CN110410682B - Comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table under ventilation state - Google Patents
Comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table under ventilation state Download PDFInfo
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- CN110410682B CN110410682B CN201910705788.9A CN201910705788A CN110410682B CN 110410682 B CN110410682 B CN 110410682B CN 201910705788 A CN201910705788 A CN 201910705788A CN 110410682 B CN110410682 B CN 110410682B
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- 238000009423 ventilation Methods 0.000 title claims abstract description 85
- 238000004088 simulation Methods 0.000 title claims abstract description 46
- 238000009792 diffusion process Methods 0.000 title claims abstract description 39
- 238000005070 sampling Methods 0.000 claims abstract description 72
- 229910052754 neon Inorganic materials 0.000 claims description 38
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 38
- 239000011229 interlayer Substances 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 174
- 238000002474 experimental method Methods 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000000779 smoke Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 238000012952 Resampling Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
Abstract
The utility model relates to a comprehensive pipe gallery gas pipeline leakage diffusion simulation experiment table in a ventilation state, which comprises a pipe gallery model pipe, wherein a gas pipeline is arranged in the pipe gallery model pipe, a plurality of leakage points are arranged on the gas pipeline, and the gas pipeline is communicated with a gas supply structure; the top of the pipe gallery model pipe is communicated with a ventilation structure capable of adjusting ventilation working conditions and ventilation times; a plurality of gas sampling devices capable of collecting gas in the pipe gallery model pipe are arranged on the side wall of the pipe gallery model pipe at intervals; the gas sampling device and the gas supply structure are electrically connected with a control part. The utility model can simulate the leakage condition of the gas pipeline in the comprehensive pipe rack under different ventilation times, can automatically sample the leaked gas through the gas sampling device, provides reliable parameters for the leakage diffusion and emergency response fields of the gas pipeline in the comprehensive pipe rack under the ventilation state, effectively improves the operation and maintenance efficiency of the comprehensive pipe rack, and reduces the safety accident rate of the comprehensive pipe rack.
Description
Technical Field
The utility model relates to the technical field of urban underground comprehensive pipe galleries, in particular to a comprehensive pipe gallery gas pipeline leakage diffusion simulation experiment table in a ventilation state.
Background
Gas pipelines are important pipelines in utility tunnel, and may be subject to leakage hazards during long-term use. In order to deal with the occurrence of leakage, timely and effective early warning is carried out, and experimental tests are required to be carried out on parameters such as a gas alarm concentration set value (upper limit value), an emergency cut-off concentration set value, a gas detector arrangement distance, ventilation times in a pipe gallery and the like, so that the effectiveness and economy of the gas detector arrangement distance are determined, and the gas detector arrangement distance and the ventilation times in the pipe gallery are correspondingly adjusted. Because the gas leakage experiment is difficult to be carried out in the field, a simulation experiment table needs to be set up aiming at the field of leakage diffusion and emergency response of the gas pipeline of the comprehensive pipe rack in the ventilation state.
The first prior art is: the utility model patent CN105894936A discloses a small-size simulation experiment table for underground coal mine external fire, which comprises a roadway and a matched measurement and control system, and can simulate the condition of the roadway when the fire occurs and monitor the concentration of smoke components and components, the smoke flow law, the temperature field change law, the toxic and harmful gas concentration change law and the heat loss of fuel combustion, thereby developing a proper coal mine roadway detection control system. However, the following problems exist in the prior art: (1) In the prior art, the working condition of a roadway when a fire disaster occurs is mainly simulated, the concentration, the smoke flow rule, the temperature field change rule and the like of each smoke component and each component in the roadway are monitored, the roadway belongs to a relatively closed space, the utility tunnel is used as a novel underground structure, and a pair of air supply and exhaust wells are arranged in a natural gas cabin at a certain interval, so that the roadway belongs to a non-fully closed space; (2) In the prior art, the discharge of smoke is mainly considered, so that only one fan is arranged at one end of a roadway to perform mechanical exhaust, simulation under a ventilation working condition cannot be performed, and reliability of simulation data cannot be guaranteed to guide an actual comprehensive pipe gallery to determine reasonable and reliable ventilation times; (3) In the prior art, smoke generated by burning the adhesive tape (or a cable, an electric appliance and the like) simulates the flowing state of the smoke, and the smoke has negative influence on environmental protection.
And the second prior art is as follows: the utility model patent CN108281078A discloses a simulation experiment table for pipe leakage diffusion, comprising: a pipe gallery model pipe with an air inlet and outlet well, a leakage hole and a gas sampling device; a gas inlet well communicated with a carbon dioxide gas cylinder is arranged at the upper part of one end of the pipe gallery model pipe; arranging an exhaust well at the tail end of the pipe gallery model pipe, and exhausting carbon dioxide gas in the pipe gallery model pipe to the outdoor atmosphere; a leakage hole is formed in the bottom surface of the middle of the pipe gallery model pipe, a leakage point needle is inserted into the leakage hole, and the leakage point needle is connected with a nitrogen cylinder through an air pipe and an electromagnetic valve; the side of the pipe gallery model pipe is provided with a plurality of gas sampling holes, and the gas sampling device is fixed on the front longitudinal beam of the pipe gallery model pipe through screws and inserted into the gas sampling holes to sample gas at the gas sampling holes. The simulation experiment table provided by the second prior art can simulate the leakage condition of the pipeline in the underground comprehensive pipe gallery model pipeline, and the leaked gas can be automatically sampled by the gas sampling device. However, the following problems exist in the second prior art: (1) The simulation experiment table in the second prior art does not consider different ventilation conditions in the pipe gallery, and can only simulate static non-ventilation working conditions in the pipe gallery; (2) The simulation experiment table in the second prior art adopts the leakage of nitrogen in the pipe gallery model pipe filled with carbon dioxide so as to simulate the leakage condition of the gas pipeline of the utility tunnel. Because the pipe gallery model pipe in the second prior art needs to be filled with carbon dioxide, the operation process is more complicated. In addition, the nitrogen content in the air is higher, and the nitrogen in the air outside the simulation experiment table can be doped during sampling or testing in the second prior art, so that the nitrogen content in the experiment result is higher; (3) Compared with the actual underground comprehensive pipe gallery gas cabin, the simulation experiment table in the second prior art lacks an air inlet interlayer, an air exhaust interlayer and a fireproof door; (4) The simulation experiment table in the second prior art adopts the mode that leakage gas flows out through the needle to simulate the leakage condition of the pipeline, and can not simulate the leakage of gas from the pipeline well.
The third prior art is: the utility model patent CN200952977 discloses an automatic gas sampler, which can be provided with a plurality of sampling channels according to the requirement. The automatic gas sampler comprises a base, a set of sampling device, a set of positioning device, a set of actuating mechanism, a set of supporting device, a set of control device and a power supply. When the device starts to collect gas, the control device automatically controls the action of the guide disc and the guide arm to respectively move the sample disc and the needle head seat to the designated positions, so that the needle head seat and the injection head are aligned with the sample bottle and sample. After the gas sampling time is up, the control device automatically withdraws the needle, pulls the injection head out of the sample bottle, returns the bottle, closes the air paths of the electromagnetic valve, the inflating pump, the gas sampling pump and other devices, and completes the whole sampling process. However, the third prior art has the following problems: (1) The automatic gas sampler in the third prior art is mainly used for collecting samples from a plurality of sample bottles placed on a sample tray, and cannot directly extract gas on site; (2) The automatic gas sampler in the third prior art can meet the requirement of multi-channel sampling, but cannot realize synchronous sampling of a plurality of positions and cannot meet the gas collection requirement of a comprehensive pipe rack gas leakage experiment; (3) The structure, the control circuit and the like of the automatic gas sampler device in the third prior art are complex, and the actual manufacturing difficulty is high.
The prior art is four: the utility model patent CN108458904a discloses a gas sampling system. The system comprises: the device comprises a direct-current power supply, an electromagnetic relay, a data acquisition card, a controller and a gas acquisition device; the controller is in circuit connection with the data acquisition card, and controls the starting and stopping of the data acquisition card by sending a control command to the data acquisition card; the data acquisition card is connected with the electromagnetic relay circuit to control the switch and the commutation of the electromagnetic relay; the electromagnetic relay controls the electrifying and the power-off of the electromagnetic cylinder; the gas collection device controls the auxiliary pushing rod to push and pull through the power on and off of the electromagnetic cylinder, and the auxiliary pushing rod pushes the injector to conduct gas sampling operation. The utility model can sample gas at a plurality of positions at the same time. However, in the fourth prior art, only an independent gas sampling system is provided, no experiment table is matched with the system, and the gas sampling system provided in the fourth prior art adopts an electric control mode, is not suitable for being used in an environment where flammable and explosive gas is adopted for experiments or dust is more, has low explosion-proof performance, and cannot meet the requirements of special experimental conditions.
Therefore, the inventor provides a comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table under a ventilation state by virtue of experience and practice of relevant industries for many years so as to overcome the defects of the prior art.
Disclosure of Invention
The utility model aims to provide a comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table in a ventilation state, which overcomes the defects of the prior art, can simulate the leakage condition of the comprehensive pipe rack internal combustion gas pipeline in different ventilation times, can automatically sample the leaked gas through a gas sampling device, provides reliable parameters for the comprehensive pipe rack gas pipeline leakage diffusion and emergency response fields in the ventilation state, effectively improves the comprehensive pipe rack operation and maintenance efficiency, and reduces the comprehensive pipe rack safety accident occurrence rate.
The utility model aims to realize the comprehensive pipe gallery gas pipeline leakage diffusion simulation experiment table in a ventilation state, which comprises a pipe gallery model pipe with sealed end parts, wherein a gas pipeline is arranged in the pipe gallery model pipe, at least one leakage point is arranged on the gas pipeline, and the gas pipeline is communicated with a gas supply structure; the top of the pipe gallery model pipe is communicated with a ventilation structure capable of adjusting ventilation working conditions and ventilation times; a plurality of gas sampling devices capable of collecting gas in the pipe gallery model pipe are arranged on the side wall of the pipe gallery model pipe; the gas sampling device and the gas supply structure are electrically connected with a control part.
In a preferred embodiment of the present utility model, the gas supply structure can supply neon gas into the gas pipeline, and the neon gas can leak into the pipe gallery model pipe through the leakage point, so as to simulate the leakage condition of the gas pipeline in the real pipe gallery.
In a preferred embodiment of the utility model, fireproof gaskets can be arranged in the transverse direction in the pipe gallery model pipe, and the fireproof gaskets are used for sealing the inner cavity of the pipe gallery model pipe so as to simulate the closing state of a fireproof door in a real pipe gallery.
In a preferred embodiment of the present utility model, the ventilation structure includes an air inlet portion and an air exhaust portion that are disposed at intervals, the air inlet portion includes an air inlet that is disposed through a first end of a top portion of the pipe rack model pipe, an air inlet interlayer is covered on the air inlet, and an air inlet well is disposed on the air inlet interlayer; the exhaust part comprises an exhaust outlet which is communicated with the second end of the top of the pipe gallery model pipe, an exhaust interlayer is covered on the exhaust outlet, and an exhaust well is arranged on the exhaust interlayer.
In a preferred embodiment of the present utility model, an exhaust fan is disposed at the exhaust port; an air inlet fan is arranged at the air inlet.
In a preferred embodiment of the present utility model, the gas sampling apparatus includes an injector capable of extracting collected gas from the pipe gallery model pipe, the injector includes a syringe, a first end of the syringe is provided with an injection needle in a communicating manner, and a second end of the syringe is provided with a piston core rod in a sliding and sealing manner; and the piston core rod is connected with a sampling push-pull driving structure.
In a preferred embodiment of the present utility model, the sampling push-pull driving structure includes a cylinder, a first end of the cylinder is penetrated by a boost rod, and a second end of the cylinder is arranged in a closed manner; the boosting rod is fixedly connected with the piston core rod; the electromagnetic cylinder is communicated with the air cylinder and is used for driving the boosting rod to slide, the electromagnetic cylinder is provided with an air inlet hole and an air outlet hole, and the electromagnetic cylinder is electrically connected with the control part.
In a preferred embodiment of the present utility model, the gas sampling apparatus further includes a base, a first end of the base is provided with an injector support, the syringe fixing frame is provided on the injector support, a second end of the base is provided with an electromagnetic cylinder fixing support, and the electromagnetic cylinder is fixed on the electromagnetic cylinder fixing support.
In a preferred embodiment of the present utility model, the gas supply structure includes a neon bottle, an outlet of the neon bottle is provided with a pressure reducing valve, and the pressure reducing valve is communicated with the gas pipeline through a hose; the electromagnetic valve for controlling the on-off of the hose is connected in series with the hose, and the electromagnetic valve is electrically connected with the control part.
In a preferred embodiment of the utility model, a gas pressure and velocity tester is arranged on the pipe gallery model pipe;
the pipe gallery model is arranged on the support in a supporting mode, and the fixing frames of the gas sampling devices are arranged on the support.
Therefore, the comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table in the ventilation state has the following beneficial effects:
according to the comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table in the ventilation state, the ventilation structure can adjust ventilation working conditions and ventilation times, experimental simulation under different ventilation times can be realized, and the flowing and distribution rule of leaked gas in the comprehensive pipe rack is obtained; different wind speeds in the pipe gallery model pipe can be set by adjusting the rotating speed of the air inlet fan or the air outlet fan, so that different ventilation times in the real comprehensive pipe gallery can be simulated;
the semi-automatic control gas sampling devices can realize the automatic collection of multiple azimuth and synchronous gases in the pipe gallery model pipe; the gas sampling device has high explosion-proof performance and good reliability, and is beneficial to safe and stable sampling process in experiments;
according to the utility model, the neon is adopted to simulate gas leakage, the density ratio of the neon to the air is similar to that of the gas to the air, the diffusion characteristics of the neon are also similar, the neon has the characteristics of non-combustion, non-combustion supporting and inactivity, the gas leakage and diffusion experiment can be safely realized in a laboratory, meanwhile, the content of the neon in the air is less, the error caused by the less content of the neon in the air is less, and the experimental result is more accurate;
the pipe gallery model pipe is designed in a sectional mode so as to be convenient to install and connect, and the pipe gallery model pipe is arranged closer to the integral structure of the gas cabin in the real comprehensive pipe gallery, so that the simulation reality is high; the arrangement of the fireproof gaskets in the pipe gallery model pipe can simulate different working conditions of closing or opening of the fireproof door in the comprehensive pipe gallery gas cabin;
the utility model has simple structure, strong economy, semiautomatic control and convenient operation, provides reliable parameters for the fields of leakage and diffusion of the gas pipeline and emergency response of the comprehensive pipe gallery in a ventilation state, such as a gas alarm concentration set value (upper limit value), an emergency cut-off concentration set value, a gas detector arrangement distance and ventilation times in the pipe gallery, effectively improves the operation and maintenance efficiency of the comprehensive pipe gallery and reduces the safety accident rate of the comprehensive pipe gallery; through the simulation of utility tunnel gas pipeline leakage under ventilation state, can pass many times experiments in the laboratory safely, discover its distribution rule, provide reliable parameter to the design of corresponding leakage gas detection device, and the determination of the reasonable ventilation number of times in the piping lane.
Drawings
The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein:
fig. 1: the utility model discloses a schematic diagram of a comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table in a ventilation state.
Fig. 2: the structure of the exhaust part is schematically shown in the utility model.
Fig. 3: a schematic diagram of a gas sampling apparatus of the present utility model.
In the figure:
100. the utility tunnel gas pipeline leakage diffusion simulation experiment table in a ventilation state;
1. a neon cylinder; 2. a pressure reducing valve; 3. an electromagnetic valve; 4. a hose; 5. a gas pipeline; 6. a standby pipeline; 7. a front side member; 8. a vertical beam; 9. a right angle connector; 10. a cross beam; 11. a baffle; 12. supporting the longitudinal beam; 13. a rear side member; 14. an air inlet well; 15. an air inlet interlayer; 16. an air inlet; 17. a gas pressure and velocity tester; 18. a piping lane model pipe; 19. an exhaust fan; 20. a ventilation well; 21. an exhaust interlayer; 22. a gas sampling device; 23. a gas sampling hole; 24. a conduit bracket; 25. fireproof gaskets; 26. a fixing nut; 27. a leakage point; 28. a syringe; 29. a syringe holder; 30. a fixed sleeve; 31. a push-assisting rod; 32. a cylinder; 33. an electromagnetic cylinder; 34. an electromagnetic cylinder fixing bracket; 35. a plastic cover; 36. a base; 37. an air inlet hole; 38. and an air outlet hole.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.
The specific embodiments of the utility model described herein are for purposes of illustration only and are not to be construed as limiting the utility model in any way. Given the teachings of the present utility model, one of ordinary skill in the related art will contemplate any possible modification based on the present utility model, and such should be considered to be within the scope of the present utility model. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, 2 and 3, the utility model provides a comprehensive pipe gallery gas pipeline leakage diffusion simulation experiment table 100 in a ventilation state, which comprises a pipe gallery model pipe 18 with sealed ends, wherein a gas pipeline 5 is arranged in the pipe gallery model pipe 18, a plurality of leakage points 27 are arranged on the gas pipeline 5, the gas pipeline 5 is communicated with a gas supply structure, and in the embodiment, the gas supply structure can be used for introducing neon into the gas pipeline, and the neon can be leaked into the pipe gallery model pipe through the leakage points for simulating the leakage condition of the gas pipeline in a real pipe gallery. Neon has the characteristics of non-combustion, non-combustion supporting and non-activity, and the neon is used for carrying out gas simulation, so that the safety is higher, in the embodiment, the standby pipeline 6 is arranged in the pipe gallery model pipe 18 at intervals parallel to the gas pipeline 5, and a plurality of pipeline brackets 24 are arranged in the pipe gallery model pipe 18 at intervals along the longitudinal direction in order to realize stable support of the gas pipeline 5 and the standby pipeline 6; the top of the pipe gallery model pipe 18 is communicated with a ventilation structure capable of adjusting ventilation working conditions and ventilation times; a plurality of gas sampling devices 22 capable of collecting gas in the pipe gallery model pipe are arranged on the side wall of the pipe gallery model pipe 18 at intervals; the gas sampling apparatus 22 and the gas supply structure are electrically connected to a control section.
According to the comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table in the ventilation state, the ventilation structure can adjust ventilation working conditions and ventilation times, experimental simulation under different ventilation times can be realized, and the flowing and distribution rule of leaked gas in the comprehensive pipe rack is obtained; the plurality of gas sampling devices can realize automatic collection of a plurality of azimuth gases in the pipe gallery model pipe; according to the utility model, the neon is adopted to simulate gas leakage, the density ratio of the neon to the air is similar to that of the gas to the air, the diffusion characteristics of the neon are also similar, the neon has the characteristics of non-combustion, non-combustion supporting and inactivity, the gas leakage and diffusion experiment can be safely realized in a laboratory, meanwhile, the content of the neon in the air is less, the error caused by the less content of the neon in the air is less, and the experimental result is more accurate; the utility model has simple structure, strong economy, semiautomatic control and convenient operation, provides reliable parameters for the fields of leakage and diffusion of the gas pipeline and emergency response of the comprehensive pipe gallery in a ventilation state, such as a gas alarm concentration set value (upper limit value), an emergency cut-off concentration set value, a gas detector arrangement distance and ventilation times in the pipe gallery, effectively improves the operation and maintenance efficiency of the comprehensive pipe gallery and reduces the safety accident rate of the comprehensive pipe gallery; through the simulation of utility tunnel gas pipeline leakage under ventilation state, can pass many times experiments in the laboratory safely, discover its distribution rule, provide reliable parameter to the design of corresponding leakage gas detection device, and the determination of the reasonable ventilation number of times in the piping lane.
Further, as shown in fig. 1, fireproof gaskets 25 can be disposed in the transverse direction in the piping lane model pipe 18, and the fireproof gaskets 25 are used for sealing the inner cavity of the piping lane model pipe 18 so as to simulate the closed state of the fireproof door in the real piping lane. The arrangement of the fireproof gaskets 25 in the pipe rack model pipe 18 can simulate different working conditions of closing or opening the fireproof door in the utility tunnel gas cabin.
Further, as shown in fig. 1 and 2, the ventilation structure comprises an air inlet part and an air exhaust part which are arranged at intervals, the air inlet part comprises an air inlet 16 which is arranged at the first end of the top of the pipe gallery model pipe in a penetrating way, an air inlet interlayer 15 is covered on the air inlet 16, an air inlet well 14 is arranged on the air inlet interlayer, and the sizes of the air inlet well 14 and the air inlet interlayer 15 are arranged in a certain proportion with the sizes of a real air inlet well and a real air inlet interlayer; the exhaust part comprises an exhaust port which is communicated with the second end of the top of the pipe gallery model pipe, an exhaust interlayer 21 is covered on the exhaust port, an exhaust well 20 is arranged on the exhaust interlayer 21, and the sizes of the exhaust well 20 and the exhaust interlayer 21 are set in a certain proportion with the sizes of the real exhaust well and the real exhaust interlayer.
Further, as shown in fig. 1 and 2, an exhaust fan 19 may be disposed at the exhaust port, and when the exhaust fan 19 is turned on, the air in the pipe gallery model pipe 18 is extracted, so that the air is exhausted through the exhaust interlayer 21 and the exhaust well 20, and the ventilation state in the real comprehensive pipe gallery is simulated. An air intake fan may also be provided at the air inlet 16. The opening and closing of the exhaust fan 19 and the air intake fan are controlled by a control part. The exhaust fan 19 is started, so that mechanical exhaust can be realized; the air inlet fan is started, so that mechanical air inlet can be realized. By controlling the opening and closing states of the air inlet fan and the air exhaust fan 19, three ventilation working conditions of the real comprehensive pipe rack can be simulated, wherein the first ventilation working condition is natural air inlet and mechanical air exhaust (natural air inlet at the air inlet and mechanical air exhaust is realized by opening the air exhaust fan 19), the second ventilation working condition is mechanical air inlet and natural air exhaust (mechanical air inlet is realized by opening the air inlet fan and mechanical air inlet is realized by opening the air exhaust fan, and mechanical air exhaust working condition is mechanical air inlet and mechanical air exhaust (mechanical air inlet is realized by opening the air inlet fan and mechanical air exhaust is realized by opening the air exhaust fan 19). By adjusting the rotational speed of the air intake fan and/or the air exhaust fan 19, different wind speeds in the pipe gallery model pipe can be set, and different ventilation times in the real comprehensive pipe gallery can be simulated.
Further, as shown in fig. 3, the gas sampling apparatus 22 includes an injector 28 capable of extracting collected gas from the pipe gallery model pipe 18, the injector 28 includes a syringe, a first end of the syringe is communicated with an injection needle, and a second end of the syringe is sealed inwards and slides through a piston rod; the piston core rod is connected with a sampling push-pull driving structure.
As shown in fig. 1, in the present embodiment, a plurality of gas sampling holes 23 are provided on the side wall of the piping lane model pipe 18, a gas sampling device 22 is provided at each gas sampling hole 23, and the injection needle of the gas sampling device 22 is inserted into the gas sampling hole 23 in a sealing manner to sample the gas at the gas sampling hole, and at the same time, the problem of environmental pollution caused by gas leakage is avoided. In one embodiment of the present utility model, 6 gas sampling holes 23 and 6 gas sampling apparatuses 22 are provided on one side wall of the piping lane model pipe 18, and the positions and the number of the gas sampling holes 23 and the gas sampling apparatuses 22 may be changed as required in the actual laboratory. The gas sampling device 22 has high explosion-proof performance and good reliability, and is beneficial to safe and stable sampling process in experiments.
Further, as shown in fig. 3, the sampling push-pull driving structure includes a cylinder 32, a first end of the cylinder 32 is penetrated by a boost rod 31, and a second end of the cylinder 32 is arranged in a closed manner; the auxiliary push rod 31 is fixedly connected with the piston core rod; the air cylinder 32 is communicated with an electromagnetic cylinder 33 for driving the push rod 31 to slide, the electromagnetic cylinder 33 is provided with an air inlet hole 37 and an air outlet hole 38, and the electromagnetic cylinder 33 is electrically connected with the control part. In this embodiment, a first end of the booster rod 31 is sleeved with a fixing sleeve 30, and the fixing sleeve 30 is made of plastic; one end of the fixed sleeve 30 is provided with a clamping groove, the piston core rod is provided with an outer convex clamping plate, and the outer convex clamping plate is clamped in the clamping groove. The cylinder 32 is connected to an electromagnetic cylinder 33 to form an actuating mechanism. The air sampling device 22 is pneumatically controlled, and the electromagnetic cylinder 33 controls the opening and closing of the air inlet hole 37 and the air outlet hole 38, so as to control the piston inside the air cylinder 32 and the boosting rod 31 to perform sampling and emptying actions.
Further, as shown in fig. 3, the gas sampling apparatus 22 further includes a base 36, a first end of the base 36 is provided with the injector support 29, the syringe fixing frame is provided on the injector support 29, a second end of the base 36 is provided with the electromagnetic cylinder fixing support 34, and the electromagnetic cylinder 33 is fixed on the electromagnetic cylinder fixing support 34. The bottom of the electromagnetic cylinder fixing bracket 34 is fixed on the base 36 through a screw, the electromagnetic cylinder 33 is positioned above the electromagnetic cylinder fixing bracket 34, and the electromagnetic cylinder 33 is connected with the electromagnetic cylinder fixing bracket 34 through a screw. The syringe support 29 is also fixed to the base 36 by screws, and the syringe support 29 supports the syringe 28 and its position can be flexibly adjusted according to the size of the syringe 28. In the present embodiment, the base 36 is made of rectangular pipe, and the plastic cover 35 is fastened to the end of the base to close the two ends.
Further, as shown in fig. 1, the gas supply structure includes a neon bottle 1, an outlet of the neon bottle 1 is provided with a pressure reducing valve 2, and the pressure reducing valve 2 is communicated with a gas pipeline 5 through a hose 4; the hose 4 is connected in series with a solenoid valve 3 for controlling the on-off of the hose, and the solenoid valve 3 is electrically connected with the control part. In the experimental process, after the pressure reducing valve 2 is opened, neon continuously flows into the gas pipeline 5 through the hose 4, then is leaked through the leakage point 27 on the gas pipeline 5, the occurrence of the leakage condition of the gas pipeline in the real comprehensive pipe gallery is simulated, and the switch of the electromagnetic valve 3 can be controlled through the control part, so that the leakage process of the neon is regulated.
Further, as shown in fig. 1, a gas pressure and velocity tester 17 is provided to the piping lane model pipe, and the gas pressure and velocity inside the piping lane model pipe 18 are measured, respectively.
Further, as shown in FIG. 1, the tube gallery model tube 18 is fabricated from plexiglass, which is rectangular in cross section and has the same aspect ratio as the real utility tunnel. The main body of the pipe gallery model pipe 18 is designed in a sectional mode so as to be convenient to install and connect, the connecting parts are connected by adopting the fixing nuts 26, so that the comprehensive pipe gallery tunnel with any length can be simulated, fig. 1 only shows two-section pipe gallery model pipes 18, two ends of each pipe gallery model pipe 18 are provided with baffle plates 11 in a sealing mode, and the baffle plates 11 and the pipe gallery model pipes 18 are fixed by the fixing nuts 26. The arrangement of the pipe gallery model pipe 18 is closer to the integral structure of the gas cabin in the real comprehensive pipe gallery, and the simulation reality is high.
Further, as shown in fig. 1, the piping lane model pipe 18 is mounted on a bracket, and each gas sampling apparatus 22 is fixed to the bracket. In this embodiment, the rack includes side racks disposed in parallel at both ends, the side racks at both ends are respectively composed of 2 vertical beams 8 and 1 cross beam 10, the tops of the side racks at both ends are connected by a front longitudinal beam 7 and a rear longitudinal beam 13, the lower parts of the side racks at both ends are connected by 2 supporting longitudinal beams 12, a pipe gallery model pipe 18 is supported on the 2 supporting longitudinal beams 12, and each gas sampling device 22 is fixedly supported on the front longitudinal beam 7. The side brackets, the front side members 7, the rear side members 13 and the support side members 12 constitute brackets of an integral frame structure. The vertical beams 8, the cross beams 10, the front longitudinal beams 7, the rear longitudinal beams 13 and the supporting longitudinal beams 12 are all made of standard aluminum alloy sections, and all the aluminum alloy sections are connected through standard right-angle connectors 9 and fixed through screws. The base 36 of each gas sampling apparatus 22 is fixed to the front side member 7 by the right angle connector 9.
When a simulation experiment is performed, the pressure reducing valve 2 of the neon bottle 1 is manually started, then a control signal is transmitted to the electromagnetic valve 3 through the control part (computer software), the electromagnetic valve 3 is started, neon flows into the gas pipeline 5 through the hose 4, then leakage points 27 on the gas pipeline 5 leak into the pipe gallery model pipe 18, the air inlet motor and the air exhaust fan 19 are controlled, and the leakage diffusion process of the gas pipeline in the comprehensive pipe gallery in a ventilation state is simulated.
The control part controls the electromagnetic cylinder 33 to open the air inlet hole 37 and close the air outlet hole 38, and air enters the air cylinder 32 from the air inlet hole 37, so that the booster rod 31 moves forwards, the plunger rod of the injector 28 is pushed to the bottom, and the air in the injector 28 is exhausted. When gas collection is started, the control part controls the air inlet hole 37 of the electromagnetic cylinder 33 to be closed, the air outlet hole 38 is opened, and gas is discharged out of the air cylinder 32 from the air outlet hole 38, so that the booster rod 31 moves into the air cylinder 32, the piston core rod of the injector 28 is pulled, a gas sample enters the injector 28, and the sampling operation of the gas in the real comprehensive pipe gallery is completed.
After sampling, the syringe 28 at each position is manually removed, the gas sample is inspected, and a new syringe 28 is replaced for the next sampling. During resampling, the rotating speed of the air inlet fan and/or the air outlet fan 19 can be adjusted, different wind speeds in the pipe gallery model pipe can be set, and different ventilation times in the real comprehensive pipe gallery can be simulated.
After the experiment is finished, the pressure reducing valve 2 is manually closed, the exhaust fan 19 is started, and the mixed gas in the pipe gallery model pipe 18 is exhausted.
After neon leakage, under different ventilation times, neon concentration distribution in the pipe gallery model pipe 18 can be detected through tests, so that a gas diffusion rule after leakage of an air pipeline in the comprehensive pipe gallery can be further explored, corresponding emergency measures are designed, and the method has important application value in improving the operation and maintenance safety of the comprehensive pipe gallery.
Therefore, the comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table in the ventilation state has the following beneficial effects:
according to the comprehensive pipe rack gas pipeline leakage diffusion simulation experiment table in the ventilation state, the ventilation structure can adjust ventilation working conditions and ventilation times, experimental simulation under different ventilation times can be realized, and the flowing and distribution rule of leaked gas in the comprehensive pipe rack is obtained; different wind speeds in the pipe gallery model pipe can be set by adjusting the rotating speed of the air inlet fan or the air outlet fan, so that different ventilation times in the real comprehensive pipe gallery can be simulated;
the semi-automatic control gas sampling devices can realize the automatic collection of multiple azimuth and synchronous gases in the pipe gallery model pipe; the gas sampling device has high explosion-proof performance and good reliability, and is beneficial to safe and stable sampling process in experiments;
according to the utility model, the neon is adopted to simulate gas leakage, the density ratio of the neon to the air is similar to that of the gas to the air, the diffusion characteristics of the neon are also similar, the neon has the characteristics of non-combustion, non-combustion supporting and inactivity, the gas leakage and diffusion experiment can be safely realized in a laboratory, meanwhile, the content of the neon in the air is less, the error caused by the less content of the neon in the air is less, and the experimental result is more accurate;
the pipe gallery model pipe is designed in a sectional mode so as to be convenient to install and connect, and the pipe gallery model pipe is arranged closer to the integral structure of the gas cabin in the real comprehensive pipe gallery, so that the simulation reality is high; the arrangement of the fireproof gaskets in the pipe gallery model pipe can simulate different working conditions of closing or opening of the fireproof door in the comprehensive pipe gallery gas cabin;
the utility model has simple structure, strong economy, semiautomatic control and convenient operation, provides reliable parameters for the fields of leakage and diffusion of the gas pipeline and emergency response of the comprehensive pipe gallery in a ventilation state, such as a gas alarm concentration set value (upper limit value), an emergency cut-off concentration set value, a gas detector arrangement distance and ventilation times in the pipe gallery, effectively improves the operation and maintenance efficiency of the comprehensive pipe gallery and reduces the safety accident rate of the comprehensive pipe gallery; through the simulation of utility tunnel gas pipeline leakage under ventilation state, can pass many times experiments in the laboratory safely, discover its distribution rule, provide reliable parameter to the design of corresponding leakage gas detection device, and the determination of the reasonable ventilation number of times in the piping lane.
The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this utility model, and are intended to be within the scope of this utility model.
Claims (9)
1. The utility model discloses a utility tunnel gas pipeline leakage diffusion simulation experiment table under ventilation state, which is characterized by comprising a pipe gallery model pipe with sealed end parts, wherein a gas pipeline is arranged in the pipe gallery model pipe, at least one leakage point is arranged on the gas pipeline, and the gas pipeline is communicated with a gas supply structure; the top of the pipe gallery model pipe is communicated with a ventilation structure capable of adjusting ventilation working conditions and ventilation times; a plurality of gas sampling devices capable of collecting gas in the pipe gallery model pipe are arranged on the side wall of the pipe gallery model pipe; the gas sampling device and the gas supply structure are electrically connected with a control part;
the gas supply structure can be used for introducing neon into the gas pipeline, and the neon can leak into the pipe gallery model pipe through the leakage point and is used for simulating the leakage condition of the gas pipeline in the real pipe gallery.
2. The utility tunnel gas pipeline leakage diffusion simulation experiment table under the ventilation state of claim 1, wherein fireproof gaskets are arranged in the tunnel model pipe along the transverse direction, and the fireproof gaskets are used for sealing an inner cavity of the tunnel model pipe so as to simulate the closed state of a fireproof door in a real tunnel.
3. The utility model pipe rack gas pipeline leakage diffusion simulation experiment table in a ventilation state according to claim 1, wherein the ventilation structure comprises an air inlet part and an air exhaust part which are arranged at intervals, the air inlet part comprises an air inlet which is arranged at the first end of the top of the pipe rack model pipe in a penetrating way, an air inlet interlayer is covered on the air inlet, and an air inlet well is arranged on the air inlet interlayer; the exhaust part comprises an exhaust outlet which is communicated with the second end of the top of the pipe gallery model pipe, an exhaust interlayer is covered on the exhaust outlet, and an exhaust well is arranged on the exhaust interlayer.
4. The utility tunnel gas pipeline leakage diffusion simulation experiment table in a ventilation state as claimed in claim 3, wherein an exhaust fan is arranged at the exhaust port; an air inlet fan is arranged at the air inlet.
5. The ventilation utility tunnel gas pipeline leakage diffusion simulation experiment table according to any one of claims 1 to 4, wherein the gas sampling device comprises an injector capable of extracting collected gas from the tunnel model pipe, the injector comprises a needle cylinder, a first end of the needle cylinder is communicated with an injection needle, and a second end of the needle cylinder is internally sealed and slides through a piston core rod; and the piston core rod is connected with a sampling push-pull driving structure.
6. The simulation experiment table for leakage and diffusion of the gas pipeline of the utility tunnel in the ventilation state according to claim 5, wherein the sampling push-pull driving structure comprises a cylinder, a boosting rod is penetrated at a first end of the cylinder, and a second end of the cylinder is arranged in a closed manner; the boosting rod is fixedly connected with the piston core rod; the electromagnetic cylinder is communicated with the air cylinder and is used for driving the boosting rod to slide, the electromagnetic cylinder is provided with an air inlet hole and an air outlet hole, and the electromagnetic cylinder is electrically connected with the control part.
7. The utility model tunnel gas pipeline leakage diffusion simulation experiment table in a ventilation state according to claim 6, wherein the gas sampling device further comprises a base, a first end of the base is provided with an injector support, the needle cylinder is fixed on the injector support, a second end of the base is provided with an electromagnetic cylinder fixing support, and the electromagnetic cylinder is fixed on the electromagnetic cylinder fixing support.
8. The utility tunnel gas pipe leakage diffusion simulation experiment table in a ventilation state according to claim 1, wherein the gas supply structure comprises a neon bottle, an outlet of which is provided with a pressure reducing valve, and the pressure reducing valve is communicated with the gas pipe through a hose; the electromagnetic valve for controlling the on-off of the hose is connected in series with the hose, and the electromagnetic valve is electrically connected with the control part.
9. The utility tunnel gas pipeline leakage diffusion simulation experiment table in a ventilation state according to claim 1, wherein a gas pressure and speed tester is arranged on the tunnel model pipe;
the pipe gallery model is arranged on the support in a supporting mode, and the fixing frames of the gas sampling devices are arranged on the support.
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| CN110967146B (en) * | 2019-12-24 | 2021-10-01 | 合肥智慧龙机械设计有限公司 | Special inflator for pipeline leakage diffusion experiment |
| CN111122067B (en) * | 2020-01-06 | 2022-02-25 | 深圳市燃气集团股份有限公司 | Gas pipeline gas leakage simulation device |
| CN114383054A (en) * | 2021-01-27 | 2022-04-22 | 福州大学 | Pipe gallery gas pipeline leakage experiment system and method |
| CN114458829A (en) * | 2022-04-13 | 2022-05-10 | 中国电建集团山东电力建设第一工程有限公司 | Method for assembling and installing comprehensive pipe frame and cable bridge in place for high-end equipment |
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