A two-phase one-dimensional biomass gasification kinetics model

Fiaschi, Daniele; Michelini, Marco

doi:10.1016/s0961-9534(01)00018-6

Cited by 69 publications

(27 citation statements)

References 9 publications

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“…The water-free (wf) composition of the fuel is presented in Table 4. According to former studies (Schuster et al, 2002;Bilodeau et al, 1993;Fiaschi and Michelini, 2001;Liliedahl and Sjöström, 1997;Wang and Kinoshita, 1993) as well as extensive measurements at the process development unit used in this work and at the biomass combined heat and power plant in Guessing Loeffler et al, 2003;Kaiser et al, 2003) it can be assumed that the char consists of pure carbon. The tar composition is measured for every experiment according to the method described in chapter 3.2.…”

Section: Mass and Energy Balancesmentioning

confidence: 99%

Comparison of dual fluidized bed steam gasification of biomass with and without selective transport of CO2

Pfeifer

Puchner

Hofbauer

2009

Chemical Engineering Science

182

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Section: Mass and Energy Balancesmentioning

confidence: 99%

Comparison of dual fluidized bed steam gasification of biomass with and without selective transport of CO2

Pfeifer

Puchner

Hofbauer

2009

Chemical Engineering Science

182

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“…It is common to model the initial devolatilization as complete and instantaneous (Gungor, 2011;Basu and Kaushal, 2009;Fiaschi and Michelini, 2001). That is, regardless of where the biosolids enter, the moisture is vaporized and some products (CO, CO 2 , H 2 , CH 4 , tar, and solid char) are given off.…”

Section: Drying and Devolatilization (Dd) Zonementioning

confidence: 99%

Development of a chemical kinetic model for a biosolids fluidized-bed gasifier and the effects of operating parameters on syngas quality

Champion

Cooper

Mackie

et al. 2013

Journal of the Air & Waste Management Association

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In an effort to decrease the land disposal of sewage sludge biosolids and to recover energy, gasification has become a viable option for the treatment of waste biosolids. The process of gasification involves the drying and devolatilization and partial oxidation of biosolids, followed closely by the reduction of the organic gases and char in a single vessel. The products of gasification include a gaseous fuel composed largely of N 2 , H 2 O, CO 2 , CO, H 2 , CH 4 , and tars, as well as ash and unburned solid carbon. A mathematical model was developed using published devolatilization, oxidation, and reduction reactions, and calibrated using data from three different experimental studies of laboratory-scale fluidized-bed sewage sludge gasifiers reported in the literature. The model predicts syngas production rate, composition, and temperature as functions of the biosolids composition and feed rate, the air input rate, and gasifier bottom temperature. Several data sets from the three independent literature sources were reserved for model validation, with a focus placed on five species of interest (CO, CO 2 , H 2 , CH 4 , and C 6 H 6 ). The syngas composition predictions from the model compared well with experimental results from the literature. A sensitivity analysis on the most important operating parameters of a gasifier (bed temperature and equivalence ratio) was performed as well, with the results of the analysis offering insight into the operations of a biosolids gasifier.Implications: As gasification becomes a more prominent waste disposal option, understanding the effects of feedstock composition and gasifier parameters on the production of syngas (rate and quality) becomes increasingly important. A model has been developed for the gasification of dried sewage sludge that will allow for prediction of changes in syngas quality (and energy recovery from the waste), and should be helpful in assessing the benefits of new gasification projects. IntroductionGasification is the thermochemical conversion of organic feedstock into a synthetic gaseous fuel at high temperatures using a limited amount of air. The gaseous fuel produced by a gasifier is referred to as syngas or producer gas. Gasification lies between combustion and pyrolysis, and is a process that utilizes a substoichiometric amount of oxygen for partial oxidation of the feedstock. This in turn provides heat for the largely endothermic reduction reactions that produce the syngas, as well as the initial devolatilization of the biomass within the gasifier.Gasification is an efficient process for reducing the volume of waste, and is a process capable of delivering net energy gains (Greenhouse Gas Technology Center [GGTC], 2012; PuigArnavat et al., 2010). The remaining solids from the process are composed of the mineral ash that was contained in the feed and small amounts of organic ash, principally unreacted solid carbon (char). It is estimated that 7.2 million dry tons of sewage sludge are generated annually in the United States (North East Biosolids and Res...

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“…In this model, on the contrary to other studies [17], the hydrodynamic parameters in the fluidized bed were considered, besides the transport and thermodynamic properties, since they affect both the mass and heat interchange coefficients between the bubble and emulsion phases. In addition, different fluidized bed gasifier models were developed in literature [18]- [19], but in most of them tar were not studied or studied as one single lump and, in any case, not in presence of olivine as bed material. In this work, benzene, toluene, phenol and naphthalene were taken into account as most representatives of tar [20]- [21], aiming at improving the accuracy of the model: the kinetic models for tar conversion were extrapolated by literature using olivine as bed material, since it is a good natural catalyst for the primary conversion of tar directly in the fluidized bed [22].…”

Section: Introductionmentioning

confidence: 99%

Perovskite sensing materials for syngas composition monitoring and biomass gasifier numerical model validation: A preliminary approach

Pallozzi¹,

Carlo²,

Zaza³

et al. 2016

AIP Conference Proceedings

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Abstract. Biomass gasification represents a suitable choice for global environmental impact reduction, but more efforts on the process efficiency need to be conducted in order to enhance the use of this technology. Studies on inputs and outputs of the process, as well as measurements and controls of syngas composition and correlated organic and inorganic impurities, are crucial points for the optimization of the entire process: models of the system and sensing devices are, thus, very attractive for this purpose. In particular, perovskite based chemoresistive sensors could represent a promising technology, since their simplicity in function, relatively low cost and direct high temperature operation. The aim of this work is to develop a steam fluidized bed biomass gasifier model, for the prediction of the process gas composition, and new perovskite compounds, LaFeO 3 based, as sensing material of chemoresistive sensors for syngas composition and impurities measurements. Chemometric analysis on the combustion synthesis via citrate-nitrate technique of LaFeO 3 was also performed, in order to evaluate the relationship between synthesis conditions and perovskite materials and, thus, sensor properties. Performance of different sensors will be tested, in next works, with the support of the developed gasifier model.

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A two-phase one-dimensional biomass gasification kinetics model

Cited by 69 publications

References 9 publications

Comparison of dual fluidized bed steam gasification of biomass with and without selective transport of CO2

Comparison of dual fluidized bed steam gasification of biomass with and without selective transport of CO2

Development of a chemical kinetic model for a biosolids fluidized-bed gasifier and the effects of operating parameters on syngas quality

Perovskite sensing materials for syngas composition monitoring and biomass gasifier numerical model validation: A preliminary approach

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