New catalytic filter technology provides important added flexibility in controlling PM, NOX, SOX and O-HAPS - Case study
Catalyst-embedded ceramic filters offer a new technological capability of removing NOX at lower temperatures, while simul-taneously removing PM, SOX and HCl. The technology also removes organic hazardous air pollutants (O-HAPS) THC, dioxins and mercury, all in a single compact system.
Applications for the technology include: the Cement NESHAP; Boiler MACT for coal; incinerator CISWI MACT; Hazardous Waste MACT; regulations on glass furnaces; ceramics manufacturing, including fracking proppants, kilns of all varieties; and thermal oxidizer clean up.
As regulations proliferate and become more stringent, the filters offer a powerful straightforward approach compared to a long train of stand-alone equipment. The advantages are not in performance alone, but in capital cost and operating expense.KE VIN MOSS.
Typically, PM is removed to ultralow levels (less than 2 mg per Nm3, 0.001 grains per dscf ), while other pollutants can be eliminated at levels greater than 90 percent.
European Successes Jump the Pond
I.ow-densily ceramic filters, often called 'candles' because of their solid tube shape, have been used in pollution control to remove PM and acid gases since the late 1980s. The additional capability to reduce NOx, dioxins and O HAP THC became available in 2005 with the innovation of embedding filter walls with micronized catalyst.
With the success of the first systems in Europe, Japan and Australia, the United States now has regulations that require use of this advanced technology. There has been a sharp upswing of projects as the capability of these systems has become more widely known.
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