Investigation of Silica Gels as Adsorbents in SO2 Enriched Gases

Stefan Thiel1, Steffen Krzack1, Friederike Klenert2, Christos G. Aneziris2

1 Institute of Energy Process Engineering and Chemical Engineering, TU Bergakademie Freiberg, Freiberg/Germany
2 Institute of Ceramic, Glass and Construction Materials, TU Bergakademie Freiberg, Freiberg/Germany

Revision 12.12.2016, 22.12.2016

Volume 9, Issue 2, Pages 85 - 93

Abstract

Flue gas cleaning in power plants is required to remove harmful components such as sulphur dioxide SO2, mercury Hg, nitrogen oxides NOx, volatile organic compounds VOC, hydrochloric acid HCl, hydrogen fluoride HF, heavy metals, dioxins, furans and fly ash. In this study, the adsorption performance of silica gels, the breakthrough behaviour regarding SO2 rich gases and the regeneration of silica gels were investigated. Firstly, the influence of different grain sizes on the adsorption of SO2 and secondly the ability of regeneration regarding different grain sizes and relative humidity of storing the silica gels were examined. The best silica gel achieved 25 % of dynamic adsorption capacity and 72 % of the breakthrough time compared to active coke. Suitable conditions for complete thermal regeneration of silica gels were found. Dependent on the grain size and relative humidity of storing the silica gels, a coarse grain and medium relative humidity of 45 % was favourable for a complete regeneration.

Keywords

adsorption of SO2, desorption of SO2, regeneration of adsorbents, flue gas treatment, silica gel

References

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