Mechanism insight of shielded methane non-premixed jet flame extinction with water mist: OH-PLIF visualization and quantitative analysis of critical fire extinguishing

Liu, Yangpeng; Wang, Xishi; Tang, Qi; Li, Guochun; Pan, Chuanyu; Liu, Tong; Ni, Xiaomin; Wu, Yong Bo

doi:10.1016/j.firesaf.2022.103642

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…This includes the precise placement of temperature detection sensors and the arrangement of the suppression system. However, due to references to outdated fire suppression systems indicating specific placement conditions for sensors or extinguishing type (water-based), they impede the implementation of newer and more effective solutions, such as water mist systems, which are increasingly being used in other industrial sectors [33][34][35]. Additionally, despite numerous guidelines, these regulations do not provide any specific standards and power supply parameters that should be adopted for their development.…”

Section: Introductionmentioning

confidence: 99%

Determining and Verifying the Operating Parameters of Suppression Nozzles for Belt Conveyor Drives

Bałaga,

Kalita,

Siegmund

et al. 2023

Energies

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Drives in belt conveyors are critical components of the conveyor system, susceptible to various factors that can cause disruptions and energy losses. In underground mining conditions, the risk of drive fires is particularly hazardous. Therefore, it is necessary to develop highly effective fire suppression systems. However, there are no guidelines for designing such systems. This study presents a methodology for selecting and verifying the fire suppression systems for belt conveyor drives. The proposed AMIGA system for extinguishing fires on underground coal mine conveyor belts, incorporating spraying and water mist installations, is supported by a theoretical calculation methodology. This enables determining the number of required nozzles and flow rate for complete fire suppression. The development of a methodology for the selection and verification of the sprinkler system components utilized guidelines provided in the standard VdS 2109:2002-03 and the PN-EN 12845+A2 standard from 2010, while a novel approach is proposed for water mist parameters that has not been previously applied anywhere else, and is based on assessing the fire’s intensity and the persistent disruption of the energy balance of the combusted coal. The theoretical calculations for potential fire power facilitate the determination of the appropriate water flow rate for the spraying system to protect the upper belt drive. For the proposed AMIGA system, the potential fire power was calculated to be 10.33MJ/min. Based on this, the water flow rate for the spraying installation to protect the upper drive belt of the conveyor was established to be a minimum 37.5dm3/min, and 21.4dm3/min for the mist installation used to protect the space below the conveyor drive. In order to verify the developed methodology for parameter selection, on-site tests were conducted to verify the results. Tests were conducted on an AMIGA prototype suppression system integrated into a conveyor drive. The results demonstrate that the developed system is effective in extinguishing fires on the belt using the spraying installation, as well as under the conveyor belt drive using the water mist installation, within the entire supply pressure range ( 0.4MPa to 1.6MPa ).

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Section: Introductionmentioning

confidence: 99%

Determining and Verifying the Operating Parameters of Suppression Nozzles for Belt Conveyor Drives

Bałaga,

Kalita,

Siegmund

et al. 2023

Energies

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“…This study analyzes the temperature, smoke, and other characteristics of the fire setting when a fire occurs in a cold storage facility and forms a water mist to conduct an experiment on fire extinguishing. Using the flame structure visualization of hydroxide planar laser-induced fluorescence (OH-PLIF) and quantitative parametric analysis, research by [6] determines the critical representative of a water mist to extinguish a shielded non-premixed jet flame. In critical fire-extinguishing situations, the effect of a barrier on water mist and a jet flame is quantified using the flame obscuration ratio kf and the maximum effective mist ratio k. This study proves useful for the optimal design of water mist systems in incidents involving natural gas leakage under shielded conditions.…”

Section: Introductionmentioning

confidence: 99%

Nozzle diameter and expansion ratio of compressed air foam system

Farida,

Kusumohadi,

Fikri

2023

J. Phys.: Conf. Ser.

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Variations of nozzles are studied for Compressed Air Foam Systems (CAFS). The CAFS is a self-contained fire suppression system with the capability of injecting compressed air into the foam solution to create a dense mist. Even though this type of foam has a tighter, denser bubble structure that allows it to adhere to vertical and horizontal surfaces and penetrate the fire more deeply before the bubbles burst, thereby making it more effective, the nozzle of CAFS is weak. The experimental study has been done in order to find the expansion ratio of the nozzle. Four sizes of diameter nozzles are 5 mm, 10 mm, and 20 mm, and three holes are 20 mm. Nozzle diameter size has a correlation with bubble size. The highest expansion ratio is found in the nozzle with three holes 20 mm in diameter. It is followed by a nozzle with a 20 mm diameter, then a 10 mm diameter. The last finding is a nozzle with five diameters. The other founding is the linear correlation between nozzle diameter size and bubble size. But it is on the other way than the correlation between nozzle diameter and bubble size. The shorter the nozzle diameter, the faster the fire extinguishing time.

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Dissociation and ignition of methane hydrate when in contact with typical sources of fire hazard

et al. 2023

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Mechanism insight of shielded methane non-premixed jet flame extinction with water mist: OH-PLIF visualization and quantitative analysis of critical fire extinguishing

Cited by 3 publications

References 44 publications

Determining and Verifying the Operating Parameters of Suppression Nozzles for Belt Conveyor Drives

Determining and Verifying the Operating Parameters of Suppression Nozzles for Belt Conveyor Drives

Nozzle diameter and expansion ratio of compressed air foam system

Dissociation and ignition of methane hydrate when in contact with typical sources of fire hazard

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