12-12-2012, 12:42 PM
Emission Controls
Emission Controls[1] (1).ppt (Size: 335 KB / Downloads: 122)
Before beginning to understand emission controls you should know the reason why emission controls were installed into the automobile.
1. To reduce the amount of pollutants entering the atmosphere .
Smog is a term developed from smoke and fog
Smog is form when airborne pollutants is formed with oxygen and other atmospheric gasses to produce a grayish yellow smoke. The resulting smoke is called photochemical smog.
Smog
Smog is can be a major problem in larger cities (New York and LA)
Smog can be harmful to
A. Humans
B. Plants
C. Animals and even effect paint rubber and other materials.
Motor Vehicle Emissions
Motor vehicle emission are emission produce by motor vehicles. They include
A. Hydrocarbons (HC)
Carbon monoxide (CO)
Oxides of nitrogen (NOx)
Exhaust Gasses
Hydrocarbons (HC) are emission of unburned petroleum products being released into the atmosphere.
All petroleum products and made of hydrocarbons (hydrogen and carbon compounds) this includes:
Gasoline LP-gas.
Diesel motor oil.
Hydrocarbons are produced because of incomplete fuel combustion or fuel evaporation.
Hydrocarbons emission is considered a hazardous form of air pollution because of.
Eye.
Throat.
Lung irritation.
And possibility cancer.
Carbon monoxide emission are exhaust emission that is the result of partially burned fuel.
A high carbon monoxide emission can be caused by a:
Restricted or dirty air cleaner.
Advance ignition timing.
Clogged fuel injectors.
Oxides of nitrogen, (NOx) are emission produced by extreme heat.
Air consist of approximately 79% nitrogen and 21% oxygen
When combustion chamber temperature reaches 2500 degrees F or 1370 degrees C nitrogen and oxygen combine to produce oxide of nitrogen (NOx)