The severe fouling and slagging problem due to high alkali and alkaline earth metal content still limits the applications of self-sustained biomass power plants. It is essential to study dynamic behavior of ash deposition in pure biomass combustion. Three kinds of biomass, saw dust, wheat straw and corn stover, were burned in a 25kW one dimensional down-fired furnace. The deposited ash mass, collection efficiency, deposition morphology and ash deposit composition were studied. The results indicate that the deposition mass, collection efficiency and deposition area all achieve a minimum at an intermediate 600 ℃ of tube surface temperature.The highly reactive potassium plays important role in ash deposition process, causing a higher deposition rate of wheat straw than corn stover. The results under different sampling time periods indicate that the depositing rate exhibits a trend of “fast-slow-fast-slow” process.

Publication：Li GD, Li SQ*, Xu XG, Huang Q, Yao Q. Dynamic behavior of biomass ash deposition in a 25 kW one-dimensional down-fired combustor. Energy & Fuels, 28(1): 219-227 (2013).