Spruce and Barley Elemental and Stochiometric Analysis Affected by the Impact of Pellet Production and Torrefaction

Jeníček, Lukáš; Neškudla, Michal; Malaťák, Jan; Velebil, Jan; Passian, Luboš

doi:10.2478/ata-2021-0028

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…Very similar numbers are seen also on the Figure 7 showing the theoretical volumetric combustion. These results are consistent with Tamelová [ 24 ] and Jeníček [ 73 ], where a higher torrefaction temperature reduced the fraction of CO 2 concentration in the flue gas.…”

Section: Resultssupporting

confidence: 90%

Use of Spent Coffee Ground as an Alternative Fuel and Possible Soil Amendment

et al. 2022

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Spent coffee ground is a massively produced coffee industry waste product whose reusage is beneficial. Proximate and ultimate and stochiometric analysis of torrefied spent coffee ground were performed and results were analyzed and compared with other research and materials. Spent coffee ground is a material with high content of carbon (above 50%) and therefore high calorific value (above 20 MJ·kg−1). Torrefaction improves the properties of the material, raising its calorific value up to 32 MJ·kg−1. Next, the phytotoxicity of the aqueous extract was tested using the cress test. The non-torrefied sample and the sample treated at 250 °C were the most toxic. The sample treated at 250 °C adversely affected the germination of the cress seeds due to residual caffeine, tannins and sulfur release. The sample treated at 350 °C performed best of all the tested samples. The sample treated at 350 °C can be applied to the soil as the germination index was higher than 50% and can be used as an alternative fuel with net calorific value comparable to fossil fuels.

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Section: Resultssupporting

confidence: 90%

Use of Spent Coffee Ground as an Alternative Fuel and Possible Soil Amendment

et al. 2022

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“…Exceeding these temperature does not result in a considerable oxygen content reduction and lower dry mass yield (Figure 1), while increasing the yields of gaseous and liquid products [59,60]. The total dry mass yield at this threshold, i.e., at 350 • C, was 38.4%, with a net calorific value of 27.87 MJ kg −1 , a result observed for other woody biomasses by Ingram et al [61] or Jeníček et al [62].…”

Section: Quality Parameters Of the Solid Torrefaction Productssupporting

confidence: 50%

Substituting Solid Fossil Fuels with Torrefied Timber Products

Malaťák,

Jankovský,

Malaťáková

et al. 2023

Materials

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As a push towards alternative and renewable resources for heat and power generation, biomass and thermally treated fuels from biomass may be viable options in the upcoming economic reality. This study the verified mass and energy balance of spruce woody biomass after low temperature pyrolysis between 250 and 550 °C. The results showed that low-temperature pyrolysis can yield high-grade biochar suitable for substitution of fossil fuels. Crucially, the net calorific value of biochar processed at 350 °C substantially exceeded that of brown coal. An economic analysis was carried out on the assumption of the current economic reality in the Czech Republic. It was shown that even if the price of the biochar slightly increased, it would still be beneficial to invest in torrefaction technology over paying carbon credits.

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“…These differences between samples are most pronounced in WT-30-275, where the differences were over twenty percent, again with the exception of volume of water vapour. Similar results were described by Jeníček et al [ 59 ] for torrefied spruce and barley mixtures.…”

Section: Resultssupporting

confidence: 91%

Impact of Torrefaction on Fuel Properties of Aspiration Cleaning Residues

et al. 2022

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To maximise the use of biomass for energy purposes, there are various options for converting biomass to biofuels through thermochemical conversion processes, one of which is torrefaction. Higher utilisation of waste from the aspiration cleaning of grains, such as wheat or maize, could be one of the means through which the dependence on fossil fuels could be reduced in the spirit of a circular economy. In this study, the effect of torrefaction on fuel properties of agricultural residues was investigated. The tested materials were waste by-products from the aspiration cleaning of maize grains and waste from wheat. The materials were treated by torrefaction under a nitrogen atmosphere (225 °C, 250 °C, and 275 °C), over a residence time of 30 min. During the treatment, weight loss was monitored as a function of time. Proximate and elemental composition, as well as calorific values, were analysed before and after torrefaction. Torrefaction has a positive effect on the properties of the fuels in the samples studied, as shown by the results. The carbon content increased the most between temperatures of 250 °C and 275 °C, i.e., by 11.7% wt. in waste from maize. The oxygen content in the maize waste samples decreased by 38.99% wt. after torrefaction, and in wheat waste, it decreased by 37.20% wt. compared to the original. The net calorific value increased with increasing temperatures of process and reached a value of 23.56 MJ·kg−1 at a peak temperature of 275 °C in by-products from maize. To express the influence of the treatments on combustion behaviour, stoichiometric combustion calculations were performed. Differences of up to 20% in stoichiometric combustion parameters were found between the two types of waste. A similar case was found for fuel consumption, where a difference of 19% was achieved for torrefaction at a temperature of 275 °C, which fundamentally differentiated these fuels.

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Spruce and Barley Elemental and Stochiometric Analysis Affected by the Impact of Pellet Production and Torrefaction

Cited by 7 publications

References 18 publications

Use of Spent Coffee Ground as an Alternative Fuel and Possible Soil Amendment

Use of Spent Coffee Ground as an Alternative Fuel and Possible Soil Amendment

Substituting Solid Fossil Fuels with Torrefied Timber Products

Impact of Torrefaction on Fuel Properties of Aspiration Cleaning Residues

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