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Chemicals are closely related to life----the use of gas

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Chemicals are closely related to life----the use of gas

LPG refers to petroleum gas liquefied by high pressure or low temperature, referred to as "liquefied petroleum gas" or "liquefied gas". The composition is propane, n-butane, isobutane and a small amount of ethane, an organic compound larger than carbon 5, an unsaturated hydrocarbon, and the like. LPG has the characteristics of flammability, explosiveness, gasification, thermal expansion, retention, chargeability, corrosion and suffocation.

LPG is mainly composed of propane (C3H8) and butane (C4H10), and some LPG also contains propylene (C3H6) and butene (C4H8). LPG is generally obtained from oil and gas fields, oil refineries or ethylene plants. Compared with other fuels, LPG has the following unique advantages.

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(1) less pollution

LPG is a hydrocarbon composed of C3 (carbon three) and C4 (carbon four), which can be completely burned without dust. Application in modern cities can greatly reduce the pollution caused by coal and diesel fuel in the past.

(2) high calorific value

The same weight LPG has a calorific value equivalent to twice that of coal and a liquid calorific value of 45 185 to 45 980 kJ/kg.

(3) easy to transport

LPG is a gas at normal temperature and pressure. It can be liquefied into liquid under a certain pressure or frozen to a certain temperature. It can be transported on land and water by train (or car) tanker and LPG ship.

(4) pressure stability

The LPG pipe user has the same pressure before the stove, and the user is convenient to use.

(5) simple storage and flexible supply

Compared with the production, storage and supply of city gas, LPG's storage equipment is relatively simple. The gas station is stored in LPG storage tanks, and can be installed in gas cylinders for users to use, or through gas distribution stations and supply pipe networks. Pipeline gas supply is implemented; even butane gas can be used in small bottles to be used as hot pot fuel on the table, which is convenient to use.

Because of its advantages, it is widely used in civil fuels, but it is inevitably highly dangerous.

The first and most characteristic feature of liquefied petroleum gas is the explosive nature of liquefied petroleum gas. Generally, when a liquefied petroleum gas safety accident occurs, an explosion will occur and it will explode before burning. The main reason is because the calorific value of liquefied petroleum gas is relatively high. It is several times higher than the calorific value of ordinary gas to compare liquefied petroleum gas from the calorific value, so it will appear when there is a safety accident in liquefied petroleum gas. The situation of the explosion. Combustion occurs after the explosion, and the burning of liquefied petroleum gas is similar to the power of the explosion and is highly destructive.

(6) flammability of liquefied petroleum gas

Liquefied petroleum gas has the main components of petroleum. These components include propane, butane, propylene, butene, etc. The components are typical hydrocarbon compounds, and the largest characteristic of hydrocarbon compounds is flammability. Moreover, the flash point and the self-ignition point of these hydrocarbon compounds contained in the liquefied petroleum gas component are very low, and it is easy to cause combustion.

(7) toxicity of liquefied petroleum gas

Liquefied petroleum gas is a toxic gas, but the volatilization of this toxicity is conditional. Only when the concentration of liquefied petroleum gas in the air exceeds 10% will the toxicity of the reaction occur. When the human body is exposed to such toxicity, it will cause vomiting, nausea or even coma, which will cause great harm to the human body.

(8) the flowability of liquefied petroleum gas

Liquefied petroleum gas is very easy to flow, and in the event of a leak, liquefied petroleum gas will flow out of the reservoir. In general, 1 liter of liquefied petroleum gas will volatilize into about 350 liters of gas after flowing out. These gases will burn when they encounter electricity, causing a serious fire.

Therefore, pay attention to the use of security.


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