An experimental device and experimental method for evaluating the effectiveness of additive-containing water mist fire extinguishing

Abstract

The invention discloses an experimental facility and an experimental method for the fire suppression effectiveness evaluation of additive-containing water mists. The experimental facility comprises an oxidizing agent flow quantitative supplying and conveying system, a combustible gas quantitative supplying and conveying system, a representation system, and a data acquisition and remote control system, wherein the oxidizing agent flow quantitative supplying and conveying system is composed of a frequency conversion vortex fan, a vortex shedding flowmeter, a small wind tunnel, an atomization device and a sprayer support; the combustible gas quantitative supplying and conveying system is composed of a columnar porous burner and an automatic gas distributing system; the representation system is composed of a water mist and flame action observation device, a flame temperature measurement device and a condensed phase grain size and speed measurement device. The experimental facility can realize quantitative supplying of air and combustible gas, the adjustability of the particle size distribution and the release amount of the liquid phase fire extinguishing agent and the adjustability of the concentration of additive, and the representation of the temperature of a position nearby a stagnation point, the particle diameter and the speed. The experimental facility can be used for screening high-efficiency water mist additives, quantitatively evaluating the fire suppression effectiveness for specific flames in the aspects of the variety and the concentration of the additive, and researching the physical and chemical mechanism of the action of the condensed phase fire extinguishing agent and the flame.

Description

technical field [0001] The invention relates to the technical field of fire safety, in particular to an experimental device and an experimental method for evaluating the fire extinguishing effectiveness of additive-containing fine water mist. Background technique [0002] Water mist is a clean and efficient fire extinguishing agent, and its main fire extinguishing mechanism is cooling, isolating oxygen and attenuating radiation. In order to improve the fire extinguishing performance of fine water mist, some physical and chemical additives are used to improve the atomization characteristics, wetting characteristics, and flame chemical suppression characteristics of fine water mist. However, the performance of water mist containing different additives in suppressing and extinguishing flames is different. It is necessary to quantitatively characterize the factors that affect the fire extinguishing ability of water mist, and to study the mechanism of action between water mist an...

AI Technical Summary

Problems solved by technology

Although the burner can quantitatively control the release of condensed phase fire extinguishing agent and characterize the particle size distribution of the condensed phase fire extinguishing agent, the planar opposing flame requires a high-precision burner positioning system and a highly stable gas transportation system, which is difficult to apply to ordinary experiments room; in this method, the consumption of combustible gas and compressed air is large, and the cost is high

It is difficult to provide accurate quantitative data in reduced-scale or full-scale simulation tests, and the cost of the test is high, so it is not suitable for the screening of fire extinguishing agents

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