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 compressing it. 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.
  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 quantity of greenhouse gases

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