SciELO - Scientific Electronic Library Online

 
vol.38 número5Variabilidade espacial de poros em Latossolo oxídico sob sistema de manejo conservacionista com diferentes doses de gessoRetenção de água e índice S de um Latossolo Vermelho-Amarelo submetido a métodos de controle de plantas invasoras na cultura do café índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Ciência e Agrotecnologia

versão impressa ISSN 1413-7054

Resumo

CUBERO-ABARCA, Robert; MOYA, Roger; VALARET, Jorre  e  TOMAZELLO FILHO, Mario. Use of coffee (Coffea arabica) pulp for the production of briquettes and pellets for heat generation. Ciênc. agrotec. [online]. 2014, vol.38, n.5, pp.461-470. ISSN 1413-7054.  https://doi.org/10.1590/S1413-70542014000500005.

Coffee bean (Coffea arabica) processing generates high amount of residues that are sources of environmental pollution. Therefore, an appropriate solution is needed. The objective of this study was to determine the potential of coffee pulp to produce briquettes and pellets. The study included pulp drying (using air, solar and hot air methods); the production of briquettes and pellets; the evaluation of their energy, physical and mechanical properties; and the evaluation of pellet quality using X-ray densitometry. The results showed that the pulp presented an initial moisture content of 90%, resulting in drying times of 699, 308 and 55 hours for air, solar and hot air drying, respectively, and the calorific values of the pellets and briquettes were 12,501 kJ kg-1 and 11,591 kJ kg-1, respectively. The ash content was 8.68% for the briquettes and 6.74% for the pellets. The density of the briquettes was 1,110 kg m-3, compared with 1,300 kg m-3 for the pellets. The apparent densities were 1,000 kg m-3 and 600 kg m-3 for the briquettes and pellets, respectively, and the water absorptions by the briquettes were 7.90% and 8.10% by the pellets. The maximum horizontal compression effort was 26.86 kg cm-2, measured in the pellets, compared with 4.52 kg cm-2 in the briquettes. The maximum horizontal load was 93.24 kg, measured in the briquettes, compared with 33.50 kg in the pellets. The value of the pellet durability test was 75.54%. X-ray densitometry showed that the pellet was uniform and a few cracks were observed on the pellet surface.

Palavras-chave : Coffee residues; drying; coffee processing; biomass; bio-resources.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons