Module 7: Combustion and Environment
  Lecture 37: Major Sources of CO Emission
 


Chemicals From Combustion (Contd..)

Emission of Hydrocarbon

  • Non-methane hydrocarbons (NMHC) are short lived and highly reactive.
  • Oxidization of these hydrocarbons leads to the formation of .
  • Volatile organic compounds include NMHC as well as oxygenated species such as aldehydes and alcohols.
  • These are mainly contributed by gasoline vehicles, solvent evaporation and biomass burning.
  • These bio-organic hydrocarbons are quite reactive and are usually destroyed within the boundary layer.

Emission of Sulphur Dioxide and Sulphate Aerosols

  • Sulphur content of fossil fuels such as coal and oil is in the range of 0.5 – 2.5 by mass.
  • Sulphur in the fossil fuel is usually emitted as and leads to the formation of sulphuric acid.
  • takes very less time to get converted into sulphate to wet or dry deposition on the earth surface.
  • Combustion of fossil fuels contributes significant amount of in troposphere, which is about 80 Mt/yr.
   

Source

SO2 (Million tons per year)

Fossil fuel

80

Metal smelting

8

Biomass burning

2

Natural sources (Ocean, oil, vegetables)

25