TORREFIED BRIQUETTES OF SUGAR CANE BAGASSE AND EUCALYPTUS

Costa, Emylle Veloso Santos; Pereira, Matheus Perdigão de Castro Freitas; Silva, Carlos Miguel Simões da; Pereira, Bárbara Luísa Corradi; Rocha, Maria Fernanda Vieira; Carneiro, Angélica de Cássia Oliveira

doi:10.1590/1806-90882019000100001

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Article • Rev. Árvore 43 (1) • 2019 • https://doi.org/10.1590/1806-90882019000100001 copy

TORREFIED BRIQUETTES OF SUGAR CANE BAGASSE AND EUCALYPTUS

BRIQUETES TORRIFICADOS DE BAGAÇO DE CANA-DE-AÇÚCAR E EUCALIPTO

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Torrefaction and briquetting are two techniques that improve the quality of the biomass and facilitate direct use as fuel. The objective was to evaluate the effect of torrefaction temperature on the properties of the compound briquettes made from sugar cane bagasse and Eucalyptus sawdust. After sample preparation and particle analyses, briquettes were produced with the mixture of the two biomasses, a total of five compositions (0, 25, 50, 75 and 100%) at 120 °C and pressure of 1500 PSI. Subsequently, the briquettes were torrefied at temperatures of 180, 220 and 260 °C, for a period of 15 minutes. According to the results, both biomasses of Eucalyptus sawdust and sugar cane bagasse showed potential for the production of briquettes. The torrefaction reduced hygroscopicity and increased the calorific value of compound briquettes. The ideal composition for the production of briquettes is 100% Eucalyptus. The composition of 50% Eucalyptus + 50% sugar cane bagasse is also a great option, as some bagasse parameters were excellent. 260 °C was the best temperature to promote energy savings.

Keywords:
Biomass; Briquetting; Torrefaction

Table 1 Mean values of the properties of biomass sugar cane bagasse and Eucalyptus sawdust.

Parameters	Sugar cane bagasse	Eucalyptus sawdust
Content of volatiles (%)	86,25 a	86,50 a
Fixed carbon (%)	12,44 a	13,39 a
Ashes (%)	1,30 a	0,12 b
Hygroscopic equilibrium moisture (%)	6,83 b	10,09 a
Bulk density (kg.m^-3)	95,0 b	233,3 a
Gross calorific value (kcal.kg^-1)	4473 b	4659 a
Energetic density (GJ.m^-3)	1,27 b	3,26 a

Table 2 Mean values of the properties of the torrefied briquettes depending on the compositions of biomass and torrefaction temperature.

Parameters	Content of volatiles (%)	Fixed carbon (%)	Hygroscopic equilibrium moisture (%)	Apparent density (kg.m³)
Compositions	Content of volatiles (%)	Fixed carbon (%)	Hygroscopic equilibrium moisture (%)	Apparent density (kg.m³)
100% Eucalyptus	83,60 ab	16,33 a	7,59 a	1020 a
75% Eucalyptus + 25%Bagasse	84,75 a	14,95 b	6,90 b	1000 ab
50% Eucalyptus + 50%Bagasse	83,42 b	15,25 ab	7,10 ab	1020 a
25% Eucalyptus + 75%Bagasse	83,75 ab	14,45 bc	6,84 b	1000 ab
100% Bagasse	84,25 ab	13,39 c	6,52 b	960 b
Temperature (ºC)
Control	85,41 a	13,48 b	8,16 a	1050 a
180	85,43 a	13,42 b	8,11 a	1040 a
220	84,95 a	13,89 b	7,42 b	1000 b
260	80,02 b	18,70 a	4,27 c	930 c

Table 3 Mean values of the ashes content of the briquettes depending to the compositions.

Compositions	Ashes content (%)
100% Eucalyptus	0,45 d
75% Eucalyptus + 25% Bagasse	0,98 c
50% Eucalyptus + 50% Bagasse	1,08 c
25% Eucalyptus + 75% Bagasse	1,78 b
100% Bagasse	2,52 a

Table 4 Mean values of the gross calorific value (kcal kg-1) of the briquettes depending on the torrefaction temperature and compositions.

Compositions	Temperature (ºC)
	Control	180	220	260
100% Eucalyptus	4802 aB	4715 aB	4865 aAB	5003 aA
75% Eucalyptus + 25% Bagasse	4668 abB	4646 abB	4726 abB	4966 abA
50% Eucalyptus + 50% Bagasse	4624 bcB	4616 abB	4618 bB	4901 abA
25% Eucalyptus + 75% Bagasse	4549 bcB	4576 abB	4562 cB	4880 abA
100% Bagasse	4484 cB	4486 bB	4505 cB	4837 bA

Sociedade de Investigações Florestais Universidade Federal de Viçosa, CEP: 36570-900 - Viçosa - Minas Gerais - Brazil, Tel: (55 31) 3612-3959 - Viçosa - MG - Brazil
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