Effect of torrefaction on properties of solid granulated fuel of different biomass types

Косов, В. Ф.; Синельщиков, В. А.; Sytchev, G. A.; Зайченко, В. М.

doi:10.1134/s0018151x14060170

Cited by 26 publications

(6 citation statements)

References 11 publications

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“…As a result of such heat treatment, the thermotechnical characteristics of biomass, as solid fuel, are improving. In particular, combustion heat is increasing and hydrophobic properties are appearing that leads to decreasing the hygroscopicity limit [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Exothermic effect during torrefaction

Faleeva

Синельщиков

Sytchev

et al. 2018

J. Phys.: Conf. Ser.

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Abstract. There are presented the results of investigation of exothermal effect taking place during torrefaction process. Experiments were carried out with the help of thermoanalyzer SDT Q600, that gives opportunity to use methods of differential thermogravimetric analysis and differential scanning calorimetry, and at the lab-scale installation modelling the columntype torrefaction reactor with indirect (through the wall) heating of processable raw material. It was ascertained the correspondence between the processes of thermal decomposition of basic organic components of wood (hemicellulose, cellulose and lignin) and the characteristic endoand exothermic peaks on the curve of effective heat capacity. It was shown that the exothermal effect accompanying thermal decomposition of hemicellulose, taking place during torrefaction, may lead to spontaneous heating of wood biomass to temperatures significantly exceeding the wall temperature.

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Section: Introductionmentioning

confidence: 99%

Exothermic effect during torrefaction

Faleeva

Синельщиков

Sytchev

et al. 2018

J. Phys.: Conf. Ser.

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“…Some studies show that peat can be upgraded thermally by various methods, i.e., torrefaction [18], pyrolysis [19], gasification [20], or hydrothermal carbonization [21]. Each process favors different input substrates, process conditions, and end products.…”

Section: Peat Thermal-upgrading Methodsmentioning

confidence: 99%

“…Some studies show the prospect of thermal peat upgrading to fuels (gases or solids) using the overmentioned processes [18][19][20][21]28]. Nevertheless, none of them focus on medical/cosmetic peat waste particularly.…”

Section: Peat Thermal-upgrading Methodsmentioning

confidence: 99%

Medical Peat Waste Upcycling to Carbonized Solid Fuel in the Torrefaction Process

2021

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Peat is the main type of peloid used in Polish cosmetic/healing spa facilities. Depending on treatment and origin, peat waste can be contaminated microbiologically, and as a result, it must be incinerated in medical waste incineration plants without energy recovery (local law). Such a situation leads to peat waste management costs increase. Therefore, in this work, we checked the possibility of peat waste upcycling to carbonized solid fuel (CSF) using torrefaction. Torrefaction is a thermal treatment process that removes microbiological contamination and improves the fuel properties of peat waste. In this work, the torrefaction conditions (temperature and time) on CSF quality were tested. Parallelly, peat decomposition kinetics using TGA and torrefaction kinetics with lifetime prediction using macro-TGA were determined. Furthermore, torrefaction theoretical mass and energy balance were determined. The results were compared with reference material (wood), and as a result, obtained data can be used to adjust currently used wood torrefaction technologies for peat torrefaction. The results show that torrefaction improves the high heating value of peat waste from 19.0 to 21.3 MJ × kg−1, peat main decomposition takes place at 200–550 °C following second reaction order (n = 2), with an activation energy of 33.34 kJ × mol−1, and pre-exponential factor of 4.40 × 10−1 s−1. Moreover, differential scanning calorimetry analysis revealed that peat torrefaction required slightly more energy than wood torrefaction, and macro-TGA showed that peat torrefaction has lower torrefaction constant reaction rates (k) than wood 1.05 × 10−5–3.15 × 10−5 vs. 1.43 × 10−5–7.25 × 10−5 s−1.

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“…The paper discusses the possibilities of improvements of consumer characteristics of these pellets by means of their thermal treatment carried out in oxygen-free gas atmosphere, the so-called torrefaction (or low-temperature pyrolysis) [3][4][5]. …”

Section: Introductionmentioning

confidence: 99%