Application to Stack-Gas Scrubbing

Several papers describe extension of the Haure work to the scrubbing of industrial stack gases as one step of a carbon based stack-gas cleanup process referred to as the RTI-Waterloo Process (Gangwal et al., 1992  

The attraction of periodic flow interruption for scrubbing is that the pressure drop is low relative to continuous, packed-bed scrubbers and a commercially useful acid can be produced. The catalyst is cheap, but that 

Assuming plug flow of both phases in the trickle bed, a volumetric mass transfer coefficient, k a, was calculated from the measurements. The same plug flow model was then used to estimate bed depth necessary for 95% SOz removal from the simulated stack gas. Conversion to sulfuric acid was handled in the same way, by calculating an apparent first-order rate constant and then estimating conversion to acid at the bed depth needed for 95% S02 removal. Pressure drop was predicted for this bed depth by multiplying 

A systematic study of the cycling variables, cycle period (t), flush duration (D) or cycle split (s), and the liquid loading (u,) for the poorer performing BPL activated carbon is reported by Lee et al. (1995). All their measurements were undertaken at 80°C. Contrary to the influence of period seen in Fig. 27, Lee et al. observed that SO2 removal and conversion to acid increase as r augments while holding s constant. Results of this study are summarized in Fig. 29. The middle figure suggests there is an optimum 

Estimated Carbon Bed Depth and Pressure Drop at 95% S02 Removal  

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