Experimental device for explosion venting and quenching method in explosion gallery of comprehensive pipe gallery gas cabin

Abstract

The invention belongs to the technical field of urban public safety, and relates to an experimental device for an explosion venting and quenching method in an explosion gallery of a comprehensive pipe gallery gas cabin, and the explosion venting and quenching method in the explosion gallery of the comprehensive pipe gallery gas cabin is characterized in that an explosion venting interlayer plate is arranged at the top of the comprehensive pipe gallery gas cabin; the comprehensive pipe gallery gas cabin is divided into a comprehensive pipe gallery gas cabin main body and an in-gallery explosion venting interlayer, and a plurality of explosion venting openings distributed in the axial direction of the explosion venting interlayer plate are formed in the explosion venting interlayer plate so as to communicate the comprehensive pipe gallery gas cabin main body with the in-gallery explosion venting interlayer, so that explosion energy generated by gas explosion is guided into the in-gallery explosion venting interlayer from the comprehensive pipe gallery gas cabin main body; the experiment device comprises an experiment cabin used for simulating a comprehensive pipe gallery gas cabin, an explosion venting interlayer plate is arranged at the top of the experiment cabin, and a plurality of explosion venting openings distributed in the axial direction of the explosion venting interlayer plate are formed in the explosion venting interlayer plate so as to communicate an experiment cabin main body with an in-gallery explosion venting interlayer. The comprehensive pipe gallery gas cabin is divided into a comprehensive pipe gallery gas cabin main body and an in-gallery explosion venting interlayer through simulation.

Description

Technical Field

[0001] The present invention belongs to the technical field of urban public safety and relates to an experimental device for an explosion venting and quenching method in a gas chamber of an integrated pipe gallery. Background Art

[0002] Modern urban underground integrated pipe galleries are located in densely populated areas with a large scale, a large amount of gas, wide distribution, and a wide range of aspects. Once a gas explosion occurs in an integrated pipe gallery, it will cause varying degrees of casualties and property losses. For existing, under-construction, and planned large-scale urban underground integrated pipe galleries, there is currently no unified gas explosion isolation, suppression, and venting measures. Only a small part of the explosion suppression technologies applied in other fields are studied for gas explosions in urban underground integrated pipe galleries, and more are focused on emergency disposal such as gas leakage alarm and ventilation. Obviously, only carrying out emergency disposal from these aspects is far from enough.

[0003] At present, the research on gas explosions in urban underground integrated pipe galleries mainly focuses on explosion shock protection and mechanical effects of the integrated pipe gallery. There is little technical research on gas explosion isolation, suppression, and venting in urban underground integrated pipe galleries, mainly involving three aspects: inert gas explosion suppression technology, anti-explosion technology of porous material walls, and venting of rainwater storage tanks.

[0004] A. Inert Gas Explosion Suppression

[0005] Mainly, inert gas is injected into the integrated pipe gallery, and through the combined physical and chemical effects of dilution, cooling, and chain breaking, the gas explosion flame is suppressed. Currently, the mainstream inert gas explosion suppressants are N2, CO2, C3HF7, etc., and it has been proven that CO2 has a better explosion suppression effect than N2, and C3HF7 has a better suppression effect on methane explosion than CO2. Injection pressure, inert gas concentration, inerting area, etc. are the main factors affecting inert gas explosion suppression. At the same time, since C3HF7 is one of the halon substitutes, more and more scholars have begun to pay attention to C3HF7 in fields other than traditional fire extinguishing, such as studying the flame suppression mechanism and characteristics in the case of strong turbulent explosion flames.

[0006] B. Porous Material Explosion Suppression

[0007] Mainly, by installing porous materials with a certain porosity on the side walls of the urban underground integrated pipe gallery, and then studying the mechanical effects of pipe gallery explosions under different explosion intensities and working conditions, from the perspective of explosion structure protection, provide a basis for ensuring impact damage of the urban underground integrated pipe gallery.

[0008] Or place the porous material horizontally across the cross-section of the integrated pipe gallery, or replace the existing fire doors at 200m intervals with porous materials for explosion isolation and suppression related attempts and research. Relevant research shows that when the porosity of the porous structure is relatively large, its inhibitory mechanism for explosion propagation plays a dominant role and can effectively inhibit the propagation of the explosion.

[0009] C. Explosion venting of rainwater storage tank

[0010] Related research teams have proposed an explosion venting integrated pipe gallery that uses a rainwater storage tank for explosion venting. Based on simulation studies, it has been found that when the water level in the rainwater tank is low, the explosion shock wave will enter the rainwater tank from the lower openings of the gas tank and the rainwater tank and spread into the outside world, causing great damage to the outside. When the water level in the rainwater tank is moderate, after the explosion shock wave contacts the water surface, part of the energy will be converted into the potential energy of the water, thereby reducing the intensity of the explosion shock wave; when the explosion shock wave first passes through a section of air rich in water vapor, it can effectively reduce the maximum overpressure peak value and delay the arrival of the overpressure peak value. In the presence of water, it can bear a large explosion shock wave. Compared with the anhydrous state, water can greatly reduce the damage of the explosion shock wave to the pipe gallery structure.

[0011] However, the above three existing research technologies have the following deficiencies respectively:

[0012] A. Inert gas explosion suppression

[0013] Existing explosion suppression technologies for urban underground integrated pipe galleries all require the prior injection of inert gas, which is equivalent to filling a certain concentration of inert gas in the gallery before the explosion occurs. Although it has a certain explosion suppression effect, if the gas leaks and the monitoring and alarm system fails or is not timely, the opportunity to inject inert gas in advance before the explosion will be lost, and then the explosion suppression failure phenomenon will occur.

[0014] Moreover, the pressure reduction and fire control effects of the inert gas explosion suppression technology are average. For the entire explosion pipe gallery section, the overpressure peak value and the reduction of the flame speed usually do not exceed 50%, and the flame range will not be significantly reduced. Only the flame extinction time will be appropriately shortened. Therefore, it can be judged that this technology has a certain explosion suppression effect and protection for gas explosions in urban underground integrated pipe galleries, but the effect is limited, and other better technologies need to be further studied.

[0015] B. Explosion suppression with porous materials

[0016] In terms of explosion resistance with porous materials attached to the wall, mainly a porous material with a certain porosity is installed on the wall of the pipe gallery for explosion shock protection of the gallery wall. This technology can indeed have a certain protective effect on the wall of the pipe gallery. However, from the perspective of explosion suppression, for the overpressure and flame action range of gas explosions, it is very weak or almost ineffective.

[0017] There are two explosion-suppression technologies: installing large-area porous materials in the corridor and replacing the existing fire doors every 200m with large-area, high-porosity porous materials. Although it has a certain explosion-suppression ability in terms of explosion-suppression effect, there are still several defects: first, if the porous materials are installed randomly in the corridor, it is inconvenient for pedestrians and daily inspections; second, if the installation distance is too far, or there is only one porous material fire door every 200m, the gas explosion will fully develop due to the long distance, and there is a possibility of explosion escalation and explosion suppression failure; third, if the installation distance is too long, although the explosion can be controlled within a section of the corridor through the reasonable selection of porous materials, for the explosion section corridor, the overpressure will not be significantly attenuated, the flame range will not be reduced, and the hardware facilities and equipment such as the building structure and pipelines inside the corridor, as well as the possible temporary personnel, will also suffer great damage and destruction, and the ideal disaster reduction effect cannot be achieved.

[0018] C. Explosion relief in rainwater storage tank

[0019] This technology is mainly effective for situations where the gas tank and the rainwater storage tank are adjacent to each other. However, since the explosion is vented in the corridor, most of the pressure and flames after the explosion are on the upper side, rather than spreading more to the water layer on the lower side, so the attenuation of the explosion impact in the corridor is limited and the effect is poor. In addition, if there is no water in the rainwater storage tank, this design pattern will cause damage to both the gas tank and the rainwater storage tank; when there is too much water in the rainwater tank, it is equivalent to reducing the area and volume of the gas tank in disguise, and the possibility of venting the explosion to the right water storage tank is reduced, which will accelerate the spread of the gas explosion flame, and the losses and harm caused may be greater. At the same time, in many real integrated pipe corridors, the gas tank, power tank and rainwater storage tank are not set adjacent to each other, so this explosion venting technology has engineering implementation difficulties. Summary of the invention

[0020] In view of this, the purpose of the present invention is to provide an experimental device for the explosion relief and quenching method in the gas chamber explosion gallery of an integrated pipeline corridor, so as to facilitate the experiment of the explosion relief and quenching method in the gas chamber explosion gallery of the integrated pipeline corridor, thereby providing theoretical support for the promotion and application of the explosion relief and quenching method, so as to solve the problems of limited overpressure attenuation amplitude, inadequate control of flame action range, and still great mechanical impact damage to surrounding building structures and pipelines in the existing urban underground integrated pipeline corridor gas explosion response technology, thereby achieving better fire control, fire suppression and pressure attenuation after a gas explosion in the urban underground integrated pipeline corridor.

[0021] In order to achieve the above object, the present invention provides the following technical solutions:

[0022] An experimental device for the method of explosion venting and quenching in the explosion gallery of a utility tunnel gas chamber. The method of explosion venting and quenching in the explosion gallery of a utility tunnel gas chamber divides the utility tunnel gas chamber into a main body of the utility tunnel gas chamber and an in-gallery explosion venting interlayer by setting an explosion venting partition plate on the top of the utility tunnel gas chamber. A number of explosion venting openings are provided on the explosion venting partition plate along its axial direction to connect the main body of the utility tunnel gas chamber and the in-gallery explosion venting interlayer, so as to conduct the explosion energy generated by the gas explosion from the main body of the utility tunnel gas chamber into the in-gallery explosion venting interlayer;

[0023] The experimental device includes an experimental chamber for simulating the utility tunnel gas chamber, and an explosion venting partition plate is provided on the top of the experimental chamber to divide the experimental chamber into a main body of the experimental chamber and an in-gallery explosion venting interlayer. A number of explosion venting openings are provided on the explosion venting partition plate along its axial direction to connect the main body of the experimental chamber and the in-gallery explosion venting interlayer, so as to simulate dividing the utility tunnel gas chamber into a main body of the utility tunnel gas chamber and an in-gallery explosion venting interlayer;

[0024] The main body of the experimental chamber is evenly divided into a number of chambers from left to right along its length direction, and each chamber corresponds to an explosion venting opening. An ignition controller is provided at the left end of the leftmost chamber, and an air compressor and a methane gas cylinder are connected through an intake pipeline to fill the chamber with gas. The end of the chamber and its corresponding explosion venting opening are sealed with an explosion venting film to simulate local leakage;

[0025] High-speed cameras are provided on both the left side of the leftmost chamber and the right side of the rightmost chamber, and pressure sensors are provided in each chamber and the explosion venting interlayer.

[0026] Further, porous materials are provided at the explosion venting openings.

[0027] Further, the porous materials are made of metal, and their specifications are 20 ppi to 30 ppi.

[0028] Further, an intake valve is provided on the intake pipeline, and a flow meter is provided on the intake pipeline connecting the methane gas cylinder to detect the methane flow rate.

[0029] Further, an exhaust pipeline is provided at the bottom of the chamber where the intake pipeline is provided, and an exhaust valve is provided on the exhaust pipeline.

[0030] Further, a hydrogen gas cylinder is also connected to the intake pipeline to simulate the explosion of hydrogen-doped natural gas in the utility tunnel gas chamber.

[0031] Further, an inert gas nozzle is provided at the position corresponding to the explosion venting opening in the leftmost chamber to simulate the collaborative explosion venting and quenching of inert gas and the in-gallery explosion venting interlayer.

[0032] Further, a fine water mist nozzle is provided at a position corresponding to the explosion vent in the leftmost compartment to simulate the cooperative explosion vent quenching of the fine water mist and the explosion vent sandwich in the corridor.

[0033] Further, the ignition controller, the high-speed camera, and the pressure sensor are all electrically connected to a control platform arranged outside the experimental chamber.

[0034] Further, the control platform is a computer.

[0035] The beneficial effects of the present invention are as follows:

[0036] An experimental device for a method of explosion vent quenching in a gas chamber of an integrated pipe gallery is provided by the present invention, which is convenient for conducting experiments on the method of explosion vent quenching in a gas chamber of an integrated pipe gallery, so as to provide theoretical support for the popularization and application of this explosion vent quenching method. It solves the problems existing in the existing gas explosion response technologies for urban underground integrated pipe galleries, such as limited overpressure attenuation amplitude, ineffective control of the flame action range, and still large mechanical impact damage to surrounding building structures and pipelines. The method of explosion vent quenching in a gas chamber of an integrated pipe gallery can quickly transfer the explosion energy generated by the explosion of natural gas / hydrogen-enriched natural gas from the main body of the pipe gallery to the explosion vent sandwich, achieving the maximum protection of the hardware, facilities, and personnel in the main body of the pipe gallery, and further realizing better fire control, fire suppression, and pressure attenuation after a gas explosion occurs in an urban underground integrated pipe gallery.

[0037] Other advantages, objectives, and features of the present invention will be elaborated to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail and preferably in conjunction with the accompanying drawings, where:

[0039] Figure 1 is a perspective view of an integrated pipe gallery gas chamber with an explosion vent sandwich in the corridor in the present invention;

[0040] Figure 2 is Figure 1 a cross-sectional view of;

[0041] Figure 3 is a structural schematic diagram of an explosion vent partition board in the present invention;

[0042] Figure 4 is a schematic diagram of an experimental device for explosion vent quenching in an integrated pipe gallery natural gas explosion in the corridor (explosion vent sandwich);

[0043] Figure 5 Schematic diagram of the explosion venting and quenching experimental device for natural gas explosion in the utility tunnel (explosion venting interlayer + porous material);

[0044] Figure 6 Schematic diagram of the explosion venting and quenching experimental device for hydrogen - doped natural gas explosion in the utility tunnel (explosion venting interlayer);

[0045] Figure 7 Schematic diagram of the explosion venting and quenching experimental device for hydrogen - doped natural gas explosion in the utility tunnel (explosion venting interlayer + porous material);

[0046] Figure 8 Schematic diagram of the explosion venting and quenching experimental device for hydrogen - doped natural gas explosion in the utility tunnel (explosion venting interlayer + porous material + inert gas);

[0047] Figure 9 Schematic diagram of the explosion venting and quenching experimental device for hydrogen - doped natural gas explosion in the utility tunnel (explosion venting interlayer + porous material + fine water mist). Detailed implementation manners

[0048] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0049] Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and cannot be understood as a limitation to the present invention; for better illustrating the embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well - known structures and their descriptions in the attached drawings may be omitted.

[0050] The same or similar reference numerals in the attached drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the attached drawings are only for illustrative purposes and cannot be understood as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms can be understood according to specific circumstances.

[0051] Please refer to Figures 1 to 3 Figures 1 to 3 , which is a method for quenching internal explosion venting in a gas chamber of an integrated utility tunnel. This method divides the gas chamber of the integrated utility tunnel into a main body of the gas chamber of the integrated utility tunnel and an internal explosion venting interlayer in the tunnel by setting an explosion venting partition plate on the top of the gas chamber of the integrated utility tunnel. The explosion venting partition plate is provided with a number of explosion venting openings distributed along its axial direction to connect the main body of the gas chamber of the integrated utility tunnel and the internal explosion venting interlayer in the tunnel, and a porous material is provided at the explosion venting opening (the porous material is a material composed of a network structure of interconnected or closed pores, and the boundaries or surfaces of the pores are composed of struts or flat plates).

[0052] Specially note that for Figure 2 the explosion venting partition plate in

[0053] 1) For the existing gas chamber structure of an urban underground integrated utility tunnel that has been built, the functions of the present invention can be realized by transforming it: a relatively simple, low-cost and easy-to-implement method is to select a specified interlayer space height (i.e., the height of the internal explosion venting interlayer in the tunnel), then select high-strength stainless steel plates, and design the openings of the stainless steel plates according to the number, position and area size of the designed explosion venting openings, and then install the stainless steel explosion venting partition plate with explosion venting openings at the specified height on the inner upper part of the gas chamber of the integrated utility tunnel and fix it in place.

[0054] 2) For the gas chambers of urban underground integrated utility tunnels under construction and to be built, there are two methods to conveniently realize the functions of the present invention. One is to apply the method of the above-mentioned existing integrated utility tunnel, select stainless steel plates as the explosion venting partition plate and design the openings; the other is to directly pour the internal explosion venting partition in the tunnel made of reinforced concrete according to the design specifications of the internal explosion venting interlayer and the explosion venting openings in the tunnel, so as to directly divide the gas chamber of the integrated utility tunnel into the main body of the gas chamber of the integrated utility tunnel and the internal explosion venting interlayer in the tunnel.

[0055] Whichever method is used, it has good mechanical tolerance and will not significantly increase the construction cost of the existing urban underground integrated utility tunnel, and has good engineering implementation prospects.

[0056] In the prior art, before the internal explosion venting interlayer located above it is loaded in the gas chamber of the integrated utility tunnel, although there is an explosion venting channel connecting to the outside at the upper part of the end of the gas chamber of the integrated utility tunnel, if a gas explosion occurs in the gas chamber of the integrated utility tunnel, the explosion energy will cause undifferentiated impact on the entire internal structure members, pipelines, personnel, etc. in the tunnel; however, after the internal explosion venting interlayer is loaded by the present invention, the explosion energy can quickly change to the internal explosion venting interlayer in the tunnel, which can greatly reduce the explosion power of the main body of the gas chamber of the integrated utility tunnel, especially can significantly attenuate the impact damage to the lower part of the main body of the gas chamber of the integrated utility tunnel.

[0057] It should be noted that in the present invention, an explosion venting channel communicating with the outside world is still retained, and this explosion venting channel is located at the top of the end of the in-corridor explosion venting interlayer, that is, the position where the explosion venting channel is located in the prior art. That is, the method for quenching and suppressing explosion in the gas chamber of the utility tunnel in the present invention will not interfere with the structures outside the gas chamber of the utility tunnel, which is more convenient for structural improvement of the existing urban underground utility tunnels that have been built.

[0058] Preferably, a number of fine water mist nozzles are provided in the main body of the gas chamber of the utility tunnel and distributed along its axial direction to quench and suppress the explosion through fine water mist when a gas explosion occurs; a number of inert gas nozzles are provided in the main body of the gas chamber of the utility tunnel and distributed along its axial direction to quench and suppress the explosion through inert gas when a gas explosion occurs.

[0059] On the basis of having an in-corridor explosion venting interlayer, fine water mist nozzles and inert gas nozzles are added to the main body of the gas chamber of the utility tunnel, forming a collaborative explosion venting and quenching method of in-corridor explosion venting and fine water mist quenching and suppressing explosion or inert gas quenching and suppressing explosion, so as to quickly minimize the impact of gas explosion on the utility tunnel.

[0060] Please refer to Figures 4 to 9 , which is an experimental device designed for the method of in-corridor explosion venting and quenching of gas explosion in the gas chamber of the utility tunnel in the present invention; since the urban underground utility tunnel project is constructed in stages, this scheme plans to adopt the same length for the utility tunnel and the same distance and specifications for the explosion venting openings, that is, the opening positions and sizes of the explosion venting openings of each section of the chamber are the same, and the gas chambers completed in each stage of construction are marked accordingly, such as chamber 1 / 2 / 3. Figure 4 and Figure 5 are the experimental device diagrams of in-corridor explosion venting of natural gas explosion in the utility tunnel with and without porous materials, Figure 6 and Figure 7 are the experimental device diagrams of in-corridor explosion venting of hydrogen-enriched natural gas explosion with and without porous materials, Figure 8 and Figure 9 are the experimental device diagrams of collaborative in-corridor explosion venting of the utility tunnel with inert gas / fine water mist under porous materials to simulate the scenario when the top explosion venting interlayer of a local explosion in the gas chamber of various urban underground utility tunnels is loaded.

[0061] Example 1

[0062] As Figure 4As shown in the figure, it is an experimental device for internal explosion venting and quenching of natural gas in an integrated pipe gallery, and there is no porous material at the venting opening. Since the main component of natural gas is methane, the explosion power of pure methane is weaker than that of hydrogen-doped methane (i.e., hydrogen-doped natural gas). Therefore, for the internal explosion venting mode in the urban underground integrated pipe gallery in this case, it can be relatively simple, the distance between venting openings can be appropriately increased, and the area of venting openings can be appropriately reduced. The experimental device includes an experimental chamber, and a venting partition plate is arranged on the top of the experimental chamber to divide the experimental chamber into an experimental chamber main body and an internal explosion venting interlayer in the gallery. And a number of venting openings distributed along its axial direction are provided on the venting partition plate to communicate the experimental chamber main body and the internal explosion venting interlayer in the gallery, so as to simulate dividing the gas chamber in the integrated pipe gallery into the gas chamber main body in the integrated pipe gallery and the internal explosion venting interlayer in the gallery.

[0063] Among them, the size of the experimental chamber is 100mm×10mm×3000mm, the height of the internal explosion venting interlayer in the gallery is set to 4 cm, and the experimental chamber main body is evenly divided into three chambers from left to right to form chambers 1 / 2 / 3. A venting opening is arranged on the venting partition plate at the top of each chamber, and the distance between each venting opening is 1000 mm. The distance from the first venting opening to the leftmost end of chamber 1 is 400 mm or 800 mm, and the size of the venting opening is 80mm×80mm;

[0064] A point fire source (ignition controller) is arranged at the left end of chamber 1, and an air compressor and a methane gas cylinder are connected to chamber 1 through an intake pipeline at the left end of chamber 1 to fill chamber 1 with gas, and the end of chamber 1 and the corresponding venting opening are blocked with a venting film to simulate local leakage; an intake valve is arranged on the intake pipeline, and a flowmeter is arranged on the intake pipeline connecting the methane gas cylinder to detect the methane flow rate; an exhaust pipeline is arranged at the bottom of chamber 1, and an exhaust valve is arranged on the exhaust pipeline to facilitate timely exhausting of the remaining gas in the experimental chamber after the experiment is completed.

[0065] High-speed cameras are arranged at the left end of chamber 1 and the right end of chamber 3 to capture images of the change in the propagation structure of the explosion flame and detect images of the flame front speed, and a pressure sensor is arranged in each chamber and the venting interlayer to detect the explosion overpressure.

[0066] Among them, the ignition controller, high-speed camera, and pressure sensor are all connected to a control platform arranged outside the experimental chamber, and the control platform is a computer.

[0067] Example 2

[0068] As Figure 5 shown, the difference between this example and Example 1 is that, on the basis of Example 1, a porous material with quenching function is added at the venting opening to simulate the situation where a porous material with quenching function is installed at the venting opening.

[0069] The porosity of the porous material is selected in the range of 20 PPI - 30 PPI, which should not be too large or too small. If it is too large, it will be too dense and not conducive to energy venting. If it is too small, the quenching function of the explosion flame cannot be achieved. The material of the porous material is selected as a metal material, such as copper, iron, iron-nickel, etc. Of course, porous materials of other materials can also be used, such as foam ceramics, etc.

[0070] Example 3

[0071] As Figure 6 shown, the difference between this example and Example 1 is that, on the basis of Example 1, an air compressor, a methane gas cylinder, and a hydrogen gas cylinder are connected to the left end of the chamber 1 through an intake pipeline to fill the chamber 1 with hydrogen-enriched natural gas.

[0072] After natural gas is hydrogenated, its explosion power increases significantly compared with the case of pure natural gas (pure methane). Therefore, in order to ensure the normal operation of this experimental device, it is necessary to appropriately adjust the vent distance and vent size in this example, increase the vent area, and thus reduce the vent distance to ensure efficient venting in the corridor.

[0073] Example 4

[0074] As Figure 7 shown, the difference between this example and Example 3 is that, on the basis of Example 3, a porous material with a quenching function is added at the vent to simulate the situation where a porous material with a quenching function is installed at the vent.

[0075] The porosity of the porous material is selected in the range of 20 PPI - 30 PPI, which should not be too large or too small. If it is too large, it will be too dense and not conducive to energy venting. If it is too small, the quenching function of the explosion flame cannot be achieved.

[0076] Example 5

[0077] As Figure 8 shown, the difference between this example and Example 3 is that, on the basis of Example 3, an inert gas nozzle is provided at the position corresponding to the vent in the chamber 1, so as to realize the synergistic effect of the vent in the corridor, the porous material, and the inert gas at the moment of gas explosion, and further improve the safety and efficient venting effect of gas explosion in the urban underground utility tunnel.

[0078] Example 6

[0079] As Figure 9As shown in the figure, the difference between this embodiment and Embodiment 3 is that, on the basis of Embodiment 3, this embodiment is provided with fine water mist nozzles at positions corresponding to the explosion vent in the cabin 1, so as to realize the synergistic effect of the explosion vent, porous material, and fine water mist in the corridor at the moment of gas explosion, and further improve the safety and efficient explosion venting effect of the gas explosion in the urban underground utility tunnel in the corridor.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An experimental device for the explosion-induced internal venting and quenching method in the gas compartment of an integrated utility tunnel, characterized in that: The method for quenching explosion and relieving pressure in the explosion relief layer inside the gas compartment of the utility tunnel divides the gas compartment of the utility tunnel into the main body of the gas compartment of the utility tunnel and the explosion relief interlayer inside the tunnel by setting an explosion relief partition board on the top of the gas compartment of the utility tunnel. A number of explosion relief openings are provided on the explosion relief partition board along its axial direction to connect the main body of the gas compartment of the utility tunnel and the explosion relief interlayer inside the tunnel, so as to introduce the explosion energy generated by the gas explosion from the main body of the gas compartment of the utility tunnel into the explosion relief interlayer inside the tunnel. The experimental device includes an experimental chamber for simulating the gas compartment of the utility tunnel, and an explosion relief partition board is arranged on the top of the experimental chamber to divide the experimental chamber into the main body of the experimental chamber and the explosion relief interlayer inside the tunnel. A number of explosion relief openings are provided on the explosion relief partition board along its axial direction to connect the main body of the experimental chamber and the explosion relief interlayer inside the tunnel, so as to simulate dividing the gas compartment of the utility tunnel into the main body of the gas compartment of the utility tunnel and the explosion relief interlayer inside the tunnel. The main body of the experimental chamber is evenly divided into several chambers from left to right along its length direction, and each chamber corresponds to an explosion relief opening. An ignition controller is arranged at the left end of the leftmost chamber, and an air compressor and a methane gas cylinder are connected through an intake pipeline to fill the chamber with gas. The end of the chamber and its corresponding explosion relief opening are blocked with an explosion relief film to simulate local leakage. High-speed cameras are arranged on the left side of the leftmost chamber and on the right side of the rightmost chamber, and pressure sensors are arranged in each chamber and the explosion relief interlayer.

2. The experimental device for the explosion-induced internal venting and quenching method in the gas chamber of the utility tunnel according to claim 1, characterized in that: Porous materials are provided at the explosion relief openings.

3. The method for explosion venting and quenching of gas in the gas chamber of the utility tunnel according to claim 2, characterized in that: The porous materials are made of metal, and their specifications are 20 ppi - 30 ppi.

4. The experimental device for the explosion-induced internal venting and quenching method in the gas chamber of the utility tunnel according to claim 1, characterized in that: An intake valve is provided on the intake pipeline, and a flowmeter is provided on the intake pipeline connecting the methane gas cylinder to detect the methane flow rate.

5. The experimental device for the explosion-induced internal venting and quenching method in the gas chamber of an integrated utility tunnel according to claim 1, characterized in that: An exhaust pipeline is provided at the bottom of the chamber with the intake pipeline, and an exhaust valve is provided on the exhaust pipeline.

6. The experimental device for the method of explosion venting and quenching in the gas compartment of an integrated utility tunnel according to claim 1, characterized in that: A hydrogen gas cylinder is also connected to the intake pipeline to simulate the explosion of hydrogen-doped natural gas in the gas compartment of the utility tunnel.

7. The experimental device for the explosion-induced internal venting and quenching method in the gas chamber of the utility tunnel according to claim 1, characterized in that: An inert gas nozzle is provided at the position corresponding to the explosion relief opening in the leftmost chamber to simulate the collaborative explosion relief and quenching of inert gas and the explosion relief interlayer inside the tunnel.

8. The experimental device for the explosion-induced venting and quenching method in the gas chamber of the utility tunnel according to claim 1, characterized in that: A fine water mist nozzle is provided at the position corresponding to the explosion relief opening in the leftmost chamber to simulate the collaborative explosion relief and quenching of fine water mist and the explosion relief interlayer inside the tunnel.

9. The experimental device for the explosion-induced internal venting and quenching method in the gas chamber of the utility tunnel according to claim 1, characterized in that: The ignition controller, high-speed cameras, and pressure sensors are all electrically connected to a control platform arranged outside the experimental chamber.

10. The experimental device for the explosion internal relief quenching method in the gas compartment of the utility tunnel according to claim 9, characterized in that: The control platform is a computer.

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