Liquefied Natural Gas (LNG), whose main component is methane, is recognized as the cleanest fossil energy on earth. It is colorless, odorless, non-toxic and non-corrosive. Its volume is about 1/625 of the volume of the same amount of gaseous natural gas, and the mass of liquefied natural gas is only about 45% of the same volume of water.
The manufacturing process is to first purify the natural gas produced in the gas field, after a series of ultra-low temperature liquefaction, and then transport it by liquefied natural gas ships. After being burned, LNG has very little air pollution and emits a lot of heat, so LNG is a relatively advanced energy source.
Liquefied natural gas is natural gas that is compressed and cooled to its freezing point (-161.5°C) and then becomes liquid. Usually, LNG is stored in a low-temperature storage tank at -161.5°C and 0.1MPa or so. Its main component is methane, which is transported by special ships or tankers and re-gasified when used. Since the 1970s, the world's LNG production and trade volume have increased rapidly. In 2005, the international LNG trade volume reached 188.81 billion cubic meters. The largest exporter was Indonesia with 31.46 billion cubic meters; the largest importer was Japan 76.32 billion cubic meters.
