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Gasification Reaction Pathways of Condensable Hydrocarbons
journal contribution
posted on 2016-04-26, 00:00 authored by Mikael Israelsson, Henrik ThunmanDual
fluidized bed (DFB) gasification of biomass generates numerous
species with large differences in size and boiling point. At the heavier
(tar) end, the produced species range from benzene to coronene. In
this work, a method for elucidating the pathways of tar evolution
is applied to previously presented measurements that satisfy the carbon
balance of the Chalmers 2–4-MW DFB gasifier. In addition to
quantifying the cold gas and tar, the measurements yield information
regarding the amount and C, O, H composition of unknown condensable
species (UCS). The reaction pathways were identified by means of fitting
a model to the performed measurements. The employed solver varies
freely the reaction rate coefficients of three global reactions (mimicking
dissociation and reactions with hydrogen and steam) per modeled group,
as well as the carbon distribution coefficients within a predefined
reaction scheme. The mature tar (excluding primary tar) spectrum is
divided into phenols, furans, benzene, naphthalene, pyrene, and one-,
two-, and three-ring aromatic components. In addition, UCS that are
considered to contain primary tar are divided into four subgroups,
to encompass two levels of reactivity with varying composition. Ultimately,
the solver converges, yielding a reaction scheme that is based on
the findings of earlier works and that describes the creation of mature
tar from UCS. Furthermore, the importance of individual reaction routes
is discerned for the pertinent measurements. Thus, it is demonstrated
that the maturation of secondary tar species (e.g., toluene and phenol)
is not in itself sufficient to describe the formation of the tar spectrum.
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H compositionreaction rate coefficientsDFBmeasurementcondensable speciestar evolutionreaction pathwaysMWspecies rangetar spectrumGasification Reaction Pathwayspredefined reaction schemeCondensable Hydrocarbonscarbon distribution coefficientstar speciesfluidized bedreaction routesUCScarbon balancesolver convergesreaction scheme
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