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System and method for testing critical pipe diameter of detonation of combustible gas

A test system and detonation tube technology are applied in the field of combustible gas test devices, which can solve the problems of less experimental data, the inability to arbitrarily change the diameter of pipes, and the influence of mixed gas measurement results.

Inactive Publication Date: 2013-09-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The measurement of the detonation critical pipe diameter in the prior art generally uses a horizontal pipe connected to another cylindrical container. The defect of this device is that the diameter of the pipe cannot be changed arbitrarily. For a certain mixed gas, only Measure a critical pressure value that can form a detonation, so the experimental data obtained are less and not systematic; on the other hand, what is obtained through this device is that the plane detonation propagates to the cylindrical detonation rather than the spherical detonation The critical pressure, which affects the measurement of the critical diameter of the detonation of the mixed gas

Method used

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  • System and method for testing critical pipe diameter of detonation of combustible gas
  • System and method for testing critical pipe diameter of detonation of combustible gas
  • System and method for testing critical pipe diameter of detonation of combustible gas

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Experimental program
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Embodiment 1

[0019] Embodiment 1: see attached figure 1 , a test system for combustible gas detonation critical pipe diameter, which includes: detonation pipe 1, spherical high-pressure container 2, oscilloscope and small pipe;

[0020] The detonation tube 1 is a rigid pipe with a length of 500 mm and a wall thickness of 10 mm. A spark plug 11 is arranged on the top thereof. The cross-section of the ignition head of the spark plug 11 is a circle with a radius of 3.5 mm, and its positive pole is located at the center of the circle. A layer of insulating ceramics is wrapped between the negative electrode and the positive electrode; the inner side of the top of the detonation tube 1 is provided with a spiral groove 12 with a length of 100mm; the detonation tube 1 is vertically deep from the top of the spherical high-pressure vessel 2 Its interior is located above the center of circle of the spherical high-pressure vessel 2 and the center of circle; by adding a small pipe into the inner diamet...

Embodiment 2

[0023] Embodiment 2: a kind of test method of combustible gas detonation critical pipe diameter, it uses the test system of combustible gas detonation critical pipe diameter as described above, and comprises the following steps:

[0024] A. Add a kind of small pipe to the inner diameter of the detonation tube 1 to change its inner diameter; fill the combustible gas to be measured into the spherical high-pressure vessel 2 through the pipe 23 and reach the set initial pressure value;

[0025] B. After the ignition circuit triggers the spark plug 11, the combustible gas to be measured in the detonation tube 1 is ignited to form an explosion wave; the time waveform diagram of the explosion wave reaching the optical probe 21 and the shock wave probe 22 is obtained by the oscilloscope ;

[0026] C. by the arrival time of the blast wave measured by the optical probe 21 and the shock wave probe 22, calculate the speed at which the blast wave reaches the optical probe 21 and the shoc...

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Abstract

The invention belongs to the technical field of prevention of combustible gas accidents and particularly relates to a device and a method for testing combustible gas. In a technical scheme, a system for testing a critical detonation pipe diameter of combustible gas comprises a detonation pipe, a spherical high-pressure container, an oscilloscope and small conduits. The detonation pipe is a rigid pipeline and produces electric sparks through circuit trigger after air inflation is completed in the spherical container, and a mixture gas is ignited to form detonation; a spiral groove is arranged at the inner side of the top end of the detonation pipe and used to convert the combustion of the mixture gas in the pipeline into detonation to form detonation waves which go deep into the spherical high-pressure container from the top end of the spherical high-pressure container; the spherical high-pressure container is provided with an optical probe and a shock wave probe; the inner diameter of the detonation pipeline is changed by adding the small conduits of different pipe diameters; and the oscilloscope is connected with the outputs of the optical probe and the impact wave probe. According to the invention, the critical pressure values of various combustible gases for forming and not forming spherical detonation can be determined.

Description

technical field [0001] The invention belongs to the technical field of combustible gas accident prevention, and in particular relates to a testing device and method for combustible gas. Background technique [0002] Combustible gas is widely used in the fields of energy, transportation and aerospace, but if it is used improperly, it will cause explosion accidents, and even cause more harmful detonation disasters. Judging the detonation sensitivity by measuring the critical diameter of combustible gas mixture can provide a basis for effective control of hazards in engineering production. The measurement of the detonation critical pipe diameter in the prior art generally uses a horizontal pipe connected to another cylindrical container. The defect of this device is that the diameter of the pipe cannot be changed arbitrarily. For a certain mixed gas, only Measure a critical pressure value that can form a detonation, so the experimental data obtained are less and not systematic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/22
Inventor 张博白春华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY