Views:1 Author:Site Editor Publish Time: 2021-09-10 Origin:Site
CNG (Compressed natural gas) is the English abbreviation for compressed natural gas, which is mainly used for short-distance vehicles and suburban communities. Common vehicle-mounted CNG is stored in high-strength storage tanks, and the storage pressure of natural gas is 20 MPa. Due to this high-pressure compression scheme, the gas storage rate is not high, and the quality of the stored compressed natural gas is only 1/5 to 1/10 of the quality of the storage tank itself, and it will bring certain hidden dangers to driving safety, and its use has greater The limitations.
LNG (Liquefied natural gas) is a low-temperature liquid fuel that can be stored and transported under normal pressure. Under atmospheric pressure, the boiling point of liquefied natural gas is -160℃, and its volume is reduced to 1/600 of its original size, which is equivalent to natural gas being compressed at a pressure above 60 MPa, thereby increasing the energy density; in addition, the unit mass of liquefied natural gas is only that of gasoline Half, the unit calorific value is 12% higher than that of gasoline, so the gas supply efficiency of the on-board fuel system is improved, and the effective fuel carried will be 2 to 3 times higher than that of the compressed gas tank-type natural gas refueling vehicle. At the same time, the size and mass of the fuel system are reduced, and the effective load of the vehicle and the continuous driving range after one refueling are increased. As the number of refills is reduced, the time for the car to go to and from the refueling station is also reduced, thereby reducing the operating cost of the car and increasing the profitability of the car owner.
LPG (Liquefied petroleum gas) is a kind of colorless and volatile gas obtained by pressurizing, cooling and liquefying refinery gas or natural gas (including oilfield associated gas). The main components of liquefied petroleum gas obtained from refinery gas are propane, propylene, butane, butene, and a small amount of pentane, pentene and trace sulfur compound impurities; while the composition of liquefied petroleum gas obtained from natural gas basically does not contain olefins . Liquefied petroleum gas is mainly used as a raw material for petrochemicals, used for hydrocarbon cracking to produce ethylene or steam reforming to produce synthesis gas, and can be used as industrial, civil, and internal combustion engine fuel.