Compressed air foam applying and releasing device for fighting full-liquid-level fire of oil tank and using method using same

Abstract

The invention relates to a compressed air foam applying and releasing device for fighting a full-liquid-level fire of a floating roof tank and a using method using the same. The device comprises an applying and releasing device body, a duckbilled nozzle and a gun head, wherein the lower part of the applying and releasing device body is provided with a connecting port, and communicates with a foampipeline through the connecting port, a duckbilled nozzle connecting port and a gun head connecting port are formed in the upper part of the applying and releasing device body, and communicate with the duckbilled nozzle and the gun head respectively, when the full-liquid-level fire breaks out, the number of compressed air foam applying and releasing devices is determined under the premise that thedistance between any point of the fluid level of an oil tank and the position close to the boundary of one foam falling point is guaranteed to be not larger than 30m according to the diameter of theoil tank and the foam falling point range of the compressed air foam applying and releasing device, and the device has the effects of being simple in structure, convenient to use, safe, reliable, highin fire extinguishing efficiency, strong in anti-reburning capability and little affected by fire explosion, fire plume and environment wind speed, thoroughly solves the technical problem about fighting of the full-liquid-level fire of the large oil tank, and has good popularization and application values and potential.

Description

technical field [0001] The invention relates to a fire extinguishing device for a petrochemical storage tank, in particular to a compressed air foam releasing device and a using method for extinguishing a fire at the full liquid level of a floating roof tank. Background technique [0002] Due to the advantages of low oil loss, environmental protection, excellent safety performance, and land saving, large floating roof storage 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 storage tanks is getting bigger and bigger, and the number is increasing. At present, the largest internal floating roof storage tank for storing refined oil is 5×10 4 m 3 , with a diameter of 60 m, and the outer floating roof storage tank for storing crude oil is up to 15×10 4 m 3 , with a diameter of 100 m. At prese...

AI Technical Summary

Problems solved by technology

[0005] (1) The low-expansion foam system of the existing floating roof storage tank has a small flow rate, 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. Putting out the storage tank fire requires a large supply intensity and flow, so it cannot meet the fire fighting needs of large-scale storage tanks

[0006] (2) The existing low-expansion foam system of the floating roof storage 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, explosion and other factors to affect the foaming function and foam performance, and even cause the foam generator to Even 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 storage tanks

[0007] (3) The flow coverage distance of foam on the fire oil surface is limited, the maximum is generally not more than 30 m, and the diameter of large external floating roof storage tanks reaches 80 m, or even 100 mm, so the use of conventional tank wall low-expansion foam generators cannot achieve foam Cover the whole liquid surface

[0008] The large-flow mobile fire monitor is currently the most important means of extinguishing the fire on the full liquid surface of the oil tank, but it is greatly affected by the environmental conditions of the fire site, the fire extinguishing efficiency is not high, the anti-reburning ability is limited, and it needs to consume a large amount of fire water and foam fire extinguishing agent , unable to meet the fire fighting needs of the full liquid surface of large oil tanks

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