Alkali removal with mineral sorbents – Part I: Sorption capacity and reaction kinetics

Aluminosilicate sorbents show the potential to reduce alkali-related problems during solid fuel conversion suchas deposit build-up and corrosion damages. The alkali capacity, the reaction kinetics and the surface area development of the sorbents under operating conditions are essential parameters for the mathematical description ofthe alkali sorption. In this work, three sorbents, kaolin, bauxite and bentonite, are characterized in this regard bythermogravimetric analysis. The sorption behavior of kaolin surpasses the other sorbents due to the highest loading capacity and thetemperature-stability of the porous structure.However, thesuitability assorbent in solidfuelconversion processes isgiven for all materials. A mathematical sorption modelisappliedtothe experimentaldatain order to derive kinetic parameters of the sodium and potassium sorption under syngas andflue gas atmo-sphere. Thus, this work provides the necessary dataset for the design and optimization of the sorbent use in in-dustrial processes.     «

Aluminosilicate sorbents show the potential to reduce alkali-related problems during solid fuel conversion suchas deposit build-up and corrosion damages. The alkali capacity, the reaction kinetics and the surface area development of the sorbents under operating conditions are essential parameters for the mathematical description ofthe alkali sorption. In this work, three sorbents, kaolin, bauxite and bentonite, are characterized in this regard bythermogravimetric analysis. The sorption behavior...     »