BOILER BURNER

           

Combustion of Fuel in Furnace and Burner Design Process

The heat producing constituents of the fuel are hydrogen, carbon and sulphur. The calorific value of the combustion processes measured in mega joules for each Kg of fuel burnt:

Carbon to carbon dioxide - 34

Hydrogen to water - 120.5 (assuming the water vapor is not allowed to condense)

Sulphur to sulphur dioxide - 9.3

The main cause of heat loss with the process is that taken away by nitrogen. Therefore, to achieve maximum efficiency the excess air should be kept to a minimum. However, there is a limit to the reduction in the excess air in that the combustion process must be fully completed within the furnace and within a finite time.

The main type of combustion process is called the suspended flame.

The flame front remains in the same position relative to the burner and swirl.

The fuel particles pass through the flame completing their combustion process and exiting at the same rate as the fuel enters.