CN117147386B - Buried gas pipeline leakage diffusion simulation device - Google Patents
Buried gas pipeline leakage diffusion simulation device Download PDFInfo
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- CN117147386B CN117147386B CN202311128711.2A CN202311128711A CN117147386B CN 117147386 B CN117147386 B CN 117147386B CN 202311128711 A CN202311128711 A CN 202311128711A CN 117147386 B CN117147386 B CN 117147386B
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 32
- 238000004088 simulation Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 234
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 98
- 239000010959 steel Substances 0.000 claims abstract description 98
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 41
- 239000002689 soil Substances 0.000 claims abstract description 41
- 238000005259 measurement Methods 0.000 claims abstract description 29
- 238000002360 preparation method Methods 0.000 claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 238000009826 distribution Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000002474 experimental method Methods 0.000 claims description 45
- 238000011049 filling Methods 0.000 claims description 9
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- 238000009825 accumulation Methods 0.000 description 4
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- 238000011161 development Methods 0.000 description 3
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
Abstract
The invention relates to a buried gas transmission pipeline leakage diffusion simulation device which comprises a pressure-bearing steel mesh, a boxing and sealing plate mechanism and a box shell, wherein the pressure-bearing steel mesh is a net-shaped box body, an upper opening of the pressure-bearing steel mesh is open, a mesh of the pressure-bearing steel mesh is an air vent, a sealing channel is arranged at the upper opening of the pressure-bearing steel mesh, a plurality of reinforcing rings are arranged outside a wall of the pressure-bearing steel mesh, a plurality of reinforcing belts are arranged at a bottom of the pressure-bearing steel mesh, reinforcing platforms are also uniformly arranged at the bottom of the pressure-bearing steel mesh, sealing plate clamping grooves, box clamping grooves and sealing plate positioning grooves are formed at the reinforcing platforms, and a support is arranged at each reinforcing platform; the pressure-bearing steel mesh is assembled with the boxing and sealing plate mechanism and the box body shell respectively, and the soil is filled in the preparation stage through the detachable assembly of the pressure-bearing steel mesh and the boxing and sealing plate mechanism; and the fully-closed experimental simulation is realized by assembling the pressure-bearing steel mesh and the box body shell, and the concentration distribution measurement in the soil after gas leakage is performed. The invention greatly reduces the blocking effect of the side wall of the box body on the gas, has accurate measurement result, and is safe and environment-friendly in experimental process.
Description
Technical Field
The invention relates to an experimental research device in the field of oil and gas storage and transportation engineering, in particular to a buried gas transmission pipeline leakage diffusion simulation device.
Background
With the rapid development of countries in the world, the energy demand is rising year by year, and fossil energy occupies the first energy consumption. However, the year-by-year reduction of fossil energy reserves and the environmental problems associated with combustion are contradictory to our current society development. Natural gas is used as a clean fuel, and has the advantages of huge reserves and clean combustion. Along with continuous exploration of natural gas hydrate on the sea floor, people can feel confident in the society. Related literature surveys show that the reserves of the seabed natural gas hydrate are huge and are 2 times of the total reserves of the petroleum, the coal and the natural gas which are detected globally, which is equivalent to 50 times of the conventional natural gas reserves, and only the global seabed natural gas hydrate can be used for 1000 years by human beings. Before the new energy technology matures and stabilizes, natural gas is necessarily used as the dominant force army of fossil energy to bear the pulse of negative national development. The main transport mode of natural gas is pipeline transport, and most are buried pipelines, with risk of leakage. In recent years, the accidents of gas pipeline leakage and explosion are of all kinds, and bring serious threat to the life and property safety of natural gas users. Research on gas line leak diffusion has focused mainly on three aspects: the experiment, the theoretical analysis and the numerical simulation are used as important research means in the fluid mechanics, and have the advantages of objective and real results, and meanwhile, the accuracy of the theoretical analysis and the numerical simulation needs to be verified. At present, leakage and diffusion experiments of buried gas pipelines are mainly divided into two types: firstly, an indoor experiment box is adopted for experiments, and secondly, an outdoor experiment pit digging method is adopted. The experimental error is increased due to the blocking effect of the side walls of the box body on gas diffusion in the indoor experimental box in the prior study, and the blocking and accumulating effect of the box body on gas is increased along with the increase of the experimental time, so that the error is increased. And to outdoor experiment hole, be difficult to realize the recovery of experiment gas, lead to combustible gas to get into the atmosphere, increased the danger and the environmental pollution of experiment.
Disclosure of Invention
The invention aims to provide a buried gas pipeline leakage diffusion simulation device which is used for solving the problems that in the prior art, the leakage diffusion experiment of the buried gas pipeline has large error or experimental gas is difficult to recover and pollute the environment.
The technical scheme adopted for solving the technical problems is as follows: the buried gas transmission pipeline leakage diffusion simulation device comprises a pressure-bearing steel mesh, a boxing and sealing plate mechanism and a box shell, wherein the pressure-bearing steel mesh is a net-shaped box, an upper opening of the pressure-bearing steel mesh is open, a mesh of the pressure-bearing steel mesh is an air vent, a sealing channel is arranged at the upper opening of the pressure-bearing steel mesh, a plurality of reinforcing rings are arranged outside a wall of the pressure-bearing steel mesh, a plurality of reinforcing belts are arranged at a bottom of the pressure-bearing steel mesh, reinforcing platforms are also uniformly arranged at the bottom of the pressure-bearing steel mesh, sealing plate clamping grooves, box clamping grooves and sealing plate positioning grooves are formed at the reinforcing platforms, and a support is arranged at each reinforcing platform; in the experiment preparation stage, a boxing and sealing plate mechanism is detachably arranged outside the pressure-bearing steel mesh to form a box body with an open upper opening, and soil boxing, pipeline landfill and detector landfill are carried out; after the experiment preparation stage is completed, the box loading sealing plate mechanism is detached from the outside of the pressure-bearing steel mesh, and in the experiment measurement stage, the box shell is detachably surrounded outside the pressure-bearing steel mesh after filling to form a closed experiment box, and concentration distribution measurement in soil after gas leakage is carried out; the case body shell comprises a sealing cover and a case body, wherein an exhaust port is arranged on the sealing cover, a gas collecting port is arranged on the upper part of the case body, and a gas inlet is arranged at the bottom of the case body.
The boxing and sealing plate mechanism in the scheme comprises a plurality of side short sealing plates, a plurality of side long sealing plates, two bottom inner sealing plates, two bottom outer sealing plates and a plurality of binding belts; the inner sides of each side short sealing plate and each side long sealing plate are uniformly provided with plugging piles, the outer sides of the side short sealing plates and the side long sealing plates are provided with binding band positioning grooves, each side short sealing plate and each side long sealing plate are inserted between two adjacent reinforcing rings, each plugging pile is inserted into a corresponding pressure-bearing steel mesh vent hole to plug the vent hole, each layer of side short sealing plate and each side long sealing plate are fastened outside the pressure-bearing steel mesh wall through binding bands, and the head ends and the tail ends of the binding bands are fastened through fixing bolts and nuts; the bottom inner sealing plate and the bottom outer sealing plate are respectively inserted into corresponding sealing plate clamping grooves and are fixed by bolts through sealing plate positioning grooves.
In the scheme, the shell body is a combined box body with an open upper opening, which is formed by assembling a left frame body, a middle frame body and a right frame body together, wherein the upper opening of the combined box body is provided with a circle of sealing plate, a circle of sealing groove is arranged on the sealing plate, and the joint of the left frame body, the middle frame body and the right frame body is in sealing connection with a sealing male opening through a sealing female opening; the outer wall of the combined box body is provided with a binding band positioning groove, and the binding band is clamped into the binding band positioning groove to fasten the left frame body, the middle frame body and the right frame body into a whole; the sealing groove is matched with the sealing cover to realize sealing connection, and the sealing plate is connected with the sealing channel of the pressure-bearing steel mesh to realize top end positioning and sealing.
The sealed lid is square frame in above-mentioned scheme, and sealed cover still sets up the handle, and sealed lower port sets up round closing plate, and the seal groove cooperation of closing plate and shell body realizes sealed lid, prevents that experimental gas from getting into atmospheric environment.
Advantageous effects
1. Aiming at the defects that the experimental result caused by the blocking and accumulation effect of the side wall of the box body of the existing indoor experimental box on the gas leakage and diffusion process is inaccurate and experimental errors are increased along with the extension of the measurement time, the vent design of the pressure-bearing steel net reduces the blocking and accumulation effect of the side wall of the box body of the existing experimental box on the gas diffusion, greatly reduces the blocking effect of the side wall of the box body on the gas and improves the accuracy of the measurement result.
2. The invention realizes the full sealing of the experimental process by the structural design to collect the experimental gas, prevents the combustible gas from entering indoor and outdoor atmospheric environments, realizes the full sealing measurement of the experimental process, improves the safety of the experiment and prevents the combustible gas from entering the atmospheric environments to cause safety problems.
3. Aiming at the problem of environmental pollution caused by the fact that experimental gas is not easy to recover and enters the atmosphere in an outdoor experimental pit, the design of the exhaust port and the gas collecting port of the box body shell can realize the recovery of the experimental gas, avoid the environmental pollution caused by the fact that the gas enters the atmosphere, and realize the collection of the experimental gas in a fully-sealed experimental process, so that the gas is prevented from entering the atmosphere to reduce the environmental pollution.
4. In the prior art, the residual gas in the soil after the experimental measurement is finished is discharged slowly, the manual work amount is large by adopting a method of reloading the soil and filling the soil, and the manual work amount is large for the problem that the residual gas in the soil is difficult to empty after the inter-group experiment is finished.
5. Aiming at the defects and shortcomings of the existing buried gas pipeline leakage diffusion laboratory experiment box and the existing buried gas pipeline leakage diffusion laboratory experiment pit, the invention improves the accuracy of the indoor experiment and the safety and environmental protection of the outdoor experiment through structural design, and improves the simplicity of experimental operation.
6. The design of the pressure-bearing steel mesh reinforcing ring, the reinforcing belt and the reinforcing table meets the pressure-bearing strength of the pressure-bearing steel mesh, ensures the soil body containing capacity in the box body, and provides sufficient experimental research area and monitoring space.
7. The pressure-bearing steel mesh is used as a core component of the device, the clamping groove design can realize rapid assembly of the sealing plate and the box body shell, and the assembly and the positioning are completed by matching the positioning groove and the binding belt, so that the device is simple in structure and convenient to operate.
8. The side sealing plate structure is matched with the binding belt, so that the pressure-bearing steel mesh soil can be loaded in the preparation stage to prevent soil leakage, and meanwhile, the compaction effect of the soil boxing process is met, so that the influence of different soil compaction bearing degrees and porosities on the gas leakage diffusion process is studied.
9. According to the invention, the pressure-bearing steel mesh is assembled with the boxing and sealing plate mechanism and the box body shell respectively, so that the preparation stage (soil boxing) and the measurement stage (gas concentration measurement) of an experiment are separated, the advantages of simple structure and convenience in operation are achieved, the manual workload among groups is reduced through structural design, the defects of the existing indoor experiment box and outdoor experiment pit digging experiment method are overcome, and the accuracy of the experimental result, the process safety and the environment friendliness are improved.
Drawings
FIG. 1 is an external view of a buried gas pipeline leakage diffusion simulation apparatus at a preparation stage.
FIG. 2 is an exploded view of a buried gas pipeline leakage diffusion simulator-the preparation phase.
Fig. 3 is a construction diagram of a pressure-bearing steel mesh.
Fig. 4 is a front and back structure diagram of the side long seal plates and the side short seal plates.
Fig. 5 is a front and back structure diagram of the bottom inner seal plate and the bottom outer seal plate.
Fig. 6 is a block diagram of the support.
Fig. 7 is a structural diagram of a binding band.
FIG. 8 is an external view of a buried gas pipeline leakage diffusion simulator-measuring stage.
FIG. 9 is an exploded view of a buried gas line leak diffusion simulator-measurement phase.
Fig. 10 is a view showing the structure of the outer shell of the case.
Fig. 11 is a view showing the structure of the inner case of the case.
Fig. 12 is a structural view of the sealing cap.
In the figure:
the device comprises a pressure-bearing steel mesh 1, a side short sealing plate 2, a support 3, a bottom 4 inner sealing plate, a bottom 5 outer sealing plate, a side long sealing plate 6, a binding belt 7, a sealing cover 8, a box body outer shell 9, a box body inner shell 10, a plugging pile 11, a binding belt positioning groove 12, a fixing bolt and nut 13, a binding belt fastening hole 14, a sealing plate positioning hole 15, a positioning bolt 16 and a support positioning rod 17; the sealing plate 18, the sealing female port 19, the sealing male port 20, the positioning clamping plate 21, the gas collecting port 22, the sealing groove 23 and the gas inlet 24;
101 sealing channels, 102 ventilation holes, 103 reinforcing rings, 104 reinforcing belts, 105 reinforcing tables, 106 support positioning grooves, 107 sealing plate clamping grooves, 108 box clamping grooves and 109 sealing plate positioning grooves;
801 exhaust port, 802 handle, 804 wiring port.
Detailed Description
The buried gas pipeline leakage diffusion simulation device comprises a pressure-bearing steel mesh 1, a boxing and sealing plate mechanism and a box body shell, wherein the pressure-bearing steel mesh 1, the boxing and sealing plate mechanism and the box body shell are detachably assembled into different structures according to a preparation stage and a measurement stage to meet the working contents of the two stages, the preparation stage soil filling is realized through the pressure-bearing steel mesh 1 and the sealing plate, and the full-closed experimental measurement is realized after the pressure-bearing steel mesh and the box body shell are assembled. The preparation stage mainly comprises the filling of soil and the burying of pipelines and detectors, and the measurement stage comprises the measurement of concentration distribution in the soil after gas leakage. The pressure-bearing steel mesh is a meshed box body, the upper opening of the pressure-bearing steel mesh is an air vent 102, a sealing channel 101 is arranged at the upper opening of the pressure-bearing steel mesh, a plurality of reinforcing rings 103 are arranged outside the wall of the pressure-bearing steel mesh, a plurality of reinforcing belts 104 are arranged at the bottom of the pressure-bearing steel mesh, reinforcing platforms 105 are also uniformly arranged at the bottom of the pressure-bearing steel mesh, sealing plate clamping grooves 107, box clamping grooves 108 and sealing plate positioning grooves 109 are arranged at the reinforcing platforms, a support 3 is arranged at each reinforcing platform, the pressure-bearing steel mesh reinforcing rings, the reinforcing belts and the reinforcing platforms are designed, the pressure-bearing capacity of the side surfaces and the bottom surfaces of the soil boxing process is met, and the clamping grooves and the positioning grooves of the pressure-bearing steel mesh are designed, so that the positioning and the assembly of the sealing plates and the box body are met; compared with an indoor experiment box, the design of the pressure-bearing steel mesh greatly reduces the blocking effect of the box body side wall on gas, and improves the accuracy of the experiment. In the experiment preparation stage, a boxing and sealing plate mechanism is detachably arranged outside the pressure-bearing steel mesh to form a box body with an open upper opening, and soil boxing, pipeline landfill and detector landfill are carried out; after the experiment preparation stage is completed, the box loading sealing plate mechanism is detached from the outside of the pressure-bearing steel mesh, and in the experiment measurement stage, the box shell detachably surrounds the outside of the pressure-bearing steel mesh after filling to form a closed experiment box, and concentration distribution measurement in soil after gas leakage is performed.
The boxing and sealing mechanism comprises a plurality of side short sealing plates 2, a plurality of side long sealing plates 6, two bottom inner sealing plates 4, two bottom outer sealing plates 5 and a plurality of binding bands 7; the inner sides of each side short sealing plate 2 and each side long sealing plate 6 are uniformly provided with plugging piles 11, the outer sides of the side short sealing plates and the side long sealing plates are provided with binding band positioning grooves 12, each side short sealing plate and each side long sealing plate are inserted between two adjacent reinforcing rings, each plugging pile is inserted into a corresponding pressure-bearing steel mesh vent hole 102 to plug the vent hole, each layer of side short sealing plate and each side long sealing plate are fastened outside the pressure-bearing steel mesh wall through binding bands 7, the head end and the tail end of each binding band are respectively provided with binding band fastening holes 14, the head end and the tail end of each binding band are fastened through fixing bolt nuts 13, one layer of side short sealing plates and each side long sealing plate are installed again until the plugging of the mesh body of the pressure-bearing steel mesh is completed, and then the pressure-bearing steel mesh bottom is plugged, and the bottom inner sealing plate 4 and the bottom outer sealing plate 5 are respectively inserted into corresponding sealing plate clamping grooves 107 and are fixed through the sealing plate positioning grooves 109 by bolts.
The box body shell includes sealed lid 8, the casing, set up gas vent 801 on the sealed lid 8, casing upper portion sets up collection gas port 22, casing bottom sets up air inlet 24, the design of air inlet, collection gas port and gas vent, make gas can get into the gas recovery jar in the measurement stage, can realize the quick evacuation of residual gas in the soil after the experiment is accomplished through the air inlet cooperation simultaneously, reduce the action volume of inter-group experiment, experimental efficiency and accuracy have been improved, compare with outdoor excavation experimental pit, experimental box body shell collection gas port and the design of gas vent have realized the recovery of experimental gas, the security and the feature of environmental protection of experiment have been improved. The shell body is a combined box body with an open upper opening, which is formed by assembling a left frame body (namely a box body outer shell 9), a middle frame (namely a box body inner shell 10) and a right frame body (namely a box body outer shell), wherein the upper opening of the combined box body is provided with a ring sealing plate, a ring sealing groove is arranged on the sealing plate 18, and the joint of the left frame body, the middle frame and the right frame body is in sealing connection with a sealing male opening 20 through a sealing female opening 19; the outer wall of the combined box body is provided with a binding band positioning groove 12, and the binding band 7 is clamped into the binding band positioning groove to fasten the left frame body, the middle frame body and the right frame body into a whole; the sealing groove 23 is matched with the sealing cover 8 to realize sealing connection, and the sealing plate is connected with a sealing channel of the pressure-bearing steel mesh to realize top end positioning and sealing. Through the design of the pressure-bearing steel mesh vent holes and the cooperation of the pressure-bearing steel mesh vent holes and all the components, the obstruction effect of the indoor experiment box body shell to the gas diffusion process is reduced, the defect that the experimental gas is difficult to recover in the outdoor experiment pit is overcome, and the accuracy, the safety, the economical efficiency and the environmental protection of the experiment are improved.
The sealed lid is square frame, still sets up handle 802 on the sealed lid 8, and the sealed lower port of lid sets up round closing plate, and the seal groove cooperation of closing plate and shell body realizes the sealed of sealed lid, prevents that experimental gas from getting into the atmosphere.
As shown in fig. 1, the whole preparation stage can be divided into a pressure-bearing steel mesh 1, a side short seal plate 2, a support 3, a bottom inner seal plate 4, a bottom outer seal plate 5, a side long seal plate 6 and a binding belt 7. In the preparation stage, the side short sealing plates 2 and the side long sealing plates 6 are arranged around the pressure-bearing steel mesh 1, the bottom is provided with the bottom inner sealing plate 4 and the bottom outer sealing plate 5, and the sealing plates play a role in sealing the periphery of the box body and the side wall of the bottom in the preparation stage so as to achieve the functions of soil boxing and compaction and prevent soil leakage. The pressure effect to the shrouding in the soil splendid attire in-process adopts the tie-down strap 7 to bind the fastening all around. The support 3 is connected with the pressure-bearing steel net 1 to play a role in supporting and fixing. FIG. 2 is an explosion diagram of a buried gas pipeline leakage diffusion simulation apparatus-a preparation stage-showing the assembly relationship between the individual components. The individual parts are described separately below in order to better demonstrate the structural function of the parts and the assembly relationships between the parts. Fig. 3 is a structural view of the pressure-bearing steel net 1, which is a core component of the present invention, and is provided with a seal channel 101, a vent hole 102, a reinforcing ring 103, a reinforcing belt 104, a reinforcing table 105, a support positioning groove 106, a sealing plate clamping groove 107, a box clamping groove 108 and a sealing plate positioning groove 109. The sealing channel 101 is assembled with the shell of the box body in the measuring stage to achieve good sealing effect; the vent hole 102 plays a role in reducing gas diffusion resistance in a measurement stage, and has a role in improving the accuracy of experimental results compared with the conventional experimental box; the side surface of the pressure-bearing steel net 1 is provided with a plurality of reinforcing rings 103, so that the effect of too much supporting and cracking of the steel net in soil can be prevented, and the strength of the side surface of the pressure-bearing steel net is increased; the reinforcing belts 104 and the reinforcing platforms 105 increase the strength of the bottom of the pressure-bearing steel mesh, and improve the pressure resistance of the steel mesh; the support positioning groove 106 is connected with the support 3 and plays a role in supporting and fixing the pressure-bearing steel mesh; the sealing plate clamping groove 107 is arranged to clamp one end of the bottom inner sealing plate 4 and one end of the bottom outer sealing plate 5 at the bottom into the clamping groove, and the other end of the bottom inner sealing plate and the bottom outer sealing plate play a role in fixation through the sealing plate positioning groove 109; the box clamping groove 108 has the same principle as the sealing plate clamping groove 107, and plays a role in fixing the box shell in the measuring stage. Fig. 4 is a front-back structure diagram of a side long sealing plate 6 and a side short sealing plate 2, wherein both sealing plates are provided with side long sealing plate plugging piles 11 and side short sealing plate plugging piles 11, and the side long sealing plate plugging piles and the side short sealing plate plugging piles play a role in plugging soil leakage in a preparation stage; the side long sealing plate binding band positioning groove 12 and the side short sealing plate binding band positioning groove 12 play a role in positioning the binding band 7 and prevent the binding band from falling off. Fig. 5 is a front-back structure diagram of the bottom inner sealing plate 4 and the bottom outer sealing plate 5, and is similar to the side sealing plates in that plugging piles 11 are arranged to prevent soil leakage at the bottom end in the preparation stage; the bottom inner sealing plate 4 and the bottom outer sealing plate 5 are fixed with the sealing plate clamping groove 107 at one end and fixed with the positioning bolts 16 at the other end through the sealing plate positioning holes 15. Fig. 6 is a structural diagram of the support 6, and the support positioning rod 17 is connected with the pressure-bearing steel mesh 1 through the support positioning groove 106, so as to play a role in fixedly supporting the pressure-bearing steel mesh. Fig. 7 is a structure diagram of the binding belt 7, and is bound on the side long sealing plate binding belt positioning groove 12 and the side short sealing plate binding belt positioning groove 12, so as to fix the side sealing plate. The binding band 7 is provided with binding band fastening holes 14 for fastening the binding band by fixing bolt nuts 13.
After the preparation stage is completed, soil boxing, pipeline burying and detector burying can be performed, after the preparation work is completed, the binding belt 7 is opened, the peripheral side long sealing plates 6, the side short sealing plates 2, the bottom inner sealing plate 4 and the bottom outer sealing plate 5 are removed, the box body shell and the sealing cover are arranged on the pressure-bearing steel mesh, and a measurement experiment is started.
Fig. 8 is an external view of a buried gas pipeline leakage diffusion simulation device-measuring stage, wherein a sealing cover 8 is assembled on a pressure-bearing steel mesh 1 after a sealing plate is removed, and a box body outer shell 9 and a box body inner shell 10 are arranged. FIG. 9 is an explosion diagram of a buried gas line leak diffusion simulator-measurement phase showing the assembly relationship between the components. Fig. 10 is a structural view of the outer shell 9 of the box body, and the structure is provided with a sealing plate 18, a sealing female port 19, a positioning clamping plate 21, a binding belt positioning groove 12, an air collecting port 22 and a sealing groove 23. The sealing plate 18 is connected with the sealing channel 101 of the pressure-bearing steel mesh 1 to realize top end positioning and sealing; the sealing female port 19 is positioned on the side surface of the shell and is positioned and sealed with the sealing male port 20 of the shell on the inner side of the box body; the positioning clamping plate 21 is assembled with the box clamping groove 108 of the pressure-bearing steel mesh 1 to realize bottom positioning and connection; the binding belt positioning groove 12 realizes the fastening function of the box body through the binding belt 7; the gas collection port 22 can meet the requirement of recycling experimental gas; the sealing groove 23 is matched and connected with the sealing cover to play a role in sealing the top end of the experiment box. Fig. 11 is a structural view of the inner shell 10 of the box, which is provided with a sealing plate 18, a binding belt positioning groove 12, a sealing male port 20 of a middle vertical plate, a sealing female port 19, an air inlet 24, a sealing male port 20 of a middle horizontal plate, a positioning clamping plate 21 and a sealing groove 23. The sealing plate 18 is connected with the sealing channel 101 of the pressure-bearing steel mesh 1 to realize top end positioning and sealing; the binding belt positioning groove 12 realizes the fastening function of the box body through the binding belt 7; the sealing male port 20 of the middle vertical plate is positioned on the side surface of the shell and is positioned and sealed with the sealing female port 19 of the shell outside the box body; the structure of the sealing female port 19 of the box body inner shell 10 is the same as that of the sealing female port 19 of the box body outer shell, so that the assembly, the splicing and the sealing of the box body inner shell are realized, and sealing rubber gaskets are arranged in all the sealing female ports and matched with the extrusion action of the sealing male port to realize the sealing; the air inlet 24 is plugged in the measuring stage, and is connected with an air compressor after experimental measurement is finished, so that experimental gas in soil is discharged by matching with the air collecting port 22 of the outer shell of the box body and the exhaust port 801 of the sealing cover; the sealing male port 20 of the middle horizontal plate and the sealing male port 20 of the middle vertical plate have the same structure, so that the assembly and sealing of the inner shell of the box body and the outer shell of the box body are realized; the positioning clamping plate 21 is matched with the box clamping groove 108 to realize the assembly positioning function of the box shell. Fig. 12 is a structural view of the seal cap 8, which is provided with a vent 801, a handle 802, a seal plate 18, and a wiring port 804. The exhaust port 801 acts similarly to the gas collection port 22 of the outer shell of the box body, is connected with the gas recovery tank to recover experimental gas, and is matched with the gas inlet 24 to realize the evacuation of the experimental gas in the soil between the experimental groups, and for repeated experiments which do not need to be disassembled, the experimental gas stored in the soil is reduced by matching with the air blowing in and discharging, so that the experimental error is reduced while the disassembly operation between the groups is reduced; the sealing cover 8 is moved and sealed and pressed by the handle 802; the sealing plate 18 realizes the sealing of a sealing cover through a sealing groove 23 of the outer shell of the box body and a sealing groove 23 of the inner shell of the box body, so that experimental gas is prevented from entering the atmosphere; the wiring port 804 can realize the line connection between the pipeline and the detector after being buried, all the lines are connected with the air supply pipeline through the port, and the sealing mud is adopted for sealing after the line connection.
The invention is divided into two stages during working, wherein the first stage is a preparation stage, and the main working contents are soil boxing of a pressure-bearing steel net, and filling of pipelines and detectors; the second stage is an experimental measurement stage, and the main working content is concentration distribution measurement of gas diffusion in soil. The design of the pressure-bearing steel mesh vent holes reduces the obstruction and accumulation of gas by the side wall of the box body in the experimental process, but the steel mesh is easy to leak out in the soil boxing process to cause incomplete soil filling, so that the bottom surface and the side surface of the pressure-bearing steel mesh are respectively plugged by adopting a bottom surface sealing plate and a side surface sealing plate in the soil filling preparation stage. After the soil is filled in the working preparation stage, the sealing plate is detached, and the shell of the box body is installed for the leakage diffusion measurement experiment in the second stage. In the experimental measurement stage, the pressure-bearing steel mesh greatly reduces the blocking effect of the side wall of the box body of the conventional experimental box on gas, and meanwhile, the box body surrounds the pressure-bearing steel mesh to realize experimental waste gas recovery, so that combustible gas can be prevented from entering the atmosphere, and the environmental pollution is reduced while the experimental precision and safety are ensured. The pressure-bearing steel net is a core component of the device, and ventilation holes on the side surface and the bottom surface are convenient for gas diffusion; the reinforcing rings are arranged around the pressure-bearing steel mesh, and the reinforcing belts and the reinforcing platforms are arranged on the bottom surface of the pressure-bearing steel mesh, so that the positioning and the installation of the device are realized while the strength of the device is ensured. The air inlet and the air collecting port of the box body are matched with the air outlet, residual gas in soil can be rapidly discharged through an air inlet method, and manual operation among experimental groups is reduced so as to improve experimental efficiency. The box body shell is provided with a male port and a female port, the box body shell is spliced and installed, meanwhile, the outer side of the box body shell is provided with a binding belt for pressurizing and sealing, and the air tightness is good.
Aiming at the defects of the existing indoor experiment box for the buried gas pipeline leakage experiment and the existing outdoor experiment pit digging method, the invention greatly reduces the blocking accumulation effect of the box body side wall on gas through the structural design of the pressure-bearing steel mesh vent holes, and aims to improve the accuracy of experimental measurement results; meanwhile, the design of the air inlet, the air collecting opening and the air outlet of the box body shell has the effect of recycling experimental waste gas, so that the gas leakage is prevented from diffusing to enter the atmosphere through soil and a pressure-bearing steel mesh, the experimental risk is reduced, and the environmental pollution is reduced. The invention has simple structure and simple manual operation, and greatly improves the accuracy, safety and environmental protection of the leakage diffusion experiment of the buried gas pipeline.
Claims (2)
1. The utility model provides a buried gas transmission pipeline leakage diffusion analogue means which characterized in that: the buried gas transmission pipeline leakage diffusion simulation device comprises a pressure-bearing steel mesh, a boxing and sealing plate mechanism and a box shell, wherein the pressure-bearing steel mesh is a net-shaped box, an upper opening of the pressure-bearing steel mesh is open, a mesh of the pressure-bearing steel mesh is a vent hole, a sealing channel is arranged at the upper opening of the pressure-bearing steel mesh, a plurality of reinforcing rings are arranged outside a wall of the pressure-bearing steel mesh, a plurality of reinforcing belts are arranged at a bottom of the pressure-bearing steel mesh, reinforcing platforms are also uniformly arranged at the bottom of the pressure-bearing steel mesh, sealing plate clamping grooves, box clamping grooves and sealing plate positioning grooves are formed at the reinforcing platforms, and a support is arranged at each reinforcing platform; in the experiment preparation stage, a boxing and sealing plate mechanism is detachably arranged outside the pressure-bearing steel mesh to form a box body with an open upper opening, and soil boxing, pipeline landfill and detector landfill are carried out; after the experiment preparation stage is completed, the box loading sealing plate mechanism is detached from the outside of the pressure-bearing steel mesh, and in the experiment measurement stage, the box shell is detachably surrounded outside the pressure-bearing steel mesh after filling to form a closed experiment box, and concentration distribution measurement in soil after gas leakage is carried out; the box body shell comprises a sealing cover and a shell body, wherein the sealing cover is provided with an exhaust port, the upper part of the shell body is provided with a gas collecting port, and the bottom of the shell body is provided with a gas inlet;
the boxing and sealing plate mechanism comprises a plurality of side short sealing plates, a plurality of side long sealing plates, two bottom inner sealing plates, two bottom outer sealing plates and a plurality of binding bands; the inner sides of each side short sealing plate and each side long sealing plate are uniformly provided with plugging piles, the outer sides of the side short sealing plates and the side long sealing plates are provided with binding band positioning grooves, each side short sealing plate and each side long sealing plate are inserted between two adjacent reinforcing rings, each plugging pile is inserted into a corresponding pressure-bearing steel mesh vent hole to plug the vent hole, each layer of side short sealing plate and each side long sealing plate are fastened outside the pressure-bearing steel mesh wall through binding bands, and the head ends and the tail ends of the binding bands are fastened through fixing bolts and nuts; the bottom inner sealing plate and the bottom outer sealing plate are respectively inserted into corresponding sealing plate clamping grooves and are fixed by bolts through sealing plate positioning grooves;
the shell body is a combined box body with an open upper opening, which is formed by assembling a left frame body, a middle frame and a right frame body together, the upper opening of the combined box body is provided with a sealing plate, a circle of sealing groove is arranged on the sealing plate, and the joint of the left frame body, the middle frame and the right frame body is in sealing connection with the sealing male opening through a sealing female opening; the outer wall of the combined box body is provided with a binding band positioning groove, and the binding band is clamped into the binding band positioning groove to fasten the left frame body, the middle frame body and the right frame body into a whole; the sealing groove is matched with the sealing cover to realize sealing connection, and the sealing plate is connected with the sealing channel of the pressure-bearing steel mesh to realize top end positioning and sealing.
2. The buried gas line leakage diffusion simulation apparatus according to claim 1, wherein: the sealing cover is a square frame, the handle is further arranged on the sealing cover, a circle of sealing plate is arranged at the lower port of the sealing cover, and the sealing plate is matched with the sealing groove of the shell body to realize the sealing of the sealing cover.
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