Extinguishing method and device by water-mist of preheated water

Abstract

The invention relates to an extinguishing method and device by two-phase flow water-mist of preheated water. The method is characterized by comprising the following steps of: preheating the water before extinguishing fire, guiding the preheated water into a two-phase flow ultrafine water mist nozzle through a spiral-flow atomization mixer, and spraying the water mist to extinguish fire by adopting a stepwise extinguishing manner, i.e. carrying out single-phase flow preheated water extinguishment within 30 seconds after the system is started, and preheating a protected area; and starting a gaspath to carry out two-phase flow fire extinguishment after 30 seconds. The invention further discloses an extinguishing device by water-mist of the preheated water, which is characterized in that a heating device is additionally arranged in an extinguisher, wherein the water-mist extinguishing device is used for carrying out the single-phase flow preheated water fire extinguishment within 30s after the system is started, the protected area is preheated, and the gas path is started after 30s for carrying out the two-phase flow fire extinguishment.

Description

technical field [0001] The invention relates to a method and device for extinguishing a fire with fine water mist of preheated water, which is a substitute product for a haloalkane fire extinguishing system, and is mainly used in the field of fire protection. Background technique [0002] As a fire extinguishing agent, water has been widely used since the existence of human beings. From the original use of containers to hold water to extinguish fires, to modern fire hydrants, automatic sprinkler systems, water spray fire extinguishing systems, etc. The device of fire extinguishing, on the problem of how to use water to extinguish a fire, people's main research train of thought concentrates on utilizing the device of water and mixing other material (as blowing agent) two aspects in water. The water used is all water at normal temperature, and the fire extinguishing effect of water at high temperature (<100° C.) has not been found yet. The background and fire extinguishing...

AI Technical Summary

Problems solved by technology

[0005] 1. It is difficult to put out small fires

This situation is caused by the fire extinguishing mechanism of fine water mist. The water mist fire extinguishing system is a total flooding fire extinguishing system. Its main mechanism is suffocation. The evaporation of fine water mist is very small, and a large space cannot be suffocated by a small amount of water vapor, so it is difficult to extinguish small fires with fine water mist

In the initial stage of a fire, the fire is mainly small. As an automatic fire protection system, fine water mist is mainly aimed at initial fires. Since a small fire cannot be extinguished, it must wait for the fire to become larger before it can be extinguished. Therefore, the installation of a fine water mist system has lost its The significance of the automatic fire protection system, not to mention the replacement of halon

[0006] 2. It is easy to extinguish class B (liquid) fires, but difficult to extinguish class A (solid) fires, especially smoldering fires

[0007] 3. It is difficult to extinguish fire in winter or in a colder protected space

Use water vapor to drive water and use water vapor as the gas phase in the two-phase flow. First, it is impossible to generate water vapor at a high enough pressure during the heating process to drive water to spray out quickly, increasing the flow rate and speed of fine water mist. To improve the quality of atomization; second, the generation of water vapor is not easy to control, or its generation process is delayed, and a large amount of water must be heated to a high enough temperature to generate water vapor at the required pressure, which takes a long time. That's pretty bad for firefighting

Images