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Montigny-lès-Metz, France

Rapagna S.,University of Teramo | Gallucci K.,University of LAquila | Marcello M.,University of Teramo | Matt M.,University of Metz Sci | Foscolo P.U.,University of LAquila
19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7 | Year: 2010

A bench-scale biomass gasification plant operating at 1 atm was used to check innovative, catalytic hot gas cleaning processes and plant arrangements. The cleaning step is realized by means of Fe-olivine used as a catalytic bed inventory for tar, methane, and H 2S reforming. Tests performed by using Fe-olivine particles as the reactor fluidized bed inventory demonstrated that they are more active than olivine particles. The Fe-olivine particles were still active even when they have been stressed for many hours under a vigorous fluidization state at high temperature. The use of Fe as the active catalytic element did not pose any environmental risk. The use of Ni grains contained into a ceramic candle assures almost complete elimination of tar compounds in the product gas and prevents char particles to be elutriated from the gasifier. This is an abstract of a paper presented at the 7th European Congress of Chemical Engineering-7 and the 19th International Congress of Chemical and Process Engineering CHISA (Prague, Czech Republic 8/28/2010-9/1/2010). Source


Rapagna S.,University of Teramo | Gallucci K.,University of LAquila | di Marcello M.,University of Teramo | Matt M.,University of Metz Sci | And 3 more authors.
Bioresource Technology | Year: 2010

A bench-scale fluidized-bed biomass gasification plant, operating at atmospheric pressure and temperature within the range 800-820 °C, has been used to test an innovative gas cleaning device: a catalytic filter candle fitted into the bed freeboard. This housing of the gas conditioning system within the gasifier itself results in a very compact unit and greatly reduced thermal losses. Long term (22 h) tests were performed on the gasifier both with and without the catalytic candle filter, under otherwise identical conditions. Analysis of the product gas for the two cases showed the catalytic filtration to give rise to notable improvements in both gas quality and gas yield: an increase in hydrogen yield of 130% and an overall increase in gas yield of 69% - with corresponding decreases in methane and tar content of 20% and 79%, respectively. HPLC/UV analysis was used to characterize the tar compounds. © 2010 Elsevier Ltd. All rights reserved. Source


Rapagna S.,University of Teramo | Gallucci K.,University of LAquila | Di Marcello M.,University of Teramo | Di Marcello M.,University of Metz Sci | And 2 more authors.
Chemical Engineering Transactions | Year: 2010

In the present work, a bench-scale biomass gasification plant operating at atmospheric pressure is utilized in this work to check innovative, catalytic hot gas cleaning processes and plant arrangements. The cleaning step is realized by means of Fe/olivine, used as catalytic bed inventory for tar, methane and H2S reforming, or Fe/olivine coupled with a catalytically active filter candle. Natural olivine has been used in fluidized bed gasifier thanks to the catalytic activity and the mechanical strength. Iron (III) in his structure is responsible of the tar cracking reaction because of its efficiency in ring opening. Impregnation of iron leads to an improved catalytic efficiency. The aim of this work is to test the Fe/olivine in real gasification condition using a fluidized bed gasifier. Copyright © 2010, AIDIC Servizi S.r.l. Source


Rapagna S.,University of Teramo | Gallucci K.,University of LAquila | Di Marcello M.,University of Teramo | Di Marcello M.,University of Metz Sci | And 4 more authors.
Fuel | Year: 2012

Al 2O 3 based grain-sintered filter element support was first impregnated with a fine, wet-milled suspension of a MgO-Al 2O 3 and successively with nickel nitrate hexahydrate. The catalytic filter candle was inserted in the freeboard of a 0.1 m I.D. fluidized bed biomass gasifier, in order to obtain a very compact gasification and hot gas cleaning unit. Continuous catalytic steam gasification runs of almond shells have been performed in a temperature range of 808-813°C (maintained by means of an electric furnace), and the volume composition of the product gas has been analyzed by means of IR, UV and TCD facilities for online detection of CO, CO 2, CH 4, H 2, NH 3 and H 2S. A 20 h test has been performed with intermediate char burning steps. The measured gas yield was 2.09 Nm 3/kg daf, meanwhile the gas composition in % by volume was H 2 = 56, CO = 22, CO 2 = 20, and CH 4 = 2. NH 3 and H 2S in the dry gas were 60-80 ppmv and 10-15 ppmv, respectively. © 2012 Elsevier Ltd. All rights reserved. Source

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