Emission measurement data of a wood log stove with an integrated two-stage catalytic converter module

Manually fired log wood stoves require a very effective and at the same time economically feasible emission reduction measure in order to be able to use log wood to cover the heat demand in private households in the future. Catalysts integrated in furnaces are a promising way to significantly reduce emissions from incomplete combustion (CO, VOC). In addition to these gaseous oxidizable pollutants, however, there is the big problem that particulate matter is emitted and that, without adapting and converting the combustion system, only about 20 % of particulate matter could be reduced by oxidative catalytic degradation of catalysts. In order to increase the dust reduction significantly, a two-stage catalytic converter module developed by Blue Fire GmbH was integrated in a simple wood-burning stove of the lower price segment (Manufacture: Justus, Model: Falun Stahl, 5 kW) and tested at the DBFZ under simulated natural draft conditions. In the first stage, the soot containing particles are initially retained. In the next step, a part of the carbon-containing components is degraded oxidatively in stage 1 and then discharged again by the flow from stage 1 in order to prevent blocking of stage 1. In the second catalyst stage, the gaseous pollutants CO and VOC are reduced. With this two-stage catalyst arrangement, the pollutants CO could be reduced by more than 80 %, VOC by 50 to 70 % and dust by more than 50 %. The following experimental set-ups were examined:

Data from 27.09.2017: Measurement with stage 1 (ceramic packing) and stage 2 (Pt/Pd foam catalyst) and bypass in stage 1

Data from 29.09.2017: Reference

Data from 15.11.2017: Measurement with stage 1 (ceramic packing) and stage 2 (Pt/Pd foam catalyst) without bypass in stage 1

Data from 03.01.2018: Measurement with modified stage 1 (ceramic filler with Pt coating) and modified stage 2 (V2O5 honeycomb) without bypass in stage 1

Data from 04.01.2018: Measurement with modified stage 1 (ceramic packing with Pt coating) and stage 2 (Pt/Pd foam catalyst) without bypass in stage 1

Data from 17.01.2018: Measurement with modified stage 1 (ceramic filler with Pt coating) and stage 2 (V2O5 honeycomb and Pt/Pd foam catalyst) without bypass in stage 1

The test setup and the evaluation methods are based on DIN EN 13240, as this method is used to achieve comparability of the results.