An experiment was performed by placing HOK-(coke)/Ca (OH)(2)-particles
in a circulating fluidized bed reactor. Defined model waste gases con
taining HCl/SO2/Hg-0/Hg2+ were fed through the reactor. Fundamental in
vestigations were made to discover absorption of Hg-0 and Hg2+. Major
influences in exhaust gas cleanings such as the mercury content of the
gas, the temperature and the HCl/SO2 influence were taken into consid
eration. The results were not as expected because when all the factors
(mentioned above) were varied in the investigated field were no defin
ed effects. The reason could be the short time of the gas-solid-contac
t was present in the circulating fluidized bed reactor (< 1 s) and the
mercury desorption beginning at an approximate temperature of 100 deg
rees C. This might have led to the reduction in mercury immobilisation
. The experiments showed the following: When coke and mercury were pre
sent in the reactor a marked increase in the absorptive removal of HCl
/SO2. Because of the coke the chemisorption processes were catalysed a
nd accelerated.