BIOMASS GASIFICATION WITH DOLOMITE AND OLIVINE PARTICLES AS A BED INVENTORY IN PRESENCE OF CATALYTIC CERAMIC FILTER

摘要

Continuously biomass gasification trials were carried out in a bench scale gasification plant. The mainrnplant component has been a fluidized bed reactor containing in its freeboard alternately, non-catalytic and catalyticrnceramic filters already used in other gasification tests. Both, catalytic and non-catalytic filters, were delivered by PallrnSchumacher. The fluidized bed inventory was composed of olivine particles contains alternately 10% and 20% byrnweight of dolomite particles. The fluidization gases were air and steam mixed with nitrogen to assure a goodrnfluidization quality. The experimental tests have shown the beneficial effect of the presence of basic materials such asrndolomite, which catalyses the hydrocarbons cracking reactions produced during the devolatilization/pyrolysis processrnof the biomass particles. The simultaneous presence of the iron content in the olivine particles and the nickelrndeposited on the ceramic filter, allowed to reduce the amount of tar in the product gas at a smaller concentration of 57rnmg for normal cubic meter of dry and nitrogen free gas. The results demonstrate the goodness to carry out biomassrngasification process in presence of a mixture of olivine and dolomite particles contained in a fluidised bed with arncatalytic ceramic filter inserted in the freeboard of the gasifier. This plant configuration that use only one reactor,rnallows a significant simplification of the whole gasification process.