The three formation stages of slagging in biomass burners

Many users have never understood why the biomass burner will form slag after a period of use. This is a fairly common phenomenon in biomass burners, mainly because the softened or molten ash particles are not sufficiently cooled, and It is caused by heat exchange at a lower temperature. It can be seen that the formation process of slagging in the biomass burner can be pided into three stages. In the first stage, when the fuel is burned in the biomass burner, as the furnace temperature rises, the ash is partially reached. At the softening temperature, the ash particles will soften, so that the sodium, calcium, potassium and a small amount of sulfate in the ash will form a sticky surface. In the second stage, as the temperature in the fuel layer in the biomass burner increases, the temperature in the oxidation layer and the reduction layer exceeds the softening temperature of the ash, especially in the reduction layer, the Fe3+ in the fuel is reduced As Fe2+, the ash particles soften and adsorb each other in the reducing layer, forming a large eutectic. In the third stage, the large eutectic in the biomass burner will fall, and will quickly cool down when it encounters the heat exchange surface during the fall, so as to directly form a solid adhering to the heat exchange surface, forming the so-called Slagging. Since there are many factors that affect the slagging of biomass burners, they are not only related to slagging characteristics such as ash melting point, ash composition, and ash viscosity, but also to the thermal parameters of the furnace, the structure and layout of the burner, the aerodynamic working conditions in the furnace, and the boiler Operating parameters are closely related, so all aspects cannot be ignored. In order to avoid slagging in the biomass burner, the first thing to do is to select biomass particles correctly, and try to use wood chips biomass combustion particles. Compared with other biomass fuels, sawdust biomass combustion particles have less slagging phenomenon after combustion, and can be burned fully, and the combustion value is also high. To If you are interested in gas oil burners, please contact us for a quote!