Main renewable energy source used in France, the wood-energy shows several advantages: abundant local resource, employment creation and carbon neutral emission. However, its combustion releases different pollutants such as particle matter or nitrogen oxides which can, during some period of the year, contribute significantly at the atmospheric pollution. Considering the increasing of biomass-energy, in particular the small biomass boilers (< 4 MWth) which will grow fastest in number, and their impact on the environment, it is necessary to develop integrated technologies filtration adapted at this unit scale.
At the exhaust of combustion room, emitted particles are generally trapped by two different devices, inertial filtration (cyclone(s)) for the largest (PM10) and then, porous filter media for the smallest (PM2.5). Concerning the NOx, the most widely used process is the Selective Catalytic Reduction (SCR) over V2O5-WO3 (MoO3)/TiO2 with NH3, as reducing agent, and in excess of O2. However, this SCR unit has to be located at the upstream particles filtration system, because it is efficient at a temperature range of 300 to 400°C, and this brings such problem, as the deposition of dust on catalyst. Several studies have been performed over transition metals oxide from Mn, Fe, Cu, Co and Ni supported on high specific surface materials in order to reduce NOx at lower temperature (< 300°C).
The CORTEA F3 project of which the aim is to develop a functionalized sintered filter to remove simultaneously soots and NOx emitted from small-scale biomass boiler address this issue. The filter media develop in this study is a copper sintered candle prepared by Sintertech SAS-PORAL and functionalized by PRODEC METAL society and/or IMT-Atlantique.
The main challenge of this study is to find a catalyst able to reduce NOx at low temperature (< 300°C); it is for that the results are primarily focused on the NOx efficiency and less on the particle filtration. The tests carried out...
Session: G15 - Hot Gas Cleaning
Day: 15 March 2018
Time: 10:45 - 12:00 h