Comparison of multi-component kinetic relations on bubbling fluidized-bed woody biomass fast pyrolysis reactor model performance

Matta, Johnny; Bronson, Benjamin; Gogolek, Peter; Mazerolle, Dillon; Thibault, Jules; Mehrani, Poupak

doi:10.1016/j.fuel.2017.08.092

Cited by 16 publications

(4 citation statements)

References 57 publications

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“…Although using the lumped reaction schemes is straightforward, the predictability of the product yields using numerical simulations is strongly dependent on the accuracy of the reaction kinetics. Thus, in recent years, some research has been performed considering comprehensive and relatively complex reaction kinetics [73,74].…”

Section: Chemical Kinetics Of a Single Biomass Particlementioning

confidence: 99%

Parametric analysis of pyrolysis process on the product yields in a bubbling fluidized bed reactor

Jalalifar

Garaniya

Hawboldt

et al. 2018

Fuel

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This paper presents a numerical study of operating factors on the product yields of a fast pyrolysis process in a 2-D standard lab-scale bubbling fluidized bed reactor. In a fast pyrolysis process, oxygen-free thermal decomposition of biomass occurs to produce solid biochar, condensable vapours and non-condensable gases. This process also involves complex transport phenomena and therefore the Euler-Euler approach with a multifluid model is applied. The eleven species taking part in the process are grouped into a solid reacting phase, condensable/non-condensable phase, and non-reacting solid phase (the heat carrier). The biomass decomposition is simplified to ten reaction mechanisms based on the thermal decomposition of lignocellulosic biomass. For coupling of multi-fluid model and reaction rates, the time-splitting method is used. The developed model is validated first using available experimental data and is then employed to conduct the parametric study. Based on the simulation results, the impact of different operating factors on the product yields are presented. The results for operating temperature (both sidewall and carrier gas temperature) show that the optimum temperature for the production of bio-oil is in the range of 500-525°C. The higher the nitrogen velocity, the lower the residence time and less chance for the secondary crack of condensable vapours to non-condensable gases and consequently higher bio-oil yield. Similarly, when the height of the biomass injector was raised, the yields of condensable increased and non-condensable decreased due to the lower residence time of biomass. Biomass flow rate of 1.3 kg/h can produce favourable results. When larger biomass particle sizes are used, the intraparticle temperature gradient increases and leads to more accumulated unreacted biomass inside the reactor and the products' yield decreases accordingly. The simulation indicated that the larger sand particles accompanied by higher carrier gas velocity are favourable for bio-oil production. Providing a net heat equivalent of 6.52 watts to the virgin biomass prior to entering the reactor bed leads to 7.5 % higher bio-oil yields whereas other products' yields stay steady. Results from different feedstock material show that the sum of cellulose and hemicellulose content is favourable for the production of bio-oil whereas the biochar yield is directly related to the lignin content.

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Section: Chemical Kinetics Of a Single Biomass Particlementioning

confidence: 99%

Parametric analysis of pyrolysis process on the product yields in a bubbling fluidized bed reactor

Jalalifar

Garaniya

Hawboldt

et al. 2018

Fuel

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“…Raw biomass usually contains a high amount of moisture, and the drying process significantly impacts the overall process efficiency since evaporation consumes a large amount of energy. In previous studies, the drying process for high-temperature biomass thermochemical conversion processes has been modeled in three ways, i.e., first-order global evaporation model (Kersten et al, 2005;Xiong et al, 2013), equilibrium model (Di Blasi, 2008;Kabir et al, 2015), and heat sink model (Neves et al, 2011;Matta et al, 2017). The first approach is comparatively simple, and it considers that evaporation is a thermally activated process meaning drying begins only after reaching a specific boiling temperature.…”

Section: Dryingmentioning

confidence: 99%

Modeling of thermochemical conversion of waste biomass – a comprehensive review

et al. 2021

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Thermochemical processes, which include pyrolysis, torrefaction, gasification, combustion, and hydrothermal conversions, are perceived to be more efficient in converting waste biomass to energy and value-added products than biochemical processes. From the chemical point of view, thermochemical processes are highly complex and sensitive to numerous physicochemical properties, thus making reactor and process modeling more challenging. Nevertheless, the successful commercialization of these processes is contingent upon optimized reactor and process designs, which can be effectively achieved via modeling and simulation. Models of various scales with numerous simplifying assumptions have been developed for specific applications of thermochemical conversion of waste biomass. However, there is a research gap that needs to be explored to elaborate the scale of applicability, limitations, accuracy, validity, and special features of each model. This review study investigates all above mentioned important aspects and features of the existing models for all established industrial thermochemical conversion processes with emphasis on waste biomass, thus addressing the research gap mentioned above and presenting commercial-scale applicability in terms of reactor designing, process control and optimization, and potential ways to upgrade existing models for higher accuracy.

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“…The considered process scales by Ciesielski et al (2018) range from the atomistic scale to the reactor scale. Other contributions include Matta et al (2017) and Ranzi et al (2017a,b). Several comprehensive review papers have already been published on the subject biomass pyrolysis.…”

Section: Fast Pyrolysismentioning

confidence: 99%

Modeling Biowaste Biorefineries: A Review

Buck

Polańska

Impe

2020

Front. Sustain. Food Syst.

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The biorefining of biowaste is an upcoming novel strategy, but is mostly still in its conceptual phase. Biowaste biorefineries would allow (rural) communities to convert their biowaste into value-added biofuels, biochemical compounds, and fertilizers. Several different types of biowaste biorefineries have already been developed, but little to none of these designs are already commercially exploited. Their further development and commercial implementation is hampered by the high investment costs and risks, little trusts in its novel technologies, expected yields and profits, and operating reliability. Modeling these integrated processes, together with their supply chains, would allow for optimizing the considered biorefinery designs and coincidently speeding up the R&D-process. The optimized biorefinery designs and supply chains would additionally embed an increased amount of trust in potential investors in terms of the economic sustainability of the considered novel processes. Therefore, in this publication, a summary of existing biorefinery models is presented, together with supply chain network models. The discussed biorefinery models are categorized according to the conversion platform they use, being thermochemical, biological, or hybrid ones. Furthermore, the overall inherent advantages and disadvantages of all conversion platforms are summarized and a scope of further research needs is presented.

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Comparison of multi-component kinetic relations on bubbling fluidized-bed woody biomass fast pyrolysis reactor model performance

Cited by 16 publications

References 57 publications

Parametric analysis of pyrolysis process on the product yields in a bubbling fluidized bed reactor

Parametric analysis of pyrolysis process on the product yields in a bubbling fluidized bed reactor

Modeling of thermochemical conversion of waste biomass – a comprehensive review

Modeling Biowaste Biorefineries: A Review

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