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Ash transformations during dual fluidised bed gasification

Swedish environmental goals demand that biofuels be supplied. Dual fluidised bed gasification (DFBG) of biomass can contribute to this. The produced gas can be upgraded to biofuel or be used directly as fuel. DFBG is presently applied in the GoBiGas project.

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It consists of two connected fluidised beds of which one is a combustion reactor that produces heat to the gasification reactor where the gas i produced. The efficiency has been reported to 70 percent.
To increase the efficiency, problems with the ash in the biomass have to be handled: deposit formation, corrosion, agglomeration of bed material and poisoning of catalysts. The purpose of the present project is to obtain new knowledge about the ash elements in the gasification process. Such knowledge is concentration and form of ash elements in the solid phase, the fraction in the gas phase, and the tendency of bed materials to accumulate ash elements.