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EDV wet scrubbing systems with LoTOx technology

For control of NOX emissions, the BELCO® EDV® Wet Scrubbing System uses a patented LoTOx™ process from The Linde Group. In the LoTOx™ process, NOX compounds are oxidized with ozone to form compounds that are easily removed from the flue gas by the same liquid-gas contact that removes particulate and SOX. The process is well suited for meeting the demanding requirements of FCCU applications. There are none of the process and mechanical problems associated with using SCRs for NOX control on FCCUs.

The hot flue gas is quenched to saturation by a set of spray nozzles, as is normally done in the EDV® Wet Scrubbing System. A reaction zone that is unique to the EDV® Wet Scrubbing System follows the quench sprays. It is here that ozone (O3) is injected into the flue gas. The O3 preferentially oxidizes the NOX to N2O5. With the flue gas being fully saturated, the N2O5 combines with water vapor in the flue gas to form nitric acid (HNO3). This all occurs in the reaction zone.

Following the reaction zone the flue gas is scrubbed by the absorber sprays and filtering modules for absorption of SO2 and removal of particulate, as is normally done in the DuPont™ BELCO® Technologies EDV® Wet Scrubbing System. These absorber sprays also remove the nitric acid and unreacted ozone from the flue gas to provide the final step in the NOX control process.

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