Constituents of CNG (Compressed Natural Gas):
It mainly consists of methane compressed at a pressure of 200-248 bar.
Constituents of LPG (Liquefied Petroleum Gas): It contains a mixture of propane and butane liquefied at 15°C and a pressure of 1.7 – 7.5 bar.
Advantages of CNG over LPG:
- CNG is cheaper and cleaner than LPG.
- CNG produces less pollutants than LPG.
- It does not evolve gases containing sulphur and nitrogen.
- Octane rating of CNG is high, hence thermal efficiency is more.
- Vehicles powered by CNG produces less carbon monoxide and hydrocarbon emission.
