Comprehensive fire extinguishing system and fire extinguishing method for large floating roof tank fire

Abstract

The invention relates to a large-scale floating roof tank fire comprehensive fire extinguishing system and a fire extinguishing method. The large-scale floating roof tank fire comprehensive fire extinguishing system comprises a fixing compressed gas foam generating system, a one-way valve, a foam fire hydrant, a fire main pipe, a selection valve, a fire branch pipe, a duckbill-type foam discharging head and a combined-type foam discharging device. According to the remarkable difference between the flow required for extinguishing closed-circle fires and large-scale fires, the duckbill-type foamdischarging head and the combined discharging method with a bursting sheet foam gun are adopted, so that the fire extinguishing full coverage of the closed-circle fires, floating roof oil spilling fires and full-liquid level fires is achieved. The large-scale floating roof tank fire comprehensive fire extinguishing system and the fire extinguishing method have the advantages of good foam stability, high fire extinguishing efficiency, safety, reliability, large protection range, high fire extinguishing efficiency and high reburning resistance, small-flow compressed gas foams can be provided for the closed-circle fires, and the large-flow compressed gas foams can be further provided for the floating roof oil spilling fires and the full-liquid level fires, so that the different fire fightingrequirements are met.

Description

technical field [0001] The invention belongs to the technical field of petrochemical storage tank fire extinguishing, and in particular relates to a comprehensive fire extinguishing system and a fire extinguishing method for a large floating roof tank. Background technique [0002] Due to the advantages of low oil loss, environmental protection, excellent safety performance, and space saving, large floating roof tanks have become the main facilities for oil reserves in various countries. In recent years, with the continuous increase in the consumption and reserves of crude oil and refined oil in my country, the volume of large floating roof tanks is getting bigger and bigger, and the number is increasing. At present, the largest internal floating roof tank for storing refined oil is 5×10 4 m 3 , with a diameter of 60 m, and the outer floating roof tank for storing crude oil is up to 15×10 4 m 3 , with a diameter of 100 m. At present, my country has built 9 large-scale...

AI Technical Summary

Problems solved by technology

[0004] At present, the fixed fire extinguishing system of large floating roof tanks mainly adopts low-expansion foam system, which has problems such as low fire extinguishing efficiency, weak anti-reburning ability, easy failure due to fire and explosion, poor reliability, and limited fire extinguishing ability. Specifically:

[0005] (1) The existing low-expansion foam system for floating roof tanks is mainly fortified against the fire of the sealing ring. The goal is to extinguish the fire of the sealing ring, but it cannot cover larger-scale fires such as oil spill fires on the floating roof and full liquid surface fires.

[0006] (2) The flow rate of the low-expansion foam system of the existing floating roof tank is low, and the foam liquid separation time is short, the stability is not high, the fire extinguishing efficiency is not good, and the anti-resurgence ability is weak. Extinguishing the oil tank fire requires a large supply intensity and flow rate , so it cannot meet the firefighting needs of large-scale oil tank fires

[0007] (3) The existing low-expansion foam system of the floating roof tank mainly relies on the foam generator located on the top of the storage tank for foaming, which is easily affected by factors such as high flame temperature, smoke and dust, and explosion. The entire system fails, thus losing the technical advantages of fixed system directional application and rapid fire extinguishing, so it is difficult to meet the practical needs of continuous and effective foam supply and fire extinguishing protection for large-scale fire fighting of floating roof tanks

[0008] (4) The flow coverage distance of foam on the fire oil surface is limited, the maximum generally does not exceed 30 m, and the diameter of large external floating roof tanks reaches 80 m, or even 100 mm, so it is impossible to achieve foam coverage with conventional tank wall low-expansion foam generators full liquid

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