II. Simple Chemical Combustion – why do differing amounts of air and inlet condi
ID: 961969 • Letter: I
Question
II. Simple Chemical Combustion – why do differing amounts of air and inlet conditions play a role in the overall result of combustion. Key results were the heat liberated by combustion and the maximum temperature of combustion, discuss this briefly.
IV. Chemical Kinetics gives us perhaps hundreds of reactions, many of which are very short timeframe, but the ultimate outcome may be said to be the same as II above. Similarly, the main polluting components, NOx and SOx, may be said to have an ultimate outcome in the appropriate acid. Above we said time is a factor, in controlling pollution, why might this be so (in terms of energy conversion rate)?
Explanation / Answer
a) The amount of air is the air required to completely burn the fuel sample.
The air is suppled in excess to ensure the proper burning of fuel
A fan is used to move proper amount of volume of air in the burner, which is affected by the temperature and pressure.
If we use excess of excess of air required for combustion of fuel then it will cause wastage of fuel and hence wastage of heat.
By the use of modulators we can control the air and fuel supply in the burner which ensures that significant and required amount of heat is being added so that optimum temperature and pressure is maintained. This also controls the heat absroption in a given time.
If excess of excess air is used then it may results in increase stack temperature which decreases the effeciency of the burner.
IV) Reference text is missing.