Advantages of LNG

Compared to LPG and CNG, the advantages of LNG as a substitute fuel for vehicles are as follows:

(1) Clean and Eco-friendly. As a fuel for vehicles, LNG must first be vaporized by a vaporizer and then enter the engine in a gaseous state for complete combustion. Due to the high methane content of 90% to 99% in the composition of LNG, the exhaust contains very low levels of harmful substances, making it highly clean and eco-friendly.

(2) High calorific value per unit price. Compared to other fuels, LNG offers a lower price and higher calorific value per unit. The low-temperature characteristics of LNG can reduce the temperature of the mixed gas and the combustion temperature, thereby improving the engine's thermal efficiency. This effectively ensures that LNG burns more completely and thoroughly in the engine than LPG, CNG, diesel, and gasoline. Additionally, with its high energy density and high storage efficiency, LNG is more advantageous for transportation and has a wider geographical application range. Therefore, LNG boasts strong economic and practicality.

(3) High safety. LNG fuel tanks allow working pressures up to 1.586 MPa, with the factory-set operating pressure range for natural gas being 0.1759 to 1.4074 MPa. The advantages of natural gas, such as a lower likelihood of danger compared to CNG, are notable. Automotive LNG tanks commonly use double-layer metal vacuum powder insulation or double-layer metal vacuum wrapped insulation structures, which offer high thermal insulation efficiency and can maintain a longer period without venting. After gasification, LNG has a lower density than air under normal pressure, so even in the event of a leak, it will quickly disperse into the air. The risk of spontaneous combustion is low. Additionally, the composition of LNG is relatively stable, with its simplicity and consistency being beneficial for determining design parameters such as engine compression ratio, which helps avoid the adverse effects of explosive combustion of components like ethane and propane. As a substitute fuel for vehicles, LNG ensures smooth engine operation, reduces noise pollution, and can save over 50% on engine maintenance costs compared to conventional fuels.