Modeling the impact of bubbling bed hydrodynamics on tar yield and its fluctuations during biomass fast pyrolysis

Xiong, Qingang; Xu, Fei; Ramirez, Emilio; Pannala, Sreekanth; Daw, C. Stuart

doi:10.1016/j.fuel.2015.09.074

Cited by 75 publications

(24 citation statements)

References 37 publications

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“…They observed that the trends in tar yield variability were complex and difficult to predict. In addition, the standard deviation in tar yield enhanced by the increases in initial bed height in freely bubbling state and became the maximum in slugging state [249] . Geometrical optimisation of a fast pyrolysis bubbling fluidised bed reactor was studied by Papadikis et al To optimise the condition, they used CFD.…”

Section: Bubbling Fluidised Bedsmentioning

confidence: 98%

Biomass pyrolysis: A review of the process development and challenges from initial researches up to the commercialisation stage

Gholizadeh

2019

Journal of Energy Chemistry

500

216

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Section: Bubbling Fluidised Bedsmentioning

confidence: 98%

Biomass pyrolysis: A review of the process development and challenges from initial researches up to the commercialisation stage

Gholizadeh

2019

Journal of Energy Chemistry

500

216

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“…By pretreating organic matter in solution using different ultrasonic power levels, Jiang et al [20] demonstrated that the effects of ultrasound on the biomass are similar when the biomass is treated using low-intensity power over a long period or with high-intensity power over a short period. Other studies have indicated that combinations of high-intensity ultrasound and chemical methods can increase the efficiency of biomass pretreatment [18,[21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Identification of acoustic fields in aqueous biomass solutions of banana waste pretreated by power ultrasound

Vélez

Cornélio

Corrêa

et al. 2017

Biomass Conv. Bioref.

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High-intensity ultrasound is a technology used to improve the performance of processes in the chemical, pharmaceutical, biomass pretreatment, and food industries. However, few studies were described in the literature to comprehend the acoustic wave propagation in the material and their efficiency in the process. Thus, this study aims to determine the acoustic fields of aqueous biomass solutions from flower stalk banana using the calorimetric method and a determined sonotrode position. These tests were conducted at temperatures from 0 to 60°C and ultrasound power from 120, 160, to 320 W. Also, the specific heat capacity and density of the solution were determined experimentally as a function of the solution concentration (0.040 to 0.100 g biomass mL −1), pH (3, 5, and 7), and temperature. The position of the thermocouple was maintained at 1 cm from the sonotrode, and the ultrasound frequency was 24 kHz. The methods and results presented in this study can be used to reproduce acoustic field calculations in aqueous biomass solutions, aiming the construction of acoustic processor systems.

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“…Numerical simulation [18][19][20] has been performed on the melting process of waxy crude oil in an oil tank in the framework of Finite Volume Method in this paper. The velocity and pressure are coupled by SIMPLE algorithm [18] .…”

Section: Methodsmentioning

confidence: 99%

Numerical investigation of melting of waxy crude oil in an oil tank

Wang

Zhang

et al. 2017

Applied Thermal Engineering

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：A safe and economic waxy crude oil melting scheme is an important issue in oil tank storage, and thus a better understanding of the melting mechanism of waxy crude oil in the tank is necessary to develop a scientific scheme for melting. With the consideration of wax precipitation and non-Newtonian behavior, this paper establishes physical and mathematical models for melting process of waxy crude oil in the tank, and then develops an integrative numerical procedure for the coupling of physical process within wax crystal porous media, solid-liquid dispersion system and pure liquid waxy crude oil. In this research, the non-Newtonian behavior is described by the power-law equation. The melting process is simulated by the enthalpy-porous media theory. The melting characteristics of waxy crude oil in the tank with Pr=354.3, Ra=1.0×10 6 and Ste=0.371 is investigated. Particularly, the effects of wax precipitation and non-Newtonian behavior are analyzed in detail. The results show that, during melting, the heat flux varies at different stages under different wax precipitation scenarios. At the initial melting stage, heat flux decreases with the increase of the wax precipitation, and in the natural convection melting stage, heat flux increases with the increase of wax precipitation. The effect of non-Newtonian behavior on melting process is influenced by the permeability constant of wax crystal porous media. When the permeability constant is small, non-Newtonian behavior has little effect on the melting process. Conversely, when the permeability constant is large, strengthening the non-Newtonian behavior will slow down the melting process.

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Modeling the impact of bubbling bed hydrodynamics on tar yield and its fluctuations during biomass fast pyrolysis

Abstract: The impact of bubbling bed hydrodynamics on temporal variations in the exit tar yield for biomass fast pyrolysis was investigated using computational simulations of an experimental laboratory-scale reactor. A multi-fluid computational fluid dynamics model was employed to

Cited by 75 publications

References 37 publications

Biomass pyrolysis: A review of the process development and challenges from initial researches up to the commercialisation stage

Biomass pyrolysis: A review of the process development and challenges from initial researches up to the commercialisation stage

Identification of acoustic fields in aqueous biomass solutions of banana waste pretreated by power ultrasound

Numerical investigation of melting of waxy crude oil in an oil tank

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