Experimental device and method for measuring dust explosion characteristics under visual isobaric condition

Abstract

The invention relates to an experimental device and method for measuring dust explosion characteristics under a visual isobaric condition. The device comprises a gas distribution system, an intelligent control system, a device bracket, a powder storage tank, a gas intake duct, a nozzle, a latex balloon bracket, an igniter combination system, and a latex balloon globe. The gas distribution system comprises one or more combination gases of air, flammable gas or inert gas; the intelligent control system comprises a programmable control unit and a remote control unit, and a venting element is programmed to control gas intake, powder spraying and ignition; a high-pressure gas inlet hole is formed inside the powder storage tank, and a dust-distributing injection hole is connected to the upper part of the powder storage tank; an opening is formed in the middle of the nozzle and connected with the gas intake duct, a dust injection duct, an igniter and a corresponding sensor. The experimental device is simple in operation, the experimental method is easy to perform, and the experimental phenomenon is obvious. The explosion phenomenon can be directly observed through the latex balloon globe,and the influence of the wall effect is eliminated.

Description

technical field [0001] The invention relates to the field of researching dust explosion combustion phenomena, in particular to an experimental device and method for measuring dust explosion characteristics under visualized equal pressure conditions. Background technique [0002] With the deepening of social industrialization, various dust substances are also produced, and various dust combustion explosion accidents are also coming one after another. The various dust explosion accidents in my country in recent years are analyzed. A large number of dust explosion accidents have led domestic and foreign researchers to carry out a lot of research work on dust explosions. [0003] Most of the existing test devices for dust explosion are Hartmann tube (1.2L), 20L spherical explosion container and 1m 3 Exploding container. The Hartmann tube is mainly used to test the minimum ignition energy of dust (Fire Science and Technology, 2016); the 20L spherical explosion test device is mai...

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Problems solved by technology

Although the above devices are equipped with observation windows, due to the small size or limited confined space, it is impossible to observe the changes of the flame structure, the mechanism of instability and the formation of turbulence during the flame propagation process of the dust under constant pressure conditions. The law of combustion reactions such as the effect of the instability of the interface between the burned and unburned regions on the flame acceleration

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