Arrangement structure and fire extinguishing method of large-size high-expansion foam fire extinguishing system

Abstract

The invention relates to the field of foam fire extinguishing system design technologies, in particular to an arrangement structure and a fire extinguishing method of a large-size high-expansion foam fire extinguishing system. The arrangement structure of the large-size high-expansion foam fire extinguishing system is characterized in that protection zones under jurisdiction are divided into a plurality of subzones, and each subzone comprises a centralized control fire pump station and a fire control center; each subzone is provided with a pressure proportional tank bag-type foam fire extinguishing device and foam concentrate is stored in a storage tank; high-expansion foam generators are arranged in each protection zone; and the distance from the fire pump station to each protection area satisfies the condition that the delay time from the moment of an alarm to the moment that the foam generator starts to spray foam does not exceed 30s. Compared with the prior art, the arrangement structure and the fire extinguishing method of the large-size high-expansion foam fire extinguishing system have the beneficial effects that 1, the distance from a proportional mixer to each protection area is shortened and the time from the moment that the fire extinguishing system is started to the moment that the foam generator starts to spray foam is reduced; 2, since pressure water and the foam concentrate are separated by a diaphragm bag in the tank, the service life of the foam concentrate is prolonged; and 3, the goal that the delay time from the moment of the alarm to the moment that the foam is started to be sprayed does not exceed 30s is realized, and the international specification is met.

Description

technical field [0001] The invention relates to the technical field of foam fire extinguishing system design, in particular to an arrangement structure and a fire extinguishing method of a large-scale high-expansion foam fire extinguishing system. Background technique [0002] High-expansion foam fire extinguishing schemes are generally used in fire extinguishing systems in dangerous places such as underground lubrication stations, hydraulic stations, and underground oil depots in metallurgical enterprises. The American and German standards stipulate that the time from receiving a definite fire alarm signal to the foam generator starting to spray foam for the high-expansion foam fire extinguishing system is less than 30s, that is, the time from system startup to the foam generator starting to spray foam is less than 30s. Now my country has stipulated in "Code for Design of High Expansion and Medium Expansion Foam Fire Extinguishing System" GB50196-93 (2002 Edition) and "Code...

AI Technical Summary

Problems solved by technology

These two methods have disadvantages: the first method, due to the degradability of the foam liquid, after the foam liquid and water are mixed, it will degrade quickly and fail, and the foam liquid needs to be replaced continuously, resulting in a lot of waste

The second method is to use pipelines to store foam stock solution for a long time, transport foam stock solution through long-distance pipelines and install a large number of proportional mixers. On the one hand, foam stock solution is prone to failure when stored in pipelines. substantial improvement

From the perspective of technical safety and economic reliability, the two design schemes are unreasonable

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