Mineral matter effects in rapid pyrolysis of beech wood

Nikazar, Manouchehr; Hajaligol, Mohammad R.; Sohrabi, Morteza; Dabir, Bahram

doi:10.1016/s0378-3820(96)01074-0

Cited by 116 publications

(79 citation statements)

References 14 publications

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“…The reduced char yield for the leached wheat straw char in comparison to the untreated wheat straw is consistent with the hypothesis that K catalyzes the repolymerization and cross-linking reactions to char, as observed also by Jensen et al [33] and Nik-Azar et al [34]. The high level of potassium in the wheat straw and alfalfa straw may catalyze the conversion of bridges into char link, promoting faster devolatilization rates and suppressing tar formation [35], leading to the higher char yields.…”

Section: Effect Of Temperature and Inorganic Mattersupporting

confidence: 90%

Influence of fast pyrolysis conditions on yield and structural transformation of biomass chars

Trubetskaya

Jensen

et al. 2015

Fuel Processing Technology

100

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Fast pyrolysis of biomass (wood, straw, rice husk) and its major components (cellulose, hemicellulose, lignin) was conducted in a wire mesh reactor. The aim of this study was to understand the influence of temperature (350-1400 ∘ C), heating rate (10-3000 ∘ C/s), particle size (0.05-2 mm) and holding time (1-4 s) on the char morphology and char yield. Scanning electron microscopy (SEM) and elemental analysis were conducted to determine the effect of operating conditions on char softening and melting during pyrolysis. The char yield decreased with heating rate for rates ≤600 ∘ C/s; above this value a similar biomass char yield was obtained. The potassium content affected the char yield stronger than other minerals, while the distribution of the three major biomass constituents (cellulose, hemicellulose, lignin) affected the char yield only to a minor degree. Moreover, it was found that the heat treatment temperature had a larger influence on the char yield than the heating rate. Scanning electron microscopy indicated different types of biomass char plasticization influenced by the applied temperatures, heating rates, particle sizes and holding times, except for the rice husk char that formed chars with a structure similar to the parental fuel at all conditions. The less severe morphological changes of rice husk char were attributed to a high silica content.

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Section: Effect Of Temperature and Inorganic Mattersupporting

confidence: 90%

Influence of fast pyrolysis conditions on yield and structural transformation of biomass chars

Trubetskaya

Jensen

et al. 2015

Fuel Processing Technology

100

View full text Add to dashboard Cite

show abstract

“…More important than temperature for C yields in bio-char was the type of biomass used for pyrolysis. Greater concentrations of lignin increased C recovery ( Figure 3) as well as did higher mineral content (Ravendraan et al 1995;Nik-Azar et al 1997). However, temperature affects yields and heating values of bio-oil, which are highest between 470 and 490…”

Section: Renewable Fuels From Biomass Energymentioning

confidence: 98%

Bio-char Sequestration in Terrestrial Ecosystems – A Review

Lehmann

Gaunt²,

Rondón

2006

Mitig Adapt Strat Glob Change

2,493

1,242

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Abstract. The application of bio-char (charcoal or biomass-derived black carbon (C)) to soil is proposed as a novel approach to establish a significant, long-term, sink for atmospheric carbon dioxide in terrestrial ecosystems. Apart from positive effects in both reducing emissions and increasing the sequestration of greenhouse gases, the production of bio-char and its application to soil will deliver immediate benefits through improved soil fertility and increased crop production. Conversion of biomass C to bio-char C leads to sequestration of about 50% of the initial C compared to the low amounts retained after burning (3%) and biological decomposition (<10-20% after 5-10 years), therefore yielding more stable soil C than burning or direct land application of biomass. This efficiency of C conversion of biomass to bio-char is highly dependent on the type of feedstock, but is not significantly affected by the pyrolysis temperature (within 350-500 • C common for pyrolysis). Existing slash-andburn systems cause significant degradation of soil and release of greenhouse gases and opportunies may exist to enhance this system by conversion to slash-and-char systems. Our global analysis revealed that up to 12% of the total anthropogenic C emissions by land use change (0.21 Pg C) can be off-set annually in soil, if slash-and-burn is replaced by slash-and-char. Agricultural and forestry wastes such as forest residues, mill residues, field crop residues, or urban wastes add a conservatively estimated 0.16 Pg C yr −1 . Biofuel production using modern biomass can produce a bio-char by-product through pyrolysis which results in 30.6 kg C sequestration for each GJ of energy produced. Using published projections of the use of renewable fuels in the year 2100, bio-char sequestration could amount to 5.5-9.5 Pg C yr −1 if this demand for energy was met through pyrolysis, which would exceed current emissions from fossil fuels (5.4 Pg C yr −1 ). Bio-char soil management systems can deliver tradable C emissions reduction, and C sequestered is easily accountable, and verifiable.

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“…TGA/SDTA 851e) and Flash-2000 Inter Science (CHN analyzer), respectively. The volatile and fixed carbon proximate analyses were analyzed adopting the method from [15]. The moisture and ash were determined, in a muffle furnace, according to ASTM D3173 and ASTM D3174-12, respectively.…”

Section: Proximate and Ultimate Analysismentioning

confidence: 99%

Experimental Study on Dry Torrefaction of Beech Wood and Miscanthus

et al. 2015

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Torrefaction is a thermochemical pre-treatment process for upgrading the properties of biomass to resemble those of fossil fuels such as coal. Biomass properties of particular interest are chemical composition, physical property and combustion characteristics. In this work, torrefaction of beech wood and miscanthus (sinensis) was carried out to study the influence of torrefaction temperature (240-300 °C) and residence time (15-150 min) on the aforementioned properties of the biomass. Results of the study revealed that torrefaction temperature has a significant influence on mass and energy yields, whereas the influence of the residence time becomes more apparent for the higher torrefaction temperatures (>280 °C). Torrefied miscanthus resulted in higher energy densification compared to beech wood for a residence time of 30 min. A significant improvement in grindability of the torrefied beech wood was obtained even for lightly torrefied beech wood (at 280 °C and 15 min of residence time). Observation from the combustion study showed that the ignition temperature is slightly affected by the torrefaction temperature. As a whole, the torrefaction temperature determines the characteristics of the torrefied fuel compared to other process parameters like residence time. Furthermore, with optimal process conditions, torrefaction produces a solid fuel with OPEN ACCESSEnergies 2015, 8 3904 combustion reactivity and porosity comparable to raw biomass, whereas grindability and heating value are comparable to low quality coal.

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Mineral matter effects in rapid pyrolysis of beech wood

Cited by 116 publications

References 14 publications

Influence of fast pyrolysis conditions on yield and structural transformation of biomass chars

Influence of fast pyrolysis conditions on yield and structural transformation of biomass chars

Bio-char Sequestration in Terrestrial Ecosystems – A Review

Experimental Study on Dry Torrefaction of Beech Wood and Miscanthus

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