System for automatically extinguishing fire in long tunnel and extinguishing method thereof

Abstract

The invention discloses a system for automatically extinguishing fire in a long tunnel and an extinguishing method thereof. The system comprises an emergency pipeline, a water tank, a PLC (programmable logic controller) and more than three single-zone extinguishing units, wherein the PLC is connected with each single-zone extinguishing unit via control cables respectively; each single-zone extinguishing unit comprises a nozzle, a pure-water high-pressure pump and an ultrahigh-pressure pipeline; the pure-water high-pressure pump is capable of outputting high-pressure water flow with the pressure intensity being higher than 14MPa; and the nozzle is a water-mist nozzle combining multiple nozzles. The method comprises the following steps: detecting; giving a fire alarm; and controlling the water supply, mist-spraying, backwater and the like by the PLC. The tiny fog droplets formed by the ultrahigh-pressure water flowing through the dedicated water-mist nozzle is adopted to extinguish fire, the tiny fog droplets can be rapidly vaporized when meeting the high-temperature flame and the volume thereof can expand by more than 1,700 times so as to greatly reduce the oxygen concentration of a protection zone and have the strong effects of cooling by vaporization and suffocation by oxygen isolation; and meanwhile, the fog droplets can surround the fire source and further prevent heat radiation and diffusion, thereby achieving the purpose of rapidly extinguishing fire.

Description

technical field [0001] The invention relates to a tunnel fire-fighting equipment, in particular to an automatic fire-extinguishing system for a long tunnel and a fire-extinguishing method thereof. Background technique [0002] With the rapid development of my country's national economy, the role of railways and highways as a transportation hub is becoming more and more significant. As an important part of railways and highways, tunnels play an increasingly important role in transportation research. Tunnels are places where vehicles pass through. With the development of economy, the density of vehicles passing through tunnels is increasing. Once a fire occurs, it is very easy to cause serious consequences such as mass casualties and property losses. Due to the complex geometric structure of the tunnel, poor ventilation conditions, generally strong chemical reactions of combustion materials, and intense heat transfer, the tunnel fire spreads quickly, the temperature rises rapi...

AI Technical Summary

Problems solved by technology

The fire extinguisher uses a gaseous fire extinguishing agent, which has low fire extinguishing efficiency and poor effect, and has certain harm to the environment and human body. After the fire is extinguished, the recovery of the facilities is slow, and the gas fire extinguishing system is expensive and the maintenance cost is high.

The standard distance between fire hydrants is 50m. Tunnel fires are mostly caused by vehicle fuel or flammable goods on board, and are likely to be accompanied by deflagration. It is difficult for fire hydrants to control such fires.

It can be seen that the main problems of the existing fire extinguishing system are low fire extinguishing efficiency, poor fire extinguishing effect, low degree of automation, and certain harm to the environment and human body.

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