1. What is CNG?
Compressed Natural Gas (CNG) is like a "portable version" of natural gas. By compressing pipeline gas to 200-250 atmospheres (equal to water pressure at 2,000m depth), its volume shrinks to 1/200th, making it storable in vehicle cylinders.
Fun Fact:
1m³ CNG ≈ 1.3L gasoline energy
Buses using CNG reduce PM2.5 by 96%
2. How CNG is Made?
a. Sulfur "Bath"
Gas passes through amine scrubbers to remove H₂S (the rotten egg smell compound).
b. Deep "Dehydration"
Molecular sieves dry gas to -40℃ dew point (10x drier than desert air).
c. High-pressure "Diet"
Multi-stage compressors gradually increase pressure to 25MPa (250kg force on a fingernail-sized area).
3. CNG's Green Advantages
20-30% less CO₂ than gasoline
60% fuel cost vs gasoline in China
Safety: CNG tank explosion energy = 1/25th of gasoline
DO YOU KNOW?
Why are CNG vehicle cylinders always cylindrical?
Cylindrical shape evenly distributes pressure, avoiding stress concentration at corners - just lik3e how egg shapes are naturally strong!
