Combined effects of torrefaction and pelletization parameters on the quality of pellets produced from torrefied biomass

Rudolfsson, Magnus; Borén, Eleonora; Pommer, Linda; Nordin, Anders; Lestander, Torbjörn A.

doi:10.1016/j.apenergy.2017.01.035

Cited by 80 publications

(49 citation statements)

References 51 publications

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“…In the species studied, MC pellet decreased when the torrefaction temperature increased, especially in torrefaction at 250 • C, which presented lower MC pellet in all species (Table 1); this torrefaction condition, therefore, could have potential in pellet manufacturing. The decreasing of water absortion with torrefaction temperature agrees with the results found by Rudolfsson et al [43] for pellets fabricated with biomass torrefied with scots pine and pellets fabricated with torrefied sawdust [33].…”

Section: Moisture Content and Moisture Absorptionsupporting

confidence: 82%

“…This occurs because during torrefaction, the thermal decomposition of the biomass occurs and large voids are formed in the cell wall that reduce their size at the time of densification, decreasing W abs through the pores as a result [43]. Other authors explain that higher W abs occurs because the component of biomass that has a greater capacity for moisture absorption is hemicellulose, while lignin shows low moisture absorption tendency [44].…”

Section: Moisture Content and Moisture Absorptionmentioning

confidence: 99%

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Physical and Compression Properties of Pellets Manufactured with the Biomass of Five Woody Tropical Species of Costa Rica Torrefied at Different Temperatures and Times

et al. 2017

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Abstract:The purpose of the biomass torrefaction and pelletizing processes is to increase its energy properties, be environmentally friendly, decrease shipping costs, and make handling easier. The objective of the present work is to evaluate the density, internal density variation by X-ray densitometry, moisture content, water absorption, and compression force of torrefied biomass pellets of five wood species (Cupressus lusitanica, Dipterix panamensis, Gmelina arborea, Tectona grandis, and Vochysia ferruginea) under three torrefaction temperature conditions (light, middle, and severe) and three torrefaction times (8, 10, and 12 min). The results showed that the bulk density of the pellets was 0.90-1.30 g/cm 3 . The density variation of the pellets was higher with torrefaction at 250 • C. The moisture content decreased with increasing torrefaction temperature from 3% to 1%. Water absorption was lower in the pellets torrefied at 250 • C. The compression force was lower in the pellets torrefied at 250 • C with approximate loads of 700 N. Based on the above results, it was concluded that pellets made with biomass torrefied at 200 • C have better energy properties and evaluated properties. According to these results, pellets fabricated with the torrefied biomass of tropical species can be used in stove, gas, and hydrogen production because the pellet presents adequate characteristics.

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Section: Moisture Content and Moisture Absorptionsupporting

confidence: 82%

Section: Moisture Content and Moisture Absorptionmentioning

confidence: 99%

Physical and Compression Properties of Pellets Manufactured with the Biomass of Five Woody Tropical Species of Costa Rica Torrefied at Different Temperatures and Times

et al. 2017

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“…There are still few data available on the quality of industrially produced torrefied biomass pellets, as there are still very few successful cases on an industrial scale [29,31,34,47,48]. However, there are already some documented cases of tests carried out involving the substitution of mineral coal in thermoelectric plants with pellets of torrefied biomass [49][50][51][52][53][54].…”

Section: Resultsmentioning

confidence: 99%

A Case Study about Biomass Torrefaction on an Industrial Scale: Solutions to Problems Related to Self-Heating, Difficulties in Pelletizing, and Excessive Wear of Production Equipment

Nunes

2020

Applied Sciences

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The search for different forms of biomass that can be used as an alternative to those more traditional ones has faced numerous difficulties, namely those related to disadvantages that the majority of residual forms present. However, these residual forms of biomass also have advantages, namely the fact that, by being outside the usual biomass supply chains for energy, they are usually much cheaper, and therefore contribute to a significant reduction in production costs. To improve the less-favorable properties of these biomasses, thermochemical conversion technologies, namely torrefaction, are presented as a way to improve the combustibility of these materials. However, it is a technology that has not yet demonstrated its full potential, mainly due to difficulties in the process of scale-up and process control. In this article it is intended to present the experience obtained over 5 years in the operation of a biomass torrefaction plant with an industrial pilot scale, where all the difficulties encountered and how they were corrected are presented, until it became a fully operational plant. This article, in which a real case study is analyzed, presents in a descriptive way all the work done during the time from when the plant started up and during the commissioning period until the state of continuous operation had been reached.

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“…Tais tecnologias têm sido cada vez mais aprimoradas, de modo a explorar ao máximo a eficiência da biomassa como alternativa energética (DODDAPANENI et al, 2016). Diferentes procedimentos têm sido investidos a fim de melhorar as propriedades físicas da biomassa sólida, dentre os quais os tratamentos mecânicos, tais como a peletização e a briquetagem, que resultam em um produto da biomassa homogêneo e de alta densidade energética (CHAO et al, 2015;IBRAHIM et al, 2013;CHEN et al, 2017;RUDOLFSSON et al, 2017). Outro tratamento aplicado para o condicionamento da biomassa é a torrefação.…”

Section: Introductionunclassified

Estudo do processo de torrefação de resíduos de biomassas para fins energéticos

Silva

Santos

Bandeira

et al. 2017

Rev. Bras. Ciênc. Ambient. (Online)

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Combined effects of torrefaction and pelletization parameters on the quality of pellets produced from torrefied biomass

Cited by 80 publications

References 51 publications

Physical and Compression Properties of Pellets Manufactured with the Biomass of Five Woody Tropical Species of Costa Rica Torrefied at Different Temperatures and Times

Physical and Compression Properties of Pellets Manufactured with the Biomass of Five Woody Tropical Species of Costa Rica Torrefied at Different Temperatures and Times

A Case Study about Biomass Torrefaction on an Industrial Scale: Solutions to Problems Related to Self-Heating, Difficulties in Pelletizing, and Excessive Wear of Production Equipment

Estudo do processo de torrefação de resíduos de biomassas para fins energéticos

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