Influence of torrefaсtion on the characteristics of fuel blends of biomass and high-ash carbon-containing waste

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Resumo

The influence of torrefaction on the characteristics of binary fuel blends consisting of plant biomass and high-ash carbon-containing technogenic waste is considered. It has been shown that through torrefaction it is possible to compensate for the decrease in the heating value of fuel blends associated with the addition of a high-ash component. A criterion for choosing a torrefaction mode is proposed and the corresponding analytical expression is obtained that allows one to calculate the minimum permissible biomass content in the fuel blend. This expression can be used in relation to fuel blends of various types of plant biomass and high-ash carbon-containing waste. There are presented quantitative data demonstrating the improvement of the hydrophobic properties of fuel blends as a result of torrefaction.

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Sobre autores

Ya. Pudova

Joint Institute for High Temperatures of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: pudova.y.d@mail.ru
Rússia, Moscow, 125412

V. Sinelshchikov

Joint Institute for High Temperatures of the Russian Academy of Sciences

Email: sinelshchikov@mail.ru
Rússia, Moscow, 125412

G. Sytchev

Joint Institute for High Temperatures of the Russian Academy of Sciences

Email: george.sytchev@yandex.ru
Rússia, Moscow, 125412

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2. Fig. 1. DTG dependences for initial raw materials in a nitrogen flow: DO – 1, LP – 2, ZSHO – 3, UK – 4.

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3. Fig. 2. Dependence of the combustion heat of the original (1, 5, 6) and torrefied at different temperatures (240°C – 2, 270°C – 3, 300°C – 4) pellets from DO-ZSHO and DO-UK mixtures on their composition before torrefaction: 1–4 – calculation using Mendeleyev’s formula based on the results of elemental analysis; 5, 6 – results of calorimetric measurements.

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4. Fig. 3. Dependence of the combustion heat of the original (1) and torrefied at different temperatures (240°C – 2, 270°C – 3, 300°C – 4) pellets from LP-ZSHO and LP-UK mixtures on their composition before torrefaction.

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5. Fig. 4. Dependence of the relative heat of combustion of torrefied biomass on the value of mass losses during torrefaction calculated on a dry basis: DO – wood sawdust, LP – sunflower husk, SP – straw pellets.

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6. Fig. 5. The minimum proportion of biomass in the initial mixture that satisfies criterion (3), depending on the proportion of mass losses during torrefaction and the ratio of the heat of combustion of carbon-containing waste to the heat of combustion of biomass.

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7. Fig. 6. The hygroscopicity conversion of the original and torrefied pellets at different temperatures from DO-ZSHO and DO-UK mixtures depending on the content of carbon-containing waste in the original mixture.

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8. Fig. 7. The hygroscopicity conversion of the original and torrefied pellets at different temperatures from LP-ZSHO and LP-UK mixtures depending on the content of carbon-containing waste in the original mixture.

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