor adopts a gas concentration sensor;

[0024] The gas sampling sensor includes a gas concentration sensor and a temperature sensor.

[0025] Optimized, the gas source includes a methane gas cylinder, a nitrogen gas cylinder, and a gas dynamic proportioning instrument;

[0026] The methane gas cylinder and the nitrogen gas cylinder are respectively connected to the inlet of the gas dynamic proportioning instrument through pipelines, and the outlet of the gas dynamic proportioning instrument is connected to the first end of the gas pipeline.

[0027] During actual simulation, according to actual requirements, adjusting the gas dynamic proportioning instrument can realize the adjustment of the mixing ratio of methane and nitrogen, so as to meet the simulation requirements.

[0028] Optimized, a gas control valve is arranged between the outlet of the gas dynamic proportioning instrument and the gas pipeline.

[0029] The advantages of the present invention are as follows:

[0030] 1. The power cable channel and municipal gas pipeline coupling risk simulation test bench in the present invention can realize the whole process simulation of the diffusion and accumulation of leaked gas in the gas pipeline into the power cable channel, and automatically sample the parameters of combustible gas leaked in the soil and the channel through the gas sensor and the gas sampling sensor. This test bench can simulate the diffusion and accumulation process of gas in the power cable channel under different soil and other working conditions. When multiple air inlets are provided, only one filling of soil is required in the experimental box body, and the diffusion and accumulation of gas in the cable channel under different air inlet working conditions can be simulated, which is time-saving and labor-saving as a whole, with a relatively low construction cost and good economy.

[0031] 2. The filter screen cover can prevent sundries such as soil from entering the power cable channel model. The gas solenoid valve facilitates the control of the opening and closing of different air inlets, thereby simulating the working conditions of air intake at different positions, and has a wider application range.

[0032] 3. During actual simulation, according to actual requirements, adjusting the gas dynamic ratio instrument can achieve the adjustment of the methane-nitrogen ratio, thereby meeting the simulation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram (front view perspective) of the power cable channel and the municipal gas pipeline coupling risk simulation test bench in the embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of the air inlet in the embodiment of the present invention;

[0035] Among them,

[0036] Coupling experiment box - 1; buckle - 11; gas sensor - 12;

[0037] Gas pipeline - 2; leakage port - 21; gas pressure and flow tester - 22;

[0038] Power cable channel model - 3; ventilation hole - 31; air inlet - 32; sensor support fixing part - 33; sensor support - 34; gas sampling sensor - 35; air inlet pipeline - 321; filter screen cover - 322; gas solenoid valve - 323;

[0039] Gas source - 4; methane gas cylinder - 41; nitrogen gas cylinder - 42; gas dynamic ratio instrument - 43; pipeline - 44; gas control valve - 45;

[0040] Data monitoring and analysis unit - 5; data monitoring and analysis terminal - 51; data acquisition card - 52. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] As Figure 1As shown in the figure, this embodiment discloses a simulation test bench for the coupling risk between a power cable channel and a municipal gas pipeline network, which can be used to study the diffusion and accumulation laws of gas leakage from the municipal gas pipeline network into the adjacent power cable channel. Since the research is carried out indoors and gas is flammable and explosive, considering the safety of the experiment, the basic idea of the present invention is to use a mixed gas of 4% methane and 96% nitrogen for the experiment, avoiding the lower explosion limit of methane, reducing the percentage content of methane gas in the mixed gas but not affecting the diffusion and accumulation laws of methane gas in the soil and the channel, so as to safely and effectively simulate the diffusion and accumulation process of gas leakage into the adjacent power cable channel in the laboratory.

[0043] Specifically, as Figure 1 shown, the simulation test bench for the coupling risk between the power cable channel and the municipal gas pipeline network includes a coupling test box 1, a gas pipeline 2, a power cable channel model 3, a gas source 4, and a data monitoring and analysis unit 5.

[0044] As Figure 1 shown, the coupling test box 1 is in the shape of a cuboid with an open top. Specifically, the coupling test box 1 is formed by welding five steel plates, namely one bottom plate and four side plates. The coupling test box 1 is filled with soil, and a gas pipeline 2 and a power cable channel model 3 are arranged in the soil. Further, the gas pipeline 2 and the power cable channel model 3 are arranged in parallel, and the power cable channel model 3 is located above the gas pipeline 2.

[0045] Specifically, as Figure 1 shown, the coupling test box 1 is provided with through holes for the gas pipeline 2 and the power cable channel model 3 to pass through. At the through holes, there are buckles 11 fixed on the coupling test box 1. The gas pipeline 2 and the power cable channel model 3 pass through the corresponding buckles 11 and are fixed in the buckles 11. The gas pipeline 2 and the power cable channel model 3 are sealed with the corresponding through holes. The buckles 11 are made of steel, and the cross-sectional shape of the steel buckles is adapted to that of the gas pipeline 2 and the power cable channel model 3. The steel buckles are installed on the coupling test box 1 by screws. Further, the steel buckles are sealed with the coupling test box 1, and a rubber pad or plastic film is arranged inside the steel buckles to achieve the seal between the steel buckles and the gas pipeline 2 and the power cable channel model 3.

[0046] The gas pipeline 2 is made of steel and has a circular cross-section, as Figure 1As shown, a leakage port 21 is provided at the part of the gas pipeline 2 located in the soil. Further, multiple leakage ports 21 can be provided. A valve can be provided at the leakage port 21 to control its opening and closing. The aperture of the leakage port 21 can be set according to experimental needs, and the aperture can be set to be between 1 mm and 5 mm. It also includes a gas source 4 leading to the first end of the gas pipeline 2, and the second end of the gas pipeline 2 is sealed. A gas pressure and flow rate tester 22 is provided at the first end of the gas pipeline 2 for detecting gas pressure and flow rate, which is a prior art and can be purchased commercially.

[0047] As Figure 1 shown, the gas source 4 includes a methane gas cylinder 41, a nitrogen gas cylinder 42, and a gas dynamic proportioning instrument 43. The gas dynamic proportioning instrument 43 is a prior art and can be purchased commercially; the methane gas cylinder 41 and the nitrogen gas cylinder 42 are respectively connected to the inlet of the gas dynamic proportioning instrument 43 through pipelines 44. The pipelines 44 are made of flexible hoses. Further, gas valves are provided on both the methane gas cylinder 41 and the nitrogen gas cylinder 42, and the pipelines 44 are connected to the gas valves. The outlet of the gas dynamic proportioning instrument 43 is connected to the first end of the gas pipeline 2. A gas control valve 45 is provided between the outlet of the gas dynamic proportioning instrument 43 and the gas pipeline 2.

[0048] As Figure 1 shown, gas sensors 12 are provided in the soil between the gas pipeline 2 and the power cable channel model 3; several layers of gas sensors 12 are arranged vertically. In this embodiment, four gas sensors 12 are provided in each layer, and a total of three layers are provided. The gas sensors 12 adopt gas concentration sensors for detecting gas concentration.

[0049] The power cable channel model 3 is made of acrylic material. The cross-section of the power cable channel model 3 is rectangular, and it is scaled according to the actual size ratio of the power cable trench to simulate the actual power cable channel. As Figure 1 shown, ventilation holes 31 leading to the outside of the coupling experiment box 1 are provided at both ends of the power cable channel model 3, and three ventilation holes 31 are provided at each end. These ventilation holes can enable the air inside the channel to flow with the outside, forming a micro-flow environment of the air inside the channel, which conforms to the actual situation of the power cable channel. Specifically, in this embodiment, the end face of the power cable channel model 3 is closed, and the ventilation holes 31 are provided on the top surface of the end of the power cable channel model 3.

[0050] As Figure 1 shown, an air inlet 32 is provided at the part of the power cable channel model 3 located in the soil. The air inlet 32 is located on the side of the power cable channel model 3; several air inlets 32 are provided; As Figure 2As shown in the figure, the air inlet 32 includes an air inlet pipe 321 provided on the power cable duct model 3. The gap between the air inlet pipe 321 and the power cable duct model 3 is fixed and sealed with strong glue. The air inlet pipe 321 is made of acrylic material. A filter cover 322 is provided at the outer end of the air inlet pipe 321. The filter cover 322 is installed on the outer end of the air inlet pipe 321 by threading. A gas solenoid valve 323 is provided at the inner end of the air inlet pipe 321.

[0051] As Figure 1 shown in the figure, a gas sampling port is also provided on the power cable duct model 3. The gas sampling port is provided at the top of the power cable duct model 3. A gas sampling sensor 35 is provided at the gas sampling port. The gas sampling sensor 35 includes a gas concentration sensor and a temperature sensor. Specifically, a flange is provided at the gas sampling port. The flange is connected to the sensor support frame. The gas sampling sensor 35 is fixed in layers along the support frame to sample the gas in the channel.

[0052] As Figure 1 shown in the figure, it further includes a data monitoring and analysis unit 5. The gas sensor 12 and the gas sampling sensor 35 are connected to the data monitoring and analysis unit 5. The data monitoring and analysis unit 5 includes a data monitoring and analysis terminal 51 and a data acquisition card 52 connected together. The gas sensor 12 and the gas sampling sensor 35 are connected to the data acquisition card 52. The data monitoring and analysis terminal 51 and the data acquisition card 52 are both of the prior art and can be purchased commercially.

[0053] Further, as Figure 1 shown in the figure, a sensor support frame fixing part 33 is installed at the gas sampling port. It is connected to the power cable duct model 3 by threading. The sensor support frame fixing part 33 and the sensor support frame 34 are connected by threading. The gas sampling sensor 35 and the sensor support frame 34 are welded into one body. The data cable is connected to the data acquisition card 52 through the middle hole of the sensor support frame fixing part 33. The gap between the middle hole and the data cable is sealed with putty to ensure airtightness. The data acquisition card uploads the monitoring data to the data monitoring and analysis terminal through the data cable.

[0054] During the experimental simulation, the gas control valve 45 is opened through the computer, and the gas valve of the methane gas cylinder 41 is manually opened. Methane enters the gas dynamic proportioner 43 through the pipeline 44 and the gas inlet of the gas dynamic proportioner. The nitrogen gas cylinder 42 is manually opened, and nitrogen enters the gas dynamic proportioner 43 through the pipeline 44 and the gas inlet. The gas dynamic proportioner 43 outputs the mixed gas to the gas pipeline 2 according to the set gas proportion parameters and output pressure. Observe whether the test parameters of the gas pressure and flow tester 22 are consistent with the set output pressure parameters. If they are consistent, continue the experiment; if not, it is necessary to check whether the operating conditions of the gas dynamic proportioner are normal. The output mixed gas will diffuse in the soil through the leakage port 21. The opening and closing of the gas solenoid valve 323 in the gas inlet 32 distributed on the side of the channel are controlled by the computer to simulate the working conditions of the damaged port on the side of one of the power cable channels. The data monitoring and analysis terminal 51 is turned on, and the gas concentration sensors and temperature sensors in the soil of the experimental box and the power cable channel model are started to monitor the gas concentration in the soil and the power cable channel model in real time, and at the same time monitor the gas temperature in the channel.

[0055] Through experimental simulation, the concentration distribution of the gas leakage in the soil and in the pipeline of the power cable channel model, as well as the distribution change law at different times, are monitored and analyzed. Thus, the diffusion and accumulation process of the gas pipeline leakage into the adjacent power cable channel is simulated. Furthermore, the risk points of gas accumulation in the power cable channel are analyzed and located. Then, corresponding emergency treatment measures can be proposed, which is of great significance for improving the safe operation level of the power cable channel.

[0056] Working principle:

[0057] As Figure 1 shown, the risk simulation test bench for the coupling of the power cable channel and the municipal gas pipeline network in the present invention can realize the full-process simulation of the diffusion and accumulation of the gas pipeline leakage into the power cable channel, and automatically sample the parameters of the combustible gas leaked in the soil and the channel through the gas sensor 12 and the gas sampling sensor 35. The test bench can simulate the diffusion and accumulation process of the gas in the power cable channel under different soil conditions. When multiple gas inlets 32 are provided, only one filling of soil is required in the experimental box to simulate the gas diffusion and accumulation in the cable channel under different gas inlet conditions, which is time-saving and labor-saving as a whole, with a relatively low construction cost and good economy.

[0058] The filter screen cover 322 can prevent sundries such as soil from entering the power cable channel model 3. The gas solenoid valve 323 is convenient for controlling the opening and closing of different gas inlets 32, and then simulating the working conditions of gas inlet at different positions, with a wider application range. During actual simulation, according to actual needs, the gas dynamic proportioner 43 can be adjusted to realize the adjustment of the methane-nitrogen ratio, so as to meet the simulation requirements.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A simulation test bench for the coupling risk between a power cable channel and a municipal gas pipeline network, characterized in that: It includes a coupling experiment box (1) filled with soil, in which a gas pipeline (2) and a power cable channel model (3) are arranged in the soil; A leakage port (21) is arranged at the part of the gas pipeline (2) located in the soil. There is also a gas source (4) leading to the first end of the gas pipeline (2), and the second end of the gas pipeline (2) is sealed; A gas sensor (12) is arranged in the soil between the gas pipeline (2) and the power cable channel model (3); Vent holes (31) leading to the outside of the coupling experiment box (1) are arranged at both ends of the power cable channel model (3), and an air inlet (32) is arranged at the part of the power cable channel model (3) located in the soil; A gas sampling port is also arranged on the power cable channel model (3), and a gas sampling sensor (35) is arranged at the gas sampling port; It also includes a data monitoring and analysis unit (5). The gas sensor (12) and the gas sampling sensor (35) are connected to the data monitoring and analysis unit (5). By monitoring and analyzing the concentration distribution of gas leakage in the soil and inside the power cable channel model pipeline and the distribution change law at different times, the diffusion and accumulation process of gas leakage from the gas pipeline to the adjacent power cable channel is simulated, and the gas accumulation risk points in the power cable channel are located.

2. The risk simulation test bench for the coupling of the power cable channel and the municipal gas pipeline network according to claim 1, characterized in that: The coupling experiment box (1) is in the shape of a cuboid with an open top.

3. The power cable channel and municipal gas pipeline network coupling risk simulation test bench according to claim 1, characterized in that: Through holes for the gas pipeline (2) and the power cable channel model (3) to pass through are arranged on the coupling experiment box (1). Clips (11) fixed on the coupling experiment box (1) are arranged at the through holes. The gas pipeline (2) and the power cable channel model (3) pass through the corresponding clips (11) and are fixed in the clips (11), and the gas pipeline (2) and the power cable channel model (3) are sealed with the corresponding through holes.

4. The power cable channel and municipal gas pipeline network coupling risk simulation test bench according to claim 1, characterized in that: A gas pressure and flow tester (22) is arranged at the first end of the gas pipeline (2).

5. The risk simulation test bench for the coupling of the power cable channel and the municipal gas pipeline network according to claim 1, wherein: A number of air inlets (32) are arranged; The air inlet (32) includes an air inlet pipe (321) arranged on the power cable channel model (3). A filter cover (322) is arranged at the outer end of the air inlet pipe (321), and a gas solenoid valve (323) is arranged at the inner end of the air inlet pipe (321).

6. The risk simulation test bench for the coupling of the power cable channel and the municipal gas pipeline network according to claim 1, characterized in that: Several layers of the gas sensor (12) are arranged vertically.

7. The risk simulation test bench for the coupling of the power cable channel and the municipal gas pipeline network according to claim 1, characterized in that: The gas sampling port is arranged at the top of the power cable channel model (3).

8. The power cable channel and municipal gas pipeline network coupling risk simulation test bench according to claim 1, characterized in that: The gas sensor (12) uses a gas concentration sensor; The gas sampling sensor (35) includes a gas concentration sensor and a temperature sensor.

9. The risk simulation test bench for the coupling of the power cable channel and the municipal gas pipeline network according to claim 1, wherein: The gas source (4) includes a methane gas cylinder (41), a nitrogen gas cylinder (42), and a gas dynamic proportioning instrument (43); The methane gas cylinder (41) and the nitrogen gas cylinder (42) are respectively connected to the inlet of the gas dynamic proportioning instrument (43) through pipelines (44), and the outlet of the gas dynamic proportioning instrument (43) is connected to the first end of the gas pipeline (2).

10. The risk simulation test bench for the coupling of the power cable channel and the municipal gas pipeline network according to claim 9, characterized in that: A gas control valve (45) is arranged between the outlet of the gas dynamic proportioning instrument (43) and the gas pipeline (2).

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