LNG is widely used in advanced countries of environmental protection in the world. In addition to being used as fuel for power plants, factories and household users, the methane contained in it can be used as chemical raw materials such as fertilizer, methanol solvent and synthetic acetic acid; In addition, ethane and propane contained in it can be cracked to produce ethylene and propylene, which is an important raw material for plastic products. In addition, during the transformation of ultra-low temperature LNG into normal temperature gas under atmospheric pressure, it can provide a large amount of cold energy, which can also be used for six low-temperature purposes: separating air to produce liquid oxygen and liquid nitrogen, liquefying carbon dioxide and dry ice, generating electricity by using cold energy, manufacturing frozen food or used in frozen warehouse, rubber, plastic, plastic, etc Low temperature crushing treatment of industrial wastes such as iron filings and seawater desalination. In the face of increasingly serious ecological environment pollution, in order to optimize the energy consumption structure, improve the atmospheric environment, and realize the economic development strategy of sustainable development, people choose natural gas as a clean and efficient ecological high-quality energy and fuel. Now, both industry and civil use are increasingly dependent on natural gas. Liquefied natural gas (LNG) is the liquid form of natural gas. In some cases, choosing LNG has more advantages than choosing gaseous natural gas. The application of LNG is actually the application of natural gas, but because of its characteristics, LNG has more extensive uses than natural gas.