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Mechanism study on effect of Si and Si-Al chemical compounds on biomass slagging
Author(s): 
Pages: 1559-1564
Year: Issue:  10
Journal: Rural Energy

Keyword:  biomassslaggingpotassiumSi chemical compoundsSi-Al chemical compounds;
Abstract: Because of high content of alkali metal, biomass’ burning would lead combustion equipment get slagged. Therefore, Mechanism of effect of Si and Si-Al chemical compounds on biomass slagging was researched. The results show that, when biomass is burning, Si and Si-Al chemical compounds would help water-soluble K tend to transfer into insoluble silicates and aluminosilicates. The reactions in the process are the same as pure biomass burning. At 815 ℃, near the combustion temperature of fluidized bed furnace, Si chemical compounds would make ash to generate potassium silicates easily, which has a low melting point and would cause low-temperature molten slagging. Thus, choosing Si chemical compounds as slagging inhibitors needs to be treated with caution.At 1 000 ℃, near the combustion temperature of grate boiler, Si-Al chemical compounds can not only lighten alkali slagging, but also reduce ash molten slagging. Thus, Si-Al chemical compounds are excellent slagging inhibitors for grate boiler.
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