CN205067404U - Combustible gas opens wide space explosion test device - Google Patents

Abstract

The utility model discloses a combustible gas open space explosion test device, which comprises a combustible gas bottle group (6), a pressure sensor (7), an infrared gas analyzer (14), a data collector (8), and an explosion-proof fan (10). And the ignition head (3), also includes a stainless steel tube frame (2) fixedly arranged on the ground, a film (4) is pasted on the top surface and surroundings of the stainless steel tube frame (2) and sealed with the ground, (4) Heating wire (17) is closely attached to the outside. The explosion test device of the utility model can realize combustible gas explosion tests under various working conditions in an open space, and the test results are accurate and reliable, providing pressure parameters of combustible gas explosions for scientific calculation and engineering design.

Description

Combustible gas open space explosion test device

technical field

The utility model belongs to the technical field of gas explosion mechanics test and research equipment, in particular to a test device capable of accurately and reliably realizing combustible gas explosion under various working conditions in an open space.

Background technique

With the further deepening of the national energy strategic plan, the reserves and consumption of oil and gas energy are increasing, and many security challenges are faced in the storage, transportation and use of oil and gas. As a form of accident with high frequency, oil and gas leakage explosion has attracted more and more attention. The explosion of combustible gas in open space has become an important content of gas explosion research. As oil and gas energy are more and more closely related to people's production and life, the research on the explosion of combustible gas in open space becomes more and more important.

Existing experimental devices for combustible gas explosion in open space are listed in the literature [Cong Lixin, Bi Mingshu, Xiao Chuanbing. Effect of hemispherical grid-shaped obstacles on deflagration pressure wave of combustible gas cloud[J]. Coal Journal, 2007, 32(5 ):509-512.], during the test (as shown in Figure 1), the gas bag is filled with combustible gas from the gas supply system, the gas is ignited through the ignition system, and the overpressure generated by the gas explosion is recorded on the computer through the data acquisition system . Due to the existence of air pockets, the overpressure generated by the explosion must be large enough to break through the air pockets in order to spread outward. Therefore, if the pressure rise rate of the gas explosion is small, it will take a long time to rupture the membrane, which is very different from the ideal open space gas explosion process. Therefore, this test device has a very obvious impact on the explosion results of small volume combustible gases with low activity and low burning speed, which makes the results distorted. Secondly, in the preparation stage of the test, the airtightness of the gas will be seriously disturbed by the movement of the test equipment; and the test device left inside the gas will also affect the test results to a certain extent. On the other hand, the high temperature and strong light produced by the explosion of combustible gas will also affect the accuracy of the sensor.

Therefore, there are obvious problems in the prior art: the small-volume combustible gas explosion test device with low activity and low burning speed is unreasonable and is susceptible to external interference, which leads to distortion of results.

Contents of the invention

The purpose of this utility model is to provide a combustible gas open space explosion test device, which can accurately and reliably realize the combustible gas explosion test device under various working conditions in open space

The technical solution to realize the purpose of this utility model is: a combustible gas open space explosion test device, including a combustible gas bottle set, a pressure sensor, an infrared gas analyzer, a data collector, an explosion-proof fan and an ignition head, and also includes a fixed device A stainless steel pipe frame on the ground, a film is pasted on the top surface and surroundings of the stainless steel pipe frame and sealed with the ground, and a heating wire is closely attached to the outside of the film.

Compared with the prior art, the utility model has significant advantages:

1. It can realize the explosion test of combustible gas under various working conditions in open space:

2. The test result is accurate and reliable: the heating wire can melt the film before ignition, and the cover plate, fan and plastic plate used to fix the film can ensure the sealing of the test airbag and the explosion inside the gas during the whole test preparation process. There is no test device; the pressure sensor with water cooling system and filter diaphragm can record the pressure data more accurately; therefore, the test parameters are accurate and reliable.

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Description of drawings

Fig. 1 is a schematic diagram of an existing test device for combustible gas explosion in an open space.

Fig. 2 is a schematic diagram of a combustible gas open space explosion test device of the present invention.

Figure 3 is a detailed schematic diagram of the joints of the stainless steel tube frame, the film and the plastic plate.

Fig. 4 is a schematic diagram of the relative positions of the fan and the cover plate.

Fig. 5 is a detailed schematic diagram of the heating wire on the airbag.

In Figure 2-5, 1. High-speed camera, 2. Stainless steel pipe frame, 3. Ignition head, 4. Film, 5. Pressure reducing valve, 6. Gas bottle group, 7. Pressure sensor on the ground, 8. Data acquisition Device, 9. Computer, 10. Explosion-proof fan, 11. Cover plate, 12. Ignition head tether, 13. Plastic plate, 14. Infrared gas analyzer, 15. Infrared gas analyzer probe, 16. Intake pipe, 17. Heating wire.

detailed description

As shown in Figures 1 and 2, the combustible gas open space explosion test device of the present utility model includes a combustible gas cylinder group 6, a pressure sensor 7, an infrared gas analyzer 14, a data collector 8, an explosion-proof fan 10 and an ignition head 3, It is characterized in that it also includes a stainless steel tube frame 2 fixed on the ground, a film 4 is pasted on the top surface and surroundings of the stainless steel tube frame 2 and sealed with the ground, and a heating wire 17 is attached to the outside of the film 4 .

It also includes a high-speed camera 1 whose lens is set against the stainless steel pipe frame 2. To be able to capture the development of the flame in the test

A trench 18 for placing the explosion-proof fan 10 is provided on the ground inside the stainless steel pipe frame 2, and a cover plate 11 capable of covering the explosion-proof fan 10 and capable of moving horizontally is provided on the trench. Thereby it is ensured that the explosion-proof fan 10 does not need to be moved out of the stainless steel pipe frame 2 and is safe.

It also includes an ignition head tether 12, the ignition head 3 is fixed in the middle of the ignition head tether 12, and the two ends of the ignition head tether 12 are respectively fixed on a pair of diagonal columns of the stainless steel pipe frame 2 superior.

In order to ensure the airtightness of the airbag, and also to ensure that the film 4 will not leak air when it explodes, a pressure plate 13 for pressing the lower end of the film 4 is provided at the periphery of the stainless steel tube frame 2 in contact with the ground. Thereby the film 4 of superfluous length can be turned up and pressed under pressing plate 13,

The pressure sensor 7 is equipped with a water cooling system and a filter diaphragm. The pressure data can be recorded more accurately.

The film 4 is a polyethylene film with a thickness of 0.015mm. In order to minimize the influence of the film on the development of the detonation flame.

Considering the need to minimize the impact of the film on the development of the explosion flame, the thinnest (0.015mm) polyethylene film is used as the material of the airbag.

The probe 15 of the infrared gas analyzer is inserted into the air bag through the polyethylene film 4 to monitor the gas concentration in real time, which can ensure the accuracy and reliability of the gas density. After reaching the specified concentration, stop the inflation, turn off the explosion-proof fan 10, push the cover plate 11 to cover the explosion-proof fan 10, and slowly withdraw the probe 15 of the infrared gas analyzer. Therefore, during the whole test preparation process, the air bag has been in a sealed state, which ensures the accuracy of the gas concentration during ignition.

Before ignition, the heating wire 17 is energized, and after the polyethylene film 4 melts, the ignition head 3 is detonated.

By turning over and pressing the polyethylene film 4 of excess length under the plastic plate 13, the airtightness of the air bag is ensured. It is also guaranteed that the polyethylene film 4 will not leak air when it explodes.

Different gas volumes are obtained by changing the size of the stainless steel tube frame 2.

The ignition head tether 12 can be bound at any position on the stainless steel pipe frame 2, so that the position of the ignition head 3 can be arbitrarily designated.

The operating steps of the utility model test device are specifically:

1. Fix the built stainless steel pipe frame 2 on the ground;

2. Bind the ignition head tether 12 on the diagonal column of the stainless steel pipe frame 2, and install the ignition head 3 on the ignition head tether;

3. Paste the polyethylene film 4 on the stainless steel pipe frame 2;

3. Turn the excess polyethylene film 4 out and press it into the plastic plate 13 times;

4. Open the pressure reducing valve 5, and fill the air bag 4 with combustible gas from the gas bottle group 6 through the intake pipe 16;

5. Insert the probe 15 of the infrared gas analyzer into the airbag through the polyethylene film 16 to monitor the indoor concentration in real time, and at the same time turn on the explosion-proof fan 10 to mix the mixed gas in the airbag;

6. When the concentration reaches the specified value, close the pressure reducing valve 5 and the explosion-proof fan 10, push the cover plate 11 to cover the explosion-proof fan 10, and withdraw the probe 15 of the infrared gas analyzer;

7. After standing still for 30 seconds, turn on the electric heating wire 17, and after the polyethylene film 4 melts, detonate the ignition head 3, record the explosion pressure through the pressure sensor 7, and take pictures of the flame development process through the high-speed camera 1.

The explosion test device of the utility model is used to realize the explosion test of combustible gas under various working conditions in an open space, and to provide pressure parameters of combustible gas explosion for scientific calculation and engineering application. In addition, the iron plate, fan and plastic plate used to fix the film can ensure the absolute sealing of the test air bag during the whole test preparation process; the pressure sensor with water cooling system and filter diaphragm can record the pressure data more accurately; High-speed cameras were able to capture the development of the flames in the test.

Claims (7)

1. an inflammable gas wide open space explosion testing device, comprise flammable gas cylinder group (6), pressure transducer (7), data acquisition unit (8), infrared ray gas analyzer (14), explosion-proof fan (10) and igniter head (3), it is characterized in that: also comprise and be fixedly installed on ground stainless-steel tube framework (2), stick film (4) at described stainless-steel tube framework (2) end face and surrounding and seal with ground, being glued with heating wire (17) in described film (4) outside.

2. test unit according to claim 1, is characterized in that: also comprise the high-speed camera (1) that camera lens is arranged facing to stainless-steel tube framework (2).

3. test unit according to claim 1 and 2, it is characterized in that: the ground in described stainless-steel tube framework (2) is provided with the trench (18) placing explosion-proof fan (10), described trench is provided with and can covers described explosion-proof fan (10) and the cover plate (11) that can move horizontally.

4. test unit according to claim 1 and 2, it is characterized in that: also comprise igniter head tether (12), described igniter head (3) is fixed in the centre of igniter head tether (12), and the two ends of described igniter head tether (12) are separately fixed at being positioned on the column at diagonal angle for a pair of described stainless-steel tube framework (2).

5. test unit according to claim 1 and 2, is characterized in that: be provided with the pressing plate (13) for pushing down film (4) lower end described stainless-steel tube framework (2) and the periphery of earth surface.

6. test unit according to claim 1 and 2, is characterized in that: described pressure transducer (7) carries water-cooling system and optical filtering diaphragm.

7. test unit according to claim 1 and 2, is characterized in that: the polyethylene film that described film (4) is thickness 0.015mm.