Liquefied gas

gas is an important domestic fuel, it is produced in petroleum refining by a variety of low boiling point gas composition, no fixed composition. These low-boiling gases are composed of carbon and hydrogen, both of which can burn. These gases are liquefied at low temperatures and under pressure, so they are called liquefied gases. Its main components are propane about 7%, propylene about 27.5%, butane about 22.5%, butene about 43%. Liquefied gas is usually used in pressure-resistant steel cans. When the valve is opened, the pressure decreases and the liquefied gas changes from liquid to gaseous. It generates water and carbon dioxide when ignited and burns, releasing a lot of heat. Compared with urban gas, the heat value of liquefied gas is high, and when the same volume of liquefied gas and gas are fully burned, the thermal value of liquefied gas is 20 times that of gas. The second is that it is not toxic, and the liquefied gas contains almost no toxic carbon monoxide. The third is easy to explode, liquefied gas has the disadvantage of easy to explode, in the air mixed with 12.5% carbon monoxide or 4.1% hydrogen, in the event of an open fire will explode, and the air as long as mixed with 2% of liquefied gas, in the event of an open fire will explode. Because of the high thermal value of liquefied gas, the explosion is also destructive. Once the liquefied gas leakage, will quickly gasify and spread outwards, propane, butane, etc. are colorless, odorless gas, after escape is difficult to detect. Therefore, some sulfur ether or thiol with a bad smell is usually added to the liquefied gas, so that it is easy to find the liquefied gas leakage. In case liquefied gas escapes from a fire, put it out with a dry powder fire extinguisher.