CN220154430U - Experimental device for propagation of premixed gas flame in pipeline - Google Patents

Experimental device for propagation of premixed gas flame in pipeline Download PDF

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Publication number
CN220154430U
CN220154430U CN202320479693.1U CN202320479693U CN220154430U CN 220154430 U CN220154430 U CN 220154430U CN 202320479693 U CN202320479693 U CN 202320479693U CN 220154430 U CN220154430 U CN 220154430U
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pipeline
connecting piece
ignition
premixed gas
pipeline connecting
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CN202320479693.1U
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王海鹏
张子龙
李斌
张丹
王永旭
解立峰
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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Abstract

The utility model provides an experimental device for propagation of premixed gas flame in a pipeline, which can measure flame pressure by using a pressure sensor, shoot flame propagation images by using high-speed schlieren and study propagation rules of the premixed gas flame in the pipeline. The device comprises a device placing frame, a device protecting cover, an air inlet and air mixing system, a vacuumizing system, a pipeline connecting piece, a pressure monitoring system, a low-energy pulse ignition device and a high-speed schlieren system. The protective cover and the device placement frame can be freely disassembled and assembled. The protection cover uses acrylic plates, and the front plate and the rear plate can be opened and closed at a large angle. And 7 sliding grooves are fixed on the device placing frame, one end of the pulley bracket is fixed in the sliding grooves, and the other end is fixed at the bottoms of the pipeline connecting piece and the air outlet pipeline connecting piece and used for supporting the pipeline. The experimental pipeline and the ignition pipeline are composed of quartz glass tubes, so that the flame propagation condition can be conveniently observed. The experimental pipeline comprises bent pipes with different types and different bending angles, and experimental researches under different working conditions can be carried out.

Description

Experimental device for propagation of premixed gas flame in pipeline
Technical Field
The utility model relates to the field of flammable gas flame propagation, in particular to a premixed gas flame propagation experimental device in a pipeline.
Background
Combustible gases are currently used in a wide range of industrial and everyday life applications, such as natural gas, hydrogen, and the like. However, when the combustible gas leaks during storage and transportation, combustion and explosion are extremely easy to occur, and serious life and property losses are caused. In which the propagation of premixed gas flames in a duct is quite common, it is necessary to develop studies on the propagation of premixed gas flames in a duct.
In recent years, researchers have studied the propagation of various premixed gas flames in different pipelines and have invented a number of experimental devices with different functions. Patent CN202120440864.0 discloses an experimental device for researching the propagation speed of premixed combustible gas explosion flame, which can be fit to the relationship between the propagation speed of premixed combustible gas explosion flame and the length of a pipeline; patent CN201310435470.6 discloses a device for testing flame propagation and inhibition in the process of explosion of premixed gas of combustible gas and air, which can be used for researching flame propagation characteristics and rules in the process of explosion of premixed gas under the influence of factors such as different combustible gas components, different ignition positions, different opening states, different flame instability and the like. However, both devices lack measurement of pressure in flame propagation and are relatively fixed, and only experimental studies under the same type of experimental pipeline can be performed.
Disclosure of Invention
The utility model aims to provide a simple, convenient and detachable experimental device for propagation of premixed gas flame in a pipeline.
The technical scheme for realizing the aim of the utility model is as follows:
a propagation experimental device of premixed gas flame in a pipeline comprises an outer frame formed by connecting a protective cover and a device placing frame, wherein a chute is arranged in the frame;
setting an experimental pipeline to be connected with the three sections of ignition pipelines, wherein the ignition pipelines are connected through a pipeline connecting piece I or a pipeline connecting piece I, and the experimental pipeline is connected with a vacuumizing system;
the pressure monitoring system is connected to the first pipeline connecting piece, the tail end of the ignition pipeline is connected with the gas mixing and air inlet system through the gas outlet pipeline connecting piece, and the ignition head of the low-energy pulse ignition device is connected to the gas outlet pipeline connecting piece; the pulley bracket is connected with an opening at the bottom of the ignition pipeline and used for supporting the ignition pipeline, and the high-speed schlieren system is arranged at two sides of the ignition pipeline;
the protective cover comprises a rear acrylic plate and a front acrylic plate and is used for performing large-angle switching;
one end of the pulley bracket is fixed in the chute, and the other end is provided with threads and is used for being fixed in the bottom openings of the first pipeline connecting piece and the air outlet pipeline connecting piece.
The ignition of the device is carried out by the low-energy pulse ignition device, and the ignition head is arranged at the top of the air outlet pipeline connecting piece.
The top openings of the first and second pipe connectors are different. In general, the pipelines are connected through the first pipeline connecting piece, the pressure sensor is fixed at the top, and when the ignition position needs to be changed, the first pipeline connecting piece at a certain position can be replaced by the second pipeline connecting piece to connect the pipelines, and meanwhile, the fire head is fixed at the top, so that the ignition position is changed.
The pulley is installed at the bottom of the device placing frame, so that the device can be moved conveniently.
The utility model has the following advantages:
1. the materials used in the utility model are basically common materials, and the cost is low; simple structure, easy operation, convenient regulation and removal.
2. The utility model is provided with the protective cover, so that the damage caused by accidents in experiments can be effectively reduced, and the safety performance is high.
3. The device adopts a modularized design, and by using the device, ignition pipelines and experimental pipelines with different types, different lengths and different compositions can be replaced, so that experimental researches under different working conditions can be carried out; the device can freely adjust the composition of the inlet gas, and can develop and research the premixed flame propagation characteristics of different types of experimental gases.
Drawings
Fig. 1 is an overall front view of the device.
Fig. 2 is a side view of the outer frame of fig. 1.
Fig. 3 is a top view of the experimental and firing channels and the high speed schlieren system applied.
Fig. 4 is a front view of the gas mixing section.
Fig. 5 is a top view of the outlet pipe of fig. 4, a first pipe connector, a second pipe connector, an outlet pipe connector, and a vacuum connection.
FIG. 6 is an enlarged view of a cross section of 8 different bend angle circular elbows with an inner diameter of 30mm and an outer diameter of 40 mm.
FIG. 7 is an enlarged view of a cross section of 8 different bend angle rectangular elbows with an inner diameter of 30mm and an outer diameter of 40mm and tubing.
1. A protective cover; 2. a device placement rack; 3. a chute; 4. a pulley bracket; 5. a vacuum pumping system; 6. an experimental pipeline; 7. an ignition tube; 8. a pipe connection; 9. a computer; 10. a gas mixing air inlet system; 11. a low energy pulse ignition device; 12. an air outlet pipe connector; 13. a pressure monitoring system; 14. a rear acrylic plate; 15. a front acrylic plate; 16. a side sub-force gram plate; 17. a high-speed schlieren system; 18. a ball valve; 19. and a cross beam.
8 pipe connection: a first pipeline connecting piece 8-1 or a second pipeline connecting piece 8-2;
10 gas mixing air inlet system: a gas mixing tank 10-1, a gas cylinder 10-2, a mass flowmeter 10-3 and a gas outlet pipeline 10-4;
5 vacuumizing system: a vacuum pump 5-1 and a vacuum connection piece 5-2;
17 high-speed schlieren system: a high-speed camera 17-1, a first focusing lens 17-2, a second focusing lens 17-5, a schlieren edge 17-3, a schlieren concave mirror 17-4 and a schlieren light source 17-6;
18 ball valve: ball valve one 18-1, ball valve two 18-2.
Detailed Description
The utility model will be further described with reference to the accompanying drawings
An experimental device for propagation of premixed gas flame in a pipeline, the device comprises
The protective cover 1 is connected with the device placing frame 2 to form an external frame, and a chute 3 is arranged in the frame;
the experimental pipeline 6 is arranged and connected with the three sections of ignition pipelines 7, the ignition pipelines 7 are connected through a first pipeline connecting piece 8-1 or a second pipeline connecting piece 8-2, and the experimental pipeline 6 is connected with the vacuumizing system 5;
the pressure monitoring system 13 is arranged and connected to the first pipeline connecting piece 8-1, the tail end of the ignition pipeline 7 is connected with the gas mixing and air inlet system 10 through the outlet pipeline connecting piece 12, and the ignition head of the low-energy pulse ignition device 11 is connected to the outlet pipeline connecting piece 12; the pulley bracket 4 is connected with an opening at the bottom of the ignition pipeline 7 to support the ignition pipeline 7, and the high-speed schlieren system 17 is arranged at two sides of the ignition pipeline 7;
the protective cover 1 comprises a rear acrylic plate 14 and a front acrylic plate 15, and is used for performing large-angle switching;
one end of the pulley bracket 4 is fixed in the chute 3, and the other end is provided with threads and is used for being fixed in the bottom openings of the first pipeline connecting piece 8-1 and the air outlet pipeline connecting piece 12.
The mixed gas inlet system 10 comprises a mixed gas tank 10-1, a gas cylinder 10-2, a mass flowmeter 10-3 and an outlet pipeline 10-4;
wherein the gas mixing tank 10-1 is fixed on a cross beam 19 in the device placing frame 2; the gas outlet pipeline 10-4 is connected with the ignition pipeline 7 through a gas outlet pipeline connecting piece 12; the horizontal pipe of the air outlet pipe 10-4 is provided with a first ball valve 18-1 and a second ball valve 18-2 for controlling the process of flowing the premixed gas into the ignition pipe 7, and when the first ball valve 18-1 and the second ball valve 18-2 are opened, the premixed gas flows into the ignition pipe 7.
The vacuumizing system 5 comprises a vacuumizing pump 5-1 and a vacuumizing connecting piece 5-2; one end of a pipeline for vacuumizing is connected with the vacuumizing pump 5-1, and the other end of the pipeline is connected with the experiment pipeline 6 through the vacuumizing connecting piece 5-2.
The pressure monitoring system 13 includes 4 pressure sensors 13-1; the pressure sensor 13-1 is fixed in the openings at the tops of the vacuumizing connecting piece 5-2 and the pipeline connecting piece I8-1; the pressure sensor detects the pressure in the pipeline and then forms a pressure curve and stores the pressure curve on the computer 9.
The high-speed schlieren system 17 comprises a high-speed camera 17-1, a first focusing lens 17-2, a second focusing lens 17-5, a schlieren edge 17-3, a schlieren concave mirror 17-4 and a schlieren light source 17-6; the high-speed camera 17-1 is connected with the computer 9, and transmits the photographed flame image to the computer 9.
The top of the air outlet pipeline connecting piece 12 is provided with an opening for connecting with the ignition end of the low-energy pulse ignition device 11 so as to ignite premixed gas;
the first pipeline connecting piece 8-1 and the second pipeline connecting piece 8-2 are both used for connecting an ignition pipeline 7, and the difference is that the top openings of the first pipeline connecting piece 8-1 are different, the top opening of the first pipeline connecting piece 8-1 is used for fixing a pressure sensor, and the top opening of the second pipeline connecting piece 8-2 is used for fixing a fire head; when the ignition position is not changed, the ignition position is set as a pipeline connecting piece I8-1; when the ignition position needs to be changed, the first pipeline connecting piece 8-1 at the ignition position is replaced by the second pipeline connecting piece 8-2, and the ignition head is inserted into the top of the first pipeline connecting piece, so that the position of the ignition head is changed, and the ignition position is changed.
7 sliding grooves 3 are uniformly arranged at intervals of 25cm and are fixed at the top of the device placing frame 2;
the experimental pipeline 6 and the ignition pipeline 7 are both made of quartz glass tubes, so that the flame propagation condition can be conveniently observed.
The rear acrylic plate 14 and the front acrylic plate 15 are both in an upper-suspended window type structure, and the side acrylic plate of the protective cover 1 is an acrylic plate 16.
The whole frame of this device comprises upper and lower two parts, and 1 part is the safety cover, and high 0.6m, frame adoption aluminum alloy material except the bottom, and five sides inlay the ya keli board, for example 14, 15, 16 are the ya keli board, can reduce the harm that the accident appears causing. And 2, the frame part of the device placing frame is made of aluminum alloy material, and 1 and 2 can be freely detached. The rear acrylic plate 14 and the front acrylic plate 15 adopt a design of an upper-hung window type, can be freely opened and closed, and are convenient for equipment adjustment in experiments. And 3, 7 sliding groove tracks fixed on the frame 2, which can be matched with the pulley bracket 4 to support pipelines and other devices.
The working procedure is described below:
firstly, the vacuumizing pump 5-1 is started, the experiment pipeline 6 and the ignition pipeline 7 are vacuumized through the vacuumizing connecting piece 5-2, and at the moment, the first ball valve 18-1 and the second ball valve 18-2 are in a closed state. Then the gas is introduced into the gas cylinder 10-2, the mass flowmeter 10-3 is controlled by the computer 9, and the air inlet flow is further controlled, and the premixing is carried out in the gas mixing tank 10-1. After premixing is completed, the ball valve I18-1 and the ball valve II 18-2 are opened, premixed gas enters the ignition pipeline 7 through the gas outlet pipeline 10-4, 12 is a connecting piece for connecting the gas outlet pipeline 10-4 and the ignition pipeline 7, and the low-energy pulse ignition device 11 is used for ignition. The ignited premixed gas flame finally enters the experiment pipeline 6 through the ignition pipeline 7, and the pressure of the premixed gas flame can be transmitted to the computer 9 through the pressure sensor 13-1 to generate a pressure curve.
The pipe connector 8 is used for connecting the experiment pipe 6 and the ignition pipe 7, and ensures the tightness of the pipe. The top opening of the pipeline connecting piece II 8-2 is different from the pipeline connecting piece I8-1, the top opening of the pipeline connecting piece I8-1 is used for fixing the pressure sensor, and the top opening of the pipeline connecting piece II is used for fixing the fire head. The first pipeline connecting piece between pipelines can be replaced by the second pipeline connecting piece, the ignition head is inserted into the top of the first pipeline connecting piece, and the position of the ignition head is changed, so that the ignition position is changed. Meanwhile, the device can replace 8 circular pipelines shown in fig. 6 with 8 rectangular pipelines shown in fig. 7, and experiments in different types of pipelines can be performed. The high speed schlieren system 17 may store the image transmission of the flames in the experimental conduit 6 and the ignition conduit 7 in the computer 9. Wherein 17-1 is a high-speed camera, 17-2 and 17-5 are a first focusing lens and a second focusing lens, respectively, 17-3 is a schlieren edge, 17-4 is a schlieren concave mirror, and 17-6 is a schlieren light source.
In FIG. 5, 8 kinds of circular bent pipes with different bending angles are shown, wherein 6-1 is a bent pipe with a bending angle of 5 degrees, 6-2 is a bent pipe with a bending angle of 15 degrees, 6-3 is a bent pipe with a bending angle of 25 degrees, 6-4 is a bent pipe with a bending angle of 35 degrees, 6-5 is a bent pipe with a bending angle of 45 degrees, 6-6 is a bent pipe with a bending angle of 55 degrees, 6-7 is a bent pipe with a bending angle of 65 degrees, and 6-8 is a bent pipe with a bending angle of 75 degrees.
In FIG. 7, 8 kinds of rectangular bent pipes with different bending angles are shown, wherein 6-9 is a bent pipe with a bending angle of 5 degrees, 6-10 is a bent pipe with a bending angle of 15 degrees, 6-11 is a bent pipe with a bending angle of 25 degrees, 6-12 is a bent pipe with a bending angle of 35 degrees, 6-13 is a bent pipe with a bending angle of 45 degrees, 6-14 is a bent pipe with a bending angle of 55 degrees, 6-15 is a bent pipe with a bending angle of 65 degrees, and 6-16 is a bent pipe with a bending angle of 75 degrees. The 16 bent pipes in fig. 5 and 7 can be replaced at will, and when experimental pipes are selected, pipes with the same cross section and different bending angles can be selected to study the influence of different bending angles on the propagation characteristics of premixed flames; the same bend angle and different cross sections of the duct can also be selected to study the effect of different cross sections on the premix flame propagation characteristics.
In FIG. 6, a full cross-section of the evacuated connector 5-2, the gas outlet conduit connector 12, the first conduit connector 8-1, and the second conduit connector 8-2 is shown, wherein the top openings of the evacuated connector 5-2 and the first conduit connector 8-1 are configured to receive a pressure sensor, and the top of the second conduit connector 8-2 is configured to receive an ignition head; the top opening of the gas outlet pipe connector 12 can also be inserted into the ignition end of the low-energy pulse ignition device 11 for ignition. The outlet pipe connection 12, pipe connection one 8-1 and pipe connection two 8-2 may be threaded into the pulley bracket 4 for supporting the pipe.

Claims (9)

1. The utility model provides a premixed gas flame propagates experimental apparatus in pipeline which characterized in that: the device comprises
The protective cover (1) is connected with the device placing frame (2) to form an external frame, and a sliding groove (3) is arranged in the frame;
an experiment pipeline (6) is arranged and connected with a three-section ignition pipeline (7), the ignition pipelines (7) are connected through a first pipeline connecting piece (8-1) or a second pipeline connecting piece (8-2), and the experiment pipeline (6) is connected with a vacuumizing system (5);
the pressure monitoring system (13) is connected to the first pipeline connecting piece (8-1), the tail end of the ignition pipeline (7) is connected with the gas mixing air inlet system (10) through the air outlet pipeline connecting piece (12), and the ignition head of the low-energy pulse ignition device (11) is connected to the air outlet pipeline connecting piece (12); the pulley bracket (4) is connected with an opening at the bottom of the ignition pipeline (7) and used for supporting the ignition pipeline (7), and the high-speed schlieren system (17) is arranged at two sides of the ignition pipeline (7);
the protective cover (1) comprises a rear acrylic plate (14) and a front acrylic plate (15) and is used for performing large-angle switching;
one end of the pulley bracket (4) is fixed in the chute (3), and the other end is provided with threads and is used for being fixed in bottom openings of the first pipeline connecting piece (8-1) and the air outlet pipeline connecting piece (12).
2. A premixed gas flame propagation experimental device in a pipeline according to claim 1, wherein: the mixed gas inlet system (10) comprises a mixed gas tank (10-1), a gas cylinder (10-2), a mass flowmeter (10-3) and an outlet pipeline (10-4);
wherein, the gas mixing tank (10-1) is fixed on a cross beam (19) in the device placing frame (2); the air outlet pipeline (10-4) is connected with the ignition pipeline (7) through an air outlet pipeline connecting piece (12); the horizontal pipeline of the air outlet pipeline (10-4) is provided with a first ball valve (18-1) and a second ball valve (18-2) which are used for controlling the process of flowing the premixed gas into the ignition pipeline (7), and when the first ball valve (18-1) and the second ball valve (18-2) are both opened, the premixed gas flows into the ignition pipeline (7).
3. A premixed gas flame propagation experimental device in a pipeline according to claim 1, wherein: the vacuumizing system (5) comprises a vacuumizing pump (5-1) and a vacuumizing connecting piece (5-2); one end of a pipeline for vacuumizing is connected with a vacuumizing pump (5-1), and the other end of the pipeline is connected with an experiment pipeline (6) through a vacuumizing connecting piece (5-2).
4. A premixed gas flame propagation experimental device in a pipeline according to claim 3, wherein: the pressure monitoring system (13) comprises 4 pressure sensors (13-1); the pressure sensor (13-1) is fixed in the openings at the tops of the vacuumizing connecting piece (5-2) and the pipeline connecting piece I (8-1); the pressure sensor detects the pressure in the pipeline and then forms a pressure curve to be stored on a computer (9).
5. A premixed gas flame propagation experimental device in a pipeline according to claim 1, wherein: the high-speed schlieren system (17) comprises a high-speed camera (17-1), a first focusing lens (17-2), a second focusing lens (17-5), a schlieren incision (17-3), a schlieren concave mirror (17-4) and a schlieren light source (17-6); the high-speed camera (17-1) is connected with the computer (9) and transmits the shot flame image to the computer (9).
6. A premixed gas flame propagation experimental device in a pipeline according to claim 1, wherein: the top of the air outlet pipeline connecting piece (12) is provided with an opening for connecting with the ignition end of the low-energy pulse ignition device (11) so as to ignite premixed gas;
the first pipeline connecting piece (8-1) and the second pipeline connecting piece (8-2) are both used for connecting an ignition pipeline (7), and the difference is that the top openings of the first pipeline connecting piece (8-1) are different, the top opening of the second pipeline connecting piece (8-2) is used for fixing a pressure sensor, and the top opening of the second pipeline connecting piece (8-2) is used for fixing a fire head; when the ignition position is not changed, the ignition device is provided with a first pipeline connecting piece (8-1); when the ignition position needs to be changed, the first pipeline connecting piece (8-1) at the ignition position is replaced by the second pipeline connecting piece (8-2), and the ignition head is inserted into the top of the first pipeline connecting piece, so that the position of the ignition head is changed, and the ignition position is changed.
7. A premixed gas flame propagation experimental device in a pipeline according to claim 1, wherein: 7 sliding grooves (3) are uniformly arranged at intervals of 25cm and are fixed at the top of the device placing frame (2).
8. A premixed gas flame propagation experimental device in a pipeline according to claim 1, wherein: the experimental pipeline (6) and the ignition pipeline (7) are both composed of quartz glass tubes.
9. A premixed gas flame propagation experimental device in a pipeline according to claim 1, wherein: the rear acrylic plate (14) and the front acrylic plate (15) are both in an upper-suspended window type structure, and the side acrylic plate of the protective cover (1) is an acrylic plate (16).
CN202320479693.1U 2023-03-14 2023-03-14 Experimental device for propagation of premixed gas flame in pipeline Active CN220154430U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320479693.1U CN220154430U (en) 2023-03-14 2023-03-14 Experimental device for propagation of premixed gas flame in pipeline

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320479693.1U CN220154430U (en) 2023-03-14 2023-03-14 Experimental device for propagation of premixed gas flame in pipeline

Publications (1)

Publication Number Publication Date
CN220154430U true CN220154430U (en) 2023-12-08

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