Removal of VOC, NOx, CO and dust by flexible catalytic solutions.

In order for plants to be able to comply with the NES-HAP (National Emissions Standard for Hazardous Air Pollutants) emission regulations in the US, catalytic filtration consists of two solutions, both with combined dust removal and catalytic conversion of organic hazardous air pollutants (oHAPs) as well as nitrogen oxides (NOx) and ammonia (NH3):
— Catalytic ceramic filters consisting of ceramic elements with the advantage to withstand higher temperature than the normal filter bags.
— Catalytic fabric filters, equipped with special multilayer catalytically active woven filter material. The strengths of this solution are the adaptability in design to fit the physical dimensions of an existing filter and the flexibility in components to be removed.
The choice of these two solutions provides maximum flexibility in adaptation to and process integration into existing plants as well as new pyro lines, resulting in lowest possible capital expenditure (CAPEX) and operational expenditure (OPEX). Test results from slip stream trials and full scale of both solutions show a high removal efficiency of dust, oHAPs as well as NOx and CO.

Author: P. Aresta, K. Poulsen

Section: Ecology and safety

Keywords: catalytic filtration, deNOx, NESHAP, oHAPs, SCR