How to effectively reduce pollutant emissions in fully premixed low nitrogen combustion

How to effectively reduce pollutant emissions in fully premixed low nitrogen combustionHlyBoiler Burner
1) Full premixed combustion reduces nitrogen oxide emissionsHlyBoiler Burner
Firstly, fully premixed combustion does not produce fuel type nitrogen oxides; Secondly, fully premixed combustion does not produce rapid nitrogen oxides; Then, full premixed combustion reduces the concentration of nitrogen oxides generated.HlyBoiler Burner
2) Full premixed combustion reduces CO concentrationHlyBoiler Burner
According to the mechanism of CO generation, CO is an intermediate product produced by the oxidation of carbon containing fuel. The initial carbon contained in the fuel will be first oxidized to CO, and then further oxidized to CO2. Experimental results have shown that at flame temperature, if there is sufficient oxygen and residence time, the concentration of CO will decrease to a very low level after the reaction. Due to the uniform mixing of gas and excess air before combustion, fully premixed combustion can greatly ensure the presence of sufficient oxygen molecules around each gas molecule. Therefore, the CO emission concentration of fully premixed combustion is very low.HlyBoiler Burner
The condensing gas wall mounted boiler adopts a fully premixed burnerHlyBoiler Burner
At present, the fully premixed burners used on condensing wall mounted boilers are all blast type fully premixed burners, mainly including flat, hemispherical, and cylindrical, as shown in the following figure, with cylindrical burners being the most commonly used. Practice has shown that cylindrical and hemispherical surfaces are easier to form a uniform airflow distribution compared to flat surfaces. The composition of a fully premixed burner mainly includes: combustion head, blower, mixed gas, and gas solenoid valve. There are two main types of surface materials for combustion heads: stainless steel and metal fiber woven fabric, with the former being more commonly used. For a stainless steel cylindrical head, many small holes are formed on the wall of a stainless steel cylinder according to the design requirements. The mixture of gas and air is ignited after being sprayed out of a small hole; For the combustion head on the surface of metal fiber woven fabric, the mixture of gas and air evenly seeps out through the surface of the metal fiber and is ignited. Due to being a fully premixed combustion, only a very thin layer of blue flame is formed on the cylinder wall. At the same time, the cylindrical wall is heated to a very high temperature, forming a high-temperature radiation source. Therefore, another difference between this type of burner and the atmospheric burner used in ordinary wall mounted boilers is that the former has both convective and radiative heat transfer for the heat exchanger; Afterwards, the main heat transfer is convection, and the proportion of radiation heat transfer is very small.