A gas-liquid two-phase flow fire prevention and extinguishing system in goaf with bubble atomization

Abstract

The invention discloses a bubble atomizing goaf gas-liquid two-phase flow fire prevention and extinguishing system. The system is composed of a gas-liquid two-phase flow parameter control and adjusting device, a gas-liquid two-phase flow conveying pipeline and a gas-liquid two-phase flow three-dimensional spray pipe. The double pipe nesting design is adopted by the gas-liquid two-phase flow three-dimensional spray pipe, and a gas pipe densely provided with gas outlets is nested into a liquid pipe. Bubble atomizing nozzles which form 90-degree included angles with the spray pipe, bubble atomizing nozzles which form 60-degree included angles with the spray pipe, bubble atomizing nozzles which form 30-degree included angles with the spray pipe and a bubble atomizing nozzle which forms a 0-degree included angle with the spray pipe are sequentially arranged on the gas-liquid two-phase flow three-dimensional spray pipe. The four 90-degree bubble atomizing nozzles, the four 60-degree bubble atomizing nozzles and the four 30-degree bubble atomizing nozzles are evenly arranged around the spray pipe. The 0-degree bubble atomizing nozzle is arranged right ahead the center of the spray pipe. The atomizing taper angles of all the bubble atomizing nozzles are designed in 30-degree solid taper shapes. Through reasonable gas-liquid two-phase flow parameter control and adjustment, the gas-liquid two-phase flow three-dimensional spray pipe device can produce a large-area three-dimensional stopping fine water mist field with the good atomizing effect, large mist flux and high mist moving amount, and efficient fire prevention and extinguishing of a goaf is achieved.

Description

technical field [0001] The invention belongs to the field of fire prevention and control in mine goafs, and in particular relates to a gas-liquid two-phase flow fire prevention and extinguishing system for gas bubble atomization goafs. Background technique [0002] Mine fires seriously affect the production of coal mines, and are one of the most important disasters that threaten the safety of coal mine production. The direct and indirect economic losses caused by spontaneous combustion in coal mines are nearly 10 billion yuan every year. Spontaneous fires in mines account for 94% of the total number of fires, and spontaneous fires in goafs account for 60% of internal fires. Goaf fires will consume coal resources, burn mechanical equipment, cause gas and coal dust explosions, and produce a large amount of high-temperature flames and toxic and harmful gases. [0003] Currently existing goaf fire control technologies mainly include: plugging and pressure equalization anti-fire...

AI Technical Summary

Problems solved by technology

It is difficult for different fire prevention technologies to achieve good results in both prevention and economic benefits. Therefore, it is urgent to propose an economical and effective fire prevention technology for gobs.

[0004] Nitrogen fire prevention has the advantages of simple process, simple operation, easy to master, no pollution to the fire prevention area, less damage to equipment in the closed area, better dilution and explosion suppression, and effective suppression of air leakage in the fire prevention area, but at the same time there is cooling The effect is poor, and the shortcomings of high temperature points cannot be effectively eliminated

Although resistive water can play a good role in preventing and extinguishing fires in goafs, it is often difficult to achieve the desired effect because it cannot evenly cover the gobs; water mist fire extinguishing is a new type of fire prevention technology. It has both the cooling effect of the water sprinkler system and the suffocation effect of the gas fire extinguishing system, and can achieve the purpose of controlling fire, suppressing fire and extinguishing fire under the multiple functions of cooling, suffocation, heat radiation isolation and infiltration

[0005] CN103806932A discloses a method for preventing coal from igniting and extinguishing fire by using high-pressure nozzle atomization to achieve chemical reaction in the goaf. The defect of this method is that the high-pressure nozzle atomization used needs a high water pressure in order to produce an ideal atomization effect. (The water pressure for producing grade 1 water mist is greater than 10Mpa), which greatly increases the cost of the system, and at the same time, it is necessary to ensure that the nozzle nozzle is small enough (generally less than 1mm), and the nozzle is easily blocked; CN101915113B authorized a nitrogen fine water for mining The mist generating device can be used to add fine water mist during the nitrogen injection process through the setting of the water guide cyclone and the atomizer. CN103195462B authorized the liquid addition and atomization device during the mine nitrogen injection process. Mining nitrogen fine water mist generators all use traditional two-fluid atomization technology to achieve water atomization through the shearing action of high-speed flowing gas on water. Although this technology does not require high water pressure, it can achieve better The atomization effect is excellent (water pressure and air pressure are both between 0.3~0.7Mpa to produce a fine water mist), but the structure of the system is relatively complicated, and the liquid is atomized by the high-speed flow of aerodynamic force, and the air consumption is too large , the fog flux is low; CN103362534B authorized the nitrogen barrier fine water mist preparation system and fire prevention and extinguishing method for mine fire prevention and control, but did not introduce the specific atomization principle and atomization device in detail

[0006] The gas-liquid two-phase flow resistance and fine water mist fire prevention technology has a significant effect on fire prevention and control in mine goafs. At this stage, the design of the entire system including the atomization device in this technology is not reasonable enough, and it is difficult to really use this technology. Due to the advantages of technology, it is urgent to propose a gas-liquid two-phase flow fire prevention system for goafs in mines with good atomization effect, low energy consumption, remarkable control effect and strong operability.

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