Deliverable D3.2: Results of the experimental campaigns in the 1.7 MWth pilot plant, I

This deliverable presents the experimental results obtained to date in experimental campaigns carried out in la Pereda CFB-CaL pilot, under Task 3.2 of the CaLby2030 project. Progress in all sub-tasks has been achieved thanks to these results, including some key objectives of WP3. About 720 hours of additional operations on the pilot have been executed, accumulating more than 1320 hours since the beginning of CaLby2030. Successful initial tests achieved calcination efficiencies of between 96-98% when operating the calciner under oxy-combustion conditions burning biomass pellets. After solving issues linked to the solid circulation between reactors, tests with CO2 capture in the carbonator demonstrated the stability and controllability of the pilot when using biomass as a fuel in the calciner, reaching in some dedicated tests CO2 capture efficiencies over 99%. Interpretation of the results is consistent with basic models of the reactors and will supply information for the tuning of more advanced, dynamic and scalable models under development in WP4, supporting also design decisions for WP1-WP2. Preliminary tests on the la Pereda pilot, feeding plastics containing F and Cl as a proxy of WtE plants, indicate an extreme efficiency of the CFB-CaL system to capture in the solid phase Cl and F acid gases. These results are to be confirmed in future tests involving more realistic conditions (i.e. Ca(OH)2 powder injection to the carbonator, gas recycle in the calciner, full operation with flue gases in the carbonator) and in independent analysis of solid samples (Task 3.3 ongoing), to be reported in D3.3.