How does LNG maintain low temperatures?
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According to the information available on LNG, it is stored at -162°C. How is this temperature maintained? Even in insulated storage tanks, heat is generated; as the temperature rises, the LNG vaporizes and the pressure increases, requiring venting. It’s manageable when gas is being used continuously, but when it’s not in use, ventilation must take place periodically, just like with liquid nitrogen. Venting is also necessary during filling. Just let it exhaust automatically when ventilation is needed, just like with liquid nitrogen? Is the same thing true for LNG fuel used in vehicles? When drivers wait for the vehicle to set off and smoke below it, isn’t that playing with fire?
200-liter liquid-phase cylinders that have been used with LNG do indeed require regular pressure relief, which is achieved through a self-standing pressure relief valve located on the top of the cylinder.
Therefore, LNG is more suitable for vehicles that run daily such as trucks and buses. The volatile gases are called BOG, and they must be recovered during filling. Well-insulated gas cylinders also have good pressure-bearing capacity with minimal loss.
Therefore, LNG is more suitable for vehicles that run daily such as trucks and buses. The volatile gases are called BOG, and they must be recovered during filling. Well-insulated gas cylinders also have good pressure-bearing capacity with minimal loss.
Following the hints on the 3rd floor, I found information related to BOG as well as some details about LNG: http://yeslng.com/p/5551
The vehicles are equipped with CNG, right? LNG is used at filling stations for refueling; it needs to exchange heat with refrigerants such as nitrogen, ethylene, isopentane, and methane, until it is finally cooled down
"What is the specific process for heat exchange using refrigerants such as nitrogen, ethylene, isopentane, and methane?