Importance of combustion in boiler operation and performance.
combustion is the process of releasing the heat in the fuel with the help of oxygen available in the air to produce steam for process and power requirements of a process industry. there are many fuels available in the form of solid, liquid and gas. In any fuel the percentage of available carbon is counted for combustion in the boiler furnace.
carbon + oxygen = carbon di oxide
C+O2=CO2 ,molecular weight of carbon is12 and that of oxygen is 16
there fore, we have
12+2×16= 12+32= 44
12 ÷12 + 32÷12= 44÷12
1+8÷3 =11÷3
1+2.67=3.67
That is one kg of carbon requires 2.67 kg of oxygen for sticometric combustion of fuel. but in practical sticometric ratio of fuel to air will not provide complete combustion. therefore such amount of excess air is always necessary to achieve complete combustion of fuel.
1 kg of air consists 0.23 kg of oxygen. therefore for 2.67 kg of oxygen will require
2.67÷0.23 =11.61kg of air. for burning 1 kg of carbon we require 11.67 kg of air for combustion. other than carbon the fuel will consist of hydrogen, sulphur and other organic materials in some small quantities as such air is required for burning those components as well. apart from this some quantity of excess air ranging from 10%to 50% be required additionally. so the F.D fan must designed for this requirement of air for smooth and proper combustion of fuel in the furnace. the furnace grate area is also must have sufficient to burn this much quantity of fuel. by having sufficient fan capacities and furnace area the combustion will be proper and the performance of boiler operation will be quite good.
for further information one can always be contacted by email or phone given below.
K GOPALAN.
kgopalan1956@gmail.com
9420663740/9108956202.
