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Because LNG is beneficial to ecological protection, especially in industrial centers and densely populated areas, the use of LNG is more advantageous. At present, countries with advanced environmental protection in the world are promoting the use of LNG. LNG is mainly used in the following aspects.
(1) Solve the energy supply in remote areas
LNG can be transported to remote energy consumption places far away from natural gas fields by ground or water transportation, thereby replacing underground long-distance pipeline transportation and saving a lot of investment in pipeline and station construction.
(2) Solve the development of remote gas fields or natural gas recovery
The use of LNG can effectively solve the development of remote gas fields such as remote seas and desert areas and their natural gas recovery.
(3) Natural gas peak regulation
Due to seasonal or daily gas consumption fluctuations of civil users, maintenance or renovation of industrial users or the LNG plant itself, and failure of the gas pipeline network, regular or irregular gas supply will be unbalanced. The construction of LNG storage tanks can effectively cut peaks. Fill the valley. For peak load LNG plants, they are generally built near users to regulate industrial and residential natural gas.
The unbalanced load ensures the safety and stability of the gas supply.
(4) LNG cold energy recovery and utilization
LNG carries about 836J/kg of cold energy at normal temperature, which can not only be used to liquefy and separate air to produce liquid oxygen, liquid nitrogen or dry ice, but also can be used for power generation, refrigerated frozen goods, cryogenic crushing and processing industries waste, desalinated seawater, etc. For this reason, some peak shaving devices are often built in conjunction with refrigeration plants. In addition, the boiling gas of the LNG storage tank can also be recovered nearby. At present, the recovery rate of LNG cold energy can reach more than 50%.
(5) Production of LNG by-products At different stages in the LNG production process, C2, C3, C4, C5, C5+ hydrocarbons, H2S, H2 and other chemical raw materials and fuels can be separated. Because the liquefaction temperature of helium (He) is -269 ℃, when the temperature drops to -162℃, all natural gas will be liquefied into LNG, so LNG and helium (He) can be co-produced, which not only saves investment, reduces operating costs, but also improves the operating flexibility of the device.
(6) LNG is used as fuel
Natural gas removes harmful components such as acid gas, heavy hydrocarbons, water, and mercury before liquefaction. In addition to being used as fuel for power plants, factories, and household users, methane can also be used to make chemical products such as fertilizers, methanol solvents, and synthetic acetic acid. , while ethane and propane can be cracked to produce plastic raw materials such as ethylene and propylene. Therefore, LNG is a high-quality chemical raw material and civil fuel.
