Nitrogen automatic fire fighting system for sealed cable tunnel

Abstract

The invention discloses a nitrogen automatic fire fighting system for a sealed cable tunnel. The system comprises the sealed cable tunnel which is provided with an air vent, wherein the air vent is provided with a ventilating device and a fire valve; the cable tunnel is internally provided with a temperature sensor; the temperature sensor is electrically connected with an alarm controller; a nitrogen spraying pipeline penetrates through the cable tunnel; nitrogen spraying devices are distributed on the nitrogen spraying pipeline; the nitrogen spraying pipeline is communicated with a nitrogen delivery pipeline which is communicated with a nitrogen source; the nitrogen delivery pipeline is connected with a nitrogen release valve in series; and the nitrogen release valve is electrically connected with the alarm controller. The fire fighting system can be used for rapidly and effectively extinguishing cable fire hazards. By utilizing the fire fighting system, electrical hazards such as grounding, short circuit and shotfiring cannot occur, the purpose of safely extinguishing fire is achieved, the purpose of cleanly extinguishing fire is also achieved, an complex operation of cleaning superfine dry powder for a long time is omitted, and power supply can be rapidly recovered.

Description

technical field [0001] The invention relates to the technical field of fire safety, in particular to a nitrogen automatic fire-fighting system for a closed cable tunnel. Background technique [0002] Electrical and cable equipment generally use fine water mist fire extinguishing system or ultrafine dry powder to extinguish the fire. Although these two fire extinguishing methods can extinguish the fire and reduce the loss caused by the fire to a certain extent, it is very difficult to restore the operation of the electrical equipment after the fire is extinguished. The water in the water mist fire extinguishing system is easy to conduct electricity, and electrical accidents such as grounding, short circuit, and blasting of electrical and cable equipment in contact with water are prone to occur. Therefore, it takes a long time to ventilate and dry the electrical and cable equipment after fire extinguishing before resuming power transmission. The ultra-fine dry powder in the u...

AI Technical Summary

Problems solved by technology

The ultra-fine dry powder in the ultra-fine dry powder fire extinguishing system has strong adsorption. When extinguishing the electrical fire, it also adheres to the electrical equipment, which is difficult to clean. It still takes a long time to restore the operation of the electrical equipment after the fire

[0003] Although nitrogen is a safe, clean and cheap fire extinguishing gas resource, because it exists in a gaseous state, when a fire breaks out in a general (non-airtight) place, if nitrogen is used to extinguish the fire, nitrogen is easy to diffuse, especially after being heated. It is easier to spread quickly, the surrounding air (the oxygen in it) will still play a combustion-supporting role in the fire, and the fire still has a tendency to expand and spread, so nitrogen cannot play a role in extinguishing the fire. Therefore, those skilled in the art rarely use Nitrogen as an extinguishing agent or even using nitrogen as an extinguishing agent at all

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