A fundamental research on synchronized torrefaction and pelleting of biomass

Yang, Yang; Sun, Mingman; Zhang, Meng; Zhang, Ke; Wang, Donghai; Lei, Catherine

doi:10.1016/j.renene.2019.04.112

Cited by 50 publications

(20 citation statements)

References 28 publications

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“…Peng et al [7] studied the effects of the wood torrefaction process on the resulting energy density and hardness. Yang et al [8] developed a synchronized torrefaction and pelleting process at the laboratory scale and compared their results with previous processes such as torrefaction after pelletizing (TAP) or pelletizing after torrefaction (PAT). Oh et al [9] developed and validated a mass reduction model for agro-byproducts (pepper stem) and determined the optimized torrefaction conditions.…”

Section: Of 14mentioning

confidence: 99%

Characteristic Analysis of Torrefied Pellets: Determining Optimal Torrefaction Conditions for Agri-Byproduct

Park

Kim

et al. 2020

Energies

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This study considers the possibility of utilizing agri-byproducts as energy sources via pelletization and torrefaction. Pellets were placed in a capsule and torrefied in an electrical furnace. Subsequently, they were cooled for 30 min, and their mass loss was measured. To investigate the resulting changes in fuel characteristics, ultimate and proximate analyses were performed, and calorific values were measured. To estimate the water absorption of the pellets, hygroscopicity evaluations were conducted. Based on the experimental results, the energy yield, lower heating value, and exergy were calculated to determine the optimum conditions for torrefaction. The calculation was performed by utilizing the useful exergy and standards applied to biomass power plants. We determined that torrefaction for agro-pellets should be conducted under low-to-intermediate temperatures (210–250 °C) within a period of 50 min. Under these conditions, 7–55% mass reductions were observed, the higher heating value increased from 4110 to 6880 kcal kg−1, and the lower heating value changed from 3780 to 6520 kcal kg−1 owing to reduced hygroscopicity. So, Agro-byproducts can contribute to the practical application by improving the heating value through torrefaction as an alternative to wood pellets.

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Section: Of 14mentioning

confidence: 99%

Characteristic Analysis of Torrefied Pellets: Determining Optimal Torrefaction Conditions for Agri-Byproduct

Park

Kim

et al. 2020

Energies

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“…Due to these characteristics, the cost of handling, transportation, and storage of the raw biomass is relatively high. Moreover, the thermal conversion of raw biomass results in lower energy efficiency during thermal conversion (Ramamurthi et al 2014;Mostafa et al 2019;Yang et al 2019). Over the last decade, different biomass processing technologies have been developed to overcome the energy related issues of raw biomass (Chew and Doshi 2011;Van der Stelt et al 2011).…”

Section: Effect Of Extractives On the Physicochemical Properties Of Bmentioning

confidence: 99%

Effect of extractives on the physicochemical properties of biomass pellets: Comparison of pellets from extracted and non-extracted sycamore leaves

Liu

Chen

Jiang

et al. 2019

BioRes

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Physicochemical properties of biomass pellets were compared following their preparation from extracted and non-extracted sycamore leaves. The goal was to achieve high-quality biomass pellets. Batches of pellets were prepared at different moisture contents and pressure. The properties, including pellet density, diametric compressive strength, and combustion performance, were analyzed. Pellets produced from extracted leaves had higher pellet density (between 1125 and 1250 kg·m-3) compared to those made from non-extracted leaves. In addition, data of the combustion experiment showed more weight loss in extracted leaves’ pellets and a higher burning rate (9.54%·min-1) than that of non-extracted leaves’ pellets (8.47%·min-1). Also, the pellets made from extracted leaves could be ignited and burned easily compared to non-extracted leaves. However, the diametric compressive strength was not always higher in extracted leaves’ pellets compared to non-extracted. In general, it was concluded that extraction could increase the pellet density and improve combustion performance but did not fit the purpose to increase the diametric compressive strength. The analysis and conclusions can provide a reference for the production of high-quality biomass pellets.

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“…Torrefaction process (mild pyrolysis) is defined as the roasting of the biomass product for variable residence times at approximately 200-300 °C in an oxygen-free environment, generally at atmospheric pressure [8]. Torrefaction is an application in which oxygen and other volatile substances are removed from the biomass product, increasing the efficiency of transport and storage together with the bulk density and energy density of the biomass [9].…”

Section: Introductionmentioning

confidence: 99%

“…The torrefaction process can be applied to different physical forms of biomass. Yang et al [9] and Misljenovic et al [10] stated that the torrefaction of raw biomass provides advantages in storage due to its hydrophobic feature and has higher energy and volumetric density compared to untreated biomass. However, Larsson et al [11] reported that the compression process became difficult since the product obtained as a result of the torrefaction process applied to the ground biomass had particles with a rigid structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Torrefaction Conditions on Physical and Thermal Properties of High- and Low- Quality Palm Pruning Residue Pellets

et al. 2021

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Torrefaction is a promising method to improve the fuel quality of pellets. In this study, palm pruning residues were used as an alternative to forest products. Torrefaction was applied to high-quality (HQ) and low-quality (LQ) pellets at 220, 235, and 250 °C for 5, 10, and 15 min in a newly developed lab-scaled torrefaction system. Torrefaction temperature and residence time adversely affected the physical properties of HQ and LQ pellets. Particle density of untreated HQ and LQ pellets were 1172 kg/m 3 and 757 kg/m 3 , respectively, decreased to 1059 kg/m 3 and 668 kg/m 3 at upper conditions (250 °C and 15 min). The durability index at upper conditions decreased from 99.02 to 98.13% and from 89.89 to 74.82% for HQ and LQ pellets, respectively. Heterogeneous and poorly physically structured LQ pellets showed non-homogeneous changes in thermal and physical properties. The HHVs of untreated pellets were increased from 18.4 to 20.3 MJ/kg for HQ pellets and 18.2 to 18.9 MJ/kg for LQ pellets at upper conditions. Pellets with high physical quality were torrefied more efficiently than those with low physical quality. Under the same conditions, LQ pellets were measured to be lighter in color than HQ pellets. Accordingly, it is thought that based on the color darkening caused by torrefaction, predictions can be made about the physical properties of the pellet and the torrefaction efficiency.

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A fundamental research on synchronized torrefaction and pelleting of biomass

Cited by 50 publications

References 28 publications

Characteristic Analysis of Torrefied Pellets: Determining Optimal Torrefaction Conditions for Agri-Byproduct

Characteristic Analysis of Torrefied Pellets: Determining Optimal Torrefaction Conditions for Agri-Byproduct

Effect of extractives on the physicochemical properties of biomass pellets: Comparison of pellets from extracted and non-extracted sycamore leaves

Effect of Torrefaction Conditions on Physical and Thermal Properties of High- and Low- Quality Palm Pruning Residue Pellets

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