Research on N2-inhibitor-water mist fire prevention and extinguishing technology and equipment in coal mine goaf

Liu, Hongwei; Wang, Fei

doi:10.1371/journal.pone.0222003

Cited by 21 publications

(11 citation statements)

References 45 publications

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“…One of the most promising means of volumetric fire extinguishing is temperature-activated water (hereafter-TAW), the high efficiency of its application for volumetric fire extinguishing is experimentally confirmed in the works [1][2][3][4][5]. TAW jets are a two-phase system consisting of vapor and droplet phase, the main mechanism of extinguishing TAW is the cooling of the combustion zone, that is, the impact on the physical side of combustion [4,15].…”

Section: Introductionmentioning

confidence: 93%

Research on new generation inhibitors

et al. 2022

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This article investigates the specific application of inhibitors in firefighting. The main emphasis is placed on the application of temperature-activated water jets (TAW). A generalized model of droplet motion in highly heated heat flows has been presented, taking into account not only the local heating of the droplet from heat flows, but also the integral, depending on the geometric and velocity characteristics of its motion.

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Section: Introductionmentioning

confidence: 93%

Research on new generation inhibitors

et al. 2022

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“…In study [12], a new type of N2-inhibitor-water fog (NIWM) technology was proposed to solve the problem of preventing and extinguishing a fire in the production part of a coal mine. Appropriate equipment has been developed and manufactured.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Establishing patterns of nitrogen application for fire safety of sunflower grain storage facilities

Tsapko

Sokolenko

Vasylyshyn

et al. 2022

EEJET

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The issue of using nitrogen to eliminate fires in granaries is related to ventilating the grain mass with nitrogen while it is necessary to take into consideration the change in gas concentration. Therefore, the object of this research was the value of the minimum concentration of nitrogen to eliminate the combustion of sunflower grain. It has been proven that in the process of thermal destruction of sunflower grain, the composition of gaseous products of thermal destruction of sunflower grain contains more than 70 % of combustible gases. Namely: carbon monoxide, over 51 %; hydrogen, about 5.7 %; and hydrocarbons with a total concentration of 13.72 %, which provide fire hazardous properties of organic material. Therefore, it should be noted that the release of the amount of combustible gases during pyrolysis requires a reduction in the amount of oxygen in the gas-air environment to eliminate fire sites. Obviously, such a mechanism for the decomposition of sunflower grain during pyrolysis is a factor in regulating the extinguishing process, due to which the amount of nitrogen to eliminate combustion increases. Comparison of experimental studies on the composition of gaseous products of thermal destruction of sunflower grain and studies to determine the minimum fire extinguishing concentration of nitrogen, at which combustion was stopped, made it possible to justify the use of nitrogen. Based on the study's results on the elimination with nitrogen of fire sites of sunflower grain, the values of the minimum fire extinguishing concentration were revealed at extinguishing, about 33.7 % by volume. At the same time, terminating the combustion of sunflower grain occurs with a decrease in the concentration of oxygen in the gas-air environment of about 14 %. The practical significance is the fact that the results obtained for determining the minimum fire extinguishing concentration of nitrogen make it possible to establish operating conditions for granaries when eliminating fire sites

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“…Liu and Weng in their paper [39] presented the N 2 -inhibitor-water mist (NIWM) technology to prevent and extinguish fires in the goafs in hard coal mines.…”

Section: Coal Spontaneous Combustion Hazard In Goafs-preventionmentioning

confidence: 99%

The Method of Combating Coal Spontaneous Combustion Hazard in Goafs—A Case Study

et al. 2020

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One of the major natural hazards occurring during the process of mining exploitation are endogenous fires. They cause very large material losses and constitute a threat to the health and life of the workers. Such fires usually start and develop in the goafs. The remaining coal and the oxygen-containing air flowing at a certain rate may lead to endogenous fires. The basic element of the assessment of the occurrence of an endogenous fire and the degree of its development is the chemical composition of the air flowing out of the longwall and the goafs. The monitoring of this composition also makes it possible to assess the severity of such a fire. The damage that can be caused by the endogenous fire requires scientific and experimental research being carried out on a wide scale in order to limit its occurrence and development. All papers and research mentioned in the paper aim to find a tool that will help to control the fires. The paper discusses the development of a new and original method of combating the threat of endogenous fires. It is based on the installation designed to feed an ash and water mixture or an ash and water mixture with carbon dioxide to goafs. The foundation of the paper is a method based on a vast depth of expertise and knowledge gained by the authors in the field of combating endogenous fires. The developed installation prepares and transports ash and water mixtures together with carbon dioxide to the zones with high probability of endogenous fires. The mixture is a preparation of the surface of a mine, and later, it is transported underground by pipelines to the goafs where a high level of the fire hazard was identified. The construction of the system and the composition of the mixture used are both original solutions; their practical application limited the process of spontaneous heating of coal. Monitoring the chemical composition of gases in the air of the goafs made it possible to control the effects of applied measures; it proved that carbon dioxide used as an inert gas disturbs the process of carbon oxidation, and the water and ash mixture limits the inflow of the air with oxygen. The advantage of the method is particularly evident in the case of the exploitation of deposits where coal has a short incubation time. This original approach allows for a better and more effective response to endogenous fires.

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Research on N2-inhibitor-water mist fire prevention and extinguishing technology and equipment in coal mine goaf

Cited by 21 publications

References 45 publications

Research on new generation inhibitors

Research on new generation inhibitors

Establishing patterns of nitrogen application for fire safety of sunflower grain storage facilities

The Method of Combating Coal Spontaneous Combustion Hazard in Goafs—A Case Study

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