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200 300 400 500 600

TEMPERATURE ("C)

FIG. 5.20.18 Conversion curves for VOC destruction using a catalytic incinerator. (Data from Brown Engineering, Seattle, Wash; Johnson Matthey, Catalytic Systems Division, Wayne, Pa.)

200 300 400 500 600

TEMPERATURE ("C)

FIG. 5.20.18 Conversion curves for VOC destruction using a catalytic incinerator. (Data from Brown Engineering, Seattle, Wash; Johnson Matthey, Catalytic Systems Division, Wayne, Pa.)

The heat for a catalytic incinerator can be applied directly to the catalyst bed, rather than from a burner. The swingtherm system (see Figure 5.20.20) manufactured by Mo-Do Chemetics, Ltd. (Vancouver, Canada and Ornskolsvik, Sweden) uses dual beds at a temperature of 300-350°C. The air stream is fed at 60°C and is heated by contacting a ceramic at 320°C. It then passes through a platinum-based catalyst. The exothermal VOC oxidation raises the temperature of the gases to 350°C. The gases then pass through the other bed to heat the ceramic rings; the effluent gases are cooled to 90°C. When the second reactor is warmed to 320°C, the inflow is reversed. The flow reversal occurs every 2-5 min. For VOC concentrations below 300 ppm, auxiliary heating is required.

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