POLYGENERATION AT THE BIOMASS STEAM GASIFICATION PLANT OBERWART - EVALUATION OF PROCESS CHAINS TO PRODUCE HYDROGEN, ELECTRICITY AND HEAT

摘要

This work presents an evaluation of two process chains to produce renewable H2 from the wood gasrngenerated by the biomass CHP plant Oberwart. Based on several thousand hours of operation, which were carried outrnat test facilities within the last years, mass and energy balances of different process set-ups were simulated andrnevaluated using the simulation software IPSEpro. For gas cleaning and upgrading five process steps (process units)rnwere considered:rn(1) Carbon monoxide conversion over a catalyzed water gas shift (WGS) reaction to increase the H2 contentrn(2) Gas cleaning in a wet chilled gas scrubber (GS) with organic solventrn(3) H2 enrichment in a membrane (MEM) separation unitrn(4) H2 purification in a pressure swing adsorption (PSA) unitrn(5) Demonstration of the utilization of the pure H2 in a commercial proton exchange membrane (PEM) fuel cell.rnExperiments and long term test runs with two process chains were investigated in detail:rnProcess Chain I: GS-MEM-PSArnProcess Chain II: WGS-GS-PSA.rnSummarizing the results, both process chains achieve high fuel conversion efficiencies of 77 %. Process chain Irnshould be applied if less H_2 is needed and the power and heat demand is prioritized, whereas process chain II canrnreach higher H2 yields.