Classification of natural gas

Gas classification

Urban gas refers to the combustible gas from the regional gas source point in the city, town or residential area, through the transmission and distribution system to the residential life, commercial, industrial enterprise production, heating, ventilation and air conditioning and other users of common nature, and in line with the "urban gas design Code" gas quality requirements.

Town gas is a mixture of a variety of gases, including combustible gas and non-combustible gas. Among them, the combustible gases are carbon oxides (such as methane, ethane, ethylene, propylene, propane, butane, butene and other combustible gases), hydrogen and carbon monoxide, and the non-flammable gases are carbon dioxide, nitrogen and oxygen.

According to the causes, urban gas can be summarized into three categories: natural gas, artificial gas and liquefied petroleum gas. Among them, natural gas is naturally generated, artificial gas is converted from other energy sources, or a byproduct of the production of other products, liquefied petroleum gas is a byproduct of petroleum processing.

1. Natural gas: A gaseous fossil fuel composed mainly of methane, mainly in oil and gas fields, but also a small amount in coal seams.

Compressed natural gas is a gas that uses the compressibility of gas to store conventional natural gas under high pressure, and its storage pressure is usually 20-25Mpa, and natural gas can be compressed to 1/200-1/250 of the original volume, which greatly reduces the storage volume.

Liquefied natural gas is the liquid form of natural gas, which makes full use of the nature of natural gas liquefaction at atmospheric pressure, -162 degrees Celsius, and the volume is reduced to 1/600 of the original, providing a new way for the efficient transportation of natural gas, and also expanding the use of natural gas.

2. Artificial gas: gas produced by the process of dry distillation, gasification or cracking of solid fuels such as coal and coke or liquid fuels such as heavy oil. According to the production method, artificial gas can generally be divided into dry distillation gas and gasification gas.

3. Liquefied petroleum gas: gas derived from petroleum processing or petroleum and natural gas extraction, the main components of which are propane, propylene, butane, butene.