Pilot scale oxidative fast pyrolysis of sawdust in a fluidized bed reactor: A biorefinery approach

Karmee, Sanjib Kumar; Kumari, Geeta; Soni, Bhavin

doi:10.1016/j.biortech.2020.124071

Cited by 26 publications

(4 citation statements)

References 40 publications

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“…Partial oxidation allows the process to be carried out in an auto-or exothermic mode, i.e. to reduce power inputs, or even -to receive heat energy, and the use of catalysts -more efficiently control the process direction [11]. However, currently, catalysts are rarely used for biomass pyrolysis in a fluidized bed.…”

Section: Introductionmentioning

confidence: 99%

“…However, currently, catalysts are rarely used for biomass pyrolysis in a fluidized bed. Except zeolite ZSM-5 that utilized to increase the yield of fast pyrolysis oil [11,12], there are practically no other examples of utilization of catalysts of other formulations. Therefore, the search and application of more suitable and stable catalytic systems is urgent.…”

Section: Introductionmentioning

confidence: 99%

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Green approach to production of porous char adsorbents via oxidative carbonization in fluidized catalyst bed

Yeletsky,

Yazykov,

Dubinin

et al. 2024

Nanosystems: Phys. Chem. Math.

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A green and energy-efficient technique for production of porous carbon-mineral chars from agricultural wastes (rice husk, wheat bran) and sedimentary carbonaceous feedstocks (high-ash peat, coal) was developed. It is based on partial combustion in fluidized bed of a deep oxidation catalyst at low temperatures (465 -600 • C). This technique yields porous chars with an elevated mineral content that depends on a feedstock used, and gaseous products of complete oxidation. It was found that the obtained chars have developed porosity with BET specific surface area of ca. 50 -170 m 2 g −1 , pore volume of 0.05 -0.17 ml•g −1 , and ash content of 16 -79 wt. %. They were additionally characterized by TGA and FTIR. Their testing as adsorbents for heavy metal ions (by the example of Cu 2+ ) and organic dyes (by the example of methyl green) revealed that their adsorption capacities are comparable to those of chars produced by the conventional pyrolytic approaches. KEYWORDS biochar, biomass, rice husk, bran, fluidized catalyst bed, composite

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Green approach to production of porous char adsorbents via oxidative carbonization in fluidized catalyst bed

Yeletsky,

Yazykov,

Dubinin

et al. 2024

Nanosystems: Phys. Chem. Math.

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“…Currently, most of the actions focusing on GHG emission reduction aim to reduce fossil fuel consumption, yet barely address the capturing of carbon dioxide released by fossil fuel combustion. Furthermore, some of these actions target activities in line with agricultural practices [1][2][3]. Despite some local achievements in decreasing emissions, the global emissions continue to increase.…”

Section: Introduction 1necessity Of the Mattermentioning

confidence: 99%

Development and Comparison of Thermodynamic Equilibrium and Kinetic Approaches for Biomass Pyrolysis Modeling

2022

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Biomass pyrolysis is considered as a thermochemical conversion system that is performed under oxygen-depleted conditions. A large body of literature exists in which thermodynamic equilibrium (TE) and kinetic approaches have been applied to predict pyrolysis products. However, the reliability, accuracy and predictive power of both modeling approaches is an area of concern. To address these concerns, in this paper, two new simulation models based on the TE and kinetic approaches are developed using Aspen Plus, to analyze the performance of each approach. Subsequently, the results of two models are compared with modeling and experimental results available in the literature. The comparison shows that, on the one hand, the performance of the TE approach is not satisfactory and cannot be used as an effective way for pyrolysis modeling. On the other hand, the results generated by the new model based on the kinetic approach suggests that this approach is suitable for modeling biomass pyrolysis processes. Calculation of the root mean square error (RMS), to quantify the deviation of the model results from the experiment results, confirms that this kinetic model presents superior agreement with experimental data in comparison with other kinetic models in the literature. The acquired RMS for the developed kinetic method in this paper varies within the span of 1.2 to 3.2 depending on temperature (400–600 °C) and various feedstocks (pine spruce sawdust, bagasse, wood bark, beech wood and paddy straw).

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“…Continuous, steady-state processes are easier to perform at a larger scale; however, relatively few pilot-scale facilities are available because the capital and operating costs are higher than those of laboratory systems and securing large quantities (100s of kg) of precommercial feedstock and catalyst is challenging. Pilot-scale units need to be flexible enough to investigate how to overcome technical barriers but the impact of feedstock variability and process conditions on process performance will likely be limited to a subset of parameters compared to what would be screened in smaller laboratory systems. − Nevertheless, pilot-scale catalytic biomass pyrolysis studies are critical for validating laboratory results to support technology scale-up and providing input from a scalable process for technoeconomic analyses that extrapolate technical feasibility and economic viability of advanced biofuels pathways to commercial scale. , …”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on the Pilot-Scale Catalytic Pyrolysis of Loblolly Pine

2021

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A pilot-scale biomass catalytic pyrolysis unit with a nominal throughput of one tonne of biomass per day (1TPD) has been in operation since 2013 to investigate the process parameters that have the largest influence on biocrude yield, oxygen content, and chemical composition. A parametric study was conducted to investigate the effect of pyrolysis temperature, ranging from 433 to 581 °C, on biocrude yield and quality. A locally sourced loblolly pine feedstock and a commercially available, spray dried, nonzeolitic γ-Al2O3 catalyst were used in individual experiments conducted at each pyrolysis temperature to achieve a minimum of 4 h of steady-state continuous operation. Typically, 600–800 kg of biomass was fed over a 12-h period, with one experiment extended to almost 29 h (1144-kg biomass fed) and one experiment interrupted by a process upset after just 7 h (411-kg biomass fed). Comprehensive analysis of collected gas, liquid, and solid products were used to calculate carbon balances (77% to 107%) for each experiment. The biocrude yield ranged from 12 to 18 wt % C and, in general, decreased with increasing pyrolysis temperature. The average steady-state biocrude yield as a function of temperature translated to a biocrude production rate between 40 and 50 gallons per dry ton. The biocrude oxygen content varied between 21 and 31 wt %, on a dry basis, and as expected, decreased with increasing pyrolysis temperature. The identified components in the semivolatile biocrude products are mostly methoxyphenols and other multiphenolic compounds. The multiphenolic compounds are demethoxylated at pyrolysis temperatures above 500 °C, producing biocrudes with higher concentrations of monophenols and polycyclic aromatic hydrocarbons. The concentration of anhydrosugars, like levoglucosan in the biocrudes, decreased with increasing pyrolysis temperature from ∼15 to ∼1 vol %.

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Pilot scale oxidative fast pyrolysis of sawdust in a fluidized bed reactor: A biorefinery approach

Cited by 26 publications

References 40 publications

Green approach to production of porous char adsorbents via oxidative carbonization in fluidized catalyst bed

Green approach to production of porous char adsorbents via oxidative carbonization in fluidized catalyst bed

Development and Comparison of Thermodynamic Equilibrium and Kinetic Approaches for Biomass Pyrolysis Modeling

Effect of Temperature on the Pilot-Scale Catalytic Pyrolysis of Loblolly Pine

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