Combustion Engineering
Summary :
a-Combustion :
For the combustion of 1Kg fuel a certain amount of oxygen is required .
b-Kiln gas :
The kiln gas consists of :
1-Combustion products .
2-Excess air of combustion .
3-False air .
4-Gas from raw meal .
c-Analysis of kiln gases :
The orsat-analysis is used to analyze the dry kiln gases , from orsat-analysis we get :
1-Excess air factor ( n ) .
2-Incomplete combustion .
3-Heat consumption .
4-False air .
Combustion
A-Fuel :
We have three types of fuels :
a-Gaseous fuels .
b-Liquid fuels .
c-Solid fuels .
The combustible elements that characterize fuels are carbon , hydrogen and sulfer .The complete combustion of carbon gives carbon dioxide and hydrogen gives water .The products of complete combustion of fuel are CO2 ,H2O ,N2 and O2 .The presence of CO indicates incomplete combustion .
B- Heat of combustion :
Chemical change is accompanied by absorption of heat .Heat values that generated when 1Kg of fuel is completely burned .
Purpose Of The Gas Analysis
The knowledge of the gas composition in a cement plant is important to control the firing of kiln .The following points can be determined :
1-How complete the combustion of fuel .
2-How much excess air .
3-False air .
4-Specific consumption .