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Destruction of the tar present in syngas by combustion in porous media

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dc.contributor.authorCarvalho, T.
dc.contributor.authorCosta, Mário
dc.contributor.authorCasaca, Cláudia
dc.contributor.authorCatapan, Rafael C.
dc.contributor.authorOliveira, A. A. M.
dc.date.accessioned2016-04-19T11:13:30Z
dc.date.available2016-04-19T11:13:30Z
dc.date.issued2014-02
dc.description.abstractThe cleaning of syngas is one of the most important challenges in the development of technologies based on gasification of biomass. Tar is an undesired byproduct because, once condensed, it can cause fouling and plugging and damage the downstream equipment. Thermochemical methods for tar destruction, which include catalytic cracking and thermal cracking, are intrinsically attractive because they are energetically efficient and no movable parts are required nor byproducts are produced. The main difficulty with these methods is the tendency for tar to polymerize at high temperatures. An alternative to tar removal is the complete combustion of the syngas in a porous burner directly as it leaves the particle capture system. In this context, the main aim of this study is to evaluate the destruction of the tar present in the syngas from biomass gasification by combustion in porous media. A gas mixture was used to emulate the syngas, which included toluene as a tar surrogate. Initially, CHEMKIN was used to assess the potential of the proposed solution. The calculations revealed the complete destruction of the tar surrogate for a wide range of operating conditions and indicated that the most important reactions in the toluene conversion are C6H5CH3 + OH <-> C6H5CH2 + H2O, C6H5CH3 + OH <-> C6H4CH3 + H2O, and C6H5CH3 + O <-> OC6H4CH3 + H and that the formation of toluene can occur through C6H5CH2 + H <-> C6H5CH3. Subsequently, experimental tests were performed in a porous burner fired with pure methane and syngas for two equivalence ratios and three flow velocities. In these tests, the toluene concentration in the syngas varied from 50 to 200 g/Nm(3). In line with the CHEMKIN calculations, the results revealed that toluene was almost completely destroyed for all tested conditions and that the process did not affect the performance of the porous burner regarding the emissions of CO, hydrocarbons, and NOx.pt_PT
dc.identifier.citationCARVALHO, T.; [et al] - Destruction of the tar present in syngas by combustion in porous media. Energy & Fuels. ISSN 0887-0624. Vol. 29, N.º 2 (2015), pp. 1130-1136pt_PT
dc.identifier.doi10.1021/ef501807ppt_PT
dc.identifier.issn0887-0624
dc.identifier.issn1520-5029
dc.identifier.urihttp://hdl.handle.net/10400.21/6033
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAmer Chemical Socpt_PT
dc.subjectLow calorific valuept_PT
dc.subjectRich gaseous fuelspt_PT
dc.subjectEnergy-productionpt_PT
dc.subjectHeat-transferpt_PT
dc.subjectBiomasspt_PT
dc.subjectBurnerspt_PT
dc.subjectTechnologiespt_PT
dc.subjectConversionpt_PT
dc.subjectReductionpt_PT
dc.subjectMixturespt_PT
dc.titleDestruction of the tar present in syngas by combustion in porous mediapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1136pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage1130pt_PT
oaire.citation.titleEnergy & Fuelspt_PT
oaire.citation.volume29pt_PT
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT

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