A multi-stage atomization type two-phase flow fine water mist generating device for preventing and controlling coalfield fires

Abstract

A multi-stage atomization type two-phase flow water mist generation device for controlling a coal field fire is suitable for managing a coal-rock cavity high-temperature zone in a large-area coal field fire zone.The device comprises a pressure water supply pipe, a multi-hole nozzle and a jet flow atomization barrel.An impact atomization chamber, a mixing acceleration chamber and a diffusion jet chamber are arranged in the jet flow atomization barrel in sequence.The end, close to the multi-hole nozzle, of the impact atomization chamber is provided with a hemispheric inner wall, and the inner wall is provided with a slant conical air suction hole so that the impact atomization chamber can be communicated with the external environment.Pressure water supplied by the pressure water supply pipe is preliminarily atomized through the multi-hole nozzle; external air is automatically sucked into the impact atomization chamber under negative pressure generated by jet flow of the nozzle to collide with mist flow formed in preliminary atomization, and secondary atomization is achieved; then, the mist flow and the air are further mixed and rubbed in the mixing acceleration chamber, and atomization is performed again; then, the atomized water is jetted to a coal field fire control zone through the diffusion jet chamber.The device does not need an additional compressed air system and is compact and simple in structure, safe, reliable, easy to operate, high in portability and high in atomization degree.

Description

technical field [0001] The invention relates to a multi-stage atomization type two-phase flow fine water mist generating device for preventing and controlling coalfield fires, and is especially suitable for controlling high-temperature areas of coal and rock cavities in large-area coalfield fire areas. Background technique [0002] Coalfield fires directly burn a large amount of non-renewable coal resources every year, seriously threatening energy security, the ecological environment around the fire area, and the health of local residents. In order to achieve efficient fire extinguishing, rapid replacement of the large amount of heat stored in the fire area is the key to the control of the fire area. The specific heat capacity and heat of vaporization of water are very high, and the effect of displacing the heat in the fire area is remarkable, and the cost is low and easy to obtain, so it is one of the most suitable coal field fire extinguishing materials. The fine water mi...

AI Technical Summary

Problems solved by technology

This method is more stable than single high-pressure atomization and collision atomization, but it must be equipped with a separate external power source gas supply system (such as air compressor, nitrogen generator, etc.) during the atomization process, as designed by researchers in this field. There is a Chinese invention patent with the publication number CN101915113A and the publication date of 2010-12-15 "a kind of nitrogen water mist generating device for mines", which presses nitrogen into the device through the nitrogen pipeline installed in the coal mine and collides with the water flow to achieve mist. change

Since coalfield fire areas in my country are mostly distributed in the wild or in mountainous areas, gas supply systems such as air compressors or nitrogen generators are not easy to carry and carry, making it necessary to configure a dual-fluid water mist atomization device with a separate external power source gas supply system at present. Inconvenient to use, poor portability and poor applicability in the process of coal fire control

In addition, this method simply uses artificial compressed air and water flow collision to achieve atomization. During the atomization process, the droplet size is too large and the atomization degree is low, which affects the fire-extinguishing and cooling effect of fine water mist.

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