CNG – Compressed Natural Gas
Compressed natural gas, or CNG, is a natural gas under pressure. It is clear, odorless, and non-corrosive. During combustion, CNG produces lesser number of undesirable gases than other fuels. It is safer to use and store than other fuels because natural gas is lighter than air and disperses quickly when released. In nature, CNG can be obtained from the surface above the oil deposits or may be collected from landfills or wastewater treatment plants, where it is known as biogas. CNG majorly has methane (CH4) as its primary component.
CNG may be obtained by compressing natural gas to less than 1 percent of the volume it occupies at standard atmospheric pressure. The storage and distribution of CNG are done in hard containers at a pressure of 20–25 MPa (2,900–3,600 psi) which are generally in cylindrical or spherical shapes. CNG is widely used as alternate fuel to drive automobiles. It has decreased our dependency on conventional fuels such as petrol and diesel. When CNG reaches the combustion chamber, it mixes with air. A spark plug used for igniting the fuel. The energy released from the explosion moves the vehicle. Although vehicles can use natural gas as either a liquid or a gas, most vehicles use the gaseous form compressed to 3,000 psi.