Compressed Natural Gas (CNG) | Composition, Advantages & Disadvantages

By | April 21, 2018

What is Compressed Natural Gas?

Natural gas is a fossil fuel and is usually formed in the Earth along with petroleum. Its main constituent is methane. It also contains small quantities of Ethane and Propane.

Natural Gas is liquefied by applying high pressure to CNG. In automobiles, houses and factories, CNG is used as a fuel. It is also used as a source of hydrogen required in the manufacture of fertilizers.

Composition of CNG

Compressed Natural Gas is generally a mixture of the lighter hydrocarbons with methane (CH4) predominating, often with varying fractions of nitrogen and impurities such as hydrogen sulfide.

Applications of CNG

  1. It is used in Power generation
  2. It is taken in Domestic use
  3. It is used in Transportation sector
  4. It is also used in manufacturing of Fertilizers

Advantages of CNG

  1. It has Octane number around 110, which makes it an excellent SI (spark ignition) engine fuel. Because of high octane number flame speed is higher and it can operate with high compression ratios.
  2. It has Low engine emissions. Low aldehyde emission than alcohols (read use of alcohol as a fuel).
  3. It is fairly abundant in nature and also can be obtained from coal.
  4. It’s environmentally friendly
  5. It is Safer and easier to store, by far
  6. It is reliable
  7. It’s less costly compared to other fossil fuel energy sources
  8. It Minimizes dependency on foreign oil

Disadvantages of CNG

  1. Its low energy density results in low engine performance
  2. It has Low engine volumetric efficiency because of gaseous fuel
  3. It Needs Large storage tanks, which is a safety concern
  4. It has Inconsistent fuel properties
  5. Its Refueling is a slow process
  6. It’s highly combustible
  7. It is Non-renewable energy source
  8. It emits some quantities of greenhouse gas

Also read:

Comparison between SI and CI engines

What are reciprocating internal combustion engines?

What are heat engines?

Featured Image source:

Page URL: https://commons.wikimedia.org/wiki/File:Loveland_FLEX_CNG_powered_bus.jpg

File URL: https://upload.wikimedia.org/wikipedia/commons/7/73/Loveland_FLEX_CNG_powered_bus.jpg

Attribution: Greg Goebel [Public domain], via Wikimedia Commons [Date: 09-12-2018]

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.