Biomass Pyrolysis: Comments on Some Sources of Confusions in the Definitions of Temperatures and Heating Rates

Lédé, Jacques

doi:10.3390/en3040886

Cited by 53 publications

(19 citation statements)

References 18 publications

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“…To model the mass loss, the torrefaction reaction rate was assumed to be represented by a first order rate, which a rather common assumption in many torrefaction studies (Lédé, 2010;Funke et al, 2017), or…”

Section: Torrefactionmentioning

confidence: 99%

Properties of Torrefied U.S. Waste Blends

Zinchik

Kolapkar

et al. 2018

Front. Energy Res.

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Power generation facilities in the U.S. are looking for a potential renewable fuel that is sustainable, low-cost, complies with environmental regulation standards and is a drop-in fuel in the existing infrastructure. Although torrefied woody biomass, meets most of these requirements, its high cost, due to the use of woody biomass, prevented its commercialization. Industrial waste blends, which are also mostly renewable, are suitable feedstock for torrefaction, and can be an economically viable solution, thus may prolong the life of some of the existing coal power plants in the U.S. This paper focuses on the torrefaction dynamics of paper fiber-plastic waste blend of 60% fiber and 40% plastic and the characterization of its torrefied product as a function of extent of reaction (denoted by mass loss). Two forms of the blend are used, one is un-densified and the other is in the form of pellets with three times the density of the un-densified material. Torrefaction of these blends was conducted at 300 • C in the mass loss range of 0-51%. The torrefied product was characterized by moisture content, grindability, particle size distribution, energy content, molecular functional structure, and chlorine content. It was shown that although torrefaction dynamics is of the two forms differs significantly from each other, their properties and composition depend on the mass loss. Fiber content was shown to decrease relative to plastic upon the extent of torrefaction. Further, the torrefied product demonstrates a similar grinding behavior to Powder River Basin (PRB) coal. Upon grinding the fiber was concentrated in the smaller size fractions, while the plastic was concentrated in the larger size fractions.

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Section: Torrefactionmentioning

confidence: 99%

Properties of Torrefied U.S. Waste Blends

Zinchik

Kolapkar

et al. 2018

Front. Energy Res.

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“…In addition, it appears advisable to consider this model compound in order to compare our results with those obtained in Ref. [5].…”

Section: Model Assumptionsmentioning

confidence: 49%

“…Our goal is to basically solve a model relying on relatively simple assumptions with the aim of demonstrating general tendencies and to point out the important mistakes that can be committed according to the definitions of sample temperature and heating rate. In a recent article [5], the first general conclusions have been already reported in the case of thin and thick cellulose particles expected to react on the basis of a very simple kinetic model. For example, the kinetic pathway is represented by a simple elementary process of the type: cellulose → products.…”

Section: Simplified Pyrolysis Modelingmentioning

confidence: 88%

“…More attention will be devoted to the cases of temperature and heating rate, usually considered by the authors. These parameters will be evaluated on the basis of a simplified pyrolysis model and of the conclusions of a recent other paper [5]. Afterwards, we shall consider other parameters: particle size, available heat flux density, heat transfer coefficient, efficiency of products removal/ elimination, etc.…”

Section: Difficulties In Defining the Operating Conditionsmentioning

confidence: 99%

“…These two experimental devices are mainly encountered at the laboratory scale and operate with powdery samples. They have been discussed elsewhere [5]. -The kinetic pathway ( Fig.…”

Section: Model Assumptionsmentioning

confidence: 99%

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Characterization of biomass fast pyrolysis

Lédé

Authier

2011

Biomass Conv. Bioref.

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The literature shows that different possible criteria are used for defining biomass fast pyrolysis. On the basis of a simplified modeling of a cellulose (biomass model compound) particle pyrolysis, the present paper points out that the most often considered parameters (i.e., temperature and heating rate) are inappropriate. They are very difficult to define and measure, and according to their definitions, important errors can be made (kinetic measurements and reactor scaling up). Other possible parameters are also examined such as particle initial size, available heat flux density, heat transfer coefficient, and products elimination efficiency. In order to be able to compare different experimental conditions on a similar basis, it is shown that at the biomass sample level, fast pyrolysis is favoured (enhancement of bio-oil fractions) if two necessary conditions are simultaneously fulfilled. They include high external heat transfer coefficient and efficient products removal.

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Bibliography

2016

Thermochemical Conversion of Biomass for the Production of Energy and Chemicals

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Biomass Pyrolysis: Comments on Some Sources of Confusions in the Definitions of Temperatures and Heating Rates

Cited by 53 publications

References 18 publications

Properties of Torrefied U.S. Waste Blends

Properties of Torrefied U.S. Waste Blends

Characterization of biomass fast pyrolysis

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