Briefly Describe the Combustion Process of Gas Fuel
Briefly Describe the Combustion Process of Gas Fuel
In terms of chemical reaction kinetics of fuel combustion, the combustion of gaseous fuels can be divided into two categories: diffusion combustion and premixed combustion.
If the fuel and combustion-supporting air are supplied separately and mixed and burned after entering the combustion furnace, no matter how the mixing is intensified, the diffusion time between the fuel gas and combustion-supporting air is still much longer than the chemical reaction time, so the combustion at this time belongs to diffusion combustion. Industrial combustion belongs to diffusion combustion.
If the fuel gas is mixed with all combustion-supporting air in advance, and after a period of time, the balance between the two has been achieved through full diffusion, and the diffusion time is zero, no matter how fast the chemical reaction proceeds, it is also the main factor determining the whole time, so it is said to be power system. Because the power burn around needs to combine the fuel gas with the auxiliary air in advance, it is usually called premixed combustion.
The normal combustion process of all combustible mixtures has two stages ignition and nuclear combustion itself, that is, combustion can only be carried out after ignition.