To find optimum operating condition for simultaneous removal of acidic and volatile organic gases, a laboratory scale spray dryer sorber(SDS) is designed and operated. And operating condition is experimentally varied to evaluate important factors affecting the process and efficiency of simultaneous removal of acidic and VOC gases.
$SO_2$ as a acidic gaseous pollutant and vinyl chloride and benzene as volatile toxic gas are selected due to their relevance to solid waste incineration. As sorbent three types of slurries are; 10 wt.% $Ca(OH)_2$, lime slurry added activated carbon(A.C.), and dry A.C. powder.
Inside of the SDS the region is subdivided into absorption, transition, and adsorption regions by temperature control and injection of lime slurry. Removal efficiencies of $SO_2$ at each of the three regions are observed at different operational conditions of SDS. The effects of several operating parameters such as temperature, approach to saturation temperature, relative humidity, on the SDS performance are determined.
To find effect of activated carbon injection in removal of acidic and volatile organic gases, type and injection port of activated carbon is varied and its removal efficiency at each condition is experimentally compared and analysed.
The removal properties of $SO_2$ and VOCs are fitted to the temperature profile, therefore temperature control is required to enhance removal efficiency of acidic and VOCs gaseous pollutants
For optimum VOCs removal, sufficient ammount of the dry A.C. powder should is injected into adsorption region, and its residence time acts as an important factor. If temperature and loss of A.C. in SDS is considered, injection port located at between SDS and bag filter is recommended.
