Common combustion modes of boiler burner

Common combustion modes of boiler burner
At present, natural gas boilers are widely used and have become the focus of energy-saving and environmental protection transformation in the thermal industry. Do you know how the burner of your gas-fired boiler burns? Today we are going to talk about the combustion mode of gas boiler burner.
1. Diffusion combustion.
The diffusion combustion mode is not to premix, but to diffuse the gas at the nozzle mouth and then burn it.
Advantages: this combustion method does not carry out premixing, its combustion method is relatively simple, and the flame is relatively stable.
Disadvantages: due to the long flame, incomplete combustion is very easy to occur, which will produce a large amount of carbon monoxide and nitrogen oxides, which is not conducive to the full use of boiler fuel and the improvement of boiler thermal efficiency, and is difficult to meet the boiler emission standards.
2. Full premixed combustion mode.
Full premixed combustion means that natural gas is mixed with air before combustion, and then enters the burner for mixed combustion.
Advantages: air and gas are premixed, multi-radiator heat transfer mode is adopted, and heat transfer intensity is improved. The advantages of this combustion method are that the combustion flame is clearer and the thermal efficiency is higher.
Disadvantages: combustion premix ratio requires accurate combustion speed, uniform combustion, and full radiation heat transfer.
3. Flameless combustion.
In the combustion chamber, the combustion method of uniform mixing of pre-combustion space and gas furnace is adopted. When using this method, the oxygen required for gas combustion does not need to be obtained from the surrounding air, and combustion can be completed immediately as long as the mixture with air reaches the combustion zone.
Advantages: flameless combustion is a mild combustion mode under the condition of low oxygen dilution, which is characterized by low reaction rate, less local heat release, uniform heat flow distribution, small temperature difference in the furnace, low combustion peak temperature, low noise and low NOX generation.