a333f842-8a52-43d9-97ac-4395445cb9de20211115085310046naun:naunmdt@crossref.orgMDT DepositInternational Journal of Geology1998-449910.46300/9105http://www.naun.org/cms.action?id=28304720214720211510.46300/9105.2021.15https://www.naun.org/cms.action?id=23318MartinoPaolucciSEAR sc. Parco Scientifico e Tecnologico di Tor Vergata, Via della ricerca scientifica Roma – ItalyCarloBorgianniSEAR sc. Parco Scientifico e Tecnologico di Tor Vergata, Via della ricerca scientifica Roma – ItalySoniaPanzieriSEAR sc. Parco Scientifico e Tecnologico di Tor Vergata, Via della ricerca scientifica Roma – ItalyBenedettade CaprariisDept. of Chemical Eng. University of Rome ”La Sapienza” Via Eudossiana 18, 00184 Roma - ItalyPaolode FilippisDept. of Chemical Eng. University of Rome ”La Sapienza” Via Eudossiana 18, 00184 Roma - ItalyThis paper investigates the gasification efficiency of a two stage gasifier, described in all detail in previous works, as a function of the heat loss across the reactor walls. The behaviour of the reactor was simulated using a simple mathematical model already reported in previous papers. The examined heat loss ranges from 0% of the heat produced by the exothermic reactions into the reactor, up to 20%. Calculations have been performed by keeping constant both the injected total oxygen and its partition between the two stages, while different feedstocks have been used, such as landfill gas, municipal solid waste (MWS), willow and rice straw. The results of calculation show that the gasification efficiency at fixed oxygen injection is greatly influenced by the feedstock. The elaboration of the obtained data indicates also that the trend of the gasification efficiency vs. heat loss is a function of the high heating value of the feedstock and of the ratio between the oxygen present into the reactor (injected + the one of the feedstock) and the stoichiometric oxygen necessary to transform the feeding into carbon dioxide and steam.111520211115202161639https://www.naun.org/main/NAUN/geology/2021/a182004-009(2021).pdf10.46300/9105.2021.15.9https://www.naun.org/main/NAUN/geology/2021/a182004-009(2021).pdfEnergy from Waste: State-of-the-art-report. 5th Ed. 2006. ISWA Working Group on Thermal Treatment of Waste. Rambøll: Danmark. 10.1016/s0956-053x(03)00038-2T. Malcow, “Novel and innovative pyrolysis and gasification technologies for energy efficient and environmentally sound MSW disposal”. Waste management, vol 24, pp 53-79, 2004. 10.1016/s0016-2361(02)00097-2C. Borgianni, P. Defilippis, M. Paolucci, F. Pochetti, "Gasification process of waste containing PVC", Fuel, vol 81, pp. 1827-1833, 2002. 10.1016/j.biombioe.2003.11.009C. Borgianni. P. De Filippis. F. Pochetti. M. Paolucci: "Gasification process of Cuban bagasse in a two-stage reactor" Biomass & Bioenergy vol. 27, pp. 247-252, 2004. 10.1177/0734242x0302100508P. Defilippis, F. Pochetti, C. Borgianni, M. Paolucci, "Automobile shredder residue gasification", Waste Management & Research vol. 21- pp. 459-466, 2003. 10.1016/j.wasman.2004.02.014P. Defilippis, C. Borgianni, M. Paolucci, F. Pochetti, "Prediction of syngas quality for two-stage gasification of selected waste feedstock”, Waste Management, 24, pp. 633-639, 2004 Phyllis Database for biomass and waste. Energy Research Centre of The Netherlands, http://www.ecn.nl/phyllis