Use of coffee (Coffea arabica) pulp for the production of briquettes and pellets for heat generation

Author:

Cubero-Abarca Robert1,Moya Roger1,Valaret Jorre2,Tomazello Filho Mario3

Affiliation:

1. Instituto Tecnológico de Costa Rica/TEC, Costa Rica

2. Agrep Forestal S. A., Costa Rica

3. Universidade de São Paulo/USP, Brasil

Abstract

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.

Publisher

FapUNIFESP (SciELO)

Subject

Soil Science,General Veterinary,Agronomy and Crop Science,Animal Science and Zoology,Food Science

Reference30 articles.

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3. D 5865-04 Standard test method for gross calorific value of coal and coke,2003

4. D-1102-84 Standart test method for ash in wood,2003

5. D 4442-92 Standard test methods for direct moisture content measurements of wood and wood-based materials,2003

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