Periodic flow interruption in trickle-bed

IV. Conversion of S02 in Trickle-Bed Catalytic Scrubbers Using Periodic Flow Interruption... 

Fig. 22. Thermocouple temperature readings in an experimental trickle bed operating under periodic flow interruption with t = 60 min and a time-average u = 1.65 mm/s (a) r = 0.5, (b) s = 0.25, (b) s = 0.1. (Figure from Haure et al., 1990, with permission, 1990 Elsevier Science Publishers.)...

Several uncertainties in this periodic process have not been resolved. Pressure drop is too high at SV = 10,000 h 1 when packed beds of carbon are used. Study of carbon-coated structured packing or of monoliths with activated carbon washcoats is needed to see if lower pressure drops at 95% SO2 removal can be achieved. Stack gas from coal or heavy oil combustion contains parts-per-million or -per-billion quantities of toxic elements and compounds. Their removal in the periodically operated trickle bed must be examined, as well as the effect of these elements on acid quality. So far, laboratory experiments have been done to just 80°C use of acid for flushing the carbon bed should permit operation at temperatures up to 150°C. Performance of periodic flow interruption at such temperatures needs to be determined. The heat exchange requirements for the RTI-Waterloo process shown in Fig. 26 depend on the temperature of S02 scrubbing. If operation at 150°C is possible, gas leaving the trickle bed can be passed directly to the deNO, step without reheating. 

Periodic interruption of liq- Canada, Argen-uid flow in a trickle-bed re- tina, Russia, actor USA, Korea,... 

Periodic interruption of liquid flow in a trickle-bed reactor... 

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