Test method and test device for critical fire extinguishing concentration of clean chemical liquid fire extinguishing agent

Abstract

The invention relates to a testing method and testing device for the critical extinguishing concentration of a clean chemical liquid extinguishing agent. Based on the principle of mass conservation, an improved cup type combustor testing device suitable for the liquid extinguishing agent is established by adopting a mode of quantitatively conveying the liquid extinguishing agent with a peristaltic pump and rapidly vaporizing with a vaporization cavity, and the critical extinguishing concentration of the extinguishing agent is given through experiment testing and theoretical calculation. The initial temperature of the vaporization cavity of the testing device is set to be over the boiling point of the extinguishing agent plus 30 DEG C, so that rapid vaporization of the clean chemical liquid extinguishing agent at different flows is ensured, continuous stable conveying of the extinguishing agent is realized, and the liquid extinguishing agent is introduced into a mixer after being mixed with the air in a gas state for performing extinguishing testing. The method and the device have the beneficial effects that the critical extinguishing parameter of the liquid extinguishing agent can be tested accurately. Moreover, the method and the device have the advantages of high operability, high testing accuracy, safety, reliability and low cost, and can be applied to screening and extinguishing performance evaluation of various novel Halon substituent extinguishing agents.

Description

technical field [0001] The invention relates to a test method and a test device for the fire extinguishing performance of a fire extinguishing agent, in particular to a test method and a test device for the critical fire extinguishing concentration of a clean chemical liquid fire extinguisher. Background technique [0002] Since the halon fire extinguishing agent was eliminated due to environmental problems, countries all over the world are developing new halon substitutes. At present, researchers have got rid of the original idea of ​​screening halon substitutes in halogenated alkanes, and are looking for environmentally friendly halon substitutes with excellent performance from clean chemicals such as brominated olefins and fluorinated ketones that can be degraded in the troposphere. Extinguishing agents such as 2-bromo-3,3,3-trifluoroalkene (CF 3 CBr=CH 2 ) is an unsaturated hydrocarbon. When it is released into the atmosphere, the carbon-carbon double bond is very easy...

AI Technical Summary

Problems solved by technology

At home and abroad, when testing the critical fire extinguishing concentration of halon and its alternative fire extinguishing agents, cup burner test devices are usually used, but the existing cup burner test devices and their test methods are only suitable for fire extinguishing agents that are gaseous at room temperature , while brominated olefins, fluorinated ketones and other new clean chemical fire extinguishing agents have a relatively high boiling point and are usually liquid at room temperature. For example, the boiling point of 2-bromo-3,3,3-trifluoroolefin is 34°C. The boiling point of dodecafluoro-2-methylpentan-3-one is 49°C, which cannot be tested based on the existing cup burner test device and method

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