Evaluation of fast pyrolysis feedstock conversion with a mixing paddle reactor

Zinchik, Stas; Klinger, Jordan; Westover, Tyler L.; Donepudi, Yash; Hernández, Sergio; Naber, Jeff; Bar‐Ziv, Ezra

doi:10.1016/j.fuproc.2017.11.012

Cited by 16 publications

(17 citation statements)

References 33 publications

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“…In this case, it was possible that in the time frame of the experiment, diffusion of HCl from the solid phase was so slow that it was not released during the experiment. However, in previous experiments by Bar-Ziv and Saveliev (2013), the material was torrefied in a stirred reactor (Zinchik et al, 2018) using much smaller size particles (∼1 mm) than in the present study and clearly showed that HCl was released.…”

Section: Chlorine Removalcontrasting

confidence: 54%

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: Chlorine Removalcontrasting

confidence: 54%

Properties of Torrefied U.S. Waste Blends

Zinchik

Kolapkar

et al. 2018

Front. Energy Res.

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“…While clean chips of poplar and willow have been identified to have favorable carbohydrate contents for biochemical conversion processes (Volk et al, 2006;Sannigrahi et al, 2010), excessive leaf and bark material can negatively impact conversion (Wyman et al, 2009;Dou et al, 2017b). Additionally, higher lignin content of leaves and bark is a compositional aspect that should be considered, high lignin lends itself to thermochemical conversion processes; conversely, the higher ash contents in bark and leaves may cause problems with high temperature conversion (Carpenter et al, 2017;Zinchik et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Preprocessing and Hybrid Biochemical/Thermochemical Conversion of Short Rotation Woody Coppice for Biofuels

et al. 2018

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Preprocessing with air classification, followed by a hybrid biochemical/thermochemical conversion scheme, was utilized to improve the quality of short rotation woody coppice (SRWC) for biofuels production. Air classification improved sugar release during enzymatic hydrolysis by 6-12% for poplar and willow coppice respectively. Total theoretical sugar release for these hardwood coppices was ∼70%, which suggests that they could be utilized for biochemical conversion. Improved sugar yields after air classification were tied to compositional changes of reduced ash and extractives which can neutralize dilute acid pretreatment and inhibit fermentation. However, air classification was shown to have little to no effect on pyrolytic thermochemical conversion as it removed material without returning a significant improvement in liquid yield. It was also shown that pyrolysis of biochemical conversion lignin rich residue gives liquid yields comparable to whole tree (without any fractionation) pyrolysis, with a higher quality oil that has ∼60% reduced total acid number. Using this combined biochemical/thermochemical conversion strategy can improve yields of fermentable sugars and pyrolysis liquid above 80%, instead of the 60% yield of sugars or bio-oil when using a single conversion strategy. Overall, it has been shown that preprocessing and hybrid conversion pathways are a viable strategy for maximizing biorefinery viability.

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“…The main reactors used in fast pyrolysis are based on circulating fluidized bed (CFB) reactors [14]. Recently the MTU group has developed a paddle reactor that yieled the same yields as CFB [53], however, it is much simpler and at signficantly lower cost. This reactor will be used in this study.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In auger reactor and paddle reactors pyrolysis (described in detail in 3.2.2), the feedstock is continuously fed to a screw/paddle and rotation of screw moves the product to the end of the screw through various heating zones. They are gaining popularity because of their simplicity of construction and operation [53]. These reactor also need little or no carrier gas thus reducing operational needs.…”

Section: The Paddle Reactormentioning

confidence: 99%

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Pyrolysis of Fiber-Plastic Waste Blends

Kolapkar¹

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Evaluation of fast pyrolysis feedstock conversion with a mixing paddle reactor

Cited by 16 publications

References 33 publications

Properties of Torrefied U.S. Waste Blends

Properties of Torrefied U.S. Waste Blends

Preprocessing and Hybrid Biochemical/Thermochemical Conversion of Short Rotation Woody Coppice for Biofuels

Pyrolysis of Fiber-Plastic Waste Blends

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