Simulations of a plant with a fluidized bed gasifier WGS and PSA

Nowadays the renewable energy has an even more important role. In particular, among these, in the European countries the energetic valorisation of biomass is very important. In this way also waste biomass become an economic and environmental resource to produce both energy and energy vectors, as hydrogen.The aim of this work has been the evaluation of the hydrogen production in a gasifier plant simulations. Using ChemCAD software simulations of a plant composed of a double bubbling fluidized bed combustor and steam gasifier with catalytic filters candles, HT/LT-WGSR and PSA have been carried out. In these tests the steam to biomass ratio and the operating gasifier temperature have been changed. The simulation results show that to increase the hydrogen yield the optimal operating conditions should be characterized by high gasification temperature, high steam to biomass ratio and operation of the water gas shift reactors with an excess of steam. Therefore best results have been reached at 850°C with a steam to biomass ratio of 2