Gas extinguishing

The development of modern metropolitan fire safety has penetrated into every detail of our life and work, different areas, different equipment, different places to choose fire extinguishing agent at the same time liquid separation.

CO2

Carbon dioxide is the most common fire extinguishing gas (chemical formula: CO2 is a common greenhouse gas in the air, is a gaseous compound, carbon and oxygen reaction to produce carbon dioxide chemical formula, carbon dioxide molecules from two oxygen atoms and one carbon atom through covalent bond, colorless and tasteless at room temperature, non-flammable, non-flammable gas, density is higher than air, slightly soluble in water, and water reaction produces carbonic acid. Carbon dioxide compression known as dry ice industry can be through the intense decomposition of calcium carbonate, laboratories generally use limestone (or marble) and dilute hydrochloric acid reaction system.

Physical property

Liquid surface tension: 3.0 up to/cm

Density: 1.816kg/m3

Viscosity: 0.064mPa·s

Critical temperature: 31.06℃

Critical pressure: 7.383MPa

Critical volume: 10.6Kmol/m3

Carbon dioxide extinguishing agent is a fire extinguishing agent with a history of more than 100 years. It's cheap, easy to get, and easy to prepare. It is used primarily as a choking effect and some cooling effects. Carbon dioxide has about 1.5 times the density of air. At atmospheric pressure, liquid carbon dioxide will evaporate immediately, and usually 1kg of liquid carbon dioxide will produce about 0.5 cubic meters of gas. Thus, carbon dioxide gas can expel air and surround it on the surface of the burning object or distribute it in a more confined space. Oxygen concentration near the combustible or protective space is reduced, producing asphyxiation. When carbon dioxide is discharged from the storage container, the liquid rapidly evaporates into a gas, and some of the heat is sucked in from the surrounding effect.

Application: Liquid carbon dioxide fire extinguisher under pressure, liquid carbon dioxide into a small cylinder. This fire extinguisher can be used to extinguish books, valuable equipment, precision instruments and other books.

Cons: Carbon dioxide is a major greenhouse gas. As carbon dioxide insulates, it gradually increases the temperature of the Earth's surface. In the past 100 years, the global temperature has risen by 0.6℃. If this trend continues, the global temperature is expected to rise by 1.5 to 4.5℃ by the middle of the 21st century. The rising sea level caused by the greenhouse effect will also have a great impact on human living environment. Polar sea ice will melt. All these changes are equal to all living things.

IG541

IG541 is a mixture of IG541 extinguishing agent composed of 52% nitrogen, 40% argon, 8% carbon dioxide composed of three gas components, is colorless, tasteless, non-toxic, non-conductive gas, ozone depletion potential ODP = 0 greenhouse climate GWP = 0, atmosphere is very short, is a green environmental protection fire extinguishing agent.

IG-541 mixed gas fire extinguishing system is composed of automatic fire detector, automatic alarm controller, automatic control device, fixed fire extinguishing device, pipe network, nozzle, etc. The starting modes of fire extinguishing system are divided into automatic starting, manual starting and mechanical emergency starting. According to the requirements of use, it can be composed of an independent unit system, combined power distribution system, using the full flooding way to achieve a single protection area, multi-protection area fire protection.

Scope of application: Mainly applicable to computer room, communication room, power distribution room, oil-immersed transformer, self-owned generator, library, archives, museum and cultural heritage Bureau, cultural heritage database, often work, can be used to fight electric fire, liquid fire or soluble solid fire, solid surface fire and fire can be used to cut off the gas source, but can not be used to fight D class active metal fire.

IG-541 mixed gas fire extinguishing mechanism belongs to the physical fire extinguishing mode: after the oxygen concentration released by the mixed gas decreases, it cannot burn to eliminate the fire source. Protected areas typically contain 21% oxygen and less than 1% carbon dioxide. Most of the fuel will stop burning when the oxygen level in the protected area falls below 15%. The gas mix reduces oxygen to 12.5% and raises carbon dioxide to 4%. The proportion of carbon dioxide that increases the body's breathing rate and oxygen uptake capacity to supplement the low oxygen atmosphere in the atmosphere. Fire extinguishing system

HFC-227ea

HFC-227ea/FM200 (HFC-227EA/FM200) is a kind of chemical fire extinguishing agent, which has the function of physical fire extinguishing agent and cleaning gas. Colorless, tasteless, low toxicity, non-conductive, do not pollute protected objects, and cause equipment safety damage; Can reduce the concentration of fire, reliable B, C fire and electric fire; Small storage space, high critical temperature, low critical pressure, liquefaction storage at room temperature; Or oily residue, no damage to the atmospheric ozone layer (ODP value is zero), the residence time in the atmosphere is 31 ~ 42 years, in line with environmental protection requirements.

Performance parameters:

Since HFC-227ea does not contain chlorine or bromine and will not damage the ozone layer in the atmosphere, it is used to replace Halon 1301 and Halon 1211 as fire extinguishing agent raw materials. Hfc-227ea fire extinguishers in engine room and other important places with environmental hazards are widely used as fire extinguisher materials. Hfc-227ea has a life cycle of about 31 to 42 years in the atmosphere, when it's released there's no residue or grease left behind, it can be removed through normal exhaust channels, so it's suitable for use as a fire extinguishing agent in data centers or server storage centers and usually where it will be a tank with a compressed HFC-227ea tank, mounted on the top of the floor, when there's a fire, Hfc-227ea is discharged from the tank outlet, oxygen is placed in the fire site, and cooling occurs, so the purpose of extinguishing the fire is achieved. Hfc-s aerosols belong to two of the three kinds of gas extinguishing.

Hfc-227ea, although relatively stable at room temperature, still breaks down at high temperatures, and hydrogen fluoride breaks down, giving it a pungent taste. Other products of combustion include carbon monoxide and carbon dioxide.

Contact with liquid HFC-227ea can cause frostbite.

Hfc-227ea can also be used as a propellant for launching rockets.

Hfc-227ea is used in inhaled doses for dispensing, such as inhalers used for asthma treatment.

Hexafluoropropane fire extinguishing agent has good cleanliness - completely evaporated in the atmosphere without residue, good gas phase electrical insulation, suitable for comprehensive inundate fire, to prevent electric fire, liquid fire or fusing solid fire, solid surface fire, before the fire gas can cut off gas fire, protect the computer room, communication room, power distribution room, precision machine room, power room, oil depot, Chemical flammable warehouse, library, database, archives, storeroom and other places. Hfc-227ea gas fire extinguishing system has reasonable structure and reliable function, and has been widely used in electronic computer room, archives, program control exchange room, television broadcasting center, financial institutions, government agencies and other important places.

This article is published by Guangzhou Rong 'an Fire Equipment Co., LTD