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6. Analysis on combustion characteristics of pool fire in the confined space with horizontal ceiling openings

Author

Chen Bing, Zhang Shiqi, Shi Xunxian, Li Changhai, and Lu Shouxiang

Subjects
horizontal ceiling opening, confined space, pool fire, combustion characteristics, Naval architecture. Shipbuilding. Marine engineering, VM1-989
Abstract

[Objectives]The confined spaces such as the ship's engine room usually has a horizontal opening at the ceiling,and the particularity of the position and shape of the opening results in a significant difference between the combustion characteristics of the fire in such space and those of the building fire. In order to understand the fire characteristics of the horizontal ceiling opening of the ship's engine room,[Methods]the combustion characteristics of the fire such as the flame-extinguishing characteristics, flame shape and combustion rate in the confined space fire with a horizontal ceiling opening were experimentally studied by changing the ceiling opening area of the simulated test chamber and the size of the heptane oil pool,[Results]According to the reason for fire extinction,the development process of confined space fire are divided into "oxygen-lack extinguishing" mode caused by insufficient O2 concentration and "fuel-lack extinguishing" mode caused by depletion of combustibles. In the "oxygen-lack" mode,the flue gas mixture is entrained into the flame to participate in the combustion process. The critical O2 concentration for self-extinguishing of flame is between 13% and 16.5%,and the shape of the flame changes from a stable combustion shape to a state of being out of the oil pool and keeping moving. In the "fuel-lack" extinguishing mode,the flame is relatively stable in shape,and the combustion rate in the late combustion period is significantly increased due to boiling combustion.[Conclusions]The results show that the combustion characteristics of the fire in the confined space with ceiling opening are of great significance for understanding the development process of the cabin fire and provide theoretical support for the cabin fire suppression.

Published
2019
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14. The Flood Discharge Monitoring System based on Resource Virtual Mapping Algorithm

Author

Xingkai Zhang, Chenglong Yu, Shi Xunxian, and Enji Sun

Subjects
Flood discharge, Tailings dam, Resource (project management), Computer science, Culvert, 0202 electrical engineering, electronic engineering, information engineering, Key (cryptography), 020206 networking & telecommunications, 020201 artificial intelligence & image processing, 02 engineering and technology, 5G, Construction engineering
Abstract

Mining is an important part of the national economy and has always played a pivotal role in the rapid development of the national economy. The safety of tailings dam is key factor for the mining operation, especially the flood discharge safety. As the development of the 5G technologies, it is possible to monitor the safety of tailings dam remotely and intelligently. The data collector for flood discharge culvert is designed to scan the panorama hazards. The resource mapping algorithm is proposed to solve the mass users and bulk data transmission. The problem of inter-cell interference in a 5G ultra-dense network environment is addressed, and a wireless virtual mapping algorithm to reduce inter-cell interference is proposed in this system. The results show that this system can help the mine staff to improve the tailings dam safety in daily supervision.

Published
2020

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