As part of a long-term research project the intention is to develop the basic principles for a flue gas cleaning process operation on a semi-dry basis for use in small and medium-sized combustion systems. The flue gases at temperatures around 100 degrees C are passed through a semi-moist layer of slaked slaked lime operated at around the dew point which is supported as filter cake on a suitable filter medium. The second part of this series describes the agglomeration characteristics and the recarbonation of slaked slaked lime particles while flowing in a moist atmosphere containing CO2. It is shown that the agglomeration characteristics of normal commercial slaked limes and their reactivity to carbon dioxide are both strongly influenced by water vapour. It does in fact improve the flow resistance of a filter layer made of slaked lime, but this is possibly also associated with reduced retention of harmful acid gas components. The article summarizes the present state of the investigation.
