Multi-agent combined fire extinguishing system and method based on liquid carbon dioxide

Abstract

The invention discloses a multi-agent combined fire extinguishing system and method based on liquid carbon dioxide. The system involves a Dewar flask filled with the liquid CO2 in a sealed mode, wherein a gas-phase CO2 outlet of the Dewar flask is connected with a water tank, a foam liquid tank and a gas-liquid mixing chamber correspondingly; and a liquid-phase CO2 outlet of the Dewar flask, a liquid outlet of the water tank and a liquid outlet of the foam liquid tank are connected with the gas-liquid mixing chamber, and the gas-liquid mixing chamber is connected with a foam spray gun. The method is one of methods for extinguishing class A fire, class B fire and class E fire. The method for extinguishing the class A fire comprises the steps that carbon dioxide foam and water are sequentially used for fire extinguishing; the method for extinguishing the class B fire comprises the steps that the carbon dioxide foam and carbon dioxide gas are sequentially used for fire extinguishing; themethod for extinguishing the class E fire comprises the step that the carbon dioxide gas and water mist are sequentially used for fire extinguishing. The system can operate by weak current supply, canquickly extinguish class A, class B and class E fire disasters, has space fire extinguishing capacity, and solves the problem of reburning when a single fire extinguishing agent is used for extinguishing fire.

Description

technical field [0001] The invention belongs to the technical field of fire fighting, and in particular relates to a multi-agent combined fire extinguishing system and method based on liquid carbon dioxide. Background technique [0002] Foam fire extinguishing agent is a kind of fire extinguishing agent that forms fire extinguishing foam by chemical or mechanical methods. Its main principle of action is to form a layer of dense foam on the surface of combustibles (flammable liquid or solid), and realize fire extinguishing by covering suffocation, cooling and isolation. , is an effective fire extinguishing agent for extinguishing flammable liquid and solid fires. At present, compressed air foam is widely used in fire rescue, such as compressed air foam fire trucks, compressed air foam fire extinguishing systems, and compressed air foam fire extinguishers. In the oil tank fire accidents of petrochemical enterprises, the steam evaporated from the liquid in the oil tank fire ha...

AI Technical Summary

Problems solved by technology

In the oil tank fire accidents of petrochemical enterprises, the steam evaporated from the liquid in the oil tank fire has the characteristics of high temperature and flammability; Combustion-supporting components, so it is difficult to quickly extinguish the combustibles floating in the air, and there is a problem of secondary re-ignition, so the use of a single fire extinguishing agent cannot effectively extinguish the fire of the oil tank liquid

Effective fire extinguishing agents for combustibles floating in the air are usually gaseous fire extinguishing agents with space fire extinguishing capabilities, such as inert gas fire extinguishing agents with components such as argon, nitrogen, and carbon dioxide, but carrying a variety of fire extinguishing facilities brings many advantages to fire extinguishing work. At the same time, the existing carbon dioxide foam fire extinguishing system has the problems of complex equipment and inconvenient implementation, which cannot meet the existing fire extinguishing needs

Images