Tuesday, December 23, 2008

What is NGV ?

NGV Diagram



What is natural gas?

Natural gas is a mixture of hydrocarbons found in the ground independently or together with crude oil. Its composition varies (depending on where it is found), but its main component is “Methane”(CH4}. The rest of the gas is made up of varying amounts of other gases like ethane, propane, butane, and heavier hydrocarbons, plus Carbon Dioxide, Nitrogen, water and traces of other substances. Natural gas is a by-product of decaying vegetable matter in underground strata. Natural gas is the cleanest burning fossil fuel; it can help improve the quality of air and water,especially when used in highly polluted places.Malaysia is blessed with abundant natural gas reserves. At 82.5 trillion cubic feet, these reserves are two times the amount of oil, thus there is opportunity to promote and diversify the use of the natural gas not just as a power source in the industrial and utilities sector; but also as an alternative fuel for vehicles. PETRONAS, through its wholly, owned subsidiary, PETRONAS NGV Sdn Bhd , have been making NGV available to Malaysian motorists through its expanding chain of NGV outlets in the Klang Valley and other major urban areas in the country.




What is NGV ?

NGV stands for Natural Gas Vehicle. They operate similarly to traditional vehicles, but they use natural gas as fuel. Natural gas can power existing cars and trucks by converting the engines to a bi-fuel capability. To convert vehicles to natural gas requires installing a tank, fuel pressure regulators, and fuel lines. Most systems incorporate an electronic module which adjusts the engine to maintain comparable performance levels with either fuel. Limited production of dedicated natural gas engines and vehicles is under way at motor vehicle manufacturers. Refueling stations use the same natural gas as commercial facilities and residences. These stations now provide compressed natural gas for quick-fill




How a Natural Gas Vehicle Work ?
1. Natural gas is compressed and enters the vehicle through the natural gas fill valve (receptacle).


2. It flows into high-pressure cylinders located in or under the vehicle.


3. In a bi-fuel NGV, a fuel selector on the dashboard permits selection of natural gas or gasoline to act as the fuel for the vehicle. A dedicated NGV operates solely on natural gas.


4. When natural gas is needed by the engine, it leaves the cylinders and passes through the master manual shut-off valve.


5. The gas goes through the high-pressure fuel line and enters the engine compartment.


6. Gas enters the regulator, which reduces pressure from up to 3,600 psi to near atmospheric pressure.


7. The natural gas solenoid valve allows natural gas to pass from the regulator into the gas mixer or natural gas fuel injectors. (Or, it shuts off the natural gas when the engine is not running or when, in the case of a bi-fuel vehicle, gasoline is selected).


8. In a bi-fuel NGV, natural gas mixed with air flows down through the gasoline carburetor or fuel injection system and enters the engine’s combustion chambers. In a dedicated NGV, natural gas is injected into the engine’s combustion chamber via specially designed natural gas fuel injectors.


9. In a bi-fuel NGV, when the driver selects gasoline, the conventional gasoline system is activated and the natural gas system is automatically shut off.


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