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Experimental device for restraining gas and dust explosion by water mist

A dust explosion and experimental device technology, applied in the field of safety science and engineering experimental equipment, can solve the problems of reducing the pressure and energy of the explosion gas, and cannot fundamentally suppress the explosion, etc.

Inactive Publication Date: 2009-07-08
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vacuum chamber device absorbs the explosion gas and energy after the explosion occurs, thereby reducing the pressure and energy of the explosion gas, avoiding the damage caused by the explosion, and cannot fundamentally suppress the occurrence of the explosion.

Method used

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  • Experimental device for restraining gas and dust explosion by water mist
  • Experimental device for restraining gas and dust explosion by water mist

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this embodiment, the spherical burner experimental device that uses fine water mist to suppress gas and dust explosions is as follows: figure 1 As shown: the burner 13 is composed of upper and lower stainless steel hollow hemispheres fixed and sealed with bolts and rubber gaskets. A transparent tempered glass observation window 19 is provided on the upper part of the wall near the hemispherical joint 14. The top of the burner There is an air extraction hole 15 connected to the vacuum pump S6 through an air extraction valve; a pressure relief hole 16 is provided on the wall near the air extraction hole 15, and a nut 18 with a hole is used to seal and press the explosion-proof plate 17 to the pressure relief hole On the bolts, once overpressure, the explosion-proof disk will automatically rupture to achieve safe pressure relief, so as to avoid the device being damaged due to excessive pressure in the experiment; there are pressure sensor S1 and temperature sensor S2 bui...

Embodiment 2

[0021] figure 2 It is a schematic diagram of the structure of a rectangular column burner experimental device using fine water mist to suppress gas and dust explosions in this embodiment. One wall of the burner 13 is made of stainless steel, and the other three walls are made of transparent tempered glass. According to the theory of combustion and explosion, and considering the precipitation of dust under the action of gravity, in order to make the dust can fill the burner, the length-to-diameter ratio of the burner can be 1:6, and the rectangular column burner of this embodiment can be calculated accordingly equivalent size.

[0022] In the center of the top flange S11 of the burner 13, there is an air extraction hole 15 connected to the vacuum pump S6. An air extraction valve is provided on the pipeline between the air extraction hole 15 and the vacuum pump S6. Rubber is used between the top flange S11 and the wall of the burner. The gasket is sealed and fixed with bolts, an...

Embodiment 3

[0027] In this embodiment, an experimental device for suppressing gas and dust explosions by fine water mist is used. The burner is a stainless steel cylinder, and a transparent observation window is provided in the middle of the wall of the burner. A high-speed camera was used to take pictures of the experimental phenomena in the observation window. The gas is liquefied gas, the dust is wheat starch, and the ignition device is an electric spark igniter.

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Abstract

The invention discloses an experimental device adopting fine water mist to suppress gas and dust explosion. The experimental device is characterized in that a pressure-resisting airtight burner of the device is provided with a temperature sensor, a pressure sensor and an ignition device inside; the wall of the burner is provided with a transparent observation window and a pressure release hole pasted with an explosion-proof piece; the top of the burner is connected with a vacuum pump through a gas suction pipe with a valve; a flange base on the bottom of the burner is provided with a gas inlet pipe protruding inwards; a hollow hemispherical cover body with the spherical top protruding inwards is fixed above a nozzle of the gas inlet pipe; the flange base encircling the bottom of the outer wall of the gas inlet pipe is provided with an annular groove inside; the gas inlet pipe is respectively connected with a gas storage tank through a valve via an adjusting valve and an ultrasonic atomizer through a fine water mist inlet pipe, and is also communicated with the atmospheric environment; and dust inside the bottom flange groove is raised and suspended in the burner by means of inlet pressure. The experimental device can carry out explosion suppression experiment of gas, dust or gas-dust composite explosion and research on flame spreading rule and microstructure.

Description

technical field [0001] The invention belongs to the technical field of safety science and engineering experimental equipment, in particular to an experimental device for suppressing gas and dust explosions and their mixed explosions by using fine water mist. Background technique [0002] The frequent occurrence of gas and dust explosion accidents, especially gas or coal dust accidents, has led to more and more researches on gas and dust explosions, and corresponding experimental devices are needed to study explosion phenomena. "China Safety Production Science and Technology" magazine (2008, 4 (1), 108-111 pages) introduced the use of a 1.2-liter Harttman (Harttman) dust explosion tube and a 20-liter spherical explosion test device to study gas or dust The mechanism and phenomenon of explosion, but because it has no explosion suppression structure, it cannot be used to study the suppression of explosion. The master's degree thesis of North University of China (20060228) "Des...

Claims

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Application Information

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IPC IPC(8): G01N31/00
Inventor 王喜世许红利谷睿蔡昕廖光煊
Owner UNIV OF SCI & TECH OF CHINA
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