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LNG is the abbreviation for Liquefied Natural Gas, which refers to liquefied natural gas. It is a product of natural gas (methane CH4) that has been purified and cooled to ultra-low temperatures (–162°C, 1 atmosphere) to become liquid. Liquefied natural gas has a **reduced volume**; at 0°C and 1 atmosphere of pressure, its volume is about 1/600 of that of gaseous natural gas. In other words, 1 cubic meter of LNG can produce 600 cubic meters of natural gas when it is vaporized. Liquefied natural gas is colorless and odorless. Its main component is methane, with very few other impurities; it is a very clean energy source. Its liquid density is approximately 426 kg/m3, while the gas density at this temperature is about 1.5 kg/m3. The explosion limit is 5%-15% (by volume%), and the ignition point is around 450°C. The natural gas produced from oil/gas fields is formed through liquid removal, acid removal, drying, distillation, and low-temperature condensation, resulting in its volume being reduced to 1/600 of the original amount. With the vigorous progress of China’s \"West-to-East Gas Transmission\" project, a nationwide enthusiasm for natural gas utilization has emerged. As the best energy source in the world today, natural gas has received significant attention in the selection of urban energy sources in our country; promoting its use has become part of our country’s energy policy. However, due to the large scale of projects involved in long-distance pipeline transportation of natural gas, the high costs and long construction periods, it is difficult for such pipelines to reach most cities in a short time. By using high pressure to compress natural gas to about 1/250 of its original volume (CNG) for transportation, and then reducing the pressure, the natural gas supply problem in some cities has been addressed. Compared with the CNG method, the LNG supply approach, which uses ultra-low temperature freezing technology to turn natural gas into a liquid state (with its volume reduced by about 600 times), employs ultra-low temperature insulated tanks for transporting natural gas over long distances via vehicles, trains, ships, etc., stores it in such insulated tanks, and then regasifies it, offers higher transportation efficiency and greater safety and reliability, enabling a better solution to the issue of urban natural gas supply. Characteristics of liquefied natural gas: 1. Low temperature, large gas-liquid expansion ratio, high energy efficiency, and ease of transportation and storage. 1 cubic meter of natural gas contains approximately 9,300 kilocalories of thermal energy. 1 ton of LNG can produce 1,350 cubic meters of natural gas, which is sufficient to generate 8,300 units of electricity. 2. Clean energy — LNG is considered the cleanest fossil fuel on Earth! LNG has an extremely low sulfur content; if all 2.6 million tons per year of LNG were used for power generation, it would result in a reduction of about 450,000 tons of SO2 emissions compared to using coal (lignite), which is roughly equivalent to twice Fujian’s annual SO2 emissions, thereby helping to prevent the further spread of acid rain. The NOX and CO2 emissions from natural gas-powered power plants are only 20% and 50% of those from coal-fired power plants, respectively. High safety performance—due to the excellent physical and chemical properties of LNG! After vaporization, it is lighter than air, colorless, odorless, and non-toxic. High ignition point: the auto-ignition temperature is approximately 450℃ ； Narrow combustion range: 5% – 15% ； Lighter than air, easy to disperse! As an energy source, LNG has the following characteristics: it produces virtually no pollution when burned. The reliability of LNG supply is ensured by the contracts and operations across the entire chain. The safety of LNG is fully ensured by strictly adhering to a series of international standards throughout the design, construction, and production processes. LNG has been in operation for 30 years without any serious accidents. Using LNG as fuel in power plants helps with peak load management in the power grid, ensures its safe operation and optimization, and improves the structure of the power supply. As an urban energy source, LNG can **improve the stability, safety, and cost-effectiveness of gas supply. Widespread use of LNG: As a clean fuel, LNG is bound to become one of the main energy sources in the new century. In summary, its main applications include: serving as a peak-load and emergency backup source for gas supply in urban pipeline networks; acting as the primary gas source for pipeline gas supply in large and medium-sized cities; serving as a gas source for LNG vaporization in residential areas; being used as fuel for vehicle refueling; being utilized as aircraft fuel; utilizing the cold energy of LNG; and being applied in distributed energy systems