1. What is CNG?
CNG (Compressed Natural Gas) with the main composition of methane (CH4 ~ 95%), is compressed at the high pressure and transported by specialized trailer.
CNG (Compressed Natural Gas) is natural gas colorless, odorless, non-toxic and lighter than the air.
2. Benefits of CNG (Compressed Natural Gas)
|ENVIRONMENT BENEFITS||SAFETY BENEFITS||ECONOMICAL BENEFITS||TECHNICAL BENEFITS|
Compressed natural gas (CNG) is one of the cleanest burning fuels on the market today. CNG burns cleaner than petroleum products because of its lower carbon footprint (it is estimated that when using CNG as a fuel, it helps to reduce CO by 90%; reduce from 75% to 95% by NOx; reduce by 25% CO2).
Being an odorless, non-toxic gas, in the unfortunate event of a coincidence, CNG does not emit as many harmful emissions as gasoline or diesel. Since CNG is lighter than air, in the event of a leak, it just rises and disperses into the atmosphere and into the air easily and evenly.
CNG is less likely to spontaneously ignite on hot surfaces, as it has a high auto-ignition temperature (about 540 degrees Celsius) and a narrow ignitability range (5% -15%). That is, if the concentration of CNG in the air fluctuates below 5% or above 15%, it will not burn. It is this high ignition temperature and limited ignition range that makes spontaneous self-ignition or accidental combustion very unlikely.
The cost of CNG is about 10-30% cheaper than gasoline, in addition, the cost of cars using CNG natural gas is nearly 40% lower than that of gasoline or diesel cars. The price of CNG is stable in the long run compared to the price of petroleum products.
CNG is lighter than air, so it spreads easily and doesn’t accumulate as much as gasoline vapor. Because the combustion process occurs completely, without causing deposits in the combustion equipment and carburetors of vehicles, CNG helps to improve efficiency, prolong maintenance cycles and equipment life.
3. Some basic technical characteristics of CNG (Compressed natural gas)
|Relative density||Water = 1||0.74||0.84||0.55||_|
|Relative density||Air = 1||_||_||1.285||0.64|
|Auto – iginition|
|Temperature||Degree C (°C)||360||280||374||540|
|Flammability Range||% in Air||1 – 8||0.6 – 5.5||2.2 – 9.0||5 – 15|
|Flame Temperature||Degree C (°C)||2030||1780||1983||1954|
Table: Some basic technical characteristics of Petrol, Diesel, LPG and CNG
Note: Octane Number is a standard measure of a fuel’s ability to withstand compression in an internal combustion engine without detonating. The higher the octane number, the more compression the fuel can withstand before detonating