Effect of a mild torrefaction for production of eucalypt wood briquettes under different compression pressures

Araújo, Solange de Oliveira; Boas, Mariana Almeida Vilas; Neiva, Duarte; Carneiro, Angélica de Cássia Oliveira; Vital, Benedito Rocha; Breguez, Marcelino; Pereira, Helena

doi:10.1016/j.biombioe.2016.04.007

Cited by 45 publications

(37 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Their utilization, especially in rural communities, is basically as direct fuel, while their disposal is by open burning or being dumped and left to rot on farmlands. Generally, biomass display poor energy characteristics when used in their natural state [8,9]. They also show low bulk densities due to their porous structure which makes processing, shipping, storage and combustion difficult [10].…”

Section: Introductionmentioning

confidence: 99%

Production and Characterization of Hybrid Briquettes from Corncobs and Oil Palm Trunk Bark under a Low Pressure Densification Technique

et al. 2020

View full text Add to dashboard Cite

The objective of this research was to investigate the quality of hybrid briquettes developed from corncobs (CC) and oil palm trunk bark (OPTB) under a low-pressure densification technique. The materials were combined in varying ratios of CC to OPTB (100:0, 75:25, 50:50, 25:75, 0:100) and wastepaper pulp (10% by weight) was added to each mixture as a binder. The briquettes were produced using a manually operated 20-tonne hydraulic piston press at 28 °C temperature and ≤7 MPa compaction pressure. The mechanical strength of the briquettes was determined by the drop test and compression test methods, while a bomb calorimeter was used to determine the calorific values. The results showed that the physical properties of hybrid briquettes ranged from 9.24–10.00% moisture content, 0.38–0.40 g/cm3 density, and 87.60%–92.00% water resistance. Mechanical strength showed a 98.28%–99.08% shatter index and 18.47–21.75 MPa compressive strength, while calorific values ranged from 16.54–16.91 MJ/kg. The hybrid briquettes fared better than the CC briquettes. The significance of this study lies in the production of briquettes with suitable physical, mechanical and thermal properties by utilizing OPTB which have hitherto not been used, mixed with corncobs. This could bring substantial environmental and socio-economic benefits to rural communities of the developing countries.

show abstract

Section: Introductionmentioning

confidence: 99%

Production and Characterization of Hybrid Briquettes from Corncobs and Oil Palm Trunk Bark under a Low Pressure Densification Technique

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Araújo et al (2016) used wood particles of Eucalyptus grandis and Eucalyptus spp. to form briquettes using pressing at 120 °C for 7 min and 6 min cooling time, under pressures of 6.9, 10.3, and 13.8 MPa.…”

Section: Introductionmentioning

confidence: 99%

High-Pressure Treatment of Chinese Fir Wood: Effect on Density, Mechanical Properties, Humidity-Related Moisture Migration, and Dimensional Stability

Li¹,

Zhang²,

Ramaswamy³

et al. 2016

BioResources

View full text Add to dashboard Cite

A new densification technique for industrial uses of plantation wood was studied. Chinese fir wood was treated by high pressure (HP) at 50 to 200 MPa for 5 min. The density and mechanical properties, moisture sorption isotherm (MSI), and dimensional changes of the pressure-treated wood under various relative humidity (RH) storage conditions were evaluated. The densities of HP-treated wood ranged from 0.79 ± 0.01 g/cm 3 after treatment at 50 MPa to 0.92 ± 0.02 g/cm 3 at 200 MPa, which was significantly higher (p < 0.05) than that of the control (0.35 ± 0.01 g/cm 3 ). Hardness values in radial and tangential fiber alignment faces also significantly increased by 370% to 470% and 350% to 460%, respectively, as compared with the control. The modulus of elasticity and the modulus of rupture of pressure-treated wood increased by 48% to 88% and 89% to 170%, respectively. The equilibrium moisture content varied with RH, decreasing slightly at 33% and 52% while significantly increasing (p < 0.001) at 86% and 93% RH. Radial, tangential, and volumetric dimensions of densified wood were relatively stable at 33%, 52%, and 67% RH, while remarkable swelling occurred at 86% and 93% RH.

show abstract

“…The briquetting of torrefied biomass is less expensive than pelleting due to low capital and operating and maintenance costs of briquetting equipment. In addition, briquette presses can handle larger particle sizes, wider moisture contents, and better feed handling [21]. The data on briquetting characteristics of torrefied biomass in a pilot scale mechanical briquettes press is scarce or not available.…”

mentioning

confidence: 99%

An “In-Situ Binding” Approach to Produce Torrefied Biomass Briquettes

et al. 2019

View full text Add to dashboard Cite

Biomass-derived coal or “biocoal” produced using a torrefaction process presents a carbon-neutral option of coal for power generation. While torrefaction delivers a carbon content and hydrophobicity comparable to coal, it lowers its density and creates material handling, storage, and transportation challenges. Densification into briquettes would help mitigate these challenges. However, the torrefied biomass is difficult to densify and may require the use of binders, which are expensive and can be incompatible with respect to material and emissions. A cost-effective approach to utilize lignin in-situ of the biomass to promote binding during densification was demonstrated using a pilot-scale briquetter unit during this study. Lignin, a cross-linked polymer, tends to break down and lose its binding ability under high-temperature conditions of torrefaction. In this paper, we investigated the use of a lightly torrefied material as a binder―LTM (biomass torrefied in the transition region of non-reactive and reactive temperature ranges of torrefaction). When mixed with torrefied biomass and densified together under suitable moisture and temperature conditions, the lignin is shown to mobilize and provide binding to the briquettes. The results showed that briquettes produced using LTM as binder and 10% to 11% moisture provided in-situ binding, improved density and durability, and produced hydrophobic briquettes.

show abstract

Effect of a mild torrefaction for production of eucalypt wood briquettes under different compression pressures

Cited by 45 publications

References 13 publications

Production and Characterization of Hybrid Briquettes from Corncobs and Oil Palm Trunk Bark under a Low Pressure Densification Technique

Production and Characterization of Hybrid Briquettes from Corncobs and Oil Palm Trunk Bark under a Low Pressure Densification Technique

High-Pressure Treatment of Chinese Fir Wood: Effect on Density, Mechanical Properties, Humidity-Related Moisture Migration, and Dimensional Stability

An “In-Situ Binding” Approach to Produce Torrefied Biomass Briquettes

Contact Info

Product

Resources

About