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System and method for testing flame propagation speed in premixed gas deflagration process

A technology of flame propagation velocity and deflagration process, which is applied in fluid velocity measurement, photometry, velocity/acceleration/shock measurement, etc., and can solve the problem of not being able to be used directly, and not accurately testing the gas/air premixed gas flame propagation velocity system Or methods and other issues to achieve the effect of failing to accurately test the flame propagation speed

Pending Publication Date: 2021-01-15
NORTH CHINA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this system cannot be directly used in the coal mine industry, and there is no system or method in the prior art that can efficiently, quickly and accurately test the flame propagation velocity of the gas / air premixed gas in the deflagration process

Method used

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  • System and method for testing flame propagation speed in premixed gas deflagration process
  • System and method for testing flame propagation speed in premixed gas deflagration process
  • System and method for testing flame propagation speed in premixed gas deflagration process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Such asfigure 1 As shown, the system for testing the flame propagation velocity during the deflagration of premixed gas provided by the present invention includes a shock tube 1, a sensor base 2, an optical fiber 3, a photodiode 4, a power supply 5, a resistor 6, an oscilloscope 7, a data acquisition system 8 and Computer 9.

[0044]At least two sensor blocks 2 are provided on the top of the shock tube 1. The shock tube 1 is used to simulate the gas deflagration process in a coal mine to obtain the light signal of the gas / air premixed gas deflagration flame. Each sensor block 2 passes through an optical fiber 3 Connect the input terminal of a photodiode 4. The photodiode 4 is used to convert light signals into electrical signals. The photodiode 4 works under reverse voltage. When there is no light, the reverse current is extremely weak, called dark current; When there is light, the reverse current rapidly increases to tens of microamperes, which is called photocurrent. The greate...

Embodiment 2

[0054]Based on the above-mentioned test system for the flame propagation speed during the premixed gas deflagration process, the present invention also provides a test method for the flame propagation speed during the premixed gas deflagration process, which includes the following steps:

[0055]1) Connect each photodiode 4 and the data acquisition system 8 to a constant power supply, connect the data acquisition system 8 to the computer 9, and turn on the constant current source, data acquisition system 8 and computer 9 after turning on the power supply. Acquisition system 8 and computer 9.

[0056]2) At least two sensor seats 2 are arranged on the top of the shock tube 1, and the shock tube 1 simulates the gas deflagration process in the coal mine to obtain the light signal of the gas / air premixed gas deflagration flame.

[0057]3) The optical signal is transmitted to the corresponding photodiode 4 through each sensor base 2 via the corresponding optical fiber 3, and each photodiode 4 resp...

Embodiment 3

[0065]The following specific examples are used to verify the effectiveness of the test system of the present invention in detail:

[0066]Set up experimental equipment such asFigure 5 Shown inFigure 5 Among them, the number 1 is the shock tube, the number 2 is the premixed gas supply system outside the tank, the number 21 is the premix tank system, the number 211 is the premix tank, the number 212 is the gas cylinder, the number 213 is the air compressor, and the number is 22 is the vacuum system, number 221 is the vacuum pump, number 23 is the control cabinet system, number 231 is the first control cabinet, number 232 is the second control cabinet, number 3 is the pressure signal acquisition system, and number 4 is the flame signal acquisition system. Number 5 is Donghua data acquisition system, number 6 is high voltage ignition system, number 7 is synchronous control system, number 71 is function signal generator, number 72 is time delay device, number 73 is solid state relay, shock ...

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Abstract

The invention relates to a system and a method for testing flame propagation velocity in a premixed gas deflagration process, which are characterized by comprising a shock tube, sensor seats, an optical fiber, a photodiode, a data acquisition system and a computer; at least two sensor seats are arranged at the top of the shock tube, each sensor seat is connected with the input end of a photodiodethrough an optical fiber, and the output end of each photodiode is connected with one end of a power supply and one end of a resistor in parallel. The other ends of each power supply and each resistorare respectively connected with a data acquisition system; the data acquisition system is also connected with a computer; the data acquisition system is used for acquiring electric signals convertedby the photodiodes and occurrence time of the electric signals; and the computer is used for determining the flame propagation speed of gas / air premixed gas deflagration. The testing system and methodcan solve the problem that the flame propagation speed cannot be accurately tested, and can be widely applied to the field of safety science and technology.

Description

Technical field[0001]The invention relates to a test system and method for flame propagation speed in the process of premixed gas deflagration, and belongs to the field of safety science and technology.Background technique[0002]Premixed gas deflagration brings great disasters to safe production, not only in coal mines, but also in chemical plants and other sites. Premixed gas deflagration involves academic issues such as flame acceleration mechanism, deflagration propagation characteristics, and deflagration-to-detonation transition, and deflagration accidents mostly occur in environments with complex structures, resulting in a very complex deflagration propagation process. The physical and chemical mechanisms involved are still Did not reveal clearly. At the same time, this type of problem has always been a classic and cutting-edge problem studied by mechanics and safety disciplines. Although various countries and regions have set up many projects to study such problems, accidents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/18G01J1/44G01J1/04G01L5/00
CPCG01P5/18G01J1/44G01J1/0425G01L5/0052G01J2001/446
Inventor 胡洋吴秋遐杨雨欣秦汉圣
Owner NORTH CHINA INST OF SCI & TECH
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