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Catalytic filter bags can slash investment costs for offgas treatment

By Gerald Ondrey |

Last January, Haldor Topsøe A/S (Lyngby; www.topsoe.com) and FLSmidth A/S (Copenhagen, both Denmark; www.flsmidth.com) began a joint, global effort to commercialize a new catalytic filter-bag technology, which the partners have developed over the past four years. Tradenamed EnviroTex, these filter bags are capable of reducing dust, volatile organic compounds (VOCs) and oxides of nitrogen (NOx) in a single, integrated process, says Mikkel Nygaard Larsen, general manager, marketing and sales at Haldor Topsøe. Because EnviroTex treats several pollutants in a single step, the physical footprint of the treatment process is reduced compared to alternative technologies that require separate, standalone systems to handle a specific pollutant, says Nygaard Larsen, and capital expenditures (capex) are significantly reduced — “by as much as 80% for some applications.” The patent-pending EnviroTex filter bags consist of three layers of filter fabric, each of which contains a tailored catalyst that has been optimized for removing specific pollutants from offgases (diagram). The three-layer fabric has a porous, woven structure and the catalyst is a mixture of active base and precious metals. As the offgas passes through the filter, dust…
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