Integrated Biomass – Solid Oxide Fuel Cell Cogeneration (WoodGas-SOFC 2)
Map of local cell resistance in cm2 after 1600 h (left), juxtaposed (right) to mapping of air side contaminants (Cr, Si, S) by post test analysis (SEM-EDX, values expressed as mol% w.r.t the
amount of cathode, where the contamination was found). Clearly the extent of contamination (here originated from air-side alloy components upstream of the stack) and the extent of degradation are correlated.
Scope of project
This proposal follows up on the project WoodGas-SOFC
(2007-2010), where the following tasks were
accomplished: establishment of a system model of the whole process chain (wood gasification – gas
cleaning units – reformer units – solid oxide fuel cell) evaluating different configurations; methodology of
trace analysis of real wood gas; set-up of test rigs for catalysis and single cells for individual studies of
contaminants; demo runs of SOFC stacks with real wood gas treated with a cyclone filter and a partial
oxidation cracker (CPO). From these results and others emerging elsewhere in parallel (e.g. coal gas
contaminant studies), it has become evident that the gas cleaning section requires an in depth investigation.
This is the subject of WoodGas-SOFC 2.
The background is the development of a 1 MWth scale biomass cogeneration plant using wood as fuel and
combining the 3 key units of gasification, cleaning and a solid oxide fuel cell. The wider perspective
ultimately targets a pilot scale demonstration plant of 1 MWth in order to define the specifications of a
commercial process. The hot gas cleaning system integration has been identified as the most critical topic.